1 News for the tz database
3 Release 2020d - 2020-10-21 11:24:13 -0700
6 Palestine ends DST earlier than predicted, on 2020-10-24.
8 Changes to past and future timestamps
10 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31
11 as previously predicted (thanks to Sharef Mustafa.) Its
12 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen
13 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and
14 its spring 2020 transition was on March 28 at 00:00, not March 27
15 (thanks to Pierre Cashon.) This affects Asia/Gaza and
16 Asia/Hebron. Assume future spring and fall transitions will be on
17 the Saturday preceding the last Sunday of March and October,
21 Release 2020c - 2020-10-16 11:15:53 -0700
24 Fiji starts DST later than usual, on 2020-12-20.
26 Changes to future timestamps
28 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as
29 previously predicted. DST will still end on 2021-01-17.
30 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that
31 the later-than-usual start date is a one-time departure from the
34 Changes to build procedure
36 Rearguard tarballs now contain an empty file pacificnew.
37 Some older downstream software expects this file to exist.
38 (Problem reported by Mike Cullinan.)
41 Release 2020b - 2020-10-06 18:35:04 -0700
44 Revised predictions for Morocco's changes starting in 2023.
45 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
46 Macquarie Island has stayed in sync with Tasmania since 2011.
47 Casey, Antarctica is at +08 in winter and +11 in summer.
48 zic no longer supports -y, nor the TYPE field of Rules.
50 Changes to future timestamps
52 Morocco's spring-forward after Ramadan is now predicted to occur
53 no sooner than two days after Ramadan, instead of one day.
54 (Thanks to Milamber.) The first altered prediction is for 2023,
55 now predicted to spring-forward on April 30 instead of April 23.
57 Changes to past and future timestamps
59 Casey Station, Antarctica has been using +08 in winter and +11 in
60 summer since 2018. The most recent transition from +08 to +11 was
61 2020-10-04 00:01. Also, Macquarie Island has been staying in
62 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.)
64 Changes to past and future time zone abbreviations and DST flags
66 Canada's Yukon, represented by America/Whitehorse and
67 America/Dawson, changes its time zone rules from -08/-07 to
68 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it.
69 This change affects only the time zone abbreviation (MST vs PDT)
70 and daylight saving flag for the period between the two dates.
71 (Thanks to Andrew G. Smith.)
73 Changes to past timestamps
75 Correct several transitions for Hungary for 1918/1983.
76 For example, the 1983-09-25 fall-back was at 01:00, not 03:00.
77 (Thanks to Géza Nyáry.) Also, the 1890 transition to standard
78 time was on 11-01, not 10-01 (thanks to Michael Deckers).
80 The 1891 French transition was on March 16, not March 15. The
81 1911-03-11 French transition was at midnight, not a minute later.
82 Monaco's transitions were on 1892-06-01 and 1911-03-29, not
83 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.)
87 Support for zic's long-obsolete '-y YEARISTYPE' option has been
88 removed and, with it, so has support for the TYPE field in Rule
89 lines, which is now reserved for compatibility with earlier zic.
90 These features were previously deprecated in release 2015f.
91 (Thanks to Tim Parenti.)
93 zic now defaults to '-b slim' instead of to '-b fat'.
95 zic's new '-l -' and '-p -' options uninstall any existing
96 localtime and posixrules files, respectively.
98 The undocumented and ineffective tzsetwall function has been
101 Changes to build procedure
103 The Makefile now defaults POSIXRULES to '-', so the posixrules
104 feature (obsolete as of 2019b) is no longer installed by default.
106 Changes to documentation and commentary
108 The long-obsolete files pacificnew, systemv, and yearistype.sh have
109 been removed from the distribution. (Thanks to Tim Parenti.)
112 Release 2020a - 2020-04-23 16:03:47 -0700
115 Morocco springs forward on 2020-05-31, not 2020-05-24.
116 Canada's Yukon advanced to -07 year-round on 2020-03-08.
117 America/Nuuk renamed from America/Godthab.
118 zic now supports expiration dates for leap second lists.
120 Changes to future timestamps
122 Morocco's second spring-forward transition in 2020 will be May 31,
123 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.)
124 Adjust future-year predictions to use the first Sunday after the
125 day after Ramadan, not the first Sunday after Ramadan.
127 Canada's Yukon, represented by America/Whitehorse and
128 America/Dawson, advanced to -07 year-round, beginning with its
129 spring-forward transition on 2020-03-08, and will not fall back on
130 2020-11-01. Although a government press release calls this
131 "permanent Pacific Daylight Saving Time", we prefer MST for
132 consistency with nearby Dawson Creek, Creston, and Fort Nelson.
133 (Thanks to Tim Parenti.)
135 Changes to past timestamps
137 Shanghai observed DST in 1919. (Thanks to Phake Nick.)
139 Changes to timezone identifiers
141 To reflect current usage in English better, America/Godthab has
142 been renamed to America/Nuuk. A backwards-compatibility link
143 remains for the old name.
147 localtime.c no longer mishandles timestamps after the last
148 transition in a TZif file with leap seconds and with daylight
149 saving time transitions projected into the indefinite future.
150 For example, with TZ='America/Los_Angeles' with leap seconds,
151 zdump formerly reported a DST transition on 2038-03-14
152 from 01:59:32.999... to 02:59:33 instead of the correct transition
153 from 01:59:59.999... to 03:00:00.
155 zic -L now supports an Expires line in the leapseconds file, and
156 truncates the TZif output accordingly. This propagates leap
157 second expiration information into the TZif file, and avoids the
158 abovementioned localtime.c bug as well as similar bugs present in
159 many client implementations. If no Expires line is present, zic
160 -L instead truncates the TZif output based on the #expires comment
161 present in leapseconds files distributed by tzdb 2018f and later;
162 however, this usage is obsolescent. For now, the distributed
163 leapseconds file has an Expires line that is commented out, so
164 that the file can be fed to older versions of zic which ignore the
165 commented-out line. Future tzdb distributions are planned to
166 contain a leapseconds file with an Expires line.
168 The configuration macros HAVE_TZNAME and USG_COMPAT should now be
169 set to 1 if the system library supports the feature, and 2 if not.
170 As before, these macros are nonzero if tzcode should support the
171 feature, zero otherwise.
173 The configuration macro ALTZONE now has the same values with the
174 same meaning as HAVE_TZNAME and USG_COMPAT.
176 The code's defense against CRLF in leap-seconds.list is now
177 portable to POSIX awk. (Problem reported by Deborah Goldsmith.)
179 Although the undocumented tzsetwall function is not changed in
180 this release, it is now deprecated in preparation for removal in
181 future releases. Due to POSIX requirements, tzsetwall has not
182 worked for some time. Any code that uses it should instead use
183 tzalloc(NULL) or, if portability trumps thread-safety, should
184 unset the TZ environment variable.
186 Changes to commentary
188 The Îles-de-la-Madeleine and the Listuguj reserve are noted as
189 following America/Halifax, and comments about Yukon's "south" and
190 "north" have been corrected to say "east" and "west". (Thanks to
194 Release 2019c - 2019-09-11 08:59:48 -0700
197 Fiji observes DST from 2019-11-10 to 2020-01-12.
198 Norfolk Island starts observing Australian-style DST.
200 Changes to future timestamps
202 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12
203 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.)
204 Adjust future guesses accordingly.
206 Norfolk Island will observe Australian-style DST starting in
207 spring 2019. The first transition is on 2019-10-06. (Thanks to
208 Kyle Czech and Michael Deckers.)
210 Changes to past timestamps
212 Many corrections to time in Turkey from 1940 through 1985.
213 (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.)
215 The Norfolk Island 1975-03-02 transition was at 02:00 standard
216 time, not 02:00 DST. (Thanks to Michael Deckers.)
218 South Korea observed DST from 1948 through 1951. Although this
219 info was supposed to appear in release 2014j, a typo inadvertently
220 suppressed the change. (Thanks to Alois Treindl.)
222 Detroit observed DST in 1967 and 1968 following the US DST rules,
223 except that its 1967 DST began on June 14 at 00:01. (Thanks to
224 Alois Treindl for pointing out that the old data entries were
227 Fix several errors in pre-1970 transitions in Perry County, IN.
228 (Thanks to Alois Triendl for pointing out the 1967/9 errors.)
230 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver
231 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not
232 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02
233 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated
234 EET/EEST, not CET/CEST. (Thanks to Alois Triendl.) In 1946
235 Königsberg switched to +03 on 04-07 not 01-01.
237 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not
238 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.)
239 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27.
241 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon.
242 (Thanks to Michael Deckers.)
244 Changes to past time zone abbreviations and DST flags
246 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25,
247 is now flagged as DST and is abbreviated HKWT not HKT.
251 leapseconds.awk now relies only on its input data, rather than
252 also relying on its comments. (Inspired by code from Dennis
253 Ferguson and Chris Woodbury.)
255 The code now defends against CRLFs in leap-seconds.list.
256 (Thanks to Brian Inglis and Chris Woodbury.)
258 Changes to documentation and commentary
260 theory.html discusses leap seconds. (Thanks to Steve Summit.)
262 Nashville's newspapers dueled about the time of day in the 1950s.
263 (Thanks to John Seigenthaler.)
265 Liechtenstein observed Swiss DST in 1941/2.
266 (Thanks to Alois Treindl.)
269 Release 2019b - 2019-07-01 00:09:53 -0700
272 Brazil no longer observes DST.
273 'zic -b slim' outputs smaller TZif files; please try it out.
274 Palestine's 2019 spring-forward transition was on 03-29, not 03-30.
276 Changes to future timestamps
278 Brazil has canceled DST and will stay on standard time indefinitely.
279 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de
282 Predictions for Morocco now go through 2087 instead of 2037, to
283 work around a problem on newlib when using TZif files output by
284 zic 2019a or earlier. (Problem reported by David Gauchard.)
286 Changes to past and future timestamps
288 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30
289 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess
290 future transitions to be March's last Friday at 00:00.
292 Changes to past timestamps
294 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not
295 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00,
296 not 09-15 at 00:00. In 1946 its spring-forward transition was on
297 04-21 at 00:00, not the previous day at 03:30. From 1946 through
298 1952 its fall-back transitions occurred at 04:30, not at 03:30.
299 In 1947 its fall-back transition was on 11-30, not 12-30.
302 Changes to past time zone abbreviations
304 Italy's 1866 transition to Rome Mean Time was on December 12, not
305 September 22. This affects only the time zone abbreviation for
306 Europe/Rome between those dates. (Thanks to Stephen Trainor and
309 Changes affecting metadata only
311 Add info about the Crimea situation in zone1970.tab and zone.tab.
312 (Problem reported by Serhii Demediuk.)
316 zic's new -b option supports a way to control data bloat and to
317 test for year-2038 bugs in software that reads TZif files.
318 'zic -b fat' and 'zic -b slim' generate larger and smaller output;
319 for example, changing from fat to slim shrinks the Europe/London
320 file from 3648 to 1599 bytes, saving about 56%. Fat and slim
321 files represent the same set of timestamps and use the same TZif
322 format as documented in tzfile(5) and in Internet RFC 8536.
323 Fat format attempts to work around bugs or incompatibilities in
324 older software, notably software that mishandles 64-bit TZif data
325 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules.
326 Slim format is more efficient and does not work around 64-bit bugs
327 or obsolete TZ strings. Currently zic defaults to fat format
328 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this
329 out-of-the-box default is intended to change in future releases
330 as the buggy software often mishandles timestamps anyway.
332 zic no longer treats a set of rules ending in 2037 specially.
333 Previously, zic assumed that such a ruleset meant that future
334 timestamps could not be predicted, and therefore omitted a
335 POSIX-like TZ string in the TZif output. The old behavior is no
336 longer needed for current tzdata, and caused problems with newlib
337 when used with older tzdata (reported by David Gauchard).
339 zic no longer generates some artifact transitions. For example,
340 Europe/London no longer has a no-op transition in January 1996.
342 Changes to build procedure
344 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi
347 Changes to documentation and commentary
349 The Makefile now documents the POSIXRULES macro as being obsolete,
350 and similarly, zic's -p POSIXRULES option is now documented as
351 being obsolete. Although the POSIXRULES feature still exists and
352 works as before, in practice it is rarely used for its intended
353 purpose, and it does not work either in the default reference
354 implementation (for timestamps after 2037) or in common
355 implementations such as GNU/Linux (for contemporary timestamps).
356 Since POSIXRULES was designed primarily as a temporary transition
357 facility for System V platforms that died off decades ago, it is
358 being decommissioned rather than institutionalized.
360 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick).
363 Release 2019a - 2019-03-25 22:01:33 -0700
366 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23.
367 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00.
369 Changes to past and future timestamps
371 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
372 previously predicted. Adjust our prediction by guessing that spring
373 transitions will be between 24 and 30 March, which matches recent practice
374 since 2016. (Thanks to Even Scharning and Tim Parenti.)
376 Metlakatla ended its observance of Pacific standard time,
377 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan
378 Stanley and Tim Parenti.)
380 Changes to past timestamps
382 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25).
383 (Thanks to Alois Treindl and Isaac Starkman.)
385 Changes to time zone abbreviations
387 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead
388 of being a separate zone that generates the abbreviation "UCT",
389 which nowadays is typically a typo. (Problem reported by Isiah
394 zic now has an -r option to limit the time range of output data.
395 For example, 'zic -r @1000000000' limits the output data to
396 timestamps starting 1000000000 seconds after the Epoch.
397 This helps shrink output size and can be useful for applications
398 not needing the full timestamp history, such as TZDIST truncation;
399 see Internet RFC 8536 section 5.1. (Inspired by a feature request
400 from Christopher Wong, helped along by bug reports from Wong and
403 Changes to documentation
405 Mention Internet RFC 8536 (February 2019), which documents TZif.
407 tz-link.html now cites tzdata-meta
408 <https://tzdata-meta.timtimeonline.com/>.
411 Release 2018i - 2018-12-30 11:05:43 -0800
414 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
416 Changes to future timestamps
418 Due to a change in government, São Tomé and Príncipe switches back
419 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim
420 Nasardinov and Michael Deckers.)
423 Release 2018h - 2018-12-23 17:59:32 -0800
426 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
427 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
428 Metlakatla, Alaska observes PST this winter only.
429 Guess Morocco will continue to adjust clocks around Ramadan.
430 Add predictions for Iran from 2038 through 2090.
432 Changes to future timestamps
434 Guess that Morocco will continue to fall back just before and
435 spring forward just after Ramadan, the practice since 2012.
436 (Thanks to Maamar Abdelkader.) This means Morocco will observe
437 negative DST during Ramadan in main and vanguard formats, and in
438 rearguard format it stays in the +00 timezone and observes
439 ordinary DST in all months other than Ramadan. As before, extend
440 this guesswork to the year 2037. As a consequence, Morocco is
441 scheduled to observe three DST transitions in some Gregorian years
442 (e.g., 2033) due to the mismatch between the Gregorian and Islamic
445 The table of exact transitions for Iranian DST has been extended.
446 It formerly cut off before the year 2038 in a nod to 32-bit time_t.
447 It now cuts off before 2091 as there is doubt about how the Persian
448 calendar will treat 2091. This change predicts DST transitions in
449 2038-9, 2042-3, and 2046-7 to occur one day later than previously
450 predicted. As before, post-cutoff transitions are approximated.
452 Changes to past and future timestamps
454 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to
455 +05 on 2018-12-21. This is a zone split as Qostanay (aka
456 Kostanay) did not switch, so create a zone Asia/Qostanay.
458 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04.
459 It did not change clocks that day and remains on -08 this winter.
460 (Thanks to Ryan Stanley.) It will revert to the usual Alaska
461 rules next spring, so this change affects only timestamps
462 from 2018-11-04 through 2019-03-10.
464 Change to past timestamps
466 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00,
467 not 00:00. I transcribed the time incorrectly from Shanks.
468 (Thanks to Phake Nick.)
470 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00.
471 (Thanks to Phake Nick.)
473 Guam observed DST irregularly from 1959 through 1977.
474 (Thanks to Phake Nick.)
476 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on
477 10-01 changed standard time to +08:30 (not +08). Its transition
478 back to +08 after WWII was on 1945-09-15, not the previous day.
479 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT).
480 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also,
481 its 1952 fallback was on 11-02 (not 10-25).
483 This release contains many changes to timestamps before 1946 due
484 to Japanese possession or occupation of Pacific/Chuuk,
485 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro,
486 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei.
487 (Thanks to Phake Nick.)
489 Assume that the Spanish East Indies was like the Philippines and
490 observed American time until the end of 1844. This affects
491 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei.
493 Changes to past tm_isdst flags
495 For the recent Morocco change, the tm_isdst flag should be 1 from
496 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.)
497 Give a URL to the official decree. (Thanks to Matt Johnson.)
500 Release 2018g - 2018-10-26 22:22:45 -0700
503 Morocco switches to permanent +01 on 2018-10-28.
505 Changes to future timestamps
507 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28,
508 so its clocks will not fall back as previously scheduled.
509 (Thanks to Mohamed Essedik Najd and Brian Inglis.)
513 When generating TZif files with leap seconds, zic no longer uses a
514 format that trips up older 32-bit clients, fixing a bug introduced
515 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround
516 for QTBUG-53071 now also works for TZif files with leap seconds.
518 The translator to rearguard format now rewrites the line
519 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
520 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S".
521 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
522 and earlier. (Reported by Christos Zoulas.)
524 Changes to past time zone abbreviations
526 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
527 This reverts to 2011h, as the abbreviation change in 2011i was
530 Changes to documentation
532 tzfile.5 has new sections on interoperability issues.
535 Release 2018f - 2018-10-18 00:14:18 -0700
538 Volgograd moves from +03 to +04 on 2018-10-28.
539 Fiji ends DST 2019-01-13, not 2019-01-20.
540 Most of Chile changes DST dates, effective 2019-04-06.
542 Changes to future timestamps
544 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
545 (Thanks to Alexander Fetisov and Stepan Golosunov.)
547 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
548 predicted. (Thanks to Raymond Kumar.) Adjust future predictions
551 Most of Chile will end DST on the first Saturday in April at 24:00 mainland
552 time, and resume DST on the first Saturday in September at 24:00 mainland
553 time. The changes are effective from 2019-04-06, and do not affect the
554 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa
555 and Tim Parenti.) Adjust future predictions accordingly.
557 Changes to past timestamps
559 The 2018-05-05 North Korea 30-minute time zone change took place
560 at 23:30 the previous day, not at 00:00 that day.
562 China's 1988 spring-forward transition was on April 17, not
563 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00.
566 Fix several issues for Macau before 1992. Macau's pre-1904 LMT
567 was off by 10 s. Macau switched to +08 in 1904 not 1912, and
568 temporarily switched to +09/+10 during World War II. Macau
569 observed DST in 1942/79, not 1961/80, and there were several
570 errors for transition times and dates. (Thanks to P Chan.)
