1 News for the tz database
3 Release 2019c - 2019-09-11 08:59:48 -0700
6 Fiji observes DST from 2019-11-10 to 2020-01-12.
7 Norfolk Island starts observing Australian-style DST.
9 Changes to future timestamps
11 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12
12 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.)
13 Adjust future guesses accordingly.
15 Norfolk Island will observe Australian-style DST starting in
16 spring 2019. The first transition is on 2019-10-06. (Thanks to
17 Kyle Czech and Michael Deckers.)
19 Changes to past timestamps
21 Many corrections to time in Turkey from 1940 through 1985.
22 (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.)
24 The Norfolk Island 1975-03-02 transition was at 02:00 standard
25 time, not 02:00 DST. (Thanks to Michael Deckers.)
27 South Korea observed DST from 1948 through 1951. Although this
28 info was supposed to appear in release 2014j, a typo inadvertently
29 suppressed the change. (Thanks to Alois Treindl.)
31 Detroit observed DST in 1967 and 1968 following the US DST rules,
32 except that its 1967 DST began on June 14 at 00:01. (Thanks to
33 Alois Treindl for pointing out that the old data entries were
36 Fix several errors in pre-1970 transitions in Perry County, IN.
37 (Thanks to Alois Triendl for pointing out the 1967/9 errors.)
39 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver
40 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not
41 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02
42 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated
43 EET/EEST, not CET/CEST. (Thanks to Alois Triendl.) In 1946
44 Königsberg switched to +03 on 04-07 not 01-01.
46 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not
47 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.)
48 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27.
50 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon.
51 (Thanks to Michael Deckers.)
53 Changes to past time zone abbreviations and DST flags
55 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25,
56 is now flagged as DST and is abbreviated HKWT not HKT.
60 leapseconds.awk now relies only on its input data, rather than
61 also relying on its comments. (Inspired by code from Dennis
62 Ferguson and Chris Woodbury.)
64 The code now defends against CRLFs in leap-seconds.list.
65 (Thanks to Brian Inglis and Chris Woodbury.)
67 Changes to documentation and commentary
69 theory.html discusses leap seconds. (Thanks to Steve Summit.)
71 Nashville's newspapers dueled about the time of day in the 1950s.
72 (Thanks to John Seigenthaler.)
74 Liechtenstein observed Swiss DST in 1941/2.
75 (Thanks to Alois Treindl.)
78 Release 2019b - 2019-07-01 00:09:53 -0700
81 Brazil no longer observes DST.
82 'zic -b slim' outputs smaller TZif files; please try it out.
83 Palestine's 2019 spring-forward transition was on 03-29, not 03-30.
85 Changes to future timestamps
87 Brazil has canceled DST and will stay on standard time indefinitely.
88 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de
91 Predictions for Morocco now go through 2087 instead of 2037, to
92 work around a problem on newlib when using TZif files output by
93 zic 2019a or earlier. (Problem reported by David Gauchard.)
95 Changes to past and future timestamps
97 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30
98 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess
99 future transitions to be March's last Friday at 00:00.
101 Changes to past timestamps
103 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not
104 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00,
105 not 09-15 at 00:00. In 1946 its spring-forward transition was on
106 04-21 at 00:00, not the previous day at 03:30. From 1946 through
107 1952 its fall-back transitions occurred at 04:30, not at 03:30.
108 In 1947 its fall-back transition was on 11-30, not 12-30.
111 Changes to past time zone abbreviations
113 Italy's 1866 transition to Rome Mean Time was on December 12, not
114 September 22. This affects only the time zone abbreviation for
115 Europe/Rome between those dates. (Thanks to Stephen Trainor and
118 Changes affecting metadata only
120 Add info about the Crimea situation in zone1970.tab and zone.tab.
121 (Problem reported by Serhii Demediuk.)
125 zic's new -b option supports a way to control data bloat and to
126 test for year-2038 bugs in software that reads TZif files.
127 'zic -b fat' and 'zic -b slim' generate larger and smaller output;
128 for example, changing from fat to slim shrinks the Europe/London
129 file from 3648 to 1599 bytes, saving about 56%. Fat and slim
130 files represent the same set of timestamps and use the same TZif
131 format as documented in tzfile(5) and in Internet RFC 8536.
132 Fat format attempts to work around bugs or incompatibilities in
133 older software, notably software that mishandles 64-bit TZif data
134 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules.
135 Slim format is more efficient and does not work around 64-bit bugs
136 or obsolete TZ strings. Currently zic defaults to fat format
137 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this
138 out-of-the-box default is intended to change in future releases
139 as the buggy software often mishandles timestamps anyway.
141 zic no longer treats a set of rules ending in 2037 specially.
142 Previously, zic assumed that such a ruleset meant that future
143 timestamps could not be predicted, and therefore omitted a
144 POSIX-like TZ string in the TZif output. The old behavior is no
145 longer needed for current tzdata, and caused problems with newlib
146 when used with older tzdata (reported by David Gauchard).
148 zic no longer generates some artifact transitions. For example,
149 Europe/London no longer has a no-op transition in January 1996.
151 Changes to build procedure
153 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi
156 Changes to documentation and commentary
158 The Makefile now documents the POSIXRULES macro as being obsolete,
159 and similarly, zic's -p POSIXRULES option is now documented as
160 being obsolete. Although the POSIXRULES feature still exists and
161 works as before, in practice it is rarely used for its intended
162 purpose, and it does not work either in the default reference
163 implementation (for timestamps after 2037) or in common
164 implementations such as GNU/Linux (for contemporary timestamps).
165 Since POSIXRULES was designed primarily as a temporary transition
166 facility for System V platforms that died off decades ago, it is
167 being decommissioned rather than institutionalized.
169 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick).
172 Release 2019a - 2019-03-25 22:01:33 -0700
175 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23.
176 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00.
178 Changes to past and future timestamps
180 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
181 previously predicted. Adjust our prediction by guessing that spring
182 transitions will be between 24 and 30 March, which matches recent practice
183 since 2016. (Thanks to Even Scharning and Tim Parenti.)
185 Metlakatla ended its observance of Pacific standard time,
186 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan
187 Stanley and Tim Parenti.)
189 Changes to past timestamps
191 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25).
192 (Thanks to Alois Treindl and Isaac Starkman.)
194 Changes to time zone abbreviations
196 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead
197 of being a separate zone that generates the abbreviation "UCT",
198 which nowadays is typically a typo. (Problem reported by Isiah
203 zic now has an -r option to limit the time range of output data.
204 For example, 'zic -r @1000000000' limits the output data to
205 timestamps starting 1000000000 seconds after the Epoch.
206 This helps shrink output size and can be useful for applications
207 not needing the full timestamp history, such as TZDIST truncation;
208 see Internet RFC 8536 section 5.1. (Inspired by a feature request
209 from Christopher Wong, helped along by bug reports from Wong and
212 Changes to documentation
214 Mention Internet RFC 8536 (February 2019), which documents TZif.
216 tz-link.html now cites tzdata-meta
217 <https://tzdata-meta.timtimeonline.com/>.
220 Release 2018i - 2018-12-30 11:05:43 -0800
223 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
225 Changes to future timestamps
227 Due to a change in government, São Tomé and Príncipe switches back
228 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim
229 Nasardinov and Michael Deckers.)
232 Release 2018h - 2018-12-23 17:59:32 -0800
235 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
236 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
237 Metlakatla, Alaska observes PST this winter only.
238 Guess Morocco will continue to adjust clocks around Ramadan.
239 Add predictions for Iran from 2038 through 2090.
241 Changes to future timestamps
243 Guess that Morocco will continue to fall back just before and
244 spring forward just after Ramadan, the practice since 2012.
245 (Thanks to Maamar Abdelkader.) This means Morocco will observe
246 negative DST during Ramadan in main and vanguard formats, and in
247 rearguard format it stays in the +00 timezone and observes
248 ordinary DST in all months other than Ramadan. As before, extend
249 this guesswork to the year 2037. As a consequence, Morocco is
250 scheduled to observe three DST transitions in some Gregorian years
251 (e.g., 2033) due to the mismatch between the Gregorian and Islamic
254 The table of exact transitions for Iranian DST has been extended.
255 It formerly cut off before the year 2038 in a nod to 32-bit time_t.
256 It now cuts off before 2091 as there is doubt about how the Persian
257 calendar will treat 2091. This change predicts DST transitions in
258 2038-9, 2042-3, and 2046-7 to occur one day later than previously
259 predicted. As before, post-cutoff transitions are approximated.
261 Changes to past and future timestamps
263 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to
264 +05 on 2018-12-21. This is a zone split as Qostanay (aka
265 Kostanay) did not switch, so create a zone Asia/Qostanay.
267 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04.
268 It did not change clocks that day and remains on -08 this winter.
269 (Thanks to Ryan Stanley.) It will revert to the usual Alaska
270 rules next spring, so this change affects only timestamps
271 from 2018-11-04 through 2019-03-10.
273 Change to past timestamps
275 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00,
276 not 00:00. I transcribed the time incorrectly from Shanks.
277 (Thanks to Phake Nick.)
279 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00.
280 (Thanks to Phake Nick.)
282 Guam observed DST irregularly from 1959 through 1977.
283 (Thanks to Phake Nick.)
285 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on
286 10-01 changed standard time to +08:30 (not +08). Its transition
287 back to +08 after WWII was on 1945-09-15, not the previous day.
288 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT).
289 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also,
290 its 1952 fallback was on 11-02 (not 10-25).
292 This release contains many changes to timestamps before 1946 due
293 to Japanese possession or occupation of Pacific/Chuuk,
294 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro,
295 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei.
296 (Thanks to Phake Nick.)
298 Assume that the Spanish East Indies was like the Philippines and
299 observed American time until the end of 1844. This affects
300 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei.
302 Changes to past tm_isdst flags
304 For the recent Morocco change, the tm_isdst flag should be 1 from
305 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.)
306 Give a URL to the official decree. (Thanks to Matt Johnson.)
309 Release 2018g - 2018-10-26 22:22:45 -0700
312 Morocco switches to permanent +01 on 2018-10-28.
314 Changes to future timestamps
316 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28,
317 so its clocks will not fall back as previously scheduled.
318 (Thanks to Mohamed Essedik Najd and Brian Inglis.)
322 When generating TZif files with leap seconds, zic no longer uses a
323 format that trips up older 32-bit clients, fixing a bug introduced
324 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround
325 for QTBUG-53071 now also works for TZif files with leap seconds.
327 The translator to rearguard format now rewrites the line
328 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
329 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S".
330 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
331 and earlier. (Reported by Christos Zoulas.)
333 Changes to past time zone abbreviations
335 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
336 This reverts to 2011h, as the abbreviation change in 2011i was
339 Changes to documentation
341 tzfile.5 has new sections on interoperability issues.
344 Release 2018f - 2018-10-18 00:14:18 -0700
347 Volgograd moves from +03 to +04 on 2018-10-28.
348 Fiji ends DST 2019-01-13, not 2019-01-20.
349 Most of Chile changes DST dates, effective 2019-04-06.
351 Changes to future timestamps
353 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
354 (Thanks to Alexander Fetisov and Stepan Golosunov.)
356 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
357 predicted. (Thanks to Raymond Kumar.) Adjust future predictions
360 Most of Chile will end DST on the first Saturday in April at 24:00 mainland
361 time, and resume DST on the first Saturday in September at 24:00 mainland
362 time. The changes are effective from 2019-04-06, and do not affect the
363 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa
364 and Tim Parenti.) Adjust future predictions accordingly.
366 Changes to past timestamps
368 The 2018-05-05 North Korea 30-minute time zone change took place
369 at 23:30 the previous day, not at 00:00 that day.
371 China's 1988 spring-forward transition was on April 17, not
372 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00.
375 Fix several issues for Macau before 1992. Macau's pre-1904 LMT
376 was off by 10 s. Macau switched to +08 in 1904 not 1912, and
377 temporarily switched to +09/+10 during World War II. Macau
378 observed DST in 1942/79, not 1961/80, and there were several
379 errors for transition times and dates. (Thanks to P Chan.)
381 The 1948-1951 fallback transitions in Japan were at 25:00 on
382 September's second Saturday, not at 24:00. (Thanks to Phake Nick.)
383 zic turns this into 01:00 on the day after September's second
384 Saturday, which is the best that POSIX or C platforms can do.
386 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
387 paper by Li Yu, replacing more-questionable data from Shanks.
389 Changes to time zone abbreviations
391 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.)
395 zic now always generates TZif files where time type 0 is used for
396 timestamps before the first transition. This simplifies the
397 reading of TZif files and should not affect behavior of existing
398 TZif readers because the same set of time types is used; only
399 their internal indexes may have changed. This affects only the
400 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
401 EET, which previously used nonzero types for these timestamps.
403 Because of the type 0 change, zic no longer outputs a dummy
404 transition at time -2**59 (before the Big Bang), as clients should
405 no longer need this to handle historical timestamps correctly.