572 The 1948-1951 fallback transitions in Japan were at 25:00 on
573 September's second Saturday, not at 24:00. (Thanks to Phake Nick.)
574 zic turns this into 01:00 on the day after September's second
575 Saturday, which is the best that POSIX or C platforms can do.
577 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
578 paper by Li Yu, replacing more-questionable data from Shanks.
580 Changes to time zone abbreviations
582 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.)
586 zic now always generates TZif files where time type 0 is used for
587 timestamps before the first transition. This simplifies the
588 reading of TZif files and should not affect behavior of existing
589 TZif readers because the same set of time types is used; only
590 their internal indexes may have changed. This affects only the
591 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
592 EET, which previously used nonzero types for these timestamps.
594 Because of the type 0 change, zic no longer outputs a dummy
595 transition at time -2**59 (before the Big Bang), as clients should
596 no longer need this to handle historical timestamps correctly.
597 This reverts a change introduced in 2013d and shrinks most TZif
598 files by a few bytes.
600 zic now supports negative time-of-day in Rule and Leap lines, e.g.,
601 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
602 occurs at 18:00 on the Saturday before the last Sunday in April.
603 This behavior was documented in 2018a but the code did not
604 entirely match the documentation.
606 localtime.c no longer requires at least one time type in TZif
607 files that lack transitions or have a POSIX-style TZ string. This
608 future-proofs the code against possible future extensions to the
609 format that would allow TZif files with POSIX-style TZ strings and
610 without transitions or time types.
612 A read-access subscript error in localtime.c has been fixed.
613 It could occur only in TZif files with timecnt == 0, something that
614 does not happen in practice now but could happen in future versions.
616 localtime.c no longer ignores TZif POSIX-style TZ strings that
617 specify only standard time. Instead, these TZ strings now
618 override the default time type for timestamps after the last
619 transition (or for all timestamps if there are no transitions),
620 just as DST strings specifying DST have always done.
622 leapseconds.awk now outputs "#updated" and "#expires" comments,
623 and supports leap seconds at the ends of months other than June
624 and December. (Inspired by suggestions from Chris Woodbury.)
626 Changes to documentation
628 New restrictions: A Rule name must start with a character that
629 is neither an ASCII digit nor "-" nor "+", and an unquoted name
630 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
631 The latter restriction makes room for future extensions (a
632 possibility noted by Tom Lane).
634 tzfile.5 now documents what time types apply before the first and
635 after the last transition, if any.
637 Documentation now uses the spelling "timezone" for a TZ setting
638 that determines timestamp history, and "time zone" for a
639 geographic region currently sharing the same standard time.
641 The name "TZif" is now used for the tz binary data format.
643 tz-link.htm now mentions the A0 TimeZone Migration utilities.
644 (Thanks to Aldrin Martoq for the link.)
646 Changes to build procedure
648 New 'make' target 'rearguard_tarballs' to build the rearguard
649 tarball only. This is a convenience on platforms that lack lzip
650 if you want to build the rearguard tarball. (Problem reported by
653 tzdata.zi is now more stable from release to release. (Problem
654 noted by Tom Lane.) It is also a bit shorter.
656 tzdata.zi now can contain comment lines documenting configuration
657 information, such as which data format was selected, which input
658 files were used, and how leap seconds are treated. (Problems
659 noted by Lester Caine and Brian Inglis.) If the Makefile defaults
660 are used these comment lines are absent, for backward
661 compatibility. A redistributor intending to alter its copy of the
662 files should also append "-LABEL" to the 'version' file's first
663 line, where "LABEL" identifies the redistributor's change.
666 Release 2018e - 2018-05-01 23:42:51 -0700
670 North Korea switches back to +09 on 2018-05-05.
671 The main format uses negative DST again, for Ireland etc.
672 'make tarballs' now also builds a rearguard tarball.
673 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
675 Changes to past and future timestamps
677 North Korea switches back from +0830 to +09 on 2018-05-05.
678 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
681 Bring back the negative-DST changes of 2018a, except be more
682 compatible with data parsers that do not support negative DST.
683 Also, this now affects historical timestamps in Namibia and the
684 former Czechoslovakia, not just Ireland. The main format now uses
685 negative DST to model timestamps in Europe/Dublin (from 1971 on),
686 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
687 does not affect UT offsets, only time zone abbreviations and the
688 tm_isdst flag. Also, this does not affect rearguard or vanguard
689 formats; effectively the main format now uses vanguard instead of
690 rearguard format. Data parsers that do not support negative DST
691 can still use data from the rearguard tarball described below.
693 Changes to build procedure
695 The command 'make tarballs' now also builds the tarball
696 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
697 except that it uses rearguard format intended for trailing-edge
700 Changes to data format and to code
702 The SAVE column of Rule and Zone lines can now have an 's' or 'd'
703 suffix, which specifies whether the adjusted time is standard time
704 or daylight saving time. If no suffix is given, daylight saving
705 time is used if and only if the SAVE column is nonzero; this is
706 the longstanding behavior. Although this new feature is not used
707 in tzdata, it could be used to specify the legal time in Namibia
708 1994-2017, as opposed to the popular time (see below).
710 Changes to past timestamps
712 From 1994 through 2017 Namibia observed DST in winter, not summer.
713 That is, it used negative DST, as Ireland still does. This change
714 does not affect UTC offsets; it affects only the tm_isdst flag and
715 the abbreviation used during summer, which is now CAT, not WAST.
716 Although (as noted by Michael Deckers) summer and winter time were
717 both simply called "standard time" in Namibian law, in common
718 practice winter time was considered to be DST (as noted by Stephen
719 Colebourne). The full effect of this change is only in vanguard
720 and main format; in rearguard format, the tm_isdst flag is still
721 zero in winter and nonzero in summer.
723 In 1946/7 Czechoslovakia also observed negative DST in winter.
724 The full effect of this change is only in vanguard and main
725 formats; in rearguard format, it is modeled as plain GMT without
726 daylight saving. Also, the dates of some 1944/5 DST transitions
727 in Czechoslovakia have been changed.
730 Release 2018d - 2018-03-22 07:05:46 -0700
734 Palestine starts DST a week earlier in 2018.
735 Add support for vanguard and rearguard data consumers.
736 Add subsecond precision to source data format, though not to data.
738 Changes to future timestamps
740 In 2018, Palestine starts DST on March 24, not March 31.
741 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
743 Changes to past and future timestamps
745 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
746 at 04:00. (Thanks to Steffen Thorsen.)
748 Changes to past timestamps
750 Historical transitions for Uruguay, represented by
751 America/Montevideo, have been updated per official legal documents,
752 replacing previous data mainly originating from the inventions of
753 Shanks & Pottenger. This has resulted in adjustments ranging from
754 30 to 90 minutes in either direction over at least two dozen
755 distinct periods ranging from one day to several years in length.
756 A mere handful of pre-1991 transitions are unaffected; data since
757 then has come from more reliable contemporaneous reporting. These
758 changes affect various timestamps in 1920-1923, 1936, 1939,
759 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
760 Additionally, Uruguay's pre-standard-time UT offset has been
761 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
762 match the location of the Observatory of the National Meteorological
763 Institute in Montevideo.
764 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
766 Enderbury and Kiritimati skipped New Year's Eve 1994, not
767 New Year's Day 1995. (Thanks to Kerry Shetline.)
769 Fix the 1912-01-01 transition for Portugal and its colonies.
770 This transition was at 00:00 according to the new UT offset, not
771 according to the old one. Also assume that Cape Verde switched on
772 the same date as the rest, not in 1907. This affects
773 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
774 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
775 (Thanks to Michael Deckers.)
777 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
780 Changes to past time zone abbreviations
782 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There
783 is no clock change associated with the transition.
785 Changes to build procedure
787 The new DATAFORM macro in the Makefile lets the installer choose
788 among three source data formats. The idea is to lessen downstream
789 disruption when data formats are improved.
791 * DATAFORM=vanguard installs from the latest, bleeding-edge
792 format. DATAFORM=main (the default) installs from the format
793 used in the 'africa' etc. files. DATAFORM=rearguard installs
794 from a trailing-edge format. Eventually, elements of today's
795 vanguard format should move to the main format, and similarly
796 the main format's features should eventually move to the
799 * In the current version, the main and rearguard formats are
800 identical and match that of 2018c, so this change does not
801 affect default behavior. The vanguard format currently contains
802 one feature not in the main format: negative SAVE values. This
803 improves support for Ireland, which uses Irish Standard Time
804 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has
805 supported negative SAVE values for decades, and this feature
806 should move to the main format soon. However, it will not move
807 to the rearguard format for quite some time because some
808 downstream parsers do not support it.
810 * The build procedure constructs three files vanguard.zi, main.zi,
811 and rearguard.zi, one for each format. Although the files
812 represent essentially the same data, they may have minor
813 discrepancies that users are not likely to notice. The files
814 are intended for downstream data consumers and are not
815 installed. Zoneinfo parsers that do not support negative SAVE values
816 should start using rearguard.zi, so that they will be unaffected
817 when the negative-DST feature moves from vanguard to main.
818 Bleeding-edge Zoneinfo parsers that support the new features
819 already can use vanguard.zi; in this respect, current tzcode is
822 The Makefile should now be safe for parallelized builds, and 'make
823 -j to2050new.tzs' is now much faster on a multiprocessor host
826 When built with -DSUPPRESS_TZDIR, the tzcode library no longer
827 prepends TZDIR/ to file names that do not begin with '/'. This is
828 not recommended for general use, due to its security implications.
829 (From a suggestion by Manuela Friedrich.)
833 zic now accepts subsecond precision in expressions like
834 00:19:32.13, which is approximately the legal time of the
835 Netherlands from 1835 to 1937. However, because it is
836 questionable whether the few recorded uses of non-integer offsets
837 had subsecond precision in practice, there are no plans for tzdata
838 to use this feature. (Thanks to Steve Allen for pointing out
839 the limitations of historical data in this area.)
841 The code is a bit more portable to MS-Windows. Installers can
842 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
843 reserve identifiers like 'localtime'. (Thanks to Manuela
846 Changes to documentation and commentary
848 theory.html now outlines tzdb's extensions to POSIX's model for
849 civil time, and has a section "POSIX features no longer needed"
850 that lists POSIX API components that are now vestigial.
851 (From suggestions by Steve Summit.) It also better distinguishes
852 time zones from tz regions. (From a suggestion by Guy Harris.)
854 Commentary is now more consistent about using the phrase "daylight
855 saving time", to match the C name tm_isdst. Daylight saving time
856 need not occur in summer, and need not have a positive offset from
859 Commentary about historical transitions in Uruguay has been expanded
860 with links to many relevant legal documents.
861 (Thanks to Tim Parenti.)
863 Commentary now uses some non-ASCII characters with Unicode value
864 less than U+0100, as they can be useful and should work even with
865 older editors such as XEmacs.
868 Release 2018c - 2018-01-22 23:00:44 -0800
871 Revert Irish changes that relied on negative SAVE values.
875 Revert the 2018a change to Europe/Dublin. As before, this change
876 does not affect UT offsets or abbreviations; it affects only
877 whether timestamps are considered to be standard time or
878 daylight-saving time, as expressed in the tm_isdst flag of C's
879 struct tm type. This reversion is intended to be a temporary
880 workaround for problems discovered with downstream uses of
881 releases 2018a and 2018b, which implemented Irish time by using
882 negative SAVE values in the Eire rules of the 'europe' file.
883 Although negative SAVE values have been part of tzcode for many
884 years and are supported by many platforms, they were not
885 documented before 2018a and ICU and OpenJDK do not currently
886 support them. A mechanism to export data to platforms lacking
887 support for negative DST is planned to be developed before the
888 change is reapplied. (Problems reported by Deborah Goldsmith and
891 Changes to past timestamps
893 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
894 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
896 Changes to build procedure
898 The build procedure now works around mawk 1.3.3's lack of support
899 for character class expressions. (Problem reported by Ohyama.)
902 Release 2018b - 2018-01-17 23:24:48 -0800
905 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
907 Changes to build procedure
909 The distribution now contains the file 'pacificnew' again.
910 This file was inadvertantly omitted in the 2018a distribution.
911 (Problem reported by Matias Fonzo.)
914 Release 2018a - 2018-01-12 22:29:21 -0800
917 São Tomé and Príncipe switched from +00 to +01.
918 Brazil's DST will now start on November's first Sunday.
919 Ireland's standard time is now in the summer, not the winter.
920 Use Debian-style installation locations, instead of 4.3BSD-style.
923 Changes to past and future timestamps
925 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
926 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
928 Changes to future timestamps
930 Starting in 2018 southern Brazil will begin DST on November's
931 first Sunday instead of October's third Sunday. (Thanks to
934 Changes to past timestamps
936 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
937 been corrected. The 'backzone' and 'zone.tab' files did not agree
938 with the 'africa' and 'zone1970.tab' files. (Problem reported by
941 The abbreviation invented for Bolivia Summer Time (1931-2) is now
942 BST instead of BOST, to be more consistent with the convention
943 used for Latvian Summer Time (1918-9) and for British Summer Time.
947 Change Europe/Dublin so that it observes Irish Standard Time (UT
948 +01) in summer and GMT (as negative daylight-saving) in winter,
949 instead of observing standard time (GMT) in winter and Irish
950 Summer Time (UT +01) in summer. This change does not affect UT
951 offsets or abbreviations; it affects only whether timestamps are
952 considered to be standard time or daylight-saving time, as
953 expressed in the tm_isdst flag of C's struct tm type.
954 (Discrepancy noted by Derick Rethans.)
956 Changes to build procedure
958 The default installation locations have been changed to mostly
959 match Debian circa 2017, instead of being designed as an add-on to
960 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
961 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
962 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
963 locations more precisely. (This responds to suggestions from
964 Brian Inglis and from Steve Summit.)
966 The default installation procedure no longer creates the
967 backward-compatibility link US/Pacific-New, which causes
968 confusion during user setup (e.g., see Debian bug 815200).
969 Use 'make BACKWARD="backward pacificnew"' to create the link
970 anyway, for now. Eventually we plan to remove the link entirely.
972 tzdata.zi now contains a version-number comment.
973 (Suggested by Tom Lane.)
975 The Makefile now quotes values like BACKWARD more carefully when
976 passing them to the shell. (Problem reported by Zefram.)
978 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
979 that have snprintf and use pre-C99 compilers. (Problem reported
984 zic has a new option -t FILE that specifies the location of the
985 file that determines local time when TZ is unset. The default for
986 this location can be configured via the new TZDEFAULT makefile
987 macro, which defaults to /etc/localtime.
989 Diagnostics and commentary now distinguish UT from UTC more
990 carefully; see theory.html for more information about UT vs UTC.
992 zic has been ported to GCC 8's -Wstringop-truncation option.
993 (Problem reported by Martin Sebor.)
995 Changes to documentation and commentary
997 The zic man page now documents the longstanding behavior that
998 times and years can be out of the usual range, with negative times
999 counting backwards from midnight and with year 0 preceding year 1.
1000 (Problem reported by Michael Deckers.)
1002 The theory.html file now mentions the POSIX limit of six chars
1003 per abbreviation, and lists alphabetic abbreviations used.
1005 The files tz-art.htm and tz-link.htm have been renamed to
1006 tz-art.html and tz-link.html, respectively, for consistency with
1007 other file names and to simplify web server configuration.
1010 Release 2017c - 2017-10-20 14:49:34 -0700
1013 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
1014 Fiji ends DST 2018-01-14, not 2018-01-21.
1015 Namibia switches from +01/+02 to +02 on 2018-04-01.
1016 Sudan switches from +03 to +02 on 2017-11-01.
1017 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
1018 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
1019 A new file tzdata.zi now holds a small text copy of all data.
1020 The zic input format has been regularized slightly.
1022 Changes to future timestamps
1024 Northern Cyprus has decided to resume EU rules starting
1025 2017-10-29, thus reinstituting winter time.
1027 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
1028 predicted. (Thanks to Dominic Fok.) Adjust future predictions
1031 Namibia will switch from +01 with DST to +02 all year on
1032 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
1033 at 02:00. (Thanks to Steffen Thorsen.)
1035 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
1036 Atyya and Yahia Abdalla.) South Sudan is not switching, so
1037 Africa/Juba is no longer a link to Africa/Khartoum.
1039 Tonga has likely ended its experiment with DST, and will not
1040 adjust its clocks on 2017-11-05. Although Tonga has not announced
1041 whether it will continue to observe DST, the IATA is assuming that
1042 it will not. (Thanks to David Wade.)
1044 Turks & Caicos will switch from -04 all year to -05 with US DST on
1045 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
1046 at 02:00. (Thanks to Steffen Thorsen.)
1048 Changes to past timestamps
1050 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
1051 (Thanks to Arthur David Olson.)
1053 Detroit did not observe DST in 1967.
1055 Use railway time for Asia/Kolkata before 1941, by switching to
1056 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
1057 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
1059 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
1060 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
1062 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
1063 American time in 1892, not 1879. (Thanks to Michael Deckers.)
1065 Adjust the 1867 transition in Alaska to better reflect the
1066 historical record, by changing it to occur on 1867-10-18 at 15:30
1067 Sitka time rather than at the start of 1867-10-17 local time.
1068 Although strictly speaking this is accurate only for Sitka,
1069 the rest of Alaska's blanks need to be filled in somehow.
1071 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
1072 (Thanks to Michael Deckers.)
1074 Add 7 s to the UT offset in Asia/Yangon before 1920.
1076 Changes to zone names
1078 Remove Canada/East-Saskatchewan from the 'backward' file, as it
1079 exceeded the 14-character limit and was an unused misnomer anyway.
1081 Changes to build procedure
1083 To support applications that prefer to read time zone data in text
1084 form, two zic input files tzdata.zi and leapseconds are now
1085 installed by default. The commands 'zic tzdata.zi' and 'zic -L
1086 leapseconds tzdata.zi' can reproduce the tzdata binary files
1087 without and with leap seconds, respectively. To prevent these two
1088 new files from being installed, use 'make TZDATA_TEXT=', and to
1089 suppress leap seconds from the tzdata text installation, use 'make
1090 TZDATA_TEXT=tzdata.zi'.
1092 'make BACKWARD=' now suppresses backward-compatibility names
1093 like 'US/Pacific' that are defined in the 'backward' and
1096 'make check' now works on systems that lack a UTF-8 locale,
1097 or that lack the nsgmls program. Set UTF8_LOCALE to configure
1098 the name of a UTF-8 locale, if you have one.
1100 Y2K runtime checks are no longer enabled by default. Add
1101 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
1102 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
1103 to disable them. (New name suggested by Brian Inglis.)
1105 The build procedure for zdump now works on AIX 7.1.
1106 (Problem reported by Kees Dekker.)
1110 zic and the reference runtime now reject multiple leap seconds
1111 within 28 days of each other, or leap seconds before the Epoch.
1112 As a result, support for double leap seconds, which was
1113 obsolescent and undocumented, has been removed. Double leap
1114 seconds were an error in the C89 standard; they have never existed
1115 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
1116 noticing glitches in the code that uncovered this problem.)
1118 zic now warns about use of the obsolescent and undocumented -y
1119 option, and about use of the obsolescent TYPE field of Rule lines.
1121 zic now allows unambiguous abbreviations like "Sa" and "Su" for
1122 weekdays; formerly it rejected them due to a bug. Conversely, zic
1123 no longer considers non-prefixes to be abbreviations; for example,
1124 it no longer accepts "lF" as an abbreviation for "lastFriday".
1125 Also, zic warns about the undocumented usage with a "last-"
1126 prefix, e.g., "last-Fri".
1128 Similarly, zic now accepts the unambiguous abbreviation "L" for
1129 "Link" in ordinary context and for "Leap" in leap-second context.
1130 Conversely, zic no longer accepts non-prefixes such as "La" as
1131 abbreviations for words like "Leap".
1133 zic no longer accepts leap second lines in ordinary input, or
1134 ordinary lines in leap second input. Formerly, zic sometimes
1135 warned about this undocumented usage and handled it incorrectly.
1137 The new macro HAVE_TZNAME governs whether the tzname external
1138 variable is exported, instead of USG_COMPAT. USG_COMPAT now
1139 governs only the external variables "timezone" and "daylight".
1140 This change is needed because the three variables are not in the
1141 same category: although POSIX requires tzname, it specifies the
1142 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
1143 if not defined, the code attempts to guess it from other macros.
1145 localtime.c and difftime.c no longer require stdio.h, and .c files
1146 other than zic.c no longer require sys/wait.h.
1148 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
1150 Calculation of time_t extrema works around a bug in GCC 4.8.4
1151 (Reported by Stan Shebs and Joseph Myers.)
1153 zic.c no longer mistranslates formats of line numbers in non-English
1154 locales. (Problem reported by Benno Schulenberg.)
1156 Several minor changes have been made to the code to make it a
1157 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
1158 Dekker for reporting the problems.)
1160 Changes to documentation and commentary
1162 The two new files 'theory.html' and 'calendars' contain the
1163 contents of the removed file 'Theory'. The goal is to document
1164 tzdb theory more accessibly.
1166 The zic man page now documents abbreviation rules.
1168 tz-link.htm now covers how to apply tzdata changes to clients.
1169 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
1171 The leap-seconds.list URL has been updated to something that is
1172 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
1174 Release 2017b - 2017-03-17 07:30:38 -0700
1176 Briefly: Haiti has resumed DST.
1178 Changes to past and future timestamps
1180 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
1182 Changes to past timestamps
1184 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
1186 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
1187 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
1191 The reference localtime implementation now falls back on the
1192 current US daylight-saving transition rules rather than the
1193 1987-2006 rules. This fallback occurs only when (1) the TZ
1194 environment variable has a value like "AST4ADT" that asks
1195 for daylight saving time but does not specify the rules, (2) there
1196 is no file by that name, and (3) the TZDEFRULES file cannot be
1197 loaded. (Thanks to Tom Lane.)
1200 Release 2017a - 2017-02-28 00:05:36 -0800
1202 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
1205 Changes to future timestamps
1207 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
1209 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
1210 Its clocks diverge from America/Santiago starting 2017-05-13 at
1211 23:00, hiving off a new zone America/Punta_Arenas. Although the
1212 Chilean government says this change expires in May 2019, for now
1213 assume it's permanent. (Thanks to Juan Correa and Deborah
1214 Goldsmith.) This also affects Antarctica/Palmer.
1216 Changes to past timestamps
1218 Fix many entries for historical timestamps for Europe/Madrid
1219 before 1979, to agree with tables compiled by Pere Planesas of the
1220 National Astronomical Observatory of Spain. As a side effect,
1221 this changes some timestamps for Africa/Ceuta before 1929, which
1222 are probably guesswork anyway. (Thanks to Steve Allen and
1223 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
1224 correcting the 1901 transition.)
1226 Ecuador observed DST from 1992-11-28 to 1993-02-05.
1227 (Thanks to Alois Treindl.)
1229 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
1230 (Thanks to Stepan Golosunov.)
1232 Changes to past and future time zone abbreviations
1234 Switch to numeric time zone abbreviations for South America, as
1235 part of the ongoing project of removing invented abbreviations.
1236 This avoids the need to invent an abbreviation for the new Chilean
1237 new zone. Similarly, switch from invented to numeric time zone
1238 abbreviations for Afghanistan, American Samoa, the Azores,
1239 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
1240 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
1241 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
1242 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
1243 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
1244 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
1245 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
1246 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
1247 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
1248 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
1249 for half-hour daylight saving time in Belize before 1944 and in
1250 the Dominican Republic before 1975; and for Canary Islands before
1251 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
1252 Indian Summer Time before 1942, for Indonesia before around 1964,
1253 for Kenya before 1960, for Liberia before 1973, for Madeira before
1254 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
1255 Pakistan before 1971, for Western Sahara before 1977, and for
1256 Zaporozhye in 1880-1924.
1258 For Alaska time from 1900 through 1967, instead of "CAT" use the
1259 abbreviation "AST", the abbreviation commonly used at the time
1260 (Atlantic Standard Time had not been standardized yet). Use "AWT"
1261 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
1263 Use "CST" and "CDT" instead of invented abbreviations for Macau
1264 before 1999 and Taiwan before 1938, and use "JST" instead of the
1265 invented abbreviation "JCST" for Japan and Korea before 1938.
1267 Change to database entry category
1269 Move the Pacific/Johnston link from 'australasia' to 'backward',
1270 since Johnston is now uninhabited.
1274 zic no longer mishandles some transitions in January 2038 when it
1275 attempts to work around Qt bug 53071. This fixes a bug affecting
1276 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
1277 now contains a workaround, useful when loading a file generated by
1278 a buggy zic. (Problem and localtime.c fix reported by Bradley
1281 zdump -i now outputs non-hour numeric time zone abbreviations
1282 without a colon, e.g., "+0530" rather than "+05:30". This agrees
1283 with zic %z and with common practice, and simplifies auditing of
1286 zdump is now buildable again with -DUSE_LTZ=0.
1287 (Problem reported by Joseph Myers.)
1289 zdump.c now always includes private.h, to avoid code duplication
1290 with private.h. (Problem reported by Kees Dekker.)
1292 localtime.c no longer mishandles early or late timestamps
1293 when TZ is set to a POSIX-style string that specifies DST.
1294 (Problem reported by Kees Dekker.)
1296 date and strftime now cause %z to generate "-0000" instead of
1297 "+0000" when the UT offset is zero and the time zone abbreviation
1300 Changes to documentation and commentary
1302 The 'Theory' file now better documents choice of historical time
1303 zone abbreviations. (Problems reported by Michael Deckers.)
1305 tz-link.htm now covers leap smearing, which is popular in clouds.
1308 Release 2016j - 2016-11-22 23:17:13 -0800
1310 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
1312 Changes to future timestamps
1314 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
1315 This hives off a new zone Europe/Saratov from Europe/Volgograd.
1316 (Thanks to Yuri Konotopov and Stepan Golosunov.)
1318 Changes to past timestamps
1320 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
1321 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
1322 1999, not fall 1994. (Thanks to Stepan Golosunov.)
1324 Changes to past time zone abbreviations
1326 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
1327 summer time before 1948. The old use of "EET" was a typo.
1331 zic no longer mishandles file systems that lack hard links, fixing
1332 bugs introduced in 2016g. (Problems reported by Tom Lane.)
1333 Also, when the destination already contains symbolic links, zic
1334 should now work better on systems where the 'link' system call
1335 does not follow symbolic links.
1337 Changes to documentation and commentary
1339 tz-link.htm now documents the relationship between release version
1340 numbers and development-repository commit tags. (Suggested by
1343 The 'Theory' file now documents UT.
1345 iso3166.tab now accents "Curaçao", and commentary now mentions
1346 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
1349 Release 2016i - 2016-11-01 23:19:52 -0700
1351 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
1352 reintroduces DST on 2016-11-06.
1354 Changes to future timestamps
1356 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
1357 2017-01-15 at 03:00. Assume future observances in Tonga will be
1358 from the first Sunday in November through the third Sunday in
1359 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
1360 time zone abbreviations for this zone.
1362 Changes to past and future timestamps
1364 Northern Cyprus is now +03 year round, causing a split in Cyprus
1365 time zones starting 2016-10-30 at 04:00. This creates a zone
1366 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
1368 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
1369 (Thanks to Steffen Thorsen.)
1371 Changes to past timestamps
1373 Several corrections were made for pre-1975 timestamps in Italy.
1374 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
1377 First, the 1893-11-01 00:00 transition in Italy used the new UT
1378 offset (+01), not the old (+00:49:56). (Thanks to Michael
1381 Second, rules for daylight saving in Italy were changed to agree
1382 with Italy's National Institute of Metrological Research (INRiM)
1383 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
1384 Inglis, and Michael Deckers):
1386 The 1916-06-03 transition was at 24:00, not 00:00.
1388 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
1391 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
1394 The 1944-09-17 transition was at 03:00, not 01:00. This
1395 particular change is taken from Italian law as INRiM's table,
1396 (which says 02:00) appears to have a typo here. Also, keep the
1397 1944-04-03 transition for Europe/Rome, as Rome was controlled by
1400 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
1405 The code should now be buildable on AmigaOS merely by setting the
1406 appropriate Makefile variables. (From a patch by Carsten Larsen.)
1409 Release 2016h - 2016-10-19 23:17:57 -0700
1411 Changes to future timestamps
1413 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
1414 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
1415 future fall transitions will be on the last Saturday of October
1416 at 01:00, which is consistent with predicted spring transitions
1417 on the last Saturday of March. (Thanks to Tim Parenti.)
1419 Changes to past timestamps
1421 In Turkey, transitions in 1986-1990 were at 01:00 standard time
1422 not at 02:00, and the spring 1994 transition was on March 20, not
1423 March 27. (Thanks to Kıvanç Yazan.)
1425 Changes to past and future time zone abbreviations
1427 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
1428 instead of alphabetic ones like "IST" and "LKT". Various
1429 English-language sources use "IST", "LKT" and "SLST", with no
1430 working consensus. (Usage of "SLST" mentioned by Sadika
1435 zic no longer mishandles relativizing file names when creating
1436 symbolic links like /etc/localtime, when these symbolic links
1437 are outside the usual directory hierarchy. This fixes a bug
1438 introduced in 2016g. (Problem reported by Andreas Stieger.)
1440 Changes to build procedure
1442 New rules 'traditional_tarballs' and 'traditional_signatures' for
1443 building just the traditional-format distribution. (Requested by
1446 The file 'version' is now put into the tzdata tarball too.
1447 (Requested by Howard Hinnant.)
1449 Changes to documentation and commentary
1451 The 'Theory' file now has a section on interface stability.
1452 (Requested by Paul Koning.) It also mentions features like
1453 tm_zone and localtime_rz that have long been supported by the
1456 tz-link.htm has improved coverage of time zone boundaries suitable
1457 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
1460 The US commentary now mentions Allen and the "day of two noons".
1462 The Fiji commentary mentions the government's 2016-10-03 press
1463 release. (Thanks to Raymond Kumar.)
1466 Release 2016g - 2016-09-13 08:56:38 -0700
1468 Changes to future timestamps
1470 Turkey switched from EET/EEST (+02/+03) to permanent +03,
1471 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
1472 than an invented abbreviation for the new time.
1474 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
1475 (Thanks to Tim Parenti.)
1477 Changes to past timestamps
1479 For America/Los_Angeles, spring-forward transition times have been
1480 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
1483 For zones using Soviet time on 1919-07-01, transitions to UT-based
1484 time were at 00:00 UT, not at 02:00 local time. The affected
1485 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
1486 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
1488 Changes to past and future time zone abbreviations
1490 The Factory zone now uses the time zone abbreviation -00 instead
1491 of a long English-language string, as -00 is now the normal way to
1492 represent an undefined time zone.
1494 Several zones in Antarctica and the former Soviet Union, along
1495 with zones intended for ships at sea that cannot use POSIX TZ
1496 strings, now use numeric time zone abbreviations instead of
1497 invented or obsolete alphanumeric abbreviations. The affected
1498 zones are Antarctica/Casey, Antarctica/Davis,
1499 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
1500 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
1501 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
1502 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
1503 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
1504 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
1505 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
1506 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
1507 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
1508 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
1509 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
1510 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
1511 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
1512 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
1513 was replaced by +05, whereas MSK and MSD were kept as they are not
1514 our invention and are widely used.
1516 Changes to zone names
1518 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
1519 (Thanks to David Massoud.)
1523 zic no longer generates binary files containing POSIX TZ-like
1524 strings that disagree with the local time type after the last
1525 explicit transition in the data. This fixes a bug with
1526 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
1527 on the reference platform. (Thanks to Alexander Belopolsky for
1528 reporting the bug and suggesting a way forward.)
1530 If the installed localtime and/or posixrules files are symbolic
1531 links, zic now keeps them symbolic links when updating them, for
1532 compatibility with platforms like OpenSUSE where other programs
1533 configure these files as symlinks.
1535 zic now avoids hard linking to symbolic links, avoids some
1536 unnecessary mkdir and stat system calls, and uses shorter file
1539 zdump has a new -i option to generate transitions in a
1540 more-compact but still human-readable format. This option is
1541 experimental, and the output format may change in future versions.
1542 (Thanks to Jon Skeet for suggesting that an option was needed,
1543 and thanks to Tim Parenti and Chris Rovick for further comments.)
1545 Changes to build procedure
1547 An experimental distribution format is available, in addition
1548 to the traditional format which will continue to be distributed.
1549 The new format is a tarball tzdb-VERSION.tar.lz with signature
1550 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
1551 tzdb-VERSION containing the code and data of the traditional
1552 two-tarball format, along with extra data that may be useful.
1553 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
1554 for comments about the experimental format.)
1556 The release version number is now more accurate in the usual case
1557 where releases are built from a Git repository. For example, if
1558 23 commits and some working-file changes have been made since
1559 release 2016g, the version number is now something like
1560 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
1561 Tagged releases use the same version number format as before,
1562 e.g., '2016g'. To support the more-accurate version number, its
1563 specification has moved from a line in the Makefile to a new
1564 source file 'version'.
1566 The experimental distribution contains a file to2050.tzs that
1567 contains what should be the output of 'zdump -i -c 2050' on
1568 primary zones. If this file is available, 'make check' now checks
1569 that zdump generates this output.
1571 'make check_web' now works on Fedora-like distributions.
1573 Changes to documentation and commentary
1575 tzfile.5 now documents the new restriction on POSIX TZ-like
1576 strings that is now implemented by zic.
1578 Comments now cite URLs for some 1917-1921 Russian DST decrees.
1579 (Thanks to Alexander Belopolsky.)
1581 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
1582 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
1583 description of Java 8 has been brought up to date (thanks to
1584 Stephen Colebourne). Its description of local time on Mars has
1585 been updated to match current practice, and URLs have been updated
1586 and some obsolete ones removed.
1589 Release 2016f - 2016-07-05 16:26:51 +0200
1591 Changes affecting future timestamps
1593 The Egyptian government changed its mind on short notice, and
1594 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
1595 (Thanks to Mina Samuel.)
1597 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
1598 (Thanks to Stepan Golosunov.)
1600 Changes to past and future timestamps
1602 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
1603 abbreviations instead of invented ones.
1605 Changes affecting past timestamps
1607 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
1608 (Thanks to Stepan Golosunov.)
1611 Release 2016e - 2016-06-14 08:46:16 -0700
1613 Changes affecting future timestamps
1615 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
1616 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
1617 For future years, guess April's last Thursday to October's last
1618 Thursday except for Ramadan.
1620 Changes affecting past timestamps
1622 Locations while uninhabited now use '-00', not 'zzz', as a
1623 placeholder time zone abbreviation. This is inspired by Internet
1624 RFC 3339 and is more consistent with numeric time zone
1625 abbreviations already used elsewhere. The change affects several
1626 arctic and antarctic locations, e.g., America/Cambridge_Bay before
1627 1920 and Antarctica/Troll before 2005.
1629 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
1630 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
1634 zic now outputs a dummy transition at time 2**31 - 1 in zones
1635 whose POSIX-style TZ strings contain a '<'. This mostly works
1636 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
1637 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
1639 Changes affecting documentation and commentary
1641 tz-link.htm says why governments should give plenty of notice for
1642 time zone or DST changes, and refers to Matt Johnson's blog post.
1644 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
1647 Release 2016d - 2016-04-17 22:50:29 -0700
1649 Changes affecting future timestamps
1651 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
1652 (Thanks to Alexander Krivenyshev for the heads-up.)
1654 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
1655 (Thanks to Alexander Krivenyshev and Matt Johnson.)
1657 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
1658 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
1659 at 02:00. (Thanks to Stepan Golosunov.)
1661 Changes affecting past timestamps
1663 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
1664 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1665 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1666 the same change. (Thanks to Stepan Golosunov.)
1668 Russia and nearby locations had daylight-saving transitions on
1669 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1670 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
1673 Many corrections to historical time in Kazakhstan from 1991
1674 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
1675 invented time zone abbreviations with numeric abbreviations.
1677 Changes to commentary
1679 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1682 Release 2016c - 2016-03-23 00:51:27 -0700
1684 Changes affecting future timestamps
1686 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
1688 Chile reverts from permanent to seasonal DST. (Thanks to Juan
1689 Correa for the heads-up, and to Tim Parenti for corrections.)
1690 Guess that future transitions are August's and May's second
1691 Saturdays at 24:00 mainland time. Also, call the period from
1692 2014-09-07 through 2016-05-14 daylight saving time instead of
1693 standard time, as that seems more appropriate now.
1695 Changes affecting past timestamps
1697 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1698 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1699 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1700 (Thanks to Stepan Golosunov.)
1702 Changes to commentary
1704 Several updates and URLs for historical and proposed Russian changes.
1705 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1708 Release 2016b - 2016-03-12 17:30:14 -0800
1712 Starting with release 2016b, some data entries cause zic implementations
1713 derived from tz releases 2005j through 2015e to issue warnings like
1714 "time zone abbreviation differs from POSIX standard (+03)".
1715 These warnings should not otherwise affect zic's output and can safely be
1716 ignored on today's platforms, as the warnings refer to a restriction in
1717 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
1718 warnings is to upgrade to zic derived from tz releases 2015f and later.
1720 Changes affecting future timestamps
1722 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1723 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1724 2016-03-27 at 02:00 local time. They need distinct zones since their
1725 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
1726 Altai Republic, Russia, which will switch from +06 to +07 on the same date
1727 and local time. The Astrakhan change is already official; the others have
1728 passed the first reading in the State Duma and are extremely likely.
1729 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1730 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1731 and Stepan Golosunov for followup.)