406 This reverts a change introduced in 2013d and shrinks most TZif
407 files by a few bytes.
409 zic now supports negative time-of-day in Rule and Leap lines, e.g.,
410 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
411 occurs at 18:00 on the Saturday before the last Sunday in April.
412 This behavior was documented in 2018a but the code did not
413 entirely match the documentation.
415 localtime.c no longer requires at least one time type in TZif
416 files that lack transitions or have a POSIX-style TZ string. This
417 future-proofs the code against possible future extensions to the
418 format that would allow TZif files with POSIX-style TZ strings and
419 without transitions or time types.
421 A read-access subscript error in localtime.c has been fixed.
422 It could occur only in TZif files with timecnt == 0, something that
423 does not happen in practice now but could happen in future versions.
425 localtime.c no longer ignores TZif POSIX-style TZ strings that
426 specify only standard time. Instead, these TZ strings now
427 override the default time type for timestamps after the last
428 transition (or for all timestamps if there are no transitions),
429 just as DST strings specifying DST have always done.
431 leapseconds.awk now outputs "#updated" and "#expires" comments,
432 and supports leap seconds at the ends of months other than June
433 and December. (Inspired by suggestions from Chris Woodbury.)
435 Changes to documentation
437 New restrictions: A Rule name must start with a character that
438 is neither an ASCII digit nor "-" nor "+", and an unquoted name
439 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
440 The latter restriction makes room for future extensions (a
441 possibility noted by Tom Lane).
443 tzfile.5 now documents what time types apply before the first and
444 after the last transition, if any.
446 Documentation now uses the spelling "timezone" for a TZ setting
447 that determines timestamp history, and "time zone" for a
448 geographic region currently sharing the same standard time.
450 The name "TZif" is now used for the tz binary data format.
452 tz-link.htm now mentions the A0 TimeZone Migration utilities.
453 (Thanks to Aldrin Martoq for the link.)
455 Changes to build procedure
457 New 'make' target 'rearguard_tarballs' to build the rearguard
458 tarball only. This is a convenience on platforms that lack lzip
459 if you want to build the rearguard tarball. (Problem reported by
462 tzdata.zi is now more stable from release to release. (Problem
463 noted by Tom Lane.) It is also a bit shorter.
465 tzdata.zi now can contain comment lines documenting configuration
466 information, such as which data format was selected, which input
467 files were used, and how leap seconds are treated. (Problems
468 noted by Lester Caine and Brian Inglis.) If the Makefile defaults
469 are used these comment lines are absent, for backward
470 compatibility. A redistributor intending to alter its copy of the
471 files should also append "-LABEL" to the 'version' file's first
472 line, where "LABEL" identifies the redistributor's change.
475 Release 2018e - 2018-05-01 23:42:51 -0700
479 North Korea switches back to +09 on 2018-05-05.
480 The main format uses negative DST again, for Ireland etc.
481 'make tarballs' now also builds a rearguard tarball.
482 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
484 Changes to past and future timestamps
486 North Korea switches back from +0830 to +09 on 2018-05-05.
487 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
490 Bring back the negative-DST changes of 2018a, except be more
491 compatible with data parsers that do not support negative DST.
492 Also, this now affects historical timestamps in Namibia and the
493 former Czechoslovakia, not just Ireland. The main format now uses
494 negative DST to model timestamps in Europe/Dublin (from 1971 on),
495 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
496 does not affect UT offsets, only time zone abbreviations and the
497 tm_isdst flag. Also, this does not affect rearguard or vanguard
498 formats; effectively the main format now uses vanguard instead of
499 rearguard format. Data parsers that do not support negative DST
500 can still use data from the rearguard tarball described below.
502 Changes to build procedure
504 The command 'make tarballs' now also builds the tarball
505 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
506 except that it uses rearguard format intended for trailing-edge
509 Changes to data format and to code
511 The SAVE column of Rule and Zone lines can now have an 's' or 'd'
512 suffix, which specifies whether the adjusted time is standard time
513 or daylight saving time. If no suffix is given, daylight saving
514 time is used if and only if the SAVE column is nonzero; this is
515 the longstanding behavior. Although this new feature is not used
516 in tzdata, it could be used to specify the legal time in Namibia
517 1994-2017, as opposed to the popular time (see below).
519 Changes to past timestamps
521 From 1994 through 2017 Namibia observed DST in winter, not summer.
522 That is, it used negative DST, as Ireland still does. This change
523 does not affect UTC offsets; it affects only the tm_isdst flag and
524 the abbreviation used during summer, which is now CAT, not WAST.
525 Although (as noted by Michael Deckers) summer and winter time were
526 both simply called "standard time" in Namibian law, in common
527 practice winter time was considered to be DST (as noted by Stephen
528 Colebourne). The full effect of this change is only in vanguard
529 and main format; in rearguard format, the tm_isdst flag is still
530 zero in winter and nonzero in summer.
532 In 1946/7 Czechoslovakia also observed negative DST in winter.
533 The full effect of this change is only in vanguard and main
534 formats; in rearguard format, it is modeled as plain GMT without
535 daylight saving. Also, the dates of some 1944/5 DST transitions
536 in Czechoslovakia have been changed.
539 Release 2018d - 2018-03-22 07:05:46 -0700
543 Palestine starts DST a week earlier in 2018.
544 Add support for vanguard and rearguard data consumers.
545 Add subsecond precision to source data format, though not to data.
547 Changes to future timestamps
549 In 2018, Palestine starts DST on March 24, not March 31.
550 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
552 Changes to past and future timestamps
554 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
555 at 04:00. (Thanks to Steffen Thorsen.)
557 Changes to past timestamps
559 Historical transitions for Uruguay, represented by
560 America/Montevideo, have been updated per official legal documents,
561 replacing previous data mainly originating from the inventions of
562 Shanks & Pottenger. This has resulted in adjustments ranging from
563 30 to 90 minutes in either direction over at least two dozen
564 distinct periods ranging from one day to several years in length.
565 A mere handful of pre-1991 transitions are unaffected; data since
566 then has come from more reliable contemporaneous reporting. These
567 changes affect various timestamps in 1920-1923, 1936, 1939,
568 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
569 Additionally, Uruguay's pre-standard-time UT offset has been
570 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
571 match the location of the Observatory of the National Meteorological
572 Institute in Montevideo.
573 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
575 Enderbury and Kiritimati skipped New Year's Eve 1994, not
576 New Year's Day 1995. (Thanks to Kerry Shetline.)
578 Fix the 1912-01-01 transition for Portugal and its colonies.
579 This transition was at 00:00 according to the new UT offset, not
580 according to the old one. Also assume that Cape Verde switched on
581 the same date as the rest, not in 1907. This affects
582 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
583 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
584 (Thanks to Michael Deckers.)
586 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
589 Changes to past time zone abbreviations
591 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There
592 is no clock change associated with the transition.
594 Changes to build procedure
596 The new DATAFORM macro in the Makefile lets the installer choose
597 among three source data formats. The idea is to lessen downstream
598 disruption when data formats are improved.
600 * DATAFORM=vanguard installs from the latest, bleeding-edge
601 format. DATAFORM=main (the default) installs from the format
602 used in the 'africa' etc. files. DATAFORM=rearguard installs
603 from a trailing-edge format. Eventually, elements of today's
604 vanguard format should move to the main format, and similarly
605 the main format's features should eventually move to the
608 * In the current version, the main and rearguard formats are
609 identical and match that of 2018c, so this change does not
610 affect default behavior. The vanguard format currently contains
611 one feature not in the main format: negative SAVE values. This
612 improves support for Ireland, which uses Irish Standard Time
613 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has
614 supported negative SAVE values for decades, and this feature
615 should move to the main format soon. However, it will not move
616 to the rearguard format for quite some time because some
617 downstream parsers do not support it.
619 * The build procedure constructs three files vanguard.zi, main.zi,
620 and rearguard.zi, one for each format. Although the files
621 represent essentially the same data, they may have minor
622 discrepancies that users are not likely to notice. The files
623 are intended for downstream data consumers and are not
624 installed. Zoneinfo parsers that do not support negative SAVE values
625 should start using rearguard.zi, so that they will be unaffected
626 when the negative-DST feature moves from vanguard to main.
627 Bleeding-edge Zoneinfo parsers that support the new features
628 already can use vanguard.zi; in this respect, current tzcode is
631 The Makefile should now be safe for parallelized builds, and 'make
632 -j to2050new.tzs' is now much faster on a multiprocessor host
635 When built with -DSUPPRESS_TZDIR, the tzcode library no longer
636 prepends TZDIR/ to file names that do not begin with '/'. This is
637 not recommended for general use, due to its security implications.
638 (From a suggestion by Manuela Friedrich.)
642 zic now accepts subsecond precision in expressions like
643 00:19:32.13, which is approximately the legal time of the
644 Netherlands from 1835 to 1937. However, because it is
645 questionable whether the few recorded uses of non-integer offsets
646 had subsecond precision in practice, there are no plans for tzdata
647 to use this feature. (Thanks to Steve Allen for pointing out
648 the limitations of historical data in this area.)
650 The code is a bit more portable to MS-Windows. Installers can
651 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
652 reserve identifiers like 'localtime'. (Thanks to Manuela
655 Changes to documentation and commentary
657 theory.html now outlines tzdb's extensions to POSIX's model for
658 civil time, and has a section "POSIX features no longer needed"
659 that lists POSIX API components that are now vestigial.
660 (From suggestions by Steve Summit.) It also better distinguishes
661 time zones from tz regions. (From a suggestion by Guy Harris.)
663 Commentary is now more consistent about using the phrase "daylight
664 saving time", to match the C name tm_isdst. Daylight saving time
665 need not occur in summer, and need not have a positive offset from
668 Commentary about historical transitions in Uruguay has been expanded
669 with links to many relevant legal documents.
670 (Thanks to Tim Parenti.)
672 Commentary now uses some non-ASCII characters with Unicode value
673 less than U+0100, as they can be useful and should work even with
674 older editors such as XEmacs.
677 Release 2018c - 2018-01-22 23:00:44 -0800
680 Revert Irish changes that relied on negative SAVE values.
684 Revert the 2018a change to Europe/Dublin. As before, this change
685 does not affect UT offsets or abbreviations; it affects only
686 whether timestamps are considered to be standard time or
687 daylight-saving time, as expressed in the tm_isdst flag of C's
688 struct tm type. This reversion is intended to be a temporary
689 workaround for problems discovered with downstream uses of
690 releases 2018a and 2018b, which implemented Irish time by using
691 negative SAVE values in the Eire rules of the 'europe' file.
692 Although negative SAVE values have been part of tzcode for many
693 years and are supported by many platforms, they were not
694 documented before 2018a and ICU and OpenJDK do not currently
695 support them. A mechanism to export data to platforms lacking
696 support for negative DST is planned to be developed before the
697 change is reapplied. (Problems reported by Deborah Goldsmith and
700 Changes to past timestamps
702 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
703 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
705 Changes to build procedure
707 The build procedure now works around mawk 1.3.3's lack of support
708 for character class expressions. (Problem reported by Ohyama.)
711 Release 2018b - 2018-01-17 23:24:48 -0800
714 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
716 Changes to build procedure
718 The distribution now contains the file 'pacificnew' again.
719 This file was inadvertantly omitted in the 2018a distribution.
720 (Problem reported by Matias Fonzo.)
723 Release 2018a - 2018-01-12 22:29:21 -0800
726 São Tomé and Príncipe switched from +00 to +01.
727 Brazil's DST will now start on November's first Sunday.
728 Ireland's standard time is now in the summer, not the winter.
729 Use Debian-style installation locations, instead of 4.3BSD-style.
732 Changes to past and future timestamps
734 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
735 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
737 Changes to future timestamps
739 Starting in 2018 southern Brazil will begin DST on November's
740 first Sunday instead of October's third Sunday. (Thanks to
743 Changes to past timestamps
745 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
746 been corrected. The 'backzone' and 'zone.tab' files did not agree
747 with the 'africa' and 'zone1970.tab' files. (Problem reported by
750 The abbreviation invented for Bolivia Summer Time (1931-2) is now
751 BST instead of BOST, to be more consistent with the convention
752 used for Latvian Summer Time (1918-9) and for British Summer Time.
756 Change Europe/Dublin so that it observes Irish Standard Time (UT
757 +01) in summer and GMT (as negative daylight-saving) in winter,
758 instead of observing standard time (GMT) in winter and Irish
759 Summer Time (UT +01) in summer. This change does not affect UT
760 offsets or abbreviations; it affects only whether timestamps are
761 considered to be standard time or daylight-saving time, as
762 expressed in the tm_isdst flag of C's struct tm type.