1733 As a trial of a new system that needs less information to be made up,
1734 the new zones use numeric time zone abbreviations like "+04"
1735 instead of invented abbreviations like "ASTT".
1737 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
1740 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1741 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1742 Saturday at 01:00, not March's last Friday at 24:00.
1744 Changes affecting past timestamps
1746 Europe/Chisinau observed DST during 1990, and switched from +04 to
1747 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1748 (Thanks to Stepan Golosunov.)
1750 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1751 KUYT/KUYST. (Thanks to Stepan Golosunov.)
1755 tzselect's diagnostics and checking, and checktab.awk's checking,
1756 have been improved. (Thanks to J William Piggott.)
1758 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
1760 tzselect now tests Julian-date TZ settings more accurately.
1761 (Thanks to J William Piggott.)
1763 Changes to commentary
1765 Comments in zone tables have been improved. (Thanks to J William Piggott.)
1767 tzselect again limits its menu comments so that menus fit on a
1768 24×80 alphanumeric display.
1770 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
1772 In the Theory file, the description of possible time zone abbreviations in
1773 tzdata has been cleaned up, as the old description was unclear and
1774 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
1777 Release 2016a - 2016-01-26 23:28:02 -0800
1779 Changes affecting future timestamps
1781 America/Cayman will not observe daylight saving this year after all.
1782 Revert our guess that it would. (Thanks to Matt Johnson.)
1784 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1785 (Thanks to Alexander Krivenyshev.)
1787 Asia/Tehran now has DST predictions for the year 2038 and later,
1788 to be March 21 00:00 to September 21 00:00. This is likely better
1789 than predicting no DST, albeit off by a day every now and then.
1791 Changes affecting past and future timestamps
1793 America/Metlakatla switched from PST all year to AKST/AKDT on
1794 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1796 America/Santa_Isabel has been removed, and replaced with a
1797 backward compatibility link to America/Tijuana. Its contents were
1798 apparently based on a misreading of Mexican legislation.
1800 Changes affecting past timestamps
1802 Asia/Karachi's two transition times in 2002 were off by a minute.
1803 (Thanks to Matt Johnson.)
1805 Changes affecting build procedure
1807 An installer can now combine leap seconds with use of the backzone file,
1808 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1809 The old 'make posix_packrat' rule is now marked as obsolescent.
1810 (Thanks to Ian Abbott for an initial implementation.)
1812 Changes affecting documentation and commentary
1814 A new file LICENSE makes it easier to see that the code and data
1815 are mostly public-domain. (Thanks to James Knight.) The three
1816 non-public-domain files now use the current (3-clause) BSD license
1817 instead of older versions of that license.
1819 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1820 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1821 on editing tz source files (with a mention of Sublime zoneinfo,
1822 thanks to Gilmore Davidson).
1824 The Theory and asia files now mention the 2015 book "The Global
1825 Transformation of Time, 1870-1950", and cite a couple of reviews.
1827 The America/Chicago entry now documents the informal use of US
1828 central time in Fort Pierre, South Dakota. (Thanks to Rick
1829 McDermid, Matt Johnson, and Steve Jones.)
1832 Release 2015g - 2015-10-01 00:39:51 -0700
1834 Changes affecting future timestamps
1836 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1839 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1840 (Thanks to Alexander Krivenyshev.)
1842 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1843 (Thanks to Ken Rylander.)
1845 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
1846 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1847 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
1849 Changes affecting past timestamps
1851 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1853 Changes affecting code
1855 localtime no longer mishandles America/Anchorage after 2037.
1856 (Thanks to Bradley White for reporting the bug.)
1858 On hosts with signed 32-bit time_t, localtime no longer mishandles
1859 Pacific/Fiji after 2038-01-16 14:00 UTC.
1861 The localtime module allows the variables 'timezone', 'daylight',
1862 and 'altzone' to be in common storage shared with other modules,
1863 and declares them in case the system <time.h> does not.
1864 (Problems reported by Kees Dekker.)
1866 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1867 This simplifies the code and is consistent with zdump.c.
1868 (Problem reported by Christos Zoulas.)
1870 Changes affecting documentation
1872 The tzfile man page now documents that transition times denote the
1873 starts (not the ends) of the corresponding time periods.
1874 (Ambiguity reported by Bill Seymour.)
1877 Release 2015f - 2015-08-10 18:06:56 -0700
1879 Changes affecting future timestamps
1881 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1882 The abbreviation remains "KST". (Thanks to Robert Elz.)
1884 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1887 Changes affecting past and future timestamps
1889 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1890 (Thanks to Roman Tudos.)
1892 Changes affecting data format and code
1894 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1895 field of a Rule line should now be '-'; the old values 'even',
1896 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1897 Although the implementation has not changed, these features do not
1898 work in the default installation, they are not used in the data,
1899 and they are now considered obsolescent.
1901 zic now checks that two rules don't take effect at the same time.
1902 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1903 simultaneity are now documented.
1905 The two characters '%z' in a zone format now stand for the UT
1906 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1907 five hours and thirty minutes ahead. This better supports time
1908 zone abbreviations conforming to POSIX.1-2001 and later.
1910 Changes affecting installed data files
1912 Comments for America/Halifax and America/Glace_Bay have been improved.
1913 (Thanks to Brian Inglis.)
1915 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1916 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1917 installed data files for Europe/Simferopol and Europe/Tallinn.
1918 It does not affect timestamps. (Thanks to Howard Hinnant.)
1920 Changes affecting code
1922 zdump and zic no longer warn about valid time zone abbreviations
1925 Some Visual Studio 2013 warnings have been suppressed.
1926 (Thanks to Kees Dekker.)
1928 'date' no longer sets the time of day and its -a, -d, -n and -t
1929 options have been removed. Long obsolescent, the implementation
1930 of these features had porting problems. Builders no longer need
1931 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1932 (Thanks to Kees Dekker for pointing out the problem.)
1934 Changes affecting documentation
1936 The Theory file mentions naming issues earlier, as these seem to be
1937 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1939 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1941 Mention that Herbert Samuel introduced the term "Summer Time".
1944 Release 2015e - 2015-06-13 10:56:02 -0700
1946 Changes affecting future timestamps
1948 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1949 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1951 Assume Cayman Islands will observe DST starting next year, using US rules.
1952 Although it isn't guaranteed, it is the most likely.
1954 Changes affecting data format
1956 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1957 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1959 Changes affecting code
1961 When displaying data, tzselect converts it to the current locale's
1962 encoding if the iconv command works. (Problem reported by random832.)
1964 tzselect no longer mishandles Dominica, fixing a bug introduced
1965 in Release 2014f. (Problem reported by Owen Leibman.)
1967 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1968 This fixes a bug introduced in Release 2014f.
1969 (Problem reported by Leonardo Chiquitto.)
1972 Release 2015d - 2015-04-24 08:09:46 -0700
1974 Changes affecting future timestamps
1976 Egypt will not observe DST in 2015 and will consider canceling it
1977 permanently. For now, assume no DST indefinitely.
1978 (Thanks to Ahmed Nazmy and Tim Parenti.)
1980 Changes affecting past timestamps
1982 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1983 1966-07-01. Also, Yukon's time zone history is documented better.
1984 (Thanks to Brian Inglis and Dennis Ferguson.)
1986 Change affecting past and future time zone abbreviations
1988 The abbreviations for Hawaii-Aleutian standard and daylight times
1989 have been changed from HAST/HADT to HST/HDT, as per US Government
1990 Printing Office style. This affects only America/Adak since 1983,
1991 as America/Honolulu was already using the new style.
1993 Changes affecting code
1995 zic has some minor performance improvements.
1998 Release 2015c - 2015-04-11 08:55:55 -0700
2000 Changes affecting future timestamps
2002 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
2003 not 00:00 on April's last Friday. 2015's transition will therefore be on
2004 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
2005 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
2007 Changes affecting past timestamps
2009 The following changes affect some pre-1991 Chile-related timestamps
2010 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
2012 The 1910 transition was January 10, not January 1.
2014 The 1918 transition was September 10, not September 1.
2016 The UT -04 time observed from 1932 to 1942 is now considered to
2017 be standard time, not year-round DST.
2019 Santiago observed DST (UT -03) from 1946-07-15 through
2020 1946-08-31, then reverted to standard time, then switched to -05
2023 Assume transitions before 1968 were at 00:00, since we have no data
2026 The spring 1988 transition was 1988-10-09, not 1988-10-02.
2027 The fall 1990 transition was 1990-03-11, not 1990-03-18.
2029 Assume no UT offset change for Pacific/Easter on 1890-01-01,
2030 and omit all transitions on Pacific/Easter from 1942 through 1946
2031 since we have no data suggesting that they existed.
2033 One more zone has been turned into a link, as it differed
2034 from an existing zone only for older timestamps. As usual,
2035 this change affects UT offsets in pre-1970 timestamps only.
2036 The zone's old contents have been moved to the 'backzone' file.
2037 The affected zone is America/Montreal.
2039 Changes affecting commentary
2041 Mention the TZUpdater tool.
2043 Mention "The Time Now". (Thanks to Brandon Ramsey.)
2046 Release 2015b - 2015-03-19 23:28:11 -0700
2048 Changes affecting future timestamps
2050 Mongolia will start observing DST again this year, from the last
2051 Saturday in March at 02:00 to the last Saturday in September at 00:00.
2052 (Thanks to Ganbold Tsagaankhuu.)
2054 Palestine will start DST on March 28, not March 27. Also,
2055 correct the fall 2014 transition from September 26 to October 24.
2056 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
2058 Changes affecting past timestamps
2060 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
2061 regression. (Thanks to Stuart Bishop for reporting the problem.)
2063 Some more zones have been turned into links, when they differed
2064 from existing zones only for older timestamps. As usual,
2065 these changes affect UT offsets in pre-1970 timestamps only.
2066 Their old contents have been moved to the 'backzone' file.
2067 The affected zones are: America/Antigua, America/Cayman,
2068 Pacific/Midway, and Pacific/Saipan.
2070 Changes affecting time zone abbreviations
2072 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
2075 Changes affecting code
2077 Fix integer overflow bug in reference 'mktime' implementation.
2078 (Problem reported by Jörg Richter.)
2080 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
2081 to be used in the same executable as standard-library time_t functions.
2082 (Problems reported by Bradley White.)
2084 Changes affecting commentary
2086 Cite the recent Mexican decree changing Quintana Roo's time zone.
2087 (Thanks to Carlos Raúl Perasso.)
2089 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
2091 Update info about Mars time.
2094 Release 2015a - 2015-01-29 22:35:20 -0800
2096 Changes affecting future timestamps
2098 The Mexican state of Quintana Roo, represented by America/Cancun,
2099 will shift from Central Time with DST to Eastern Time without DST
2100 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
2102 Chile will not change clocks in April or thereafter; its new standard time
2103 will be its old daylight saving time. This affects America/Santiago,
2104 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
2106 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
2107 (Thanks to Tim Parenti.)
2109 Changes affecting past timestamps
2111 Iceland observed DST in 1919 and 1921, and its 1939 fallback
2112 transition was Oct. 29, not Nov. 29. Remove incorrect data from
2113 Shanks about time in Iceland between 1837 and 1908.
2115 Some more zones have been turned into links, when they differed
2116 from existing zones only for older timestamps. As usual,
2117 these changes affect UT offsets in pre-1970 timestamps only.
2118 Their old contents have been moved to the 'backzone' file.
2119 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
2122 Changes affecting code
2124 tzalloc now scrubs time zone abbreviations compatibly with the way
2125 that tzset always has, by replacing invalid bytes with '_' and by
2126 shortening too-long abbreviations.
2128 tzselect ports to POSIX awk implementations, no longer mishandles
2129 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
2130 settings to the user. (Thanks to Stefan Kuhn.)
2132 Changes affecting build procedure
2134 'make check' now checks for links to links in the data.
2135 One such link (for Africa/Asmera) has been fixed.
2136 (Thanks to Stephen Colebourne for pointing out the problem.)
2138 Changes affecting commentary
2140 The leapseconds file commentary now mentions the expiration date.
2141 (Problem reported by Martin Burnicki.)
2143 Update Mexican Library of Congress URL.
2146 Release 2014j - 2014-11-10 17:37:11 -0800
2148 Changes affecting current and future timestamps
2150 Turks & Caicos' switch from US eastern time to UT -04 year-round
2151 did not occur on 2014-11-02 at 02:00. It's currently scheduled
2152 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
2154 Changes affecting past timestamps
2156 Many pre-1989 timestamps have been corrected for Asia/Seoul and
2157 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
2158 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
2159 longer guess that Pyongyang mimicked Seoul time after World War II,
2160 as this is politically implausible.
2162 Some more zones have been turned into links, when they differed
2163 from existing zones only for older timestamps. As usual,
2164 these changes affect UT offsets in pre-1970 timestamps only.
2165 Their old contents have been moved to the 'backzone' file.
2166 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
2167 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
2168 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
2171 Changes affecting commentary
2173 The commentary is less enthusiastic about Shanks as a source,
2174 and is more careful to distinguish UT from UTC.
2177 Release 2014i - 2014-10-21 22:04:57 -0700
2179 Changes affecting future timestamps
2181 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
2182 (Thanks to Ken Rylander for the heads-up.) Guess that future
2183 years will use a similar pattern.
2185 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
2186 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
2187 (Thanks to Kiley Walbom for the heads-up.)
2189 Changes affecting time zone abbreviations
2191 Since Belarus is not changing its clocks even though Moscow is,
2192 the time zone abbreviation in Europe/Minsk is changing from FET
2193 to its more-traditional value MSK on 2014-10-26 at 01:00.
2194 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
2196 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
2197 Indochina, to distinguish it better from ICT (+07).
2199 Changes affecting past timestamps
2201 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
2202 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
2203 authoritative book). Asia/Ho_Chi_Minh has been added to
2204 zone1970.tab, to give tzselect users in Vietnam two choices,
2205 since north and south Vietnam disagreed after our 1970 cutoff.
2207 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
2208 they differed from existing zones only for older timestamps. As
2209 usual, these changes affect pre-1970 timestamps only. Their old
2210 contents have been moved to the 'backzone' file.
2212 Changes affecting code
2214 The time-related library functions now set errno on failure, and
2215 some crashes in the new tzalloc-related library functions have
2216 been fixed. (Thanks to Christos Zoulas for reporting most of
2217 these problems and for suggesting fixes.)
2219 If USG_COMPAT is defined and the requested timestamp is standard time,
2220 the tz library's localtime and mktime functions now set the extern
2221 variable timezone to a value appropriate for that timestamp; and
2222 similarly for ALTZONE, daylight saving time, and the altzone variable.
2223 This change is a companion to the tzname change in 2014h, and is
2224 designed to make timezone and altzone more compatible with tzname.
2226 The tz library's functions now set errno to EOVERFLOW if they fail
2227 because the result cannot be represented. ctime and ctime_r now
2228 return NULL and set errno when a timestamp is out of range, rather
2229 than having undefined behavior.
2231 Some bugs associated with the new 2014g functions have been fixed.
2232 This includes a bug that largely incapacitated the new functions
2233 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
2234 It also includes some uses of uninitialized variables after tzalloc.
2235 The new code uses the standard type 'ssize_t', which the Makefile
2236 now gives porting advice about.
2238 Changes affecting commentary
2240 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
2243 Release 2014h - 2014-09-25 18:59:03 -0700
2245 Changes affecting past timestamps
2247 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
2249 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
2250 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
2252 Some more zones have been turned into links, when they differed
2253 from existing zones only for older timestamps. As usual,
2254 these changes affect UT offsets in pre-1970 timestamps only.
2255 Their old contents have been moved to the 'backzone' file.
2256 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
2257 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
2258 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
2260 Changes affecting code
2262 zdump -V and -v now output gmtoff= values on all platforms,
2263 not merely on platforms defining TM_GMTOFF.
2265 The tz library's localtime and mktime functions now set tzname to a value
2266 appropriate for the requested timestamp, and zdump now uses this
2267 on platforms not defining TM_ZONE, fixing a 2014g regression.
2268 (Thanks to Tim Parenti for reporting the problem.)
2270 The tz library no longer sets tzname if localtime or mktime fails.
2272 zdump -c no longer mishandles transitions near year boundaries.
2273 (Thanks to Tim Parenti for reporting the problem.)
2275 An access to uninitialized data has been fixed.
2276 (Thanks to Jörg Richter for reporting the problem.)
2278 When THREAD_SAFE is defined, the code ports to the C11 memory model.
2279 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
2280 and two threads race to initialize data used by gmtime-like functions.
2281 (Thanks to Andy Heninger for reporting the problems.)
2283 Changes affecting build procedure
2285 'make check' now checks better for properly-sorted data.
2287 Changes affecting documentation and commentary
2289 zdump's gmtoff=N output is now documented, and its isdst=D output
2290 is now documented to possibly output D values other than 0 or 1.
2292 zdump -c's treatment of years is now documented to use the
2293 Gregorian calendar and Universal Time without leap seconds,
2294 and its behavior at cutoff boundaries is now documented better.
2295 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
2297 Programs are now documented to use the proleptic Gregorian calendar.
2298 (Thanks to Alan Barrett for the suggestion.)
2300 Fractional-second GMT offsets have been documented for civil time
2301 in 19th-century Chennai, Jakarta, and New York.
2304 Release 2014g - 2014-08-28 12:31:23 -0700
2306 Changes affecting future timestamps
2308 Turks & Caicos is switching from US eastern time to UT -04
2309 year-round, modeled as a switch on 2014-11-02 at 02:00.
2310 [As noted in 2014j, this switch was later delayed.]
2312 Changes affecting past timestamps
2314 Time in Russia or the USSR before 1926 or so has been corrected by
2315 a few seconds in the following zones: Asia/Irkutsk,
2316 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
2317 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
2318 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
2319 Vladimir Karpinsky.)
2321 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
2322 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
2323 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
2324 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
2325 (Thanks to Stephen Colebourne for pointing to the decree.)
2327 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
2329 A new file 'backzone' contains data which may appeal to
2330 connoisseurs of old timestamps, although it is out of scope for
2331 the tz database, is often poorly sourced, and contains some data
2332 that is known to be incorrect. The new file is not recommended
2333 for ordinary use and its entries are not installed by default.
2334 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
2335 Isle of Man entries.)
2337 Some more zones have been turned into links, when they differed
2338 from existing zones only for older timestamps. As usual,
2339 these changes affect UT offsets in pre-1970 timestamps only.
2340 Their old contents have been moved to the 'backzone' file.
2341 The affected zones are: Africa/Bangui, Africa/Brazzaville,
2342 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
2343 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
2345 Changes affecting code
2347 Unless NETBSD_INSPIRED is defined to 0, the tz library now
2348 supplies functions for creating and using objects that represent
2349 timezones. The new functions are tzalloc, tzfree, localtime_rz,
2350 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
2351 time2posix_z. They are intended for performance: for example,
2352 localtime_rz (unlike localtime_r) is trivially thread-safe without
2353 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
2354 functions, and to Alan Barrett and Jonathan Lennox for helping to
2357 zdump now builds with the tz library unless USE_LTZ is defined to 0,
2358 This lets zdump use tz features even if the system library lacks them.
2359 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
2360 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
2362 zdump now uses localtime_rz if available, as it's significantly faster,
2363 and it can help zdump better diagnose invalid timezone names.
2364 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
2365 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
2366 not available, zdump now uses localtime_r and tzset if available,
2367 as this is a bit cleaner and faster than plain localtime. Compile
2368 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
2369 lacks these two functions.
2371 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
2372 Although not needed for tz's own applications, which are single-threaded,
2373 this supports POSIX better if the tz library is used in multithreaded apps.
2375 Some crashes have been fixed when zdump or the tz library is given
2376 invalid or outlandish input.
2378 The tz library no longer mishandles leap seconds on platforms with
2379 unsigned time_t in timezones that lack ordinary transitions after 1970.
2381 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
2382 already defined, to make it easier to configure on common platforms.
2383 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
2385 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
2386 assumes that reading uninitialized memory yields garbage values
2387 but does not cause other problems such as traps.
2389 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
2390 more likely to guess right for ambiguous timestamps near
2391 transitions where tm_isdst does not change.
2393 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
2394 strftime_l for compatibility with recent versions of POSIX.
2395 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
2396 to 1 on recent POSIX versions, and to 0 otherwise.
2398 tzselect -c now uses a hybrid distance measure that works better
2399 in Africa. (Thanks to Alan Barrett for noting the problem.)
2401 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
2402 or when time_tz is defined.
2404 When HAVE_UTMPX_H is set the 'date' command now builds on systems
2405 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
2406 the date it updates the wtmpx file if _PATH_WTMPX is defined.
2407 This affects GNU/Linux and similar systems.
2409 For easier maintenance later, some C code has been simplified,
2410 some lint has been removed, and the code has been tweaked so that
2411 plain 'make' is more likely to work.
2413 The C type 'bool' is now used for boolean values, instead of 'int'.
2415 The long-obsolete LOCALE_HOME code has been removed.
2417 The long-obsolete 'gtime' function has been removed.
2419 Changes affecting build procedure
2421 'zdump' no longer links in ialloc.o, as it's not needed.
2423 'make check_time_t_alternatives' no longer assumes GNU diff.
2425 Changes affecting distribution tarballs
2427 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
2428 the tzdata tarball instead of the tzcode tarball, since they help
2429 maintain the data. The NEWS and Theory files are now also
2430 distributed in the tzdata tarball, as they're relevant for data.
2431 (Thanks to Alan Barrett for pointing this out.) Also, the
2432 leapseconds.awk file is no longer distributed in the tzcode
2433 tarball, since it belongs in the tzdata tarball (where 2014f
2434 inadvertently also distributed it).
2436 Changes affecting documentation and commentary
2438 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
2439 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
2442 The man pages have been updated to use function prototypes,
2443 to document thread-safe variants like localtime_r, and to document
2444 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
2447 The fields in Link lines have been renamed to be more descriptive
2448 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
2449 and LINK-TO has become LINK-NAME.
2451 tz-link.htm mentions the IETF's tzdist working group; Windows
2452 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
2454 Some broken URLs have been fixed in the commentary. (Thanks to
2457 Commentary about Philippines DST has been updated, and commentary
2458 on pre-1970 time in India has been added.
2461 Release 2014f - 2014-08-05 17:42:36 -0700
2463 Changes affecting future timestamps
2465 Russia will subtract an hour from most of its time zones on 2014-10-26
2466 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
2467 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
2468 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
2469 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
2470 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
2471 (Europe/Samara) are not changing their clocks. The changed zones are
2472 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
2473 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
2474 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
2475 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
2476 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
2477 but not its UTC offset. Two zones are added: Asia/Chita (split
2478 from Asia/Yakutsk, and also with two hours subtracted) and
2479 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
2480 subtracted). (Thanks to Tim Parenti for much of the above.)
2482 Changes affecting time zone abbreviations
2484 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
2485 and similarly for the other Australian zones. That is, for eastern
2486 standard and daylight saving time the abbreviations are AEST and AEDT
2487 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
2488 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
2489 This change does not affect UT offsets, only time zone abbreviations.
2490 (Thanks to Rich Tibbett and many others.)
2492 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
2493 effective 2014-10-26 at 02:00 local time.
2495 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
2496 has been changed from URUT to XJT. (Thanks to Luther Ma.)
2498 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
2499 Similarly, prefer EET/EEST for eastern European time in Russia.
2501 Change time zone abbreviations in (western) Samoa to use "ST" and
2502 "DT" suffixes, as this is more likely to match common practice.
2503 Prefix "W" to (western) Samoa time when its standard-time offset
2504 disagrees with that of American Samoa.
2506 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
2508 Time zone abbreviations have been updated for Japan's two time
2509 zones used 1896-1937. JWST now stands for Western Standard
2510 Time, and JCST for Central Standard Time (formerly this was CJT).
2511 These abbreviations are now used for time in Korea, Taiwan,
2512 and Sakhalin while controlled by Japan.
2514 Changes affecting past timestamps
2516 China's five zones have been simplified to two, since the post-1970
2517 differences in the other three seem to have been imaginary. The
2518 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
2519 removed; backwards-compatibility links still work, albeit with
2520 different behaviors for timestamps before May 1980. Asia/Urumqi's
2521 1980 transition to UT +08 has been removed, so that it is now at
2522 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
2523 Treindl sent helpful translations of two papers by Guo Qingsheng.)
2525 Some zones have been turned into links, when they differed from existing
2526 zones only for older UT offsets where data entries were likely invented.
2527 These changes affect UT offsets in pre-1970 timestamps only. This is
2528 similar to the change in release 2013e, except this time for western
2529 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
2530 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
2531 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
2532 Atlantic/St_Helena. This also affects the backwards-compatibility
2533 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
2534 Tim Parenti, and David Patte for reporting problems in earlier
2535 versions of this change.)
2537 Asia/Shanghai's pre-standard-time UT offset has been changed from
2538 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
2539 transition to standard time has been changed from 1928 to 1901.
2541 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
2542 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
2543 In 1946 it observed DST from 05-15 through 09-30; in 1947
2544 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
2545 (Thanks to Yu-Cheng Chuang.)
2547 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
2549 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
2550 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
2552 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
2553 period from 1911 to 1950.
2555 Pacific/Chatham has been changed to New Zealand standard time plus
2556 45 minutes for the period before 1957, reflecting a 1956 remark in
2557 the New Zealand parliament.
2559 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
2560 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
2561 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
2562 not 04-06 at 02:00; and there was no DST in 1920.
2564 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
2566 Time in Russia before 1927 or so has been corrected by a few seconds in
2567 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
2568 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
2569 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
2570 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
2572 Changes affecting data format
2574 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
2575 The new file's extended format allows multiple country codes per zone.
2576 The older file is still installed but is deprecated; its format is
2577 not changing and it will still be distributed for a while, but new
2578 applications should use the new file.
2580 The new file format simplifies maintenance of obscure locations.
2581 To test this, it adds coverage for the Crozet Islands and the
2582 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
2584 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
2585 It is still ASCII now, but commentary about the switch has been added.
2586 The new file 'zone1970.tab' already uses UTF-8.
2588 Changes affecting code
2590 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
2591 is defined. (Thanks to Elliott Hughes for reporting the problem.)
2593 'zic' no longer mishandles input when ignoring case in locales that
2594 are not compatible with English, e.g., unibyte Turkish locales when
2595 compiled with HAVE_GETTEXT.
2597 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
2598 they no longer use ASCII '-' as if it were a dash.
2600 'zic' now rejects output file names that contain '.' or '..' components.
2601 (Thanks to Tim Parenti for reporting the problem.)
2603 'zic -v' now warns about output file names that do not follow
2604 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
2605 David Olson for starting the ball rolling on this.)
2607 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
2609 Changes affecting build procedure
2611 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
2612 (Thanks to John Cochran.)
2614 Changes affecting documentation and commentary
2616 The 'Theory' file documents legacy names, the longstanding
2617 exceptions to the POSIX-inspired file name rules.
2619 The 'zic' documentation clarifies the role of time types when
2620 interpreting dates. (Thanks to Arthur David Olson.)
2622 Documentation and commentary now prefer UTF-8 to US-ASCII,
2623 allowing the use of proper accents in foreign words and names.
2624 Code and data have not changed because of this. (Thanks to
2625 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
2628 Non-HTML documentation and commentary now use plain-text URLs instead of
2629 HTML insertions, and are more consistent about bracketing URLs when they
2630 are not already surrounded by white space. (Thanks to suggestions by
2633 There is new commentary about Xujiahui Observatory, the five time-zone
2634 project in China from 1918 to 1949, timekeeping in Japanese-occupied
2635 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
2636 warlord Jin Shuren in the data.
2638 Commentary about the coverage of each Russian zone has been standardized.
2639 (Thanks to Tim Parenti.)
2641 There is new commentary about contemporary timekeeping in Ethiopia.
2643 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
2645 There is new commentary about time in Poland in 1919.
2647 Proper credit has been given to DST inventor George Vernon Hudson.
2649 Commentary about time in Metlakatla, AK and Resolute, NU has been
2650 improved, with a new source for the former.
2652 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
2655 Commentary about permanent Antarctic bases has been updated.
2657 Several typos have been corrected. (Thanks to Tim Parenti for
2658 contributing some of these fixes.)
2660 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
2661 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
2662 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
2663 (Thanks to a heads-up from Dirkjan Ochtman.)
2665 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2666 have been removed. These obsolescent US Naval Observatory entries were no
2667 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
2670 Release 2014e - 2014-06-12 21:53:52 -0700
2672 Changes affecting near-future timestamps
2674 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2675 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
2676 switch to standard time at 24:00 the last Thursday before Ramadan, and
2677 back to DST at 00:00 the first Friday after Ramadan.
2679 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
2680 to Milamber Space Network.) Guess that from 2015 on Morocco will
2681 temporarily switch to standard time at 03:00 the last Saturday before
2682 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2684 Changes affecting past timestamps
2686 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2687 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
2688 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2689 in 1991. (Thanks to Hank W. for reporting the problems.)
2691 Changes affecting commentary
2693 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2694 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2695 removes stale pointers to World Time Explorer and WORLDTIME.
2698 Release 2014d - 2014-05-27 21:34:40 -0700
2700 Changes affecting code
2702 zic no longer generates files containing timestamps before the Big Bang.
2703 This works around GNOME glib bug 878
2704 <https://gitlab.gnome.org/GNOME/glib/issues/878>
2705 (Thanks to Leonardo Chiquitto for reporting the bug, and to
2706 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2708 Changes affecting documentation
2710 tz-link.htm now mentions GNOME.
2713 Release 2014c - 2014-05-13 07:44:13 -0700
2715 Changes affecting near-future timestamps
2717 Egypt observes DST starting 2014-05-15 at 24:00.
2718 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2719 Details have not been announced, except that DST will not be observed
2720 during Ramadan. Guess that DST will stop during the same Ramadan dates as
2721 Morocco, and that Egypt's future spring and fall transitions will be the
2722 same as 2010 when it last observed DST, namely April's last Friday at
2723 00:00 to September's last Thursday at 23:00 standard time. Also, guess
2724 that Ramadan transitions will be at 00:00 standard time.
2726 Changes affecting code
2728 zic now generates transitions for minimum time values, eliminating guesswork
2729 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
2731 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
2733 Changes affecting commentary and documentation
2735 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
2738 Release 2014b - 2014-03-24 21:28:50 -0700
2740 Changes affecting near-future timestamps
2742 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2743 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
2745 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
2746 Bengt-Inge Larsson.) This is currently an approximation; a better version
2747 will require the zic and localtime fixes mentioned below, and the plan is
2748 to wait for a while until at least the zic fixes propagate.
2750 Changes affecting code
2752 'zic' and 'localtime' no longer reject locations needing four transitions
2753 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
2754 Also, 'zic' avoids some unlikely failures due to integer overflow.
2756 Changes affecting build procedure
2758 'make check' now detects Rule lines defined but never used.
2759 The NZAQ rules, an instance of this problem, have been removed.
2761 Changes affecting commentary and documentation
2763 Fix Tuesday/Thursday typo in description of time in Israel.
2764 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2766 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
2767 to Donald MacQueen.) Instead, the Microsoft Windows Store app
2768 library supports them.
2770 Add comments about Johnston Island time in the 1960s.
2771 (Thanks to Lyle McElhaney.)
2773 Morocco's 2014 DST start will be as predicted.
2774 (Thanks to Sebastien Willemijns.)
2777 Release 2014a - 2014-03-07 23:30:29 -0800
2779 Changes affecting near-future timestamps
2781 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
2782 the heads-up, and to Tim Parenti for simplifying the update.)
2784 Changes affecting past timestamps
2786 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2787 (Thanks to Steffen Thorsen.)
2789 Ukraine switched from Moscow to Eastern European time on 1990-07-01
2790 (not 1992-01-01), and observed DST during the entire next winter.
2791 (Thanks to Vladimir in Moscow via Alois Treindl.)
2793 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2794 (Thanks to Avigdor Finkelstein.)
2796 Changes affecting code
2798 A uninitialized-storage bug in 'localtime' has been fixed.
2799 (Thanks to Logan Chien.)
2801 Changes affecting the build procedure
2803 The settings for 'make check_web' now default to Ubuntu 13.10.
2805 Changes affecting commentary and documentation
2807 The boundary of the US Pacific time zone is given more accurately.
2808 (Thanks to Alan Mintz.)
2810 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
2812 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
2814 Better descriptions of countries with same time zone history as
2815 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
2817 Several changes affect tz-link.htm, the main web page.
2819 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2822 Mention xCal (Internet RFC 6321) and jCal.
2824 Microsoft has some support for tz database names.
2826 CLDR data formats include both XML and JSON.
2828 Mention Maggiolo's map of solar vs standard time.
2829 (Thanks to Arthur David Olson.)
2831 Mention TZ4Net. (Thanks to Matt Johnson.)
2833 Mention the timezone-olson Haskell package.
2835 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
2837 Remove moribund links to daylight-savings-time.info and to
2838 Simple Timer + Clocks.
2840 Update two links. (Thanks to Oscar van Vlijmen.)
2842 Fix some formatting glitches, e.g., remove random newlines from
2843 abbr elements' title attributes.
2846 Release 2013i - 2013-12-17 07:25:23 -0800
2848 Changes affecting near-future timestamps:
2850 Jordan switches back to standard time at 00:00 on December 20, 2013.
2851 The 2006-2011 transition schedule is planned to resume in 2014.
2852 (Thanks to Steffen Thorsen.)
2854 Changes affecting past timestamps:
2856 In 2004, Cuba began DST on March 28, not April 4.
2857 (Thanks to Steffen Thorsen.)
2859 Changes affecting code
2861 The compile-time flag NOSOLAR has been removed, as nowadays the
2862 benefit of slightly shrinking runtime table size is outweighed by the
2863 cost of disallowing potential future updates that exceed old limits.
2865 Changes affecting documentation and commentary
2867 The files solar87, solar88, and solar89 are no longer distributed.
2868 They were a negative experiment - that is, a demonstration that
2869 tz data can represent solar time only with some difficulty and error.
2870 Their presence in the distribution caused confusion, as Riyadh
2871 civil time was generally not solar time in those years.
2873 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2876 Release 2013h - 2013-10-25 15:32:32 -0700
2878 Changes affecting current and future timestamps:
2880 Libya has switched its UT offset back to +02 without DST, instead
2881 of +01 with DST. (Thanks to Even Scharning.)
2883 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2884 (Thanks to Gwillim Law.)
2886 Changes affecting future timestamps:
2888 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2889 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2890 (Thanks to Steffen Thorsen.)
2892 Add entries for DST transitions in Morocco in the year 2038.
2893 This avoids some year-2038 glitches introduced in 2013g.
2894 (Thanks to Yoshito Umaoka for reporting the problem.)
2896 Changes affecting API
2898 The 'tzselect' command no longer requires the 'select' command,
2899 and should now work with /bin/sh on more platforms. It also works
2900 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2901 Patrick 'P. J.' McDermott and Alan Barrett.)
2903 Changes affecting code
2905 Fix localtime overflow bugs with 32-bit unsigned time_t.
2907 zdump no longer assumes sscanf returns maximal values on overflow.
2909 Changes affecting the build procedure
2911 The builder can specify which programs to use, if any, instead of
2912 'ar' and 'ranlib', and libtz.a is now built locally before being
2913 installed. (Thanks to Michael Forney.)
2915 A dependency typo in the 'zdump' rule has been fixed.
2916 (Thanks to Andrew Paprocki.)
2918 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2919 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2921 'make clean' no longer removes 'leapseconds', since it's
2922 host-independent and is part of the distribution.
2924 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2926 Changes affecting documentation and commentary
2928 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2929 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2931 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2932 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2933 longer maintained) and for old advisories. SOFA now does C.
2935 Release 2013g - 2013-09-30 21:08:26 -0700
2937 Changes affecting current and near-future timestamps
2939 Morocco now observes DST from the last Sunday in March to the last
2940 Sunday in October, not April to September respectively. (Thanks
2941 to Steffen Thorsen.)
2943 Changes affecting 'zic'
2945 'zic' now runs on platforms that lack both hard links and symlinks.
2946 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2947 Also, fix some bugs on platforms that lack hard links but have symlinks.
2949 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2950 to predict the far future, fixing a bug introduced in 2013e.
2952 Changes affecting the build procedure
2954 The 'leapseconds' file is again put into the tzdata tarball.
2955 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2956 Matt Burgess and Ian Abbott.) The timestamps of these and other
2957 dependent files in tarballs are adjusted more consistently.
2959 Changes affecting documentation and commentary
2961 The README file is now part of the data tarball as well as the code.
2962 It now states that files are public domain unless otherwise specified.
2963 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2964 Its details about the 1989 release moved to a place of honor near
2968 Release 2013f - 2013-09-24 23:37:36 -0700
2970 Changes affecting near-future timestamps
2972 Tocantins will very likely not observe DST starting this spring.
2973 (Thanks to Steffen Thorsen.)
2975 Jordan will likely stay at UT +03 indefinitely, and will not fall
2978 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2980 Changes affecting API
2982 The types of the global variables 'timezone' and 'altzone' (if present)
2983 have been changed back to 'long'. This is required for 'timezone'
2984 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2985 These variables were originally 'long' in the tz code, but were
2986 mistakenly changed to 'time_t' in 1987; nobody reported the
2987 incompatibility until now. The difference matters on x32, where
2988 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2990 Changes affecting the build procedure
2992 Avoid long strings in leapseconds.awk to work around a mawk bug.
2993 (Thanks to Cyril Baurand.)