763 (Discrepancy noted by Derick Rethans.)
765 Changes to build procedure
767 The default installation locations have been changed to mostly
768 match Debian circa 2017, instead of being designed as an add-on to
769 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
770 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
771 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
772 locations more precisely. (This responds to suggestions from
773 Brian Inglis and from Steve Summit.)
775 The default installation procedure no longer creates the
776 backward-compatibility link US/Pacific-New, which causes
777 confusion during user setup (e.g., see Debian bug 815200).
778 Use 'make BACKWARD="backward pacificnew"' to create the link
779 anyway, for now. Eventually we plan to remove the link entirely.
781 tzdata.zi now contains a version-number comment.
782 (Suggested by Tom Lane.)
784 The Makefile now quotes values like BACKWARD more carefully when
785 passing them to the shell. (Problem reported by Zefram.)
787 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
788 that have snprintf and use pre-C99 compilers. (Problem reported
793 zic has a new option -t FILE that specifies the location of the
794 file that determines local time when TZ is unset. The default for
795 this location can be configured via the new TZDEFAULT makefile
796 macro, which defaults to /etc/localtime.
798 Diagnostics and commentary now distinguish UT from UTC more
799 carefully; see theory.html for more information about UT vs UTC.
801 zic has been ported to GCC 8's -Wstringop-truncation option.
802 (Problem reported by Martin Sebor.)
804 Changes to documentation and commentary
806 The zic man page now documents the longstanding behavior that
807 times and years can be out of the usual range, with negative times
808 counting backwards from midnight and with year 0 preceding year 1.
809 (Problem reported by Michael Deckers.)
811 The theory.html file now mentions the POSIX limit of six chars
812 per abbreviation, and lists alphabetic abbreviations used.
814 The files tz-art.htm and tz-link.htm have been renamed to
815 tz-art.html and tz-link.html, respectively, for consistency with
816 other file names and to simplify web server configuration.
819 Release 2017c - 2017-10-20 14:49:34 -0700
822 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
823 Fiji ends DST 2018-01-14, not 2018-01-21.
824 Namibia switches from +01/+02 to +02 on 2018-04-01.
825 Sudan switches from +03 to +02 on 2017-11-01.
826 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
827 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
828 A new file tzdata.zi now holds a small text copy of all data.
829 The zic input format has been regularized slightly.
831 Changes to future timestamps
833 Northern Cyprus has decided to resume EU rules starting
834 2017-10-29, thus reinstituting winter time.
836 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
837 predicted. (Thanks to Dominic Fok.) Adjust future predictions
840 Namibia will switch from +01 with DST to +02 all year on
841 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
842 at 02:00. (Thanks to Steffen Thorsen.)
844 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
845 Atyya and Yahia Abdalla.) South Sudan is not switching, so
846 Africa/Juba is no longer a link to Africa/Khartoum.
848 Tonga has likely ended its experiment with DST, and will not
849 adjust its clocks on 2017-11-05. Although Tonga has not announced
850 whether it will continue to observe DST, the IATA is assuming that
851 it will not. (Thanks to David Wade.)
853 Turks & Caicos will switch from -04 all year to -05 with US DST on
854 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
855 at 02:00. (Thanks to Steffen Thorsen.)
857 Changes to past timestamps
859 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
860 (Thanks to Arthur David Olson.)
862 Detroit did not observe DST in 1967.
864 Use railway time for Asia/Kolkata before 1941, by switching to
865 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
866 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
868 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
869 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
871 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
872 American time in 1892, not 1879. (Thanks to Michael Deckers.)
874 Adjust the 1867 transition in Alaska to better reflect the
875 historical record, by changing it to occur on 1867-10-18 at 15:30
876 Sitka time rather than at the start of 1867-10-17 local time.
877 Although strictly speaking this is accurate only for Sitka,
878 the rest of Alaska's blanks need to be filled in somehow.
880 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
881 (Thanks to Michael Deckers.)
883 Add 7 s to the UT offset in Asia/Yangon before 1920.
885 Changes to zone names
887 Remove Canada/East-Saskatchewan from the 'backward' file, as it
888 exceeded the 14-character limit and was an unused misnomer anyway.
890 Changes to build procedure
892 To support applications that prefer to read time zone data in text
893 form, two zic input files tzdata.zi and leapseconds are now
894 installed by default. The commands 'zic tzdata.zi' and 'zic -L
895 leapseconds tzdata.zi' can reproduce the tzdata binary files
896 without and with leap seconds, respectively. To prevent these two
897 new files from being installed, use 'make TZDATA_TEXT=', and to
898 suppress leap seconds from the tzdata text installation, use 'make
899 TZDATA_TEXT=tzdata.zi'.
901 'make BACKWARD=' now suppresses backward-compatibility names
902 like 'US/Pacific' that are defined in the 'backward' and
905 'make check' now works on systems that lack a UTF-8 locale,
906 or that lack the nsgmls program. Set UTF8_LOCALE to configure
907 the name of a UTF-8 locale, if you have one.
909 Y2K runtime checks are no longer enabled by default. Add
910 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
911 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
912 to disable them. (New name suggested by Brian Inglis.)
914 The build procedure for zdump now works on AIX 7.1.
915 (Problem reported by Kees Dekker.)
919 zic and the reference runtime now reject multiple leap seconds
920 within 28 days of each other, or leap seconds before the Epoch.
921 As a result, support for double leap seconds, which was
922 obsolescent and undocumented, has been removed. Double leap
923 seconds were an error in the C89 standard; they have never existed
924 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
925 noticing glitches in the code that uncovered this problem.)
927 zic now warns about use of the obsolescent and undocumented -y
928 option, and about use of the obsolescent TYPE field of Rule lines.
930 zic now allows unambiguous abbreviations like "Sa" and "Su" for
931 weekdays; formerly it rejected them due to a bug. Conversely, zic
932 no longer considers non-prefixes to be abbreviations; for example,
933 it no longer accepts "lF" as an abbreviation for "lastFriday".
934 Also, zic warns about the undocumented usage with a "last-"
935 prefix, e.g., "last-Fri".
937 Similarly, zic now accepts the unambiguous abbreviation "L" for
938 "Link" in ordinary context and for "Leap" in leap-second context.
939 Conversely, zic no longer accepts non-prefixes such as "La" as
940 abbreviations for words like "Leap".
942 zic no longer accepts leap second lines in ordinary input, or
943 ordinary lines in leap second input. Formerly, zic sometimes
944 warned about this undocumented usage and handled it incorrectly.
946 The new macro HAVE_TZNAME governs whether the tzname external
947 variable is exported, instead of USG_COMPAT. USG_COMPAT now
948 governs only the external variables "timezone" and "daylight".
949 This change is needed because the three variables are not in the
950 same category: although POSIX requires tzname, it specifies the
951 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
952 if not defined, the code attempts to guess it from other macros.
954 localtime.c and difftime.c no longer require stdio.h, and .c files
955 other than zic.c no longer require sys/wait.h.
957 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
959 Calculation of time_t extrema works around a bug in GCC 4.8.4
960 (Reported by Stan Shebs and Joseph Myers.)
962 zic.c no longer mistranslates formats of line numbers in non-English
963 locales. (Problem reported by Benno Schulenberg.)
965 Several minor changes have been made to the code to make it a
966 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
967 Dekker for reporting the problems.)
969 Changes to documentation and commentary
971 The two new files 'theory.html' and 'calendars' contain the
972 contents of the removed file 'Theory'. The goal is to document
973 tzdb theory more accessibly.
975 The zic man page now documents abbreviation rules.
977 tz-link.htm now covers how to apply tzdata changes to clients.
978 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
980 The leap-seconds.list URL has been updated to something that is
981 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
983 Release 2017b - 2017-03-17 07:30:38 -0700
985 Briefly: Haiti has resumed DST.
987 Changes to past and future timestamps
989 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
991 Changes to past timestamps
993 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
995 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
996 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
1000 The reference localtime implementation now falls back on the
1001 current US daylight-saving transition rules rather than the
1002 1987-2006 rules. This fallback occurs only when (1) the TZ
1003 environment variable has a value like "AST4ADT" that asks
1004 for daylight saving time but does not specify the rules, (2) there
1005 is no file by that name, and (3) the TZDEFRULES file cannot be
1006 loaded. (Thanks to Tom Lane.)
1009 Release 2017a - 2017-02-28 00:05:36 -0800
1011 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
1014 Changes to future timestamps
1016 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
1018 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
1019 Its clocks diverge from America/Santiago starting 2017-05-13 at
1020 23:00, hiving off a new zone America/Punta_Arenas. Although the
1021 Chilean government says this change expires in May 2019, for now
1022 assume it's permanent. (Thanks to Juan Correa and Deborah
1023 Goldsmith.) This also affects Antarctica/Palmer.
1025 Changes to past timestamps
1027 Fix many entries for historical timestamps for Europe/Madrid
1028 before 1979, to agree with tables compiled by Pere Planesas of the
1029 National Astronomical Observatory of Spain. As a side effect,
1030 this changes some timestamps for Africa/Ceuta before 1929, which
1031 are probably guesswork anyway. (Thanks to Steve Allen and
1032 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
1033 correcting the 1901 transition.)
1035 Ecuador observed DST from 1992-11-28 to 1993-02-05.
1036 (Thanks to Alois Treindl.)
1038 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
1039 (Thanks to Stepan Golosunov.)
1041 Changes to past and future time zone abbreviations
1043 Switch to numeric time zone abbreviations for South America, as
1044 part of the ongoing project of removing invented abbreviations.
1045 This avoids the need to invent an abbreviation for the new Chilean
1046 new zone. Similarly, switch from invented to numeric time zone
1047 abbreviations for Afghanistan, American Samoa, the Azores,
1048 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
1049 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
1050 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
1051 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
1052 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
1053 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
1054 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
1055 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
1056 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
1057 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
1058 for half-hour daylight saving time in Belize before 1944 and in
1059 the Dominican Republic before 1975; and for Canary Islands before
1060 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
1061 Indian Summer Time before 1942, for Indonesia before around 1964,
1062 for Kenya before 1960, for Liberia before 1973, for Madeira before
1063 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
1064 Pakistan before 1971, for Western Sahara before 1977, and for
1065 Zaporozhye in 1880-1924.
1067 For Alaska time from 1900 through 1967, instead of "CAT" use the
1068 abbreviation "AST", the abbreviation commonly used at the time
1069 (Atlantic Standard Time had not been standardized yet). Use "AWT"
1070 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
1072 Use "CST" and "CDT" instead of invented abbreviations for Macau
1073 before 1999 and Taiwan before 1938, and use "JST" instead of the
1074 invented abbreviation "JCST" for Japan and Korea before 1938.
1076 Change to database entry category
1078 Move the Pacific/Johnston link from 'australasia' to 'backward',
1079 since Johnston is now uninhabited.
1083 zic no longer mishandles some transitions in January 2038 when it
1084 attempts to work around Qt bug 53071. This fixes a bug affecting
1085 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
1086 now contains a workaround, useful when loading a file generated by
1087 a buggy zic. (Problem and localtime.c fix reported by Bradley
1090 zdump -i now outputs non-hour numeric time zone abbreviations
1091 without a colon, e.g., "+0530" rather than "+05:30". This agrees
1092 with zic %z and with common practice, and simplifies auditing of
1095 zdump is now buildable again with -DUSE_LTZ=0.
1096 (Problem reported by Joseph Myers.)
1098 zdump.c now always includes private.h, to avoid code duplication
1099 with private.h. (Problem reported by Kees Dekker.)
1101 localtime.c no longer mishandles early or late timestamps
1102 when TZ is set to a POSIX-style string that specifies DST.
1103 (Problem reported by Kees Dekker.)
1105 date and strftime now cause %z to generate "-0000" instead of
1106 "+0000" when the UT offset is zero and the time zone abbreviation
1109 Changes to documentation and commentary
1111 The 'Theory' file now better documents choice of historical time
1112 zone abbreviations. (Problems reported by Michael Deckers.)
1114 tz-link.htm now covers leap smearing, which is popular in clouds.
1117 Release 2016j - 2016-11-22 23:17:13 -0800
1119 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
1121 Changes to future timestamps
1123 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
1124 This hives off a new zone Europe/Saratov from Europe/Volgograd.
1125 (Thanks to Yuri Konotopov and Stepan Golosunov.)
1127 Changes to past timestamps
1129 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
1130 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
1131 1999, not fall 1994. (Thanks to Stepan Golosunov.)
1133 Changes to past time zone abbreviations
1135 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
1136 summer time before 1948. The old use of "EET" was a typo.
1140 zic no longer mishandles file systems that lack hard links, fixing
1141 bugs introduced in 2016g. (Problems reported by Tom Lane.)
1142 Also, when the destination already contains symbolic links, zic
1143 should now work better on systems where the 'link' system call
1144 does not follow symbolic links.
1146 Changes to documentation and commentary
1148 tz-link.htm now documents the relationship between release version
1149 numbers and development-repository commit tags. (Suggested by
1152 The 'Theory' file now documents UT.
1154 iso3166.tab now accents "Curaçao", and commentary now mentions
1155 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
1158 Release 2016i - 2016-11-01 23:19:52 -0700
1160 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
1161 reintroduces DST on 2016-11-06.
1163 Changes to future timestamps
1165 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
1166 2017-01-15 at 03:00. Assume future observances in Tonga will be
1167 from the first Sunday in November through the third Sunday in
1168 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
1169 time zone abbreviations for this zone.
1171 Changes to past and future timestamps
1173 Northern Cyprus is now +03 year round, causing a split in Cyprus
1174 time zones starting 2016-10-30 at 04:00. This creates a zone
1175 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
1177 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
1178 (Thanks to Steffen Thorsen.)
1180 Changes to past timestamps
1182 Several corrections were made for pre-1975 timestamps in Italy.
1183 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
1186 First, the 1893-11-01 00:00 transition in Italy used the new UT
1187 offset (+01), not the old (+00:49:56). (Thanks to Michael
1190 Second, rules for daylight saving in Italy were changed to agree
1191 with Italy's National Institute of Metrological Research (INRiM)
1192 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
1193 Inglis, and Michael Deckers):
1195 The 1916-06-03 transition was at 24:00, not 00:00.
1197 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
1200 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
1203 The 1944-09-17 transition was at 03:00, not 01:00. This
1204 particular change is taken from Italian law as INRiM's table,
1205 (which says 02:00) appears to have a typo here. Also, keep the
1206 1944-04-03 transition for Europe/Rome, as Rome was controlled by
1209 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
1214 The code should now be buildable on AmigaOS merely by setting the
1215 appropriate Makefile variables. (From a patch by Carsten Larsen.)
1218 Release 2016h - 2016-10-19 23:17:57 -0700
1220 Changes to future timestamps
1222 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
1223 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
1224 future fall transitions will be on the last Saturday of October
1225 at 01:00, which is consistent with predicted spring transitions
1226 on the last Saturday of March. (Thanks to Tim Parenti.)
1228 Changes to past timestamps
1230 In Turkey, transitions in 1986-1990 were at 01:00 standard time
1231 not at 02:00, and the spring 1994 transition was on March 20, not
1232 March 27. (Thanks to Kıvanç Yazan.)
1234 Changes to past and future time zone abbreviations
1236 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
1237 instead of alphabetic ones like "IST" and "LKT". Various
1238 English-language sources use "IST", "LKT" and "SLST", with no
1239 working consensus. (Usage of "SLST" mentioned by Sadika
1244 zic no longer mishandles relativizing file names when creating
1245 symbolic links like /etc/localtime, when these symbolic links
1246 are outside the usual directory hierarchy. This fixes a bug
1247 introduced in 2016g. (Problem reported by Andreas Stieger.)
1249 Changes to build procedure
1251 New rules 'traditional_tarballs' and 'traditional_signatures' for
1252 building just the traditional-format distribution. (Requested by
1255 The file 'version' is now put into the tzdata tarball too.
1256 (Requested by Howard Hinnant.)
1258 Changes to documentation and commentary
1260 The 'Theory' file now has a section on interface stability.
1261 (Requested by Paul Koning.) It also mentions features like
1262 tm_zone and localtime_rz that have long been supported by the
1265 tz-link.htm has improved coverage of time zone boundaries suitable
1266 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
1269 The US commentary now mentions Allen and the "day of two noons".
1271 The Fiji commentary mentions the government's 2016-10-03 press
1272 release. (Thanks to Raymond Kumar.)
1275 Release 2016g - 2016-09-13 08:56:38 -0700
1277 Changes to future timestamps
1279 Turkey switched from EET/EEST (+02/+03) to permanent +03,
1280 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
1281 than an invented abbreviation for the new time.
1283 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
1284 (Thanks to Tim Parenti.)
1286 Changes to past timestamps
1288 For America/Los_Angeles, spring-forward transition times have been
1289 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
1292 For zones using Soviet time on 1919-07-01, transitions to UT-based
1293 time were at 00:00 UT, not at 02:00 local time. The affected
1294 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
1295 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
1297 Changes to past and future time zone abbreviations
1299 The Factory zone now uses the time zone abbreviation -00 instead
1300 of a long English-language string, as -00 is now the normal way to
1301 represent an undefined time zone.
1303 Several zones in Antarctica and the former Soviet Union, along
1304 with zones intended for ships at sea that cannot use POSIX TZ
1305 strings, now use numeric time zone abbreviations instead of
1306 invented or obsolete alphanumeric abbreviations. The affected
1307 zones are Antarctica/Casey, Antarctica/Davis,
1308 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
1309 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
1310 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
1311 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
1312 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
1313 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
1314 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
1315 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
1316 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
1317 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
1318 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
1319 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
1320 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
1321 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
1322 was replaced by +05, whereas MSK and MSD were kept as they are not
1323 our invention and are widely used.
1325 Changes to zone names
1327 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
1328 (Thanks to David Massoud.)
1332 zic no longer generates binary files containing POSIX TZ-like
1333 strings that disagree with the local time type after the last
1334 explicit transition in the data. This fixes a bug with
1335 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
1336 on the reference platform. (Thanks to Alexander Belopolsky for
1337 reporting the bug and suggesting a way forward.)
1339 If the installed localtime and/or posixrules files are symbolic
1340 links, zic now keeps them symbolic links when updating them, for
1341 compatibility with platforms like OpenSUSE where other programs
1342 configure these files as symlinks.
1344 zic now avoids hard linking to symbolic links, avoids some
1345 unnecessary mkdir and stat system calls, and uses shorter file
1348 zdump has a new -i option to generate transitions in a
1349 more-compact but still human-readable format. This option is
1350 experimental, and the output format may change in future versions.
1351 (Thanks to Jon Skeet for suggesting that an option was needed,
1352 and thanks to Tim Parenti and Chris Rovick for further comments.)
1354 Changes to build procedure
1356 An experimental distribution format is available, in addition
1357 to the traditional format which will continue to be distributed.
1358 The new format is a tarball tzdb-VERSION.tar.lz with signature
1359 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
1360 tzdb-VERSION containing the code and data of the traditional
1361 two-tarball format, along with extra data that may be useful.
1362 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
1363 for comments about the experimental format.)
1365 The release version number is now more accurate in the usual case
1366 where releases are built from a Git repository. For example, if
1367 23 commits and some working-file changes have been made since
1368 release 2016g, the version number is now something like
1369 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
1370 Tagged releases use the same version number format as before,
1371 e.g., '2016g'. To support the more-accurate version number, its
1372 specification has moved from a line in the Makefile to a new
1373 source file 'version'.
1375 The experimental distribution contains a file to2050.tzs that
1376 contains what should be the output of 'zdump -i -c 2050' on
1377 primary zones. If this file is available, 'make check' now checks
1378 that zdump generates this output.
1380 'make check_web' now works on Fedora-like distributions.
1382 Changes to documentation and commentary
1384 tzfile.5 now documents the new restriction on POSIX TZ-like
1385 strings that is now implemented by zic.
1387 Comments now cite URLs for some 1917-1921 Russian DST decrees.
1388 (Thanks to Alexander Belopolsky.)
1390 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
1391 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
1392 description of Java 8 has been brought up to date (thanks to
1393 Stephen Colebourne). Its description of local time on Mars has
1394 been updated to match current practice, and URLs have been updated
1395 and some obsolete ones removed.
1398 Release 2016f - 2016-07-05 16:26:51 +0200
1400 Changes affecting future timestamps
1402 The Egyptian government changed its mind on short notice, and
1403 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
1404 (Thanks to Mina Samuel.)
1406 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
1407 (Thanks to Stepan Golosunov.)
1409 Changes to past and future timestamps
1411 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
1412 abbreviations instead of invented ones.
1414 Changes affecting past timestamps
1416 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
1417 (Thanks to Stepan Golosunov.)
1420 Release 2016e - 2016-06-14 08:46:16 -0700
1422 Changes affecting future timestamps
1424 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
1425 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
1426 For future years, guess April's last Thursday to October's last
1427 Thursday except for Ramadan.
1429 Changes affecting past timestamps
1431 Locations while uninhabited now use '-00', not 'zzz', as a
1432 placeholder time zone abbreviation. This is inspired by Internet
1433 RFC 3339 and is more consistent with numeric time zone
1434 abbreviations already used elsewhere. The change affects several
1435 arctic and antarctic locations, e.g., America/Cambridge_Bay before
1436 1920 and Antarctica/Troll before 2005.
1438 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
1439 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
1443 zic now outputs a dummy transition at time 2**31 - 1 in zones
1444 whose POSIX-style TZ strings contain a '<'. This mostly works
1445 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
1446 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
1448 Changes affecting documentation and commentary
1450 tz-link.htm says why governments should give plenty of notice for
1451 time zone or DST changes, and refers to Matt Johnson's blog post.
1453 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
1456 Release 2016d - 2016-04-17 22:50:29 -0700
1458 Changes affecting future timestamps
1460 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
1461 (Thanks to Alexander Krivenyshev for the heads-up.)
1463 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
1464 (Thanks to Alexander Krivenyshev and Matt Johnson.)
1466 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
1467 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
1468 at 02:00. (Thanks to Stepan Golosunov.)
1470 Changes affecting past timestamps
1472 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
1473 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1474 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1475 the same change. (Thanks to Stepan Golosunov.)
1477 Russia and nearby locations had daylight-saving transitions on
1478 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1479 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
1482 Many corrections to historical time in Kazakhstan from 1991
1483 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
1484 invented time zone abbreviations with numeric abbreviations.
1486 Changes to commentary
1488 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1491 Release 2016c - 2016-03-23 00:51:27 -0700
1493 Changes affecting future timestamps
1495 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
1497 Chile reverts from permanent to seasonal DST. (Thanks to Juan
1498 Correa for the heads-up, and to Tim Parenti for corrections.)
1499 Guess that future transitions are August's and May's second
1500 Saturdays at 24:00 mainland time. Also, call the period from
1501 2014-09-07 through 2016-05-14 daylight saving time instead of
1502 standard time, as that seems more appropriate now.
1504 Changes affecting past timestamps
1506 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1507 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1508 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1509 (Thanks to Stepan Golosunov.)
1511 Changes to commentary
1513 Several updates and URLs for historical and proposed Russian changes.
1514 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1517 Release 2016b - 2016-03-12 17:30:14 -0800
1521 Starting with release 2016b, some data entries cause zic implementations
1522 derived from tz releases 2005j through 2015e to issue warnings like
1523 "time zone abbreviation differs from POSIX standard (+03)".
1524 These warnings should not otherwise affect zic's output and can safely be
1525 ignored on today's platforms, as the warnings refer to a restriction in
1526 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
1527 warnings is to upgrade to zic derived from tz releases 2015f and later.
1529 Changes affecting future timestamps
1531 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1532 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1533 2016-03-27 at 02:00 local time. They need distinct zones since their
1534 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
1535 Altai Republic, Russia, which will switch from +06 to +07 on the same date
1536 and local time. The Astrakhan change is already official; the others have
1537 passed the first reading in the State Duma and are extremely likely.
1538 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1539 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1540 and Stepan Golosunov for followup.)
1542 As a trial of a new system that needs less information to be made up,
1543 the new zones use numeric time zone abbreviations like "+04"
1544 instead of invented abbreviations like "ASTT".
1546 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
1549 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1550 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1551 Saturday at 01:00, not March's last Friday at 24:00.
1553 Changes affecting past timestamps
1555 Europe/Chisinau observed DST during 1990, and switched from +04 to
1556 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1557 (Thanks to Stepan Golosunov.)
1559 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1560 KUYT/KUYST. (Thanks to Stepan Golosunov.)
1564 tzselect's diagnostics and checking, and checktab.awk's checking,
1565 have been improved. (Thanks to J William Piggott.)
1567 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
1569 tzselect now tests Julian-date TZ settings more accurately.
1570 (Thanks to J William Piggott.)
1572 Changes to commentary
1574 Comments in zone tables have been improved. (Thanks to J William Piggott.)
1576 tzselect again limits its menu comments so that menus fit on a
1577 24×80 alphanumeric display.
1579 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
1581 In the Theory file, the description of possible time zone abbreviations in
1582 tzdata has been cleaned up, as the old description was unclear and
1583 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
1586 Release 2016a - 2016-01-26 23:28:02 -0800
1588 Changes affecting future timestamps
1590 America/Cayman will not observe daylight saving this year after all.
1591 Revert our guess that it would. (Thanks to Matt Johnson.)
1593 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1594 (Thanks to Alexander Krivenyshev.)