2995 Changes affecting documentation and commentary
2997 New file 'NEWS' that contains release notes like this one.
2999 Paraguay's law does not specify DST transition time; 00:00 is customary.
3000 (Thanks to Waldemar Villamayor-Venialbo.)
3002 Minor capitalization fixes.
3004 Changes affecting version-control only
3006 The experimental GitHub repository now contains annotated and
3007 signed tags for recent releases, e.g., '2013e' for Release 2013e.
3008 Releases are tagged starting with 2012e; earlier releases were
3009 done differently, and tags would either not have a simple name or
3010 not exactly match what was released.
3012 'make set-timestamps' is now simpler and a bit more portable.
3015 Release 2013e - 2013-09-19 23:50:04 -0700
3017 Changes affecting near-future timestamps
3019 This year Fiji will start DST on October 27, not October 20.
3020 (Thanks to David Wheeler for the heads-up.) For now, guess that
3021 Fiji will continue to spring forward the Sunday before the fourth
3024 Changes affecting current and future time zone abbreviations
3026 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
3027 time zone abbreviations since 1932. (Thanks to George Ziegler,
3028 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
3029 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
3030 Asia/Makassar, and Asia/Pontianak.
3032 Use ART (UT -03, standard time), rather than WARST (also -03, but
3033 daylight saving time) for San Luis, Argentina since 2009.
3035 Changes affecting Godthåb timestamps after 2037 if version mismatch
3037 Allow POSIX-like TZ strings where the transition time's hour can
3038 range from -167 through 167, instead of the POSIX-required 0
3039 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
3040 new Fiji rules. This is a more-compact way to represent
3041 far-future timestamps for America/Godthab, America/Santiago,
3042 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
3043 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
3044 this change. (Derived from a suggestion by Arthur David Olson.)
3046 Allow POSIX-like TZ strings where daylight saving time is in
3047 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
3048 Argentina Summer Time all year. This supports a more-compact way
3049 to represent the 2013d data for America/Argentina/San_Luis.
3050 Because of the change for San Luis noted above this change does not
3051 affect the current data. (Thanks to Andrew Main (Zefram) for
3052 suggestions that improved this change.)
3054 Where these two TZ changes take effect, there is a minor extension
3055 to the tz file format in that it allows new values for the
3056 embedded TZ-format string, and the tz file format version number
3057 has therefore been increased from 2 to 3 as a precaution.
3058 Version-2-based client code should continue to work as before for
3059 all timestamps before 2038. Existing version-2-based client code
3060 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
3061 files, and typically works in practice even for timestamps after
3062 2037; the only known exception is America/Godthab.
3064 Changes affecting timestamps before 1970
3066 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
3067 some errors before 1947.
3069 Some zones have been turned into links, when they differ from existing
3070 zones only in older data entries that were likely invented or that
3071 differ only in LMT or transitions from LMT. These changes affect
3072 only timestamps before 1943. The affected zones are:
3073 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
3074 America/Grenada, America/Guadeloupe, America/Marigot,
3075 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
3076 America/St_Lucia, America/St_Thomas, America/St_Vincent,
3077 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
3078 confirming that the old Europe/Vaduz zone was wrong and the new
3079 link is better for WWII-era times.)
3081 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
3082 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
3085 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
3086 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
3089 Change the date of the circa-1850 Zurich transition from 1849-09-12
3090 to 1853-07-16, overriding Shanks with data from Messerli about
3091 postal and telegraph time in Switzerland.
3093 Changes affecting time zone abbreviations before 1970
3095 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
3096 as Jakarta was called Batavia back then.
3098 Changes affecting API
3100 The 'zic' command now outputs a dummy transition when far-future
3101 data can't be summarized using a TZ string, and uses a 402-year
3102 window rather than a 400-year window. For the current data, this
3103 affects only the Asia/Tehran file. It does not affect any of the
3104 timestamps that this file represents, so zdump outputs the same
3105 information as before. (Thanks to Andrew Main (Zefram).)
3107 The 'date' command has a new '-r' option, which lets you specify
3108 the integer time to display, a la FreeBSD.
3110 The 'tzselect' command has two new options '-c' and '-n', which lets you
3111 select a zone based on latitude and longitude.
3113 The 'zic' command's '-v' option now warns about constructs that
3114 require the new version-3 binary file format. (Thanks to Arthur
3115 David Olson for the suggestion.)
3117 Support for floating-point time_t has been removed.
3118 It was always dicey, and POSIX no longer requires it.
3119 (Thanks to Eric Blake for suggesting to the POSIX committee to
3120 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
3121 Heninger, Arthur David Olson, and Alois Treindl, for reporting
3122 bugs and elucidating some of the corners of the old floating-point
3125 The signatures of 'offtime', 'timeoff', and 'gtime' have been
3126 changed back to the old practice of using 'long' to represent UT
3127 offsets. This had been inadvertently and mistakenly changed to
3128 'int_fast32_t'. (Thanks to Christos Zoulas.)
3130 The code avoids undefined behavior on integer overflow in some
3131 more places, including gmtime, localtime, mktime and zdump.
3133 Changes affecting the zdump utility
3135 zdump now outputs "UT" when referring to Universal Time, not "UTC".
3136 "UTC" does not make sense for timestamps that predate the introduction
3137 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
3138 for clarifying UT vs UTC.)
3140 Data changes affecting behavior of tzselect and similar programs
3142 Country code BQ is now called the more-common name "Caribbean Netherlands"
3143 rather than the more-official "Bonaire, St Eustatius & Saba".
3145 Remove from zone.tab the names America/Montreal, America/Shiprock,
3146 and Antarctica/South_Pole, as they are equivalent to existing
3147 same-country-code zones for post-1970 timestamps. The data entries for
3148 these names are unchanged, so the names continue to work as before.
3150 Changes affecting code internals
3152 zic -c now runs way faster on 64-bit hosts when given large numbers.
3154 zic now uses vfprintf to avoid allocating and freeing some memory.
3156 tzselect now computes the list of continents from the data,
3157 rather than have it hard-coded.
3159 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
3161 Changes affecting the build procedure
3163 The 'leapseconds' file is now generated automatically from a
3164 new file 'leap-seconds.list', which is a copy of
3165 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
3166 A new source file 'leapseconds.awk' implements this.
3167 The goal is simplification of the future maintenance of 'leapseconds'.
3169 When building the 'posix' or 'right' subdirectories, if the
3170 subdirectory would be a copy of the default subdirectory, it is
3171 now made a symbolic link if that is supported. This saves about
3172 2 MB of file system space.
3174 The links America/Shiprock and Antarctica/South_Pole have been
3175 moved to the 'backward' file. This affects only nondefault builds
3176 that omit 'backward'.
3178 Changes affecting version-control only
3180 .gitignore now ignores 'date'.
3182 Changes affecting documentation and commentary
3184 Changes to the 'tzfile' man page
3186 It now mentions that the binary file format may be extended in
3187 future versions by appending data.
3189 It now refers to the 'zdump' and 'zic' man pages.
3191 Changes to the 'zic' man page
3193 It lists conditions that elicit a warning with '-v'.
3195 It says that the behavior is unspecified when duplicate names
3196 are given, or if the source of one link is the target of another.
3198 Its examples are updated to match the latest data.
3200 The definition of white space has been clarified slightly.
3201 (Thanks to Michael Deckers.)
3203 Changes to the 'Theory' file
3205 There is a new section about the accuracy of the tz database,
3206 describing the many ways that errors can creep in, and
3207 explaining why so many of the pre-1970 timestamps are wrong or
3208 misleading (thanks to Steve Allen, Lester Caine, and Garrett
3209 Wollman for discussions that contributed to this).
3211 The 'Theory' file describes LMT better (this follows a
3212 suggestion by Guy Harris).
3214 It refers to the 2013 edition of POSIX rather than the 2004 edition.
3216 It's mentioned that excluding 'backward' should not affect the
3217 other data, and it suggests at least one zone.tab name per
3218 inhabited country (thanks to Stephen Colebourne).
3220 Some longstanding restrictions on names are documented, e.g.,
3221 'America/New_York' precludes 'America/New_York/Bronx'.
3223 It gives more reasons for the 1970 cutoff.
3225 It now mentions which time_t variants are supported, such as
3226 signed integer time_t. (Thanks to Paul Goyette for reporting
3227 typos in an experimental version of this change.)
3229 (Thanks to Philip Newton for correcting typos in these changes.)
3231 Documentation and commentary is more careful to distinguish UT in
3232 general from UTC in particular. (Thanks to Steve Allen.)
3234 Add a better source for the Zurich 1894 transition.
3235 (Thanks to Pierre-Yves Berger.)
3237 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
3240 Release 2013d - 2013-07-05 07:38:01 -0700
3242 Changes affecting future timestamps:
3244 Morocco's midsummer transitions this year are July 7 and August 10,
3245 not July 9 and August 8. (Thanks to Andrew Paprocki.)
3247 Israel now falls back on the last Sunday of October.
3248 (Thanks to Ephraim Silverberg.)
3250 Changes affecting past timestamps:
3252 Specify Jerusalem's location more precisely; this changes the pre-1880
3255 Changing affecting metadata only:
3257 Fix typos in the entries for country codes BQ and SX.
3259 Changes affecting code:
3261 Rework the code to fix a bug with handling Australia/Macquarie on
3262 32-bit hosts (thanks to Arthur David Olson).
3264 Port to platforms like NetBSD, where time_t can be wider than long.
3266 Add support for testing time_t types other than the system's.
3267 Run 'make check_time_t_alternatives' to try this out.
3268 Currently, the tests fail for unsigned time_t;
3269 this should get fixed at some point.
3271 Changes affecting documentation and commentary:
3273 Deemphasize the significance of national borders.
3275 Update the zdump man page.
3277 Remove obsolete NOID comment (thanks to Denis Excoffier).
3279 Update several URLs and comments in the web pages.
3281 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
3283 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
3286 Release 2013c - 2013-04-19 16:17:40 -0700
3288 Changes affecting current and future timestamps:
3290 Palestine observed DST starting March 29, 2013. (Thanks to
3291 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
3292 with the predicted rules being the last Thursday in March at 24:00
3293 to the first Friday on or after September 21 at 01:00.
3295 Assume that the recent change to Paraguay's DST rules is permanent,
3296 by moving the end of DST to the 4th Sunday in March every year.
3297 (Thanks to Carlos Raúl Perasso.)
3299 Changes affecting past timestamps:
3301 Fix some historical data for Palestine to agree with that of
3302 timeanddate.com, as follows:
3304 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
3307 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
3310 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
3312 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
3314 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
3316 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
3318 Fix times of habitation for Macquarie to agree with the Tasmania
3319 Parks & Wildlife Service history, which indicates that permanent
3320 habitation was 1899-1919 and 1948 on.
3322 Changing affecting metadata only:
3324 Macquarie Island is politically part of Australia, not Antarctica.
3325 (Thanks to Tobias Conradi.)
3327 Sort Macquarie more-consistently with other parts of Australia.
3328 (Thanks to Tim Parenti.)
3331 Release 2013b - 2013-03-10 22:33:40 -0700
3333 Changes affecting current and future timestamps:
3335 Haiti uses US daylight-saving rules this year, and presumably future years.
3336 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
3338 Paraguay will end DST on March 24 this year.
3339 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
3341 Morocco does not observe DST during Ramadan;
3342 try to predict Ramadan in Morocco as best we can.
3343 (Thanks to Erik Homoet for the heads-up.)
3345 Changes affecting commentary:
3347 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
3348 Update URL for Solaris. Mention Internet RFC 6557.
3349 Update Internet RFCs 2445->5545, 2822->5322.
3350 Switch from FTP to HTTP for Internet RFCs.
3353 Release 2013a - 2013-02-27 09:20:35 -0800
3355 Change affecting binary data format:
3357 The zone offset at the end of version-2-format zone files is now
3358 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
3360 Changes affecting current and future timestamps:
3362 Chile's 2013 rules, and we guess rules for 2014 and later, will be
3363 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
3364 (Thanks to Steffen Thorsen and Robert Elz.)
3366 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
3367 (Thanks to Tobias Conradi and Arthur David Olson.)
3369 Many changes affect historical timestamps before 1940.
3370 These were deduced from: Milne J. Civil time. Geogr J. 1899
3371 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
3373 Changes affecting the code:
3375 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
3376 the data). (Thanks to Arthur David Olson.)
3378 Fix localtime bug when time_t is unsigned and data files were generated
3379 by a signed time_t system. (Thanks to Doug Bailey for reporting and
3380 to Arthur David Olson for fixing.)
3382 Allow the email address for bug reports to be set by the packager.
3383 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
3385 Update HTML checking to be compatible with Ubuntu 12.10.
3387 Check that files are a safe subset of ASCII. At some point we may
3388 relax this requirement to a safe subset of UTF-8. Without the
3389 check, some non-UTF-8 encodings were leaking into the distribution.
3393 Restore a comment about copyright notices that was inadvertently deleted.
3394 (Thanks to Arthur David Olson.)
3396 Improve the commentary about which districts observe what times
3397 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.)
3399 Add web page links to tz.js.
3401 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
3404 Release 2012j - 2012-11-12 18:34:49 -0800
3406 Libya moved to CET this weekend, but with DST planned next year.
3407 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
3409 Signatures now have the extension .asc, not .sign, as that's more
3410 standard. (Thanks to Phil Pennock.)
3412 The output of 'zdump --version', and of 'zic --version', now
3413 uses a format that is more typical for --version.
3414 (Thanks to Joseph S. Myers.)
3416 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
3417 now uses tz@iana.org rather than the old elsie address.
3419 zic -v now complains about abbreviations that are less than 3
3420 or more than 6 characters, as per Posix. Formerly, it checked
3421 for abbreviations that were more than 3.
3423 'make public' no longer puts its temporary directory under /tmp,
3424 and uses the just-built zic rather than the system zic.
3426 Various fixes to documentation and commentary.
3429 Release 2012i - 2012-11-03 12:57:09 -0700
3431 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
3433 Linker flags can now be specified via LDFLAGS.
3434 AWK now defaults to 'awk', not 'nawk'.
3435 The shell in tzselect now defaults to /bin/bash, but this can
3436 be overridden by specifying KSHELL.
3437 The main web page now mentions the unofficial GitHub repository.
3438 (Thanks to Mike Frysinger.)
3440 Tarball signatures can now be built by running 'make signatures'.
3441 There are also new makefile rules 'tarballs', 'check_public', and
3442 separate makefile rules for each tarball and signature file.
3443 A few makefile rules are now more portable to strict POSIX.
3445 The main web page now lists the canonical IANA URL.
3448 Release 2012h - 2012-10-26 22:49:10 -0700
3450 Bahia no longer has DST. (Thanks to Kelley Cook.)
3452 Tocantins has DST. (Thanks to Rodrigo Severo.)
3454 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
3456 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
3460 More C modernization, except that at Arthur David Olson's suggestion
3461 the instances of 'register' were kept.
3464 Release 2012g - 2012-10-17 20:59:45 -0700
3466 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
3468 Palestine fall 2012. (Thanks to Steffen Thorsen.)
3472 To attack the version-number problem, this release ships the file
3473 'Makefile' (which contains the release number) in both the tzcode and
3474 the tzdata tarballs. The two Makefiles are identical, and should be
3475 identical in any matching pair of tarballs, so it shouldn't matter
3476 which order you extract the tarballs. Perhaps we can come up with a
3477 better version-number scheme at some point; this scheme does have the
3478 virtue of not adding more files.
3481 Release 2012f - 2012-09-12 23:17:03 -0700
3483 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
3484 20 this year. (Thanks to Steffen Thorsen.)
3487 Release 2012e - 2012-08-02 20:44:55 -0700
3489 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
3490 (Thanks to Steffen Thorsen.)
3492 * Use a single version number for both code and data.
3494 * .gitignore: New file.
3496 * Remove trailing white space.
3499 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
3501 Changes for Morocco's timestamps, which take effect in a couple of
3502 hours, along with infrastructure changes to accommodate how the tz
3503 code and data are released on IANA.
3506 Release data2012c - 2012-03-27 12:17:25 -0400
3509 Summer time changes for Morocco (to start late April 2012)
3512 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
3515 Haiti following US/Canada rules for 2012 (and we're assuming,
3516 for now anyway, for the future).
3519 Release 2012b - 2012-03-02 12:29:15 +0700
3521 There is just one change to tzcode2012b (compared with 2012a):
3522 the Makefile that was accidentally included with 2012a has been
3523 replaced with the version that should have been there, which is
3524 identical with the previous version (from tzcode2011i).
3526 There are just two changes in tzdata2012b compared with 2012a.
3528 Most significantly, summer time in Cuba has been delayed 3 weeks
3529 (now starts April 1 rather than March 11). Since Mar 11 (the old start
3530 date, as listed in 2012a) is just a little over a week away, this
3533 Less importantly, an excess tab in one of the changes in zone.tab
3534 in 2012a has been removed.
3537 Release 2012a - 2012-03-01 18:28:10 +0700
3539 The changes in tzcode2012a (compared to the previous version, 2011i)
3540 are entirely to the README and tz-art.htm and tz-link.htm files, if
3541 none of those concern you, you can ignore the code update. The changes
3542 reflect the changed addresses for the mailing list and the code and
3543 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
3544 has been added to tz-link.htm).
3546 In tzdata2012a (compared to the previous release, which was 2011n)
3547 the major changes are:
3548 Chile 2011/2012 and 2012/2013 summer time date adjustments.
3549 Falkland Islands onto permanent summer time (we're assuming for the
3550 foreseeable future, though 2012 is all we're fairly certain of.)
3551 Armenia has abolished Summer Time.
3552 Tokelau jumped the International Date Line back last December
3553 (just the same as their near neighbour, Samoa).
3554 America/Creston is a new zone for a small area of British Columbia
3555 There will be a leapsecond 2012-06-30 23:59:60 UTC.
3557 Other minor changes are:
3558 Corrections to 1918 Canadian summer time end dates.
3559 Updated URL for UK time zone history (in comments)
3560 A few typos in Le Corre's list of free French place names (comments)
3563 Release data2011n - 2011-10-30 14:57:54 +0700
3565 There are three changes of note - most urgently, Cuba (America/Havana)
3566 has extended summer time by two weeks, now to end on Nov 13, rather than
3567 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
3568 (Europe/Tiraspol) decided not to split from the rest of Moldova after
3569 all, and consequently that zone has been removed (again) and reinstated
3570 in the "backward" file as a link to Europe/Chisinau. And third, the
3571 end date for Fiji's summer time this summer was moved forward from the
3572 earlier planned Feb 26, to Jan 22.
3574 Apart from that, Moldova (MD) returns to a single entry in zone.tab
3575 (and the incorrect syntax that was in the 2011m version of that file
3576 is so fixed - it would have been fixed in a different way had this
3577 change not happened - that's the "missing" sccs version id).