1596 Asia/Tehran now has DST predictions for the year 2038 and later,
1597 to be March 21 00:00 to September 21 00:00. This is likely better
1598 than predicting no DST, albeit off by a day every now and then.
1600 Changes affecting past and future timestamps
1602 America/Metlakatla switched from PST all year to AKST/AKDT on
1603 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1605 America/Santa_Isabel has been removed, and replaced with a
1606 backward compatibility link to America/Tijuana. Its contents were
1607 apparently based on a misreading of Mexican legislation.
1609 Changes affecting past timestamps
1611 Asia/Karachi's two transition times in 2002 were off by a minute.
1612 (Thanks to Matt Johnson.)
1614 Changes affecting build procedure
1616 An installer can now combine leap seconds with use of the backzone file,
1617 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1618 The old 'make posix_packrat' rule is now marked as obsolescent.
1619 (Thanks to Ian Abbott for an initial implementation.)
1621 Changes affecting documentation and commentary
1623 A new file LICENSE makes it easier to see that the code and data
1624 are mostly public-domain. (Thanks to James Knight.) The three
1625 non-public-domain files now use the current (3-clause) BSD license
1626 instead of older versions of that license.
1628 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1629 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1630 on editing tz source files (with a mention of Sublime zoneinfo,
1631 thanks to Gilmore Davidson).
1633 The Theory and asia files now mention the 2015 book "The Global
1634 Transformation of Time, 1870-1950", and cite a couple of reviews.
1636 The America/Chicago entry now documents the informal use of US
1637 central time in Fort Pierre, South Dakota. (Thanks to Rick
1638 McDermid, Matt Johnson, and Steve Jones.)
1641 Release 2015g - 2015-10-01 00:39:51 -0700
1643 Changes affecting future timestamps
1645 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1648 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1649 (Thanks to Alexander Krivenyshev.)
1651 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1652 (Thanks to Ken Rylander.)
1654 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
1655 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1656 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
1658 Changes affecting past timestamps
1660 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1662 Changes affecting code
1664 localtime no longer mishandles America/Anchorage after 2037.
1665 (Thanks to Bradley White for reporting the bug.)
1667 On hosts with signed 32-bit time_t, localtime no longer mishandles
1668 Pacific/Fiji after 2038-01-16 14:00 UTC.
1670 The localtime module allows the variables 'timezone', 'daylight',
1671 and 'altzone' to be in common storage shared with other modules,
1672 and declares them in case the system <time.h> does not.
1673 (Problems reported by Kees Dekker.)
1675 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1676 This simplifies the code and is consistent with zdump.c.
1677 (Problem reported by Christos Zoulas.)
1679 Changes affecting documentation
1681 The tzfile man page now documents that transition times denote the
1682 starts (not the ends) of the corresponding time periods.
1683 (Ambiguity reported by Bill Seymour.)
1686 Release 2015f - 2015-08-10 18:06:56 -0700
1688 Changes affecting future timestamps
1690 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1691 The abbreviation remains "KST". (Thanks to Robert Elz.)
1693 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1696 Changes affecting past and future timestamps
1698 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1699 (Thanks to Roman Tudos.)
1701 Changes affecting data format and code
1703 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1704 field of a Rule line should now be '-'; the old values 'even',
1705 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1706 Although the implementation has not changed, these features do not
1707 work in the default installation, they are not used in the data,
1708 and they are now considered obsolescent.
1710 zic now checks that two rules don't take effect at the same time.
1711 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1712 simultaneity are now documented.
1714 The two characters '%z' in a zone format now stand for the UT
1715 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1716 five hours and thirty minutes ahead. This better supports time
1717 zone abbreviations conforming to POSIX.1-2001 and later.
1719 Changes affecting installed data files
1721 Comments for America/Halifax and America/Glace_Bay have been improved.
1722 (Thanks to Brian Inglis.)
1724 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1725 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1726 installed data files for Europe/Simferopol and Europe/Tallinn.
1727 It does not affect timestamps. (Thanks to Howard Hinnant.)
1729 Changes affecting code
1731 zdump and zic no longer warn about valid time zone abbreviations
1734 Some Visual Studio 2013 warnings have been suppressed.
1735 (Thanks to Kees Dekker.)
1737 'date' no longer sets the time of day and its -a, -d, -n and -t
1738 options have been removed. Long obsolescent, the implementation
1739 of these features had porting problems. Builders no longer need
1740 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1741 (Thanks to Kees Dekker for pointing out the problem.)
1743 Changes affecting documentation
1745 The Theory file mentions naming issues earlier, as these seem to be
1746 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1748 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1750 Mention that Herbert Samuel introduced the term "Summer Time".
1753 Release 2015e - 2015-06-13 10:56:02 -0700
1755 Changes affecting future timestamps
1757 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1758 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1760 Assume Cayman Islands will observe DST starting next year, using US rules.
1761 Although it isn't guaranteed, it is the most likely.
1763 Changes affecting data format
1765 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1766 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1768 Changes affecting code
1770 When displaying data, tzselect converts it to the current locale's
1771 encoding if the iconv command works. (Problem reported by random832.)
1773 tzselect no longer mishandles Dominica, fixing a bug introduced
1774 in Release 2014f. (Problem reported by Owen Leibman.)
1776 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1777 This fixes a bug introduced in Release 2014f.
1778 (Problem reported by Leonardo Chiquitto.)
1781 Release 2015d - 2015-04-24 08:09:46 -0700
1783 Changes affecting future timestamps
1785 Egypt will not observe DST in 2015 and will consider canceling it
1786 permanently. For now, assume no DST indefinitely.
1787 (Thanks to Ahmed Nazmy and Tim Parenti.)
1789 Changes affecting past timestamps
1791 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1792 1966-07-01. Also, Yukon's time zone history is documented better.
1793 (Thanks to Brian Inglis and Dennis Ferguson.)
1795 Change affecting past and future time zone abbreviations
1797 The abbreviations for Hawaii-Aleutian standard and daylight times
1798 have been changed from HAST/HADT to HST/HDT, as per US Government
1799 Printing Office style. This affects only America/Adak since 1983,
1800 as America/Honolulu was already using the new style.
1802 Changes affecting code
1804 zic has some minor performance improvements.
1807 Release 2015c - 2015-04-11 08:55:55 -0700
1809 Changes affecting future timestamps
1811 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1812 not 00:00 on April's last Friday. 2015's transition will therefore be on
1813 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1814 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1816 Changes affecting past timestamps
1818 The following changes affect some pre-1991 Chile-related timestamps
1819 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1821 The 1910 transition was January 10, not January 1.
1823 The 1918 transition was September 10, not September 1.
1825 The UT -04 time observed from 1932 to 1942 is now considered to
1826 be standard time, not year-round DST.
1828 Santiago observed DST (UT -03) from 1946-07-15 through
1829 1946-08-31, then reverted to standard time, then switched to -05
1832 Assume transitions before 1968 were at 00:00, since we have no data
1835 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1836 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1838 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1839 and omit all transitions on Pacific/Easter from 1942 through 1946
1840 since we have no data suggesting that they existed.
1842 One more zone has been turned into a link, as it differed
1843 from an existing zone only for older timestamps. As usual,
1844 this change affects UT offsets in pre-1970 timestamps only.
1845 The zone's old contents have been moved to the 'backzone' file.
1846 The affected zone is America/Montreal.
1848 Changes affecting commentary
1850 Mention the TZUpdater tool.
1852 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1855 Release 2015b - 2015-03-19 23:28:11 -0700
1857 Changes affecting future timestamps
1859 Mongolia will start observing DST again this year, from the last
1860 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1861 (Thanks to Ganbold Tsagaankhuu.)
1863 Palestine will start DST on March 28, not March 27. Also,
1864 correct the fall 2014 transition from September 26 to October 24.
1865 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1867 Changes affecting past timestamps
1869 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1870 regression. (Thanks to Stuart Bishop for reporting the problem.)
1872 Some more zones have been turned into links, when they differed
1873 from existing zones only for older timestamps. As usual,
1874 these changes affect UT offsets in pre-1970 timestamps only.
1875 Their old contents have been moved to the 'backzone' file.
1876 The affected zones are: America/Antigua, America/Cayman,
1877 Pacific/Midway, and Pacific/Saipan.
1879 Changes affecting time zone abbreviations
1881 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1884 Changes affecting code
1886 Fix integer overflow bug in reference 'mktime' implementation.
1887 (Problem reported by Jörg Richter.)
1889 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1890 to be used in the same executable as standard-library time_t functions.
1891 (Problems reported by Bradley White.)
1893 Changes affecting commentary
1895 Cite the recent Mexican decree changing Quintana Roo's time zone.
1896 (Thanks to Carlos Raúl Perasso.)
1898 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1900 Update info about Mars time.
1903 Release 2015a - 2015-01-29 22:35:20 -0800
1905 Changes affecting future timestamps
1907 The Mexican state of Quintana Roo, represented by America/Cancun,
1908 will shift from Central Time with DST to Eastern Time without DST
1909 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1911 Chile will not change clocks in April or thereafter; its new standard time
1912 will be its old daylight saving time. This affects America/Santiago,
1913 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1915 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1916 (Thanks to Tim Parenti.)
1918 Changes affecting past timestamps
1920 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1921 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1922 Shanks about time in Iceland between 1837 and 1908.
1924 Some more zones have been turned into links, when they differed
1925 from existing zones only for older timestamps. As usual,
1926 these changes affect UT offsets in pre-1970 timestamps only.
1927 Their old contents have been moved to the 'backzone' file.
1928 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1931 Changes affecting code
1933 tzalloc now scrubs time zone abbreviations compatibly with the way
1934 that tzset always has, by replacing invalid bytes with '_' and by
1935 shortening too-long abbreviations.
1937 tzselect ports to POSIX awk implementations, no longer mishandles
1938 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1939 settings to the user. (Thanks to Stefan Kuhn.)
1941 Changes affecting build procedure
1943 'make check' now checks for links to links in the data.
1944 One such link (for Africa/Asmera) has been fixed.
1945 (Thanks to Stephen Colebourne for pointing out the problem.)
1947 Changes affecting commentary
1949 The leapseconds file commentary now mentions the expiration date.
1950 (Problem reported by Martin Burnicki.)
1952 Update Mexican Library of Congress URL.
1955 Release 2014j - 2014-11-10 17:37:11 -0800
1957 Changes affecting current and future timestamps
1959 Turks & Caicos' switch from US eastern time to UT -04 year-round
1960 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1961 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1963 Changes affecting past timestamps
1965 Many pre-1989 timestamps have been corrected for Asia/Seoul and
1966 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1967 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1968 longer guess that Pyongyang mimicked Seoul time after World War II,
1969 as this is politically implausible.
1971 Some more zones have been turned into links, when they differed
1972 from existing zones only for older timestamps. As usual,
1973 these changes affect UT offsets in pre-1970 timestamps only.
1974 Their old contents have been moved to the 'backzone' file.
1975 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1976 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1977 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1980 Changes affecting commentary
1982 The commentary is less enthusiastic about Shanks as a source,
1983 and is more careful to distinguish UT from UTC.
1986 Release 2014i - 2014-10-21 22:04:57 -0700
1988 Changes affecting future timestamps
1990 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1991 (Thanks to Ken Rylander for the heads-up.) Guess that future
1992 years will use a similar pattern.
1994 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1995 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1996 (Thanks to Kiley Walbom for the heads-up.)
1998 Changes affecting time zone abbreviations
2000 Since Belarus is not changing its clocks even though Moscow is,
2001 the time zone abbreviation in Europe/Minsk is changing from FET
2002 to its more-traditional value MSK on 2014-10-26 at 01:00.
2003 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
2005 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
2006 Indochina, to distinguish it better from ICT (+07).
2008 Changes affecting past timestamps
2010 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
2011 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
2012 authoritative book). Asia/Ho_Chi_Minh has been added to
2013 zone1970.tab, to give tzselect users in Vietnam two choices,
2014 since north and south Vietnam disagreed after our 1970 cutoff.
2016 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
2017 they differed from existing zones only for older timestamps. As
2018 usual, these changes affect pre-1970 timestamps only. Their old
2019 contents have been moved to the 'backzone' file.
2021 Changes affecting code
2023 The time-related library functions now set errno on failure, and
2024 some crashes in the new tzalloc-related library functions have
2025 been fixed. (Thanks to Christos Zoulas for reporting most of
2026 these problems and for suggesting fixes.)
2028 If USG_COMPAT is defined and the requested timestamp is standard time,
2029 the tz library's localtime and mktime functions now set the extern
2030 variable timezone to a value appropriate for that timestamp; and
2031 similarly for ALTZONE, daylight saving time, and the altzone variable.
2032 This change is a companion to the tzname change in 2014h, and is
2033 designed to make timezone and altzone more compatible with tzname.
2035 The tz library's functions now set errno to EOVERFLOW if they fail
2036 because the result cannot be represented. ctime and ctime_r now
2037 return NULL and set errno when a timestamp is out of range, rather
2038 than having undefined behavior.
2040 Some bugs associated with the new 2014g functions have been fixed.
2041 This includes a bug that largely incapacitated the new functions
2042 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
2043 It also includes some uses of uninitialized variables after tzalloc.
2044 The new code uses the standard type 'ssize_t', which the Makefile
2045 now gives porting advice about.
2047 Changes affecting commentary
2049 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
2052 Release 2014h - 2014-09-25 18:59:03 -0700
2054 Changes affecting past timestamps
2056 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
2058 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
2059 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
2061 Some more zones have been turned into links, when they differed
2062 from existing zones only for older timestamps. As usual,
2063 these changes affect UT offsets in pre-1970 timestamps only.
2064 Their old contents have been moved to the 'backzone' file.
2065 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
2066 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
2067 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
2069 Changes affecting code
2071 zdump -V and -v now output gmtoff= values on all platforms,
2072 not merely on platforms defining TM_GMTOFF.
2074 The tz library's localtime and mktime functions now set tzname to a value
2075 appropriate for the requested timestamp, and zdump now uses this
2076 on platforms not defining TM_ZONE, fixing a 2014g regression.
2077 (Thanks to Tim Parenti for reporting the problem.)
2079 The tz library no longer sets tzname if localtime or mktime fails.
2081 zdump -c no longer mishandles transitions near year boundaries.
2082 (Thanks to Tim Parenti for reporting the problem.)
2084 An access to uninitialized data has been fixed.
2085 (Thanks to Jörg Richter for reporting the problem.)
2087 When THREAD_SAFE is defined, the code ports to the C11 memory model.
2088 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
2089 and two threads race to initialize data used by gmtime-like functions.
2090 (Thanks to Andy Heninger for reporting the problems.)
2092 Changes affecting build procedure
2094 'make check' now checks better for properly-sorted data.
2096 Changes affecting documentation and commentary
2098 zdump's gmtoff=N output is now documented, and its isdst=D output
2099 is now documented to possibly output D values other than 0 or 1.
2101 zdump -c's treatment of years is now documented to use the
2102 Gregorian calendar and Universal Time without leap seconds,
2103 and its behavior at cutoff boundaries is now documented better.
2104 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
2106 Programs are now documented to use the proleptic Gregorian calendar.
2107 (Thanks to Alan Barrett for the suggestion.)
2109 Fractional-second GMT offsets have been documented for civil time
2110 in 19th-century Chennai, Jakarta, and New York.
2113 Release 2014g - 2014-08-28 12:31:23 -0700
2115 Changes affecting future timestamps
2117 Turks & Caicos is switching from US eastern time to UT -04
2118 year-round, modeled as a switch on 2014-11-02 at 02:00.
2119 [As noted in 2014j, this switch was later delayed.]
2121 Changes affecting past timestamps
2123 Time in Russia or the USSR before 1926 or so has been corrected by
2124 a few seconds in the following zones: Asia/Irkutsk,
2125 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
2126 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
2127 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
2128 Vladimir Karpinsky.)
2130 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
2131 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
2132 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
2133 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
2134 (Thanks to Stephen Colebourne for pointing to the decree.)
2136 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
2138 A new file 'backzone' contains data which may appeal to
2139 connoisseurs of old timestamps, although it is out of scope for
2140 the tz database, is often poorly sourced, and contains some data
2141 that is known to be incorrect. The new file is not recommended
2142 for ordinary use and its entries are not installed by default.
2143 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
2144 Isle of Man entries.)
2146 Some more zones have been turned into links, when they differed
2147 from existing zones only for older timestamps. As usual,
2148 these changes affect UT offsets in pre-1970 timestamps only.
2149 Their old contents have been moved to the 'backzone' file.
2150 The affected zones are: Africa/Bangui, Africa/Brazzaville,
2151 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
2152 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
2154 Changes affecting code
2156 Unless NETBSD_INSPIRED is defined to 0, the tz library now
2157 supplies functions for creating and using objects that represent
2158 timezones. The new functions are tzalloc, tzfree, localtime_rz,
2159 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
2160 time2posix_z. They are intended for performance: for example,
2161 localtime_rz (unlike localtime_r) is trivially thread-safe without
2162 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
2163 functions, and to Alan Barrett and Jonathan Lennox for helping to
2166 zdump now builds with the tz library unless USE_LTZ is defined to 0,
2167 This lets zdump use tz features even if the system library lacks them.
2168 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
2169 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
2171 zdump now uses localtime_rz if available, as it's significantly faster,
2172 and it can help zdump better diagnose invalid timezone names.
2173 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
2174 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
2175 not available, zdump now uses localtime_r and tzset if available,
2176 as this is a bit cleaner and faster than plain localtime. Compile
2177 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
2178 lacks these two functions.
2180 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
2181 Although not needed for tz's own applications, which are single-threaded,
2182 this supports POSIX better if the tz library is used in multithreaded apps.
2184 Some crashes have been fixed when zdump or the tz library is given
2185 invalid or outlandish input.
2187 The tz library no longer mishandles leap seconds on platforms with
2188 unsigned time_t in timezones that lack ordinary transitions after 1970.
2190 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
2191 already defined, to make it easier to configure on common platforms.
2192 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
2194 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
2195 assumes that reading uninitialized memory yields garbage values
2196 but does not cause other problems such as traps.
2198 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
2199 more likely to guess right for ambiguous timestamps near
2200 transitions where tm_isdst does not change.
2202 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
2203 strftime_l for compatibility with recent versions of POSIX.
2204 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
2205 to 1 on recent POSIX versions, and to 0 otherwise.
2207 tzselect -c now uses a hybrid distance measure that works better
2208 in Africa. (Thanks to Alan Barrett for noting the problem.)
2210 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
2211 or when time_tz is defined.
2213 When HAVE_UTMPX_H is set the 'date' command now builds on systems
2214 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
2215 the date it updates the wtmpx file if _PATH_WTMPX is defined.
2216 This affects GNU/Linux and similar systems.
2218 For easier maintenance later, some C code has been simplified,
2219 some lint has been removed, and the code has been tweaked so that
2220 plain 'make' is more likely to work.
2222 The C type 'bool' is now used for boolean values, instead of 'int'.
2224 The long-obsolete LOCALE_HOME code has been removed.
2226 The long-obsolete 'gtime' function has been removed.
2228 Changes affecting build procedure
2230 'zdump' no longer links in ialloc.o, as it's not needed.
2232 'make check_time_t_alternatives' no longer assumes GNU diff.
2234 Changes affecting distribution tarballs
2236 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
2237 the tzdata tarball instead of the tzcode tarball, since they help
2238 maintain the data. The NEWS and Theory files are now also
2239 distributed in the tzdata tarball, as they're relevant for data.
2240 (Thanks to Alan Barrett for pointing this out.) Also, the
2241 leapseconds.awk file is no longer distributed in the tzcode
2242 tarball, since it belongs in the tzdata tarball (where 2014f
2243 inadvertently also distributed it).
2245 Changes affecting documentation and commentary
2247 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
2248 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
2251 The man pages have been updated to use function prototypes,
2252 to document thread-safe variants like localtime_r, and to document
2253 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
2256 The fields in Link lines have been renamed to be more descriptive
2257 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
2258 and LINK-TO has become LINK-NAME.
2260 tz-link.htm mentions the IETF's tzdist working group; Windows
2261 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
2263 Some broken URLs have been fixed in the commentary. (Thanks to
2266 Commentary about Philippines DST has been updated, and commentary
2267 on pre-1970 time in India has been added.
2270 Release 2014f - 2014-08-05 17:42:36 -0700
2272 Changes affecting future timestamps
2274 Russia will subtract an hour from most of its time zones on 2014-10-26
2275 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
2276 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
2277 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
2278 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
2279 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
2280 (Europe/Samara) are not changing their clocks. The changed zones are
2281 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
2282 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
2283 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
2284 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
2285 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
2286 but not its UTC offset. Two zones are added: Asia/Chita (split
2287 from Asia/Yakutsk, and also with two hours subtracted) and
2288 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
2289 subtracted). (Thanks to Tim Parenti for much of the above.)
2291 Changes affecting time zone abbreviations
2293 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
2294 and similarly for the other Australian zones. That is, for eastern
2295 standard and daylight saving time the abbreviations are AEST and AEDT
2296 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
2297 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
2298 This change does not affect UT offsets, only time zone abbreviations.
2299 (Thanks to Rich Tibbett and many others.)
2301 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
2302 effective 2014-10-26 at 02:00 local time.
2304 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
2305 has been changed from URUT to XJT. (Thanks to Luther Ma.)
2307 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
2308 Similarly, prefer EET/EEST for eastern European time in Russia.
2310 Change time zone abbreviations in (western) Samoa to use "ST" and
2311 "DT" suffixes, as this is more likely to match common practice.
2312 Prefix "W" to (western) Samoa time when its standard-time offset
2313 disagrees with that of American Samoa.
2315 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
2317 Time zone abbreviations have been updated for Japan's two time
2318 zones used 1896-1937. JWST now stands for Western Standard
2319 Time, and JCST for Central Standard Time (formerly this was CJT).
2320 These abbreviations are now used for time in Korea, Taiwan,
2321 and Sakhalin while controlled by Japan.
2323 Changes affecting past timestamps
2325 China's five zones have been simplified to two, since the post-1970
2326 differences in the other three seem to have been imaginary. The
2327 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
2328 removed; backwards-compatibility links still work, albeit with
2329 different behaviors for timestamps before May 1980. Asia/Urumqi's
2330 1980 transition to UT +08 has been removed, so that it is now at
2331 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
2332 Treindl sent helpful translations of two papers by Guo Qingsheng.)
2334 Some zones have been turned into links, when they differed from existing
2335 zones only for older UT offsets where data entries were likely invented.
2336 These changes affect UT offsets in pre-1970 timestamps only. This is
2337 similar to the change in release 2013e, except this time for western
2338 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
2339 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
2340 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
2341 Atlantic/St_Helena. This also affects the backwards-compatibility
2342 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
2343 Tim Parenti, and David Patte for reporting problems in earlier
2344 versions of this change.)
2346 Asia/Shanghai's pre-standard-time UT offset has been changed from
2347 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
2348 transition to standard time has been changed from 1928 to 1901.
2350 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
2351 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
2352 In 1946 it observed DST from 05-15 through 09-30; in 1947
2353 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
2354 (Thanks to Yu-Cheng Chuang.)
2356 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
2358 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
2359 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
2361 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
2362 period from 1911 to 1950.
2364 Pacific/Chatham has been changed to New Zealand standard time plus
2365 45 minutes for the period before 1957, reflecting a 1956 remark in
2366 the New Zealand parliament.
2368 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
2369 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
2370 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
2371 not 04-06 at 02:00; and there was no DST in 1920.
2373 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
2375 Time in Russia before 1927 or so has been corrected by a few seconds in
2376 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
2377 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
2378 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
2379 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
2381 Changes affecting data format
2383 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
2384 The new file's extended format allows multiple country codes per zone.
2385 The older file is still installed but is deprecated; its format is
2386 not changing and it will still be distributed for a while, but new
2387 applications should use the new file.
2389 The new file format simplifies maintenance of obscure locations.
2390 To test this, it adds coverage for the Crozet Islands and the
2391 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
2393 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
2394 It is still ASCII now, but commentary about the switch has been added.
2395 The new file 'zone1970.tab' already uses UTF-8.
2397 Changes affecting code
2399 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
2400 is defined. (Thanks to Elliott Hughes for reporting the problem.)
2402 'zic' no longer mishandles input when ignoring case in locales that
2403 are not compatible with English, e.g., unibyte Turkish locales when
2404 compiled with HAVE_GETTEXT.
2406 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
2407 they no longer use ASCII '-' as if it were a dash.
2409 'zic' now rejects output file names that contain '.' or '..' components.
2410 (Thanks to Tim Parenti for reporting the problem.)
2412 'zic -v' now warns about output file names that do not follow
2413 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
2414 David Olson for starting the ball rolling on this.)
2416 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
2418 Changes affecting build procedure
2420 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
2421 (Thanks to John Cochran.)
2423 Changes affecting documentation and commentary
2425 The 'Theory' file documents legacy names, the longstanding
2426 exceptions to the POSIX-inspired file name rules.
2428 The 'zic' documentation clarifies the role of time types when
2429 interpreting dates. (Thanks to Arthur David Olson.)