3580 Release data2011m - 2011-10-24 21:42:16 +0700
3582 In particular, the typos in comments in the data (2011-11-17 should have
3583 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
3584 Tim Parenti noted) have been fixed, and the change for Ukraine has been
3585 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
3586 Tim Parenti, and also Denys Gavrysh)
3588 In addition, I added Europe/Tiraspol to zone.tab.
3590 This time, all the files have new version numbers... (including the files
3591 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
3592 version numbers there...)
3595 Release data2011l - 2011-10-10 11:15:43 +0700
3597 There are just 2 changes that cause different generated tzdata files from
3598 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
3599 is included, but commented out. Compared with the diff I sent out last week,
3600 this version also includes attributions for the sources for the changes
3601 (in much the same format as ado used, but the html tags have not been
3602 checked, verified, or used in any way at all, so if there are errors there,
3603 please let me know.)
3606 Release data2011k - 2011-09-20 17:54:03 -0400
3611 Release data2011j - 2011-09-12 09:22:49 -0400
3613 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
3614 Tanzania); there are also two spelling corrections to comments in
3615 the australasia file (with thanks to Christos Zoulas).
3618 Release 2011i - 2011-08-29 05:56:32 -0400
3623 Release data2011h - 2011-06-15 18:41:48 -0400
3625 Russia and Curaçao changes
3628 Release 2011g - 2011-04-25 09:07:22 -0400
3630 update the rules for Egypt to reflect its abandonment of DST this year
3633 Release 2011f - 2011-04-06 17:14:53 -0400
3638 Release 2011e - 2011-03-31 16:04:38 -0400
3640 Morocco, Chile, and tz-link changes
3643 Release 2011d - 2011-03-14 09:18:01 -0400
3645 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
3648 Release 2011c - 2011-03-07 09:30:09 -0500
3650 These do affect current timestamps in Chile and Annette Island, Canada.
3653 Release 2011b - 2011-02-07 08:44:50 -0500
3658 Release 2011a - 2011-01-24 10:30:16 -0500
3663 Release data2010o - 2010-11-01 09:18:23 -0400
3665 change to the end of DST in Fiji in 2011
3668 Release 2010n - 2010-10-25 08:19:17 -0400
3673 Release 2010m - 2010-09-27 09:24:48 -0400
3675 Hong Kong, Vostok, and zic.c changes
3678 Release 2010l - 2010-08-16 06:57:25 -0400
3683 Release 2010k - 2010-07-26 10:42:27 -0400
3688 Release 2010j - 2010-05-10 09:07:48 -0400
3690 changes for Bahía de Banderas and for version naming
3693 Release data2010i - 2010-04-16 18:50:45 -0400
3695 the end of DST in Morocco on 2010-08-08
3698 Release data2010h - 2010-04-05 09:58:56 -0400
3703 Release data2010g - 2010-03-24 11:14:53 -0400
3708 Release 2010f - 2010-03-22 09:45:46 -0400
3713 Release data2010e - 2010-03-08 14:24:27 -0500
3715 corrects the Dhaka bug found by Danvin Ruangchan
3718 Release data2010d - 2010-03-06 07:26:01 -0500
3723 Release 2010c - 2010-03-01 09:20:58 -0500
3725 changes including KRE's suggestion for earlier initialization of
3726 "goahead" and "goback" structure elements
3729 Release code2010a - 2010-02-16 10:40:04 -0500
3734 Release data2010b - 2010-01-20 12:37:01 -0500
3739 Release data2010a - 2010-01-18 08:30:04 -0500
3744 Release data2009u - 2009-12-26 08:32:28 -0500
3746 changes to DST in Bangladesh
3749 Release 2009t - 2009-12-21 13:24:27 -0500
3754 Release data2009s - 2009-11-14 10:26:32 -0500
3756 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3759 Release 2009r - 2009-11-09 10:10:31 -0500
3761 "antarctica" and "tz-link.htm" changes
3764 Release 2009q - 2009-11-02 09:12:40 -0500
3766 with two corrections as reported by Eric Muller and Philip Newton
3769 Release data2009p - 2009-10-23 15:05:27 -0400
3771 Argentina (including San Luis) changes (with the correction from
3775 Release data2009o - 2009-10-14 16:49:38 -0400
3777 Samoa (commentary only), Pakistan, and Bangladesh changes
3780 Release data2009n - 2009-09-22 15:13:38 -0400
3782 added commentary for Argentina and a change to the end of DST in
3786 Release data2009m - 2009-09-03 10:23:43 -0400
3788 Samoa and Palestine changes
3791 Release data2009l - 2009-08-14 09:13:07 -0400
3793 Samoa (comments only) and Egypt
3796 Release 2009k - 2009-07-20 09:46:08 -0400
3801 Release data2009j - 2009-06-15 06:43:59 -0400
3803 Bangladesh change (with a short turnaround since the DST change is
3807 Release 2009i - 2009-06-08 09:21:22 -0400
3809 updating for DST in Bangladesh this year
3812 Release 2009h - 2009-05-26 09:19:14 -0400
3817 Release data2009g - 2009-04-20 16:34:07 -0400
3822 Release data2009f - 2009-04-10 11:00:52 -0400
3824 correct DST in Pakistan
3827 Release 2009e - 2009-04-06 09:08:11 -0400
3832 Release 2009d - 2009-03-23 09:38:12 -0400
3834 Morocco, Tunisia, Argentina, and American Astronomical Society changes
3837 Release data2009c - 2009-03-16 09:47:51 -0400
3839 change to the start of Cuban DST
3842 Release 2009b - 2009-02-09 11:15:22 -0500
3847 Release 2009a - 2009-01-21 10:09:39 -0500
3852 Release data2008i - 2008-10-21 12:10:25 -0400
3854 southamerica and zone.tab files, with Argentina DST rule changes and
3855 United States zone reordering and recommenting
3858 Release 2008h - 2008-10-13 07:33:56 -0400
3863 Release 2008g - 2008-10-06 09:03:18 -0400
3865 Fix a broken HTML anchor and update Brazil's DST transitions;
3866 there's also a slight reordering of information in tz-art.htm.
3869 Release data2008f - 2008-09-09 22:33:26 -0400
3874 Release 2008e - 2008-07-28 14:11:17 -0400
3876 changes by Arthur David Olson and Jesper Nørgaard Welen
3879 Release data2008d - 2008-07-07 09:51:38 -0400
3881 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3884 Release data2008c - 2008-05-19 17:48:03 -0400
3886 Pakistan, Morocco, and Mongolia
3889 Release data2008b - 2008-03-24 08:30:59 -0400
3891 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3895 Release 2008a - 2008-03-08 05:42:16 -0500
3900 Release 2007k - 2007-12-31 10:25:22 -0500
3902 most importantly, changes to the "southamerica" file based on
3903 Argentina's readoption of daylight saving time
3906 Release 2007j - 2007-12-03 09:51:01 -0500
3908 1. eliminate the "P" (parameter) macro;
3910 2. the "noncontroversial" changes circulated on the time zone
3911 mailing list (less the changes to "logwtmp.c");
3913 3. eliminate "too many transition" errors when "min" is used in time
3916 4. changes by Paul Eggert (including updated information for Venezuela).
3919 Release data2007i - 2007-10-30 10:28:11 -0400
3921 changes for Cuba and Syria
3924 Release 2007h - 2007-10-01 10:05:51 -0400
3926 changes by Paul Eggert, as well as an updated link to the ICU
3927 project in tz-link.htm
3930 Release 2007g - 2007-08-20 10:47:59 -0400
3932 changes by Paul Eggert
3934 The "leapseconds" file has been updated to incorporate the most
3935 recent International Earth Rotation and Reference Systems Service
3938 There's an addition to tz-art.htm regarding the television show "Medium".
3941 Release 2007f - 2007-05-07 10:46:46 -0400
3943 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3946 changes to zic.c to allow hour values greater than 24 (along with
3947 Paul's improved time value overflow checking)
3950 Release 2007e - 2007-04-02 10:11:52 -0400
3952 Syria and Honduras changes by Paul Eggert
3954 zic.c variable renaming changes by Arthur David Olson
3957 Release 2007d - 2007-03-20 08:48:30 -0400
3959 changes by Paul Eggert
3961 the elimination of white space at the ends of lines
3964 Release 2007c - 2007-02-26 09:09:37 -0500
3966 changes by Paul Eggert
3969 Release 2007b - 2007-02-12 09:34:20 -0500
3971 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3973 changes to the commentary in "leapseconds" reflecting the IERS
3974 announcement that there is to be no positive leap second at the end
3978 Release 2007a - 2007-01-08 12:28:29 -0500
3980 changes by Paul Eggert
3982 Derick Rethan's Asmara change
3984 Oscar van Vlijmen's Easter Island local mean time change
3986 symbolic link changes
3989 Release 2006p - 2006-11-27 08:54:27 -0500
3991 changes by Paul Eggert
3994 Release 2006o - 2006-11-06 09:18:07 -0500
3996 changes by Paul Eggert
3999 Release 2006n - 2006-10-10 11:32:06 -0400
4001 changes by Paul Eggert
4004 Release 2006m - 2006-10-02 15:32:35 -0400
4006 changes for Uruguay, Palestine, and Egypt by Paul Eggert
4008 (minimalist) changes to zic.8 to clarify "until" information
4011 Release data2006l - 2006-09-18 12:58:11 -0400
4013 Paul's best-effort work on this coming weekend's Egypt time change
4016 Release 2006k - 2006-08-28 12:19:09 -0400
4018 changes by Paul Eggert
4021 Release 2006j - 2006-08-21 09:56:32 -0400
4023 changes by Paul Eggert
4026 Release code2006i - 2006-08-07 12:30:55 -0400
4030 Ken Pizzini's conversion script
4033 Release code2006h - 2006-07-24 09:19:37 -0400
4035 adds public domain notices to four files
4037 includes a fix for transition times being off by a second
4039 adds a new recording to the "arts" file (information courtesy Colin Bowern)
4042 Release 2006g - 2006-05-08 17:18:09 -0400
4044 northamerica changes by Paul Eggert
4047 Release 2006f - 2006-05-01 11:46:00 -0400
4049 a missing version number problem is fixed (with thanks to Bradley
4050 White for catching the problem)
4053 Release 2006d - 2006-04-17 14:33:43 -0400
4055 changes by Paul Eggert
4057 added new items to tz-arts.htm that were found by Paul
4060 Release 2006c - 2006-04-03 10:09:32 -0400
4062 two sets of data changes by Paul Eggert
4064 a fencepost error fix in zic.c
4066 changes to zic.c and the "europe" file to minimize differences
4067 between output produced by the old 32-bit zic and the new 64-bit
4071 Release 2006b - 2006-02-20 10:08:18 -0500
4072 [tz32code2006b + tz64code2006b + tzdata2006b]
4076 All SCCS IDs were bumped to "8.1" for this release.
4079 Release 2006a - 2006-01-30 08:59:31 -0500
4081 changes by Paul Eggert (in particular, Indiana time zone moves)
4083 an addition to the zic manual page to describe how special-case
4084 transitions are handled
4087 Release 2005r - 2005-12-27 09:27:13 -0500
4089 Canadian changes by Paul Eggert
4091 They also add "<pre>" directives to time zone data files and reflect
4092 changes to warning message logic in "zdump.c" (but with calls to
4093 "gettext" kept unbundled at the suggestion of Ken Pizzini).
4096 Release 2005q - 2005-12-13 09:17:09 -0500
4098 Nothing earth-shaking here:
4099 1. Electronic mail addresses have been removed.
4100 2. Casts of the return value of exit have been removed.
4101 3. Casts of the argument of is.* macros have been added.
4102 4. Indentation in one section of zic.c has been fixed.
4103 5. References to dead URLs in the data files have been dealt with.
4106 Release 2005p - 2005-12-05 10:30:53 -0500
4108 "systemv", "tz-link.htm", and "zdump.c" changes
4109 (less the casts of arguments to the is* macros)
4112 Release 2005o - 2005-11-28 10:55:26 -0500
4114 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
4116 zdump.c lint fixes by Arthur David Olson
4119 Release 2005n - 2005-10-03 09:44:09 -0400
4121 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
4125 Release 2005m - 2005-08-29 12:15:40 -0400
4127 changes by Paul Eggert (with a small tweak to the tz-art change)
4129 a declaration of an unused variable has been removed from zdump.c
4132 Release 2005l - 2005-08-22 12:06:39 -0400
4134 changes by Paul Eggert
4136 overflow/underflow checks by Arthur David Olson, minus changes to
4137 the "Theory" file about the pending addition of 64-bit data (I grow
4138 less confident of the changes being accepted with each passing day,
4139 and the changes no longer increase the data files nine-fold--there's
4140 less than a doubling in size by my local Sun's reckoning)
4143 Release 2005k - 2005-07-14 14:14:24 -0400
4145 The "leapseconds" file has been edited to reflect the recently
4146 announced leap second at the end of 2005.
4148 I've also deleted electronic mail addresses from the files as an
4152 Release 2005j - 2005-06-13 14:34:13 -0400
4154 These reflect changes to limit the length of time zone abbreviations
4155 and the characters used in those abbreviations.
4157 There are also changes to handle POSIX-style "quoted" timezone
4158 environment variables.
4160 The changes were circulated on the time zone mailing list; the only
4161 change since then was the removal of a couple of minimum-length of
4162 abbreviation checks.
4165 Release data2005i - 2005-04-21 15:04:16 -0400
4167 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
4170 Release 2005h - 2005-04-04 11:24:47 -0400
4172 changes by Paul Eggert
4174 minor changes to Makefile and zdump.c to produce more useful output
4175 when doing a "make typecheck"
4178 Release 2005g - 2005-03-14 10:11:21 -0500
4180 changes by Paul Eggert (a change to current DST rules in Uruguay and
4181 an update to a link to time zone software)
4184 Release 2005f - 2005-03-01 08:45:32 -0500
4186 data and documentation changes by Paul Eggert
4189 Release 2005e - 2005-02-10 15:59:44 -0500
4194 Release code2005d - 2005-01-31 09:21:47 -0500
4196 make zic complain about links to links if the -v flag is used
4198 have "make public" do more code checking
4200 add an include to "localtime.c" for the benefit of gcc systems
4203 Release 2005c - 2005-01-17 18:36:29 -0500
4205 get better results when mktime runs on a system where time_t is double
4207 changes to the data files (most importantly to Paraguay)
4210 Release 2005b - 2005-01-10 09:19:54 -0500
4212 Get localtime and gmtime working on systems with exotic time_t types.
4214 Update the leap second commentary in the "leapseconds" file.
4217 Release 2005a - 2005-01-01 13:13:44 -0500
4222 Release code2004i - 2004-12-14 13:42:58 -0500
4224 Deal with systems where time_t is unsigned.
4227 Release code2004h - 2004-12-07 11:40:18 -0500
4229 64-bit-time_t changes
4232 Release 2004g - 2004-11-02 09:06:01 -0500
4234 update to Cuba (taking effect this weekend)
4236 other changes by Paul Eggert
4238 correction of the spelling of Oslo
4240 changed versions of difftime.c and private.h
4243 Release code2004f - 2004-10-21 10:25:22 -0400
4245 Cope with wide-ranging tm_year values.
4248 Release 2004e - 2004-10-11 14:47:21 -0400
4250 Brazil/Argentina/Israel changes by Paul Eggert
4252 changes to tz-link.htm by Paul
4254 one small fix to Makefile
4257 Release 2004d - 2004-09-22 08:27:29 -0400
4259 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
4262 Release 2004c - 2004-08-11 12:06:26 -0400
4264 asctime-related changes
4266 (variants of) some of the documentation changes suggested by Paul Eggert
4269 Release 2004b - 2004-07-19 14:33:35 -0400
4271 data changes by Paul Eggert - most importantly, updates for Argentina
4274 Release 2004a - 2004-05-27 12:00:47 -0400
4276 changes by Paul Eggert
4278 Handle DST transitions that occur at the end of a month in some
4279 years but at the start of the following month in other years.
4281 Add a copy of the correspondence that's the basis for claims about
4282 DST in the Navajo Nation.
4285 Release 2003e - 2003-12-15 09:36:47 -0500
4287 changes by Arthur David Olson (primarily code changes)
4289 changes by Paul Eggert (primarily data changes)
4291 minor changes to "Makefile" and "northamerica" (in the latter case,
4292 optimization of the "Toronto" rules)
4295 Release 2003d - 2003-10-06 09:34:44 -0400
4297 changes by Paul Eggert
4300 Release 2003c - 2003-09-16 10:47:05 -0400
4302 Fix bad returns in zic.c's inleap function.
4303 Thanks to Bradley White for catching the problem!
4306 Release 2003b - 2003-09-16 07:13:44 -0400
4308 Add a "--version" option (and documentation) to the zic and zdump commands.
4310 changes to overflow/underflow checking in zic
4312 a localtime typo fix.
4314 Update the leapseconds and tz-art.htm files.
4317 Release 2003a - 2003-03-24 09:30:54 -0500
4319 changes by Paul Eggert
4321 a few additions and modifications to the tz-art.htm file
4324 Release 2002d - 2002-10-15 13:12:42 -0400
4326 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
4328 There's also a new time zone quote in "tz-art.htm".
4331 Release 2002c - 2002-04-04 11:55:20 -0500
4333 changes by Paul Eggert
4335 Change zic.c to avoid creating symlinks to files that don't exist.
4338 Release 2002b - 2002-01-28 12:56:03 -0500
4340 [These change notes are for Release 2002a, which was corrupted.
4341 2002b was a corrected version of 2002a.]
4343 changes by Paul Eggert
4345 Update the "leapseconds" file to note that there'll be no leap
4346 second at the end of June, 2002.
4348 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
4350 Change to "difftime.c" to avoid sizeof problems.
4353 Release 2001d - 2001-10-09 13:31:32 -0400
4355 changes by Paul Eggert
4358 Release 2001c - 2001-06-05 13:59:55 -0400
4360 changes by Paul Eggert and Andrew Brown
4363 Release 2001b - 2001-04-05 16:44:38 -0400
4365 changes by Paul Eggert (modulo jnorgard's typo fix)
4367 tz-art.htm has been HTMLified.
4370 Release 2001a - 2001-03-13 12:57:44 -0500
4372 changes by Paul Eggert
4374 An addition to the "leapseconds" file: comments with the text of the
4375 latest IERS leap second notice.