2431 Documentation and commentary now prefer UTF-8 to US-ASCII,
2432 allowing the use of proper accents in foreign words and names.
2433 Code and data have not changed because of this. (Thanks to
2434 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
2437 Non-HTML documentation and commentary now use plain-text URLs instead of
2438 HTML insertions, and are more consistent about bracketing URLs when they
2439 are not already surrounded by white space. (Thanks to suggestions by
2442 There is new commentary about Xujiahui Observatory, the five time-zone
2443 project in China from 1918 to 1949, timekeeping in Japanese-occupied
2444 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
2445 warlord Jin Shuren in the data.
2447 Commentary about the coverage of each Russian zone has been standardized.
2448 (Thanks to Tim Parenti.)
2450 There is new commentary about contemporary timekeeping in Ethiopia.
2452 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
2454 There is new commentary about time in Poland in 1919.
2456 Proper credit has been given to DST inventor George Vernon Hudson.
2458 Commentary about time in Metlakatla, AK and Resolute, NU has been
2459 improved, with a new source for the former.
2461 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
2464 Commentary about permanent Antarctic bases has been updated.
2466 Several typos have been corrected. (Thanks to Tim Parenti for
2467 contributing some of these fixes.)
2469 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
2470 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
2471 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
2472 (Thanks to a heads-up from Dirkjan Ochtman.)
2474 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2475 have been removed. These obsolescent US Naval Observatory entries were no
2476 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
2479 Release 2014e - 2014-06-12 21:53:52 -0700
2481 Changes affecting near-future timestamps
2483 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2484 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
2485 switch to standard time at 24:00 the last Thursday before Ramadan, and
2486 back to DST at 00:00 the first Friday after Ramadan.
2488 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
2489 to Milamber Space Network.) Guess that from 2015 on Morocco will
2490 temporarily switch to standard time at 03:00 the last Saturday before
2491 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2493 Changes affecting past timestamps
2495 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2496 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
2497 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2498 in 1991. (Thanks to Hank W. for reporting the problems.)
2500 Changes affecting commentary
2502 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2503 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2504 removes stale pointers to World Time Explorer and WORLDTIME.
2507 Release 2014d - 2014-05-27 21:34:40 -0700
2509 Changes affecting code
2511 zic no longer generates files containing timestamps before the Big Bang.
2512 This works around GNOME glib bug 878
2513 <https://gitlab.gnome.org/GNOME/glib/issues/878>
2514 (Thanks to Leonardo Chiquitto for reporting the bug, and to
2515 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2517 Changes affecting documentation
2519 tz-link.htm now mentions GNOME.
2522 Release 2014c - 2014-05-13 07:44:13 -0700
2524 Changes affecting near-future timestamps
2526 Egypt observes DST starting 2014-05-15 at 24:00.
2527 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2528 Details have not been announced, except that DST will not be observed
2529 during Ramadan. Guess that DST will stop during the same Ramadan dates as
2530 Morocco, and that Egypt's future spring and fall transitions will be the
2531 same as 2010 when it last observed DST, namely April's last Friday at
2532 00:00 to September's last Thursday at 23:00 standard time. Also, guess
2533 that Ramadan transitions will be at 00:00 standard time.
2535 Changes affecting code
2537 zic now generates transitions for minimum time values, eliminating guesswork
2538 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
2540 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
2542 Changes affecting commentary and documentation
2544 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
2547 Release 2014b - 2014-03-24 21:28:50 -0700
2549 Changes affecting near-future timestamps
2551 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2552 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
2554 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
2555 Bengt-Inge Larsson.) This is currently an approximation; a better version
2556 will require the zic and localtime fixes mentioned below, and the plan is
2557 to wait for a while until at least the zic fixes propagate.
2559 Changes affecting code
2561 'zic' and 'localtime' no longer reject locations needing four transitions
2562 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
2563 Also, 'zic' avoids some unlikely failures due to integer overflow.
2565 Changes affecting build procedure
2567 'make check' now detects Rule lines defined but never used.
2568 The NZAQ rules, an instance of this problem, have been removed.
2570 Changes affecting commentary and documentation
2572 Fix Tuesday/Thursday typo in description of time in Israel.
2573 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2575 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
2576 to Donald MacQueen.) Instead, the Microsoft Windows Store app
2577 library supports them.
2579 Add comments about Johnston Island time in the 1960s.
2580 (Thanks to Lyle McElhaney.)
2582 Morocco's 2014 DST start will be as predicted.
2583 (Thanks to Sebastien Willemijns.)
2586 Release 2014a - 2014-03-07 23:30:29 -0800
2588 Changes affecting near-future timestamps
2590 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
2591 the heads-up, and to Tim Parenti for simplifying the update.)
2593 Changes affecting past timestamps
2595 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2596 (Thanks to Steffen Thorsen.)
2598 Ukraine switched from Moscow to Eastern European time on 1990-07-01
2599 (not 1992-01-01), and observed DST during the entire next winter.
2600 (Thanks to Vladimir in Moscow via Alois Treindl.)
2602 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2603 (Thanks to Avigdor Finkelstein.)
2605 Changes affecting code
2607 A uninitialized-storage bug in 'localtime' has been fixed.
2608 (Thanks to Logan Chien.)
2610 Changes affecting the build procedure
2612 The settings for 'make check_web' now default to Ubuntu 13.10.
2614 Changes affecting commentary and documentation
2616 The boundary of the US Pacific time zone is given more accurately.
2617 (Thanks to Alan Mintz.)
2619 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
2621 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
2623 Better descriptions of countries with same time zone history as
2624 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
2626 Several changes affect tz-link.htm, the main web page.
2628 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2631 Mention xCal (Internet RFC 6321) and jCal.
2633 Microsoft has some support for tz database names.
2635 CLDR data formats include both XML and JSON.
2637 Mention Maggiolo's map of solar vs standard time.
2638 (Thanks to Arthur David Olson.)
2640 Mention TZ4Net. (Thanks to Matt Johnson.)
2642 Mention the timezone-olson Haskell package.
2644 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
2646 Remove moribund links to daylight-savings-time.info and to
2647 Simple Timer + Clocks.
2649 Update two links. (Thanks to Oscar van Vlijmen.)
2651 Fix some formatting glitches, e.g., remove random newlines from
2652 abbr elements' title attributes.
2655 Release 2013i - 2013-12-17 07:25:23 -0800
2657 Changes affecting near-future timestamps:
2659 Jordan switches back to standard time at 00:00 on December 20, 2013.
2660 The 2006-2011 transition schedule is planned to resume in 2014.
2661 (Thanks to Steffen Thorsen.)
2663 Changes affecting past timestamps:
2665 In 2004, Cuba began DST on March 28, not April 4.
2666 (Thanks to Steffen Thorsen.)
2668 Changes affecting code
2670 The compile-time flag NOSOLAR has been removed, as nowadays the
2671 benefit of slightly shrinking runtime table size is outweighed by the
2672 cost of disallowing potential future updates that exceed old limits.
2674 Changes affecting documentation and commentary
2676 The files solar87, solar88, and solar89 are no longer distributed.
2677 They were a negative experiment - that is, a demonstration that
2678 tz data can represent solar time only with some difficulty and error.
2679 Their presence in the distribution caused confusion, as Riyadh
2680 civil time was generally not solar time in those years.
2682 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2685 Release 2013h - 2013-10-25 15:32:32 -0700
2687 Changes affecting current and future timestamps:
2689 Libya has switched its UT offset back to +02 without DST, instead
2690 of +01 with DST. (Thanks to Even Scharning.)
2692 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2693 (Thanks to Gwillim Law.)
2695 Changes affecting future timestamps:
2697 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2698 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2699 (Thanks to Steffen Thorsen.)
2701 Add entries for DST transitions in Morocco in the year 2038.
2702 This avoids some year-2038 glitches introduced in 2013g.
2703 (Thanks to Yoshito Umaoka for reporting the problem.)
2705 Changes affecting API
2707 The 'tzselect' command no longer requires the 'select' command,
2708 and should now work with /bin/sh on more platforms. It also works
2709 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2710 Patrick 'P. J.' McDermott and Alan Barrett.)
2712 Changes affecting code
2714 Fix localtime overflow bugs with 32-bit unsigned time_t.
2716 zdump no longer assumes sscanf returns maximal values on overflow.
2718 Changes affecting the build procedure
2720 The builder can specify which programs to use, if any, instead of
2721 'ar' and 'ranlib', and libtz.a is now built locally before being
2722 installed. (Thanks to Michael Forney.)
2724 A dependency typo in the 'zdump' rule has been fixed.
2725 (Thanks to Andrew Paprocki.)
2727 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2728 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2730 'make clean' no longer removes 'leapseconds', since it's
2731 host-independent and is part of the distribution.
2733 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2735 Changes affecting documentation and commentary
2737 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2738 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2740 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2741 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2742 longer maintained) and for old advisories. SOFA now does C.
2744 Release 2013g - 2013-09-30 21:08:26 -0700
2746 Changes affecting current and near-future timestamps
2748 Morocco now observes DST from the last Sunday in March to the last
2749 Sunday in October, not April to September respectively. (Thanks
2750 to Steffen Thorsen.)
2752 Changes affecting 'zic'
2754 'zic' now runs on platforms that lack both hard links and symlinks.
2755 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2756 Also, fix some bugs on platforms that lack hard links but have symlinks.
2758 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2759 to predict the far future, fixing a bug introduced in 2013e.
2761 Changes affecting the build procedure
2763 The 'leapseconds' file is again put into the tzdata tarball.
2764 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2765 Matt Burgess and Ian Abbott.) The timestamps of these and other
2766 dependent files in tarballs are adjusted more consistently.
2768 Changes affecting documentation and commentary
2770 The README file is now part of the data tarball as well as the code.
2771 It now states that files are public domain unless otherwise specified.
2772 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2773 Its details about the 1989 release moved to a place of honor near
2777 Release 2013f - 2013-09-24 23:37:36 -0700
2779 Changes affecting near-future timestamps
2781 Tocantins will very likely not observe DST starting this spring.
2782 (Thanks to Steffen Thorsen.)
2784 Jordan will likely stay at UT +03 indefinitely, and will not fall
2787 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2789 Changes affecting API
2791 The types of the global variables 'timezone' and 'altzone' (if present)
2792 have been changed back to 'long'. This is required for 'timezone'
2793 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2794 These variables were originally 'long' in the tz code, but were
2795 mistakenly changed to 'time_t' in 1987; nobody reported the
2796 incompatibility until now. The difference matters on x32, where
2797 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2799 Changes affecting the build procedure
2801 Avoid long strings in leapseconds.awk to work around a mawk bug.
2802 (Thanks to Cyril Baurand.)
2804 Changes affecting documentation and commentary
2806 New file 'NEWS' that contains release notes like this one.
2808 Paraguay's law does not specify DST transition time; 00:00 is customary.
2809 (Thanks to Waldemar Villamayor-Venialbo.)
2811 Minor capitalization fixes.
2813 Changes affecting version-control only
2815 The experimental GitHub repository now contains annotated and
2816 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2817 Releases are tagged starting with 2012e; earlier releases were
2818 done differently, and tags would either not have a simple name or
2819 not exactly match what was released.
2821 'make set-timestamps' is now simpler and a bit more portable.
2824 Release 2013e - 2013-09-19 23:50:04 -0700
2826 Changes affecting near-future timestamps
2828 This year Fiji will start DST on October 27, not October 20.
2829 (Thanks to David Wheeler for the heads-up.) For now, guess that
2830 Fiji will continue to spring forward the Sunday before the fourth
2833 Changes affecting current and future time zone abbreviations
2835 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2836 time zone abbreviations since 1932. (Thanks to George Ziegler,
2837 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2838 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2839 Asia/Makassar, and Asia/Pontianak.
2841 Use ART (UT -03, standard time), rather than WARST (also -03, but
2842 daylight saving time) for San Luis, Argentina since 2009.
2844 Changes affecting Godthåb timestamps after 2037 if version mismatch
2846 Allow POSIX-like TZ strings where the transition time's hour can
2847 range from -167 through 167, instead of the POSIX-required 0
2848 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2849 new Fiji rules. This is a more-compact way to represent
2850 far-future timestamps for America/Godthab, America/Santiago,
2851 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2852 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2853 this change. (Derived from a suggestion by Arthur David Olson.)
2855 Allow POSIX-like TZ strings where daylight saving time is in
2856 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2857 Argentina Summer Time all year. This supports a more-compact way
2858 to represent the 2013d data for America/Argentina/San_Luis.
2859 Because of the change for San Luis noted above this change does not
2860 affect the current data. (Thanks to Andrew Main (Zefram) for
2861 suggestions that improved this change.)