4377 Trailing white space has been removed from data file lines, and
4378 repeated spaces in "Rule Jordan" lines in the "asia" file have been
4382 Release 2000h - 2000-12-14 15:33:38 -0500
4384 changes by Paul Eggert
4386 one typo fix in the "art" file
4388 With providence, this is the last update of the millennium.
4391 Release 2000g - 2000-10-10 11:35:22 -0400
4393 changes by Paul Eggert
4395 correction of John Mackin's name submitted by Robert Elz
4397 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
4398 Emmy Awards broadcast.
4401 Release 2000f - 2000-08-10 09:31:58 -0400
4403 changes by Paul Eggert
4405 Added information in "tz-art.htm" on a Seinfeld reference to DST.
4407 Error checking and messages in the "yearistype" script have been
4411 Release 2000e - 2000-07-31 09:27:54 -0400
4413 data changes by Paul Eggert
4415 a change to the default value of the defined constant HAVE_STRERROR
4417 the addition of a Dave Barry quote on DST to the tz-arts file
4420 Release 2000d - 2000-04-20 15:43:04 -0400
4422 changes to the documentation and code of strftime for C99 conformance
4424 a bug fix for date.c
4426 These are based on (though modified from) changes by Paul Eggert.
4429 Release 2000c - 2000-03-04 10:31:43 -0500
4431 changes by Paul Eggert
4434 Release 2000b - 2000-02-21 12:16:29 -0500
4436 changes by Paul Eggert and Joseph Myers
4438 modest tweaks to the tz-art.htm and tz-link.htm files
4441 Release 2000a - 2000-01-18 09:21:26 -0500
4443 changes by Paul Eggert
4445 The two hypertext documents have also been renamed.
4448 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
4450 Paul Eggert's changes
4452 additions to the "zic" manual page and the "Arts.htm" file
4455 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
4460 Release data1999h - 1999-10-07 03:50:29 -0400
4462 changes by Paul Eggert to "europe" (most importantly, fixing
4463 Lithuania and Estonia)
4466 Release 1999g - 1999-09-28 11:06:18 -0400
4468 data changes by Paul Eggert (most importantly, the change for
4469 Lebanon that buys correctness for this coming Sunday)
4471 The "code" file contains changes to "Makefile" and "checktab.awk" to
4472 allow better checking of time zone files before they are published.
4475 Release 1999f - 1999-09-23 09:48:14 -0400
4477 changes by Arthur David Olson and Paul Eggert
4480 Release 1999e - 1999-08-17 15:20:54 -0400
4482 changes circulated by Paul Eggert, although the change to handling
4483 of DST-specifying timezone names has been commented out for now
4484 (search for "XXX" in "localtime.c" for details). These files also
4485 do not make any changes to the start of DST in Brazil.
4487 In addition to Paul's changes, there are updates to "Arts.htm" and
4491 Release 1999d - 1999-03-30 11:31:07 -0500
4493 changes by Paul Eggert
4495 The Makefile's "make public" rule has also been changed to do a test
4496 compile of each individual time zone data file (which should help
4497 avoid problems such as the one we had with Nicosia).
4500 Release 1999c - 1999-03-25 09:47:47 -0500
4502 changes by Paul Eggert, most importantly the change for Chile.
4505 Release 1999b - 1999-02-01 17:51:44 -0500
4507 changes by Paul Eggert
4509 code changes (suggested by Mani Varadarajan, mani at be.com) for
4510 correct handling of symbolic links when building using a relative directory
4512 code changes to generate correct messages for failed links
4514 updates to the URLs in Arts.htm
4517 Release 1999a - 1999-01-19 16:20:29 -0500
4519 error message internationalizations and corrections in zic.c and
4520 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
4524 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
4526 changes for Brazil, Chile, and Germany
4528 support for use of "24:00" in the input files for the time zone compiler
4531 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
4533 changes by Paul Eggert
4535 correction to a define in the "private.h" file
4538 Release data1998g - 1998-08-11 03:28:35 -0000
4539 [tzdata1998g.tar.gz is missing!]
4541 Lithuanian change provided by mgedmin at pub.osf.it
4543 Move creation of the GMT link with Etc/GMT to "etcetera" (from
4544 "backward") to ensure that the GMT file is created even where folks
4545 don't want the "backward" links (as suggested by Paul Eggert).
4548 Release data1998f - 1998-07-20 13:50:00 -0000
4549 [tzdata1998f.tar.gz is missing!]
4551 Update the "leapseconds" file to include the newly-announced
4552 insertion at the end of 1998.
4555 Release code1998f - 1998-06-01 10:18:31 -0400
4557 addition to localtime.c by Guy Harris
4560 Release 1998e - 1998-05-28 09:56:26 -0400
4562 The Makefile is changed to produce zoneinfo-posix rather than
4563 zoneinfo/posix, and to produce zoneinfo-leaps rather than
4566 data changes by Paul Eggert
4568 changes from Guy Harris to provide asctime_r and ctime_r
4570 A usno1998 file (substantially identical to usno1997) has been added.
4573 Release 1998d - 1998-05-14 11:58:34 -0400
4575 changes to comments (in particular, elimination of references to CIA maps).
4576 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
4577 where changes occur.
4580 Release 1998c - 1998-02-28 12:32:26 -0500
4582 changes by Paul Eggert (save the "French correction," on which I'll
4583 wait for the dust to settle)
4587 changes and additions to Arts.htm
4590 Release 1998b - 1998-01-17 14:31:51 -0500
4592 URL cleanups and additions
4595 Release 1998a - 1998-01-13 12:37:35 -0500
4597 changes by Paul Eggert
4600 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
4602 changes by Paul Eggert, with minor modifications from Arthur David
4603 Olson to make the files more browser friendly
4606 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
4608 minor changes to put "TZif" at the start of each timezone information file
4610 a rule has also been added to the Makefile so you can
4612 to just recompile the zone information files (rather than doing a
4613 full "make install" with its other effects).
4616 Release data1997i - 1997-10-07 08:45:38 -0400
4618 changes to Africa by Paul Eggert
4621 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
4623 corrections for Uruguay (and other locations)
4625 Arthur David Olson's simple-minded fix allowing mktime to both
4626 correctly handle leap seconds and correctly handle tm_sec values
4627 upon which arithmetic has been performed.
4630 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
4632 Paul Eggert's updates
4634 a small change to a function prototype;
4636 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
4637 include information on Around the World in Eighty Days.
4640 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
4642 fixes to zic's error handling
4644 changes inspired by the item circulated on Slovenia
4646 The description of Web resources has been HTMLified for browsing
4649 A new piece of tz-related music has been added to the "Music" file.
4652 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
4654 Paul Eggert's latest suggestions
4657 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
4659 changes to "zic.c" to correct performance of the "-s" option
4661 a new file "usno1997"
4664 Release data1997c - 1997-03-04 09:58:18 -0500
4669 Release 1997b - 1997-02-27 18:34:19 -0500
4671 The data file incorporates the 1997 leap second.
4673 The code file incorporates Arthur David Olson's take on the
4674 zic/multiprocessor/directory-creation situation.
4677 Release 1997a - 1997-01-21 09:11:10 -0500
4679 Paul Eggert's Antarctica (and other changes)
4681 Arthur David Olson finessed the "getopt" issue by checking against
4682 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4683 is returned while SunOS 5.5's manual says EOF is returned).
4686 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4688 Paul Eggert's latest changes
4691 Release code1996n - 1996-12-16 09:42:02 -0500
4693 link snapping fix from Bruce Evans (via Garrett Wollman)
4696 Release data1996m - 1996-11-24 02:37:34 -0000
4697 [tzdata1996m.tar.gz is missing!]
4699 Paul Eggert's batch of changes
4702 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4704 No functional changes here; the files have simply been changed to
4705 make more use of ISO style dates in comments. The names of the above
4706 files now include the year in full.
4709 Release code96l - 1996-09-08 17:12:20 -0400
4711 tzcode96k was missing a couple of pieces.
4714 Release 96k - 1996-09-08 16:06:22 -0400
4716 the latest round of changes from Paul Eggert
4718 the recent Year 2000 material
4721 Release code96j - 1996-07-30 13:18:53 -0400
4723 Set sp->typecnt as suggested by Timothy Patrick Murphy.
4726 Release code96i - 1996-07-27 20:11:35 -0400
4728 Paul's suggested patch for strftime %V week numbers
4731 Release data96i - 1996-07-01 18:13:04 -0400
4733 "northamerica" and "europe" changes by Paul Eggert
4736 Release code96h - 1996-06-05 08:02:21 -0400
4738 fix for handling transitions specified in Universal Time
4740 Some "public domain" notices have also been added.
4743 Release code96g - 1996-05-16 14:00:26 -0400
4745 fix for the simultaneous-DST-and-zone-change challenge
4748 Release data96h - 1996-05-09 17:40:51 -0400
4750 changes by Paul Eggert
4753 Release code96f-data96g - 1996-05-03 03:09:59 -0000
4754 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4756 The changes get us some of the way to fixing the problems noted in Paul
4757 Eggert's letter yesterday (in addition to a few others). The approach
4758 has been to make zic a bit smarter about figuring out what time zone
4759 abbreviations apply just after the time specified in the "UNTIL" part
4760 of a zone line. Putting the smarts in zic means avoiding having
4761 transition times show up in both "Zone" lines and "Rule" lines, which
4762 in turn avoids multiple transition time entries in time zone files.
4763 (This also makes the zic input files such as "europe" a bit shorter and
4764 should ease maintenance.)
4767 Release data96f - 1996-04-19 19:20:03 -0000
4768 [tzdata96f.tar.gz is missing!]
4770 The only changes are to the "northamerica" file; the time zone
4771 abbreviation for Denver is corrected to MST (and MDT), and the
4772 comments for Mexico have been updated.
4775 Release data96e - 1996-03-19 17:37:26 -0500
4777 Proposals by Paul Eggert, in particular the Portugal change that
4778 comes into play at the end of this month.
4781 Release data96d - 1996-03-18 20:49:39 -0500
4786 Release code96e - 1996-02-29 15:43:27 -0000
4787 [tzcode96e.tar.gz is missing!]
4789 internationalization changes and the fix to the documentation for strftime
4792 Release code96d-data96c - 1996-02-12 11:05:27 -0500
4794 The "code" file simply updates Bob Kridle's electronic address.
4796 The "data" file updates rules for Mexico.
4799 Release data96b - 1996-01-27 15:44:42 -0500
4804 Release code96c - 1996-01-16 16:58:15 -0500
4806 leap-year streamlining and binary-search changes
4811 Release code96b - 1996-01-10 20:42:39 -0500
4813 fixes and enhancements from Paul Eggert, including code that
4814 emulates the behavior of recent versions of the SunOS "date"
4818 Release 96a - 1996-01-06 09:08:24 -0500
4822 fixes to strftime.c for correct ISO 8601 week number generation,
4823 plus support for two new formats ('G' and 'g') to give ISO 8601 year
4824 numbers (which are not necessarily the same as calendar year numbers)
4827 Release code95i-data95m - 1995-12-21 12:46:47 -0500
4829 The latest revisions from Paul Eggert are included, the usno1995
4830 file has been updated, and a new file ("WWW") covering useful URLs
4834 Release code95h-data95l - 1995-12-19 18:10:12 -0500
4836 A simplification of a macro definition, a change to data for Sudan,
4837 and (for last minute shoppers) notes in the "Music" file on the CD
4841 Release code95g-data95k - 1995-10-30 10:32:47 -0500
4843 (slightly reformatted) 8-bit-clean proposed patch
4845 minor patch: US/Eastern -> America/New_York
4847 snapshot of the USNO's latest data ("usno1995")
4849 some other minor cleanups
4852 Release code95f-data95j - 1995-10-28 21:01:34 -0000
4853 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4857 support for 64-bit time_t's
4859 optimization in localtime.c
4862 Release code95e - 1995-10-13 13:23:57 -0400
4864 the mktime change to scan from future to past when trying to find time zone
4868 Release data95i - 1995-09-26 10:43:26 -0400
4870 For Canada/Central, guess that the Sun customer's "one week too
4871 early" was just a approximation, and the true error is one month
4872 too early. This is consistent with the rest of Canada.
4875 Release data95h - 1995-09-21 11:26:48 -0400
4877 latest changes from Paul Eggert
4880 Release code95d - 1995-09-14 11:14:45 -0400
4882 the addition of a "Music" file, which documents four recorded
4883 versions of the tune "Save That Time".
4886 Release data95g - 1995-09-01 17:21:36 -0400
4888 "yearistype" correction
4891 Release data95f - 1995-08-28 20:46:56 -0400
4893 Paul Eggert's change to the australasia file
4896 Release data95e - 1995-07-08 18:02:34 -0400
4898 The only change is a leap second at the end of this year.
4899 Thanks to Bradley White for forwarding news on the leap second.
4902 Release data95d - 1995-07-03 13:26:22 -0400
4904 Paul Eggert's changes
4907 Release data95c - 1995-07-02 19:19:28 -0400
4909 changes to "asia", "backward", "europe", and "southamerica"
4910 (read: northamericacentrics need not apply)
4913 Release code95c - 1995-03-13 14:00:46 -0500
4915 one-line fix for sign extension problems in detzcode
4918 Release 95b - 1995-03-04 11:22:38 -0500
4920 Minor changes in both:
4922 The "code" file contains a workaround for the lack of "unistd.h" in
4923 Microsoft C++ version 7.
4925 The "data" file contains a fixed "Link" for America/Shiprock.
4928 Release 94h - 1994-12-10 12:51:14 -0500
4932 * incorporate the changes to "zdump" and "date" to make changes to
4933 the "TZ" environment variable permanent;
4935 * incorporate the table changes by Paul Eggert;
4937 * include (and document) support for universal time specifications in
4938 data files - but do not (yet) include use of this feature in the
4941 Think of this as "TZ Classic" - the software has been set up not to break if
4942 universal time shows up in its input, and data entries have been
4943 left as is so as not to break existing implementations.
4946 Release data94f - 1994-08-20 12:56:09 -0400
4948 (with thanks!) the latest data updates from Paul Eggert
4951 Release data94e - 1994-06-04 13:13:53 -0400
4956 Release code94g - 1994-05-05 12:14:07 -0400
4958 fix missing "optind.c" and a reference to it in the Makefile
4961 Release code94f - 1994-05-05 13:00:33 -0000
4962 [tzcode94f.tar.gz is missing!]
4964 changes to avoid overflow in difftime, as well as changes to cope
4965 with the 52/53 challenge in strftime
4968 Release code94e - 1994-03-30 23:32:59 -0500
4970 change for the benefit of PCTS
4973 Release 94d - 1994-02-24 15:42:25 -0500
4975 Avoid clashes with POSIX semantics for zones such as GMT+4.
4977 Some other very minor housekeeping is also present.
4980 Release code94c - 1994-02-10 08:52:40 -0500
4982 Fix bug where mkdirs was broken unless you compile with
4983 -fwritable-strings (which is generally losing to do).
4986 Release 94b - 1994-02-07 10:04:33 -0500
4988 work by Paul Eggert who notes:
4990 I found another book of time zone histories by E W Whitman; it's not
4991 as extensive as Shanks but has a few goodies of its own. I used it
4992 to update the tables. I also fixed some more as a result of
4993 correspondence with Adam David and Peter Ilieve, and move some stray
4994 links from 'europe' to 'backward'. I corrected some scanning errors
4997 As far as the code goes, I fixed zic to allow years in the range
4998 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4999 And I cleaned up the zic documentation a little bit.
5002 Release data94a - 1994-02-03 08:58:54 -0500
5004 It simply incorporates the recently announced leap second into the
5008 Release 93g - 1993-11-22 17:28:27 -0500
5010 Paul Eggert has provided a good deal of historic information (based
5011 on Shanks), and there are some code changes to deal with the buglets
5012 that crawled out in dealing with the new information.
5015 Release 93f - 1993-10-15 12:27:46 -0400
5017 Paul Eggert's changes
5020 Release 93e - 1993-09-05 21:21:44 -0400
5022 This has updated data for Israel, England, and Kwajalein. There's
5023 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
5024 Thanks to Paul Eggert and Peter Ilieve for the changes.
5027 Release 93d - 1993-06-17 23:34:17 -0400
5029 new fix and new data on Israel
5032 Release 93c - 1993-06-06 19:31:55 -0400
5037 Release 93b - 1993-02-02 14:53:58 -0500
5039 updated "leapseconds" file
5042 Release 93 - 1993-01-08 07:01:06 -0500
5044 At kre's suggestion, the package has been split in two - a code piece
5045 (which also includes documentation) that's only of use to folks who
5046 want to recompile things and a data piece useful to anyone who can
5049 The new version has a few changes to the data files, a few
5050 portability changes, and an off-by-one fix (with thanks to
5051 Tom Karzes at deshaw.com for providing a description and a
5055 Release 92c - 1992-11-21 17:35:36 -0000
5056 [tz92c.tar.Z is missing!]
5058 The fallout from the latest round of DST transitions.
5060 There are changes for Portugal, Saskatchewan, and "Pacific-New";
5061 there's also a change to "zic.c" that makes it portable to more systems.
5064 Release 92 - 1992-04-25 18:17:03 -0000
5065 [tz92.tar.Z is missing!]
5067 By popular demand (well, at any rate, following a request by kre at munnari)
5070 The 1989 update of the time zone package featured:
5072 * POSIXization (including interpretation of POSIX-style TZ environment
5073 variables, provided by Guy Harris),
5074 * ANSIfication (including versions of "mktime" and "difftime"),
5075 * SVIDulation (an "altzone" variable)
5076 * MACHination (the "gtime" function)
5077 * corrections to some time zone data (including corrections to the rules
5078 for Great Britain and New Zealand)
5079 * reference data from the United States Naval Observatory for folks who
5080 want to do additional time zones
5081 * and the 1989 data for Saudi Arabia.
5083 (Since this code will be treated as "part of the implementation" in some
5084 places and as "part of the application" in others, there's no good way to
5085 name functions, such as timegm, that are not part of the proposed ANSI C
5086 standard; such functions have kept their old, underscore-free names in this
5089 And the "dysize" function has disappeared; it was present to allow
5090 compilation of the "date" command on old BSD systems, and a version of "date"
5091 is now provided in the package. The "date" command is not created when you
5092 "make all" since it may lack options provided by the version distributed with
5093 your operating system, or may not interact with the system in the same way
5094 the native version does.
5096 Since POSIX frowns on correct leap second handling, the default behavior of
5097 the "zic" command (in the absence of a "-L" option) has been changed to omit
5098 leap second information from its output files.
5104 This file contains copies of the part of each release announcement
5105 that talks about the changes in that release. The text has been
5106 adapted and reformatted for the purposes of this file.
5108 Traditionally a release R consists of a pair of tarball files,
5109 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
5110 code2010a, data2012c) consist of just one or the other tarball, and a
5111 few (e.g., code2012c-data2012d) have tarballs with mixed version
5112 numbers. Recent releases also come in an experimental format
5113 consisting of a single tarball tzdb-R.tar.lz with extra data.
5115 Release timestamps are taken from the release's commit (for newer,
5116 Git-based releases), from the newest file in the tarball (for older
5117 releases, where this info is available) or from the email announcing
5118 the release (if all else fails; these are marked with a time zone
5119 abbreviation of -0000 and an "is missing!" comment).
5121 Earlier versions of the code and data were not announced on the tz
5122 list and are not summarized here.
5124 This file is in the public domain.
projects / FreeBSD / FreeBSD.git / blob