2863 Where these two TZ changes take effect, there is a minor extension
2864 to the tz file format in that it allows new values for the
2865 embedded TZ-format string, and the tz file format version number
2866 has therefore been increased from 2 to 3 as a precaution.
2867 Version-2-based client code should continue to work as before for
2868 all timestamps before 2038. Existing version-2-based client code
2869 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2870 files, and typically works in practice even for timestamps after
2871 2037; the only known exception is America/Godthab.
2873 Changes affecting timestamps before 1970
2875 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2876 some errors before 1947.
2878 Some zones have been turned into links, when they differ from existing
2879 zones only in older data entries that were likely invented or that
2880 differ only in LMT or transitions from LMT. These changes affect
2881 only timestamps before 1943. The affected zones are:
2882 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2883 America/Grenada, America/Guadeloupe, America/Marigot,
2884 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2885 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2886 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2887 confirming that the old Europe/Vaduz zone was wrong and the new
2888 link is better for WWII-era times.)
2890 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2891 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2894 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2895 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2898 Change the date of the circa-1850 Zurich transition from 1849-09-12
2899 to 1853-07-16, overriding Shanks with data from Messerli about
2900 postal and telegraph time in Switzerland.
2902 Changes affecting time zone abbreviations before 1970
2904 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2905 as Jakarta was called Batavia back then.
2907 Changes affecting API
2909 The 'zic' command now outputs a dummy transition when far-future
2910 data can't be summarized using a TZ string, and uses a 402-year
2911 window rather than a 400-year window. For the current data, this
2912 affects only the Asia/Tehran file. It does not affect any of the
2913 timestamps that this file represents, so zdump outputs the same
2914 information as before. (Thanks to Andrew Main (Zefram).)
2916 The 'date' command has a new '-r' option, which lets you specify
2917 the integer time to display, a la FreeBSD.
2919 The 'tzselect' command has two new options '-c' and '-n', which lets you
2920 select a zone based on latitude and longitude.
2922 The 'zic' command's '-v' option now warns about constructs that
2923 require the new version-3 binary file format. (Thanks to Arthur
2924 David Olson for the suggestion.)
2926 Support for floating-point time_t has been removed.
2927 It was always dicey, and POSIX no longer requires it.
2928 (Thanks to Eric Blake for suggesting to the POSIX committee to
2929 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2930 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2931 bugs and elucidating some of the corners of the old floating-point
2934 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2935 changed back to the old practice of using 'long' to represent UT
2936 offsets. This had been inadvertently and mistakenly changed to
2937 'int_fast32_t'. (Thanks to Christos Zoulas.)
2939 The code avoids undefined behavior on integer overflow in some
2940 more places, including gmtime, localtime, mktime and zdump.
2942 Changes affecting the zdump utility
2944 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2945 "UTC" does not make sense for timestamps that predate the introduction
2946 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2947 for clarifying UT vs UTC.)
2949 Data changes affecting behavior of tzselect and similar programs
2951 Country code BQ is now called the more-common name "Caribbean Netherlands"
2952 rather than the more-official "Bonaire, St Eustatius & Saba".
2954 Remove from zone.tab the names America/Montreal, America/Shiprock,
2955 and Antarctica/South_Pole, as they are equivalent to existing
2956 same-country-code zones for post-1970 timestamps. The data entries for
2957 these names are unchanged, so the names continue to work as before.
2959 Changes affecting code internals
2961 zic -c now runs way faster on 64-bit hosts when given large numbers.
2963 zic now uses vfprintf to avoid allocating and freeing some memory.
2965 tzselect now computes the list of continents from the data,
2966 rather than have it hard-coded.
2968 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2970 Changes affecting the build procedure
2972 The 'leapseconds' file is now generated automatically from a
2973 new file 'leap-seconds.list', which is a copy of
2974 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2975 A new source file 'leapseconds.awk' implements this.
2976 The goal is simplification of the future maintenance of 'leapseconds'.
2978 When building the 'posix' or 'right' subdirectories, if the
2979 subdirectory would be a copy of the default subdirectory, it is
2980 now made a symbolic link if that is supported. This saves about
2981 2 MB of file system space.
2983 The links America/Shiprock and Antarctica/South_Pole have been
2984 moved to the 'backward' file. This affects only nondefault builds
2985 that omit 'backward'.
2987 Changes affecting version-control only
2989 .gitignore now ignores 'date'.
2991 Changes affecting documentation and commentary
2993 Changes to the 'tzfile' man page
2995 It now mentions that the binary file format may be extended in
2996 future versions by appending data.
2998 It now refers to the 'zdump' and 'zic' man pages.
3000 Changes to the 'zic' man page
3002 It lists conditions that elicit a warning with '-v'.
3004 It says that the behavior is unspecified when duplicate names
3005 are given, or if the source of one link is the target of another.
3007 Its examples are updated to match the latest data.
3009 The definition of white space has been clarified slightly.
3010 (Thanks to Michael Deckers.)
3012 Changes to the 'Theory' file
3014 There is a new section about the accuracy of the tz database,
3015 describing the many ways that errors can creep in, and
3016 explaining why so many of the pre-1970 timestamps are wrong or
3017 misleading (thanks to Steve Allen, Lester Caine, and Garrett
3018 Wollman for discussions that contributed to this).
3020 The 'Theory' file describes LMT better (this follows a
3021 suggestion by Guy Harris).
3023 It refers to the 2013 edition of POSIX rather than the 2004 edition.
3025 It's mentioned that excluding 'backward' should not affect the
3026 other data, and it suggests at least one zone.tab name per
3027 inhabited country (thanks to Stephen Colebourne).
3029 Some longstanding restrictions on names are documented, e.g.,
3030 'America/New_York' precludes 'America/New_York/Bronx'.
3032 It gives more reasons for the 1970 cutoff.
3034 It now mentions which time_t variants are supported, such as
3035 signed integer time_t. (Thanks to Paul Goyette for reporting
3036 typos in an experimental version of this change.)
3038 (Thanks to Philip Newton for correcting typos in these changes.)
3040 Documentation and commentary is more careful to distinguish UT in
3041 general from UTC in particular. (Thanks to Steve Allen.)
3043 Add a better source for the Zurich 1894 transition.
3044 (Thanks to Pierre-Yves Berger.)
3046 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
3049 Release 2013d - 2013-07-05 07:38:01 -0700
3051 Changes affecting future timestamps:
3053 Morocco's midsummer transitions this year are July 7 and August 10,
3054 not July 9 and August 8. (Thanks to Andrew Paprocki.)
3056 Israel now falls back on the last Sunday of October.
3057 (Thanks to Ephraim Silverberg.)
3059 Changes affecting past timestamps:
3061 Specify Jerusalem's location more precisely; this changes the pre-1880
3064 Changing affecting metadata only:
3066 Fix typos in the entries for country codes BQ and SX.
3068 Changes affecting code:
3070 Rework the code to fix a bug with handling Australia/Macquarie on
3071 32-bit hosts (thanks to Arthur David Olson).
3073 Port to platforms like NetBSD, where time_t can be wider than long.
3075 Add support for testing time_t types other than the system's.
3076 Run 'make check_time_t_alternatives' to try this out.
3077 Currently, the tests fail for unsigned time_t;
3078 this should get fixed at some point.
3080 Changes affecting documentation and commentary:
3082 Deemphasize the significance of national borders.
3084 Update the zdump man page.
3086 Remove obsolete NOID comment (thanks to Denis Excoffier).
3088 Update several URLs and comments in the web pages.
3090 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
3092 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
3095 Release 2013c - 2013-04-19 16:17:40 -0700
3097 Changes affecting current and future timestamps:
3099 Palestine observed DST starting March 29, 2013. (Thanks to
3100 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
3101 with the predicted rules being the last Thursday in March at 24:00
3102 to the first Friday on or after September 21 at 01:00.
3104 Assume that the recent change to Paraguay's DST rules is permanent,
3105 by moving the end of DST to the 4th Sunday in March every year.
3106 (Thanks to Carlos Raúl Perasso.)
3108 Changes affecting past timestamps:
3110 Fix some historical data for Palestine to agree with that of
3111 timeanddate.com, as follows:
3113 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
3116 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
3119 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
3121 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
3123 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
3125 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
3127 Fix times of habitation for Macquarie to agree with the Tasmania
3128 Parks & Wildlife Service history, which indicates that permanent
3129 habitation was 1899-1919 and 1948 on.
3131 Changing affecting metadata only:
3133 Macquarie Island is politically part of Australia, not Antarctica.
3134 (Thanks to Tobias Conradi.)
3136 Sort Macquarie more-consistently with other parts of Australia.
3137 (Thanks to Tim Parenti.)
3140 Release 2013b - 2013-03-10 22:33:40 -0700
3142 Changes affecting current and future timestamps:
3144 Haiti uses US daylight-saving rules this year, and presumably future years.
3145 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
3147 Paraguay will end DST on March 24 this year.
3148 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
3150 Morocco does not observe DST during Ramadan;
3151 try to predict Ramadan in Morocco as best we can.
3152 (Thanks to Erik Homoet for the heads-up.)
3154 Changes affecting commentary:
3156 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
3157 Update URL for Solaris. Mention Internet RFC 6557.
3158 Update Internet RFCs 2445->5545, 2822->5322.
3159 Switch from FTP to HTTP for Internet RFCs.
3162 Release 2013a - 2013-02-27 09:20:35 -0800
3164 Change affecting binary data format:
3166 The zone offset at the end of version-2-format zone files is now
3167 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
3169 Changes affecting current and future timestamps:
3171 Chile's 2013 rules, and we guess rules for 2014 and later, will be
3172 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
3173 (Thanks to Steffen Thorsen and Robert Elz.)
3175 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
3176 (Thanks to Tobias Conradi and Arthur David Olson.)
3178 Many changes affect historical timestamps before 1940.
3179 These were deduced from: Milne J. Civil time. Geogr J. 1899
3180 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
3182 Changes affecting the code:
3184 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
3185 the data). (Thanks to Arthur David Olson.)
3187 Fix localtime bug when time_t is unsigned and data files were generated
3188 by a signed time_t system. (Thanks to Doug Bailey for reporting and
3189 to Arthur David Olson for fixing.)
3191 Allow the email address for bug reports to be set by the packager.
3192 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
3194 Update HTML checking to be compatible with Ubuntu 12.10.
3196 Check that files are a safe subset of ASCII. At some point we may
3197 relax this requirement to a safe subset of UTF-8. Without the
3198 check, some non-UTF-8 encodings were leaking into the distribution.
3202 Restore a comment about copyright notices that was inadvertently deleted.
3203 (Thanks to Arthur David Olson.)
3205 Improve the commentary about which districts observe what times
3206 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.)
3208 Add web page links to tz.js.
3210 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
3213 Release 2012j - 2012-11-12 18:34:49 -0800
3215 Libya moved to CET this weekend, but with DST planned next year.
3216 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
3218 Signatures now have the extension .asc, not .sign, as that's more
3219 standard. (Thanks to Phil Pennock.)
3221 The output of 'zdump --version', and of 'zic --version', now
3222 uses a format that is more typical for --version.
3223 (Thanks to Joseph S. Myers.)
3225 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
3226 now uses tz@iana.org rather than the old elsie address.
3228 zic -v now complains about abbreviations that are less than 3
3229 or more than 6 characters, as per Posix. Formerly, it checked
3230 for abbreviations that were more than 3.
3232 'make public' no longer puts its temporary directory under /tmp,
3233 and uses the just-built zic rather than the system zic.
3235 Various fixes to documentation and commentary.
3238 Release 2012i - 2012-11-03 12:57:09 -0700
3240 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
3242 Linker flags can now be specified via LDFLAGS.
3243 AWK now defaults to 'awk', not 'nawk'.
3244 The shell in tzselect now defaults to /bin/bash, but this can
3245 be overridden by specifying KSHELL.
3246 The main web page now mentions the unofficial GitHub repository.
3247 (Thanks to Mike Frysinger.)
3249 Tarball signatures can now be built by running 'make signatures'.
3250 There are also new makefile rules 'tarballs', 'check_public', and
3251 separate makefile rules for each tarball and signature file.
3252 A few makefile rules are now more portable to strict POSIX.
3254 The main web page now lists the canonical IANA URL.
3257 Release 2012h - 2012-10-26 22:49:10 -0700
3259 Bahia no longer has DST. (Thanks to Kelley Cook.)
3261 Tocantins has DST. (Thanks to Rodrigo Severo.)
3263 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
3265 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
3269 More C modernization, except that at Arthur David Olson's suggestion
3270 the instances of 'register' were kept.
3273 Release 2012g - 2012-10-17 20:59:45 -0700
3275 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
3277 Palestine fall 2012. (Thanks to Steffen Thorsen.)
3281 To attack the version-number problem, this release ships the file
3282 'Makefile' (which contains the release number) in both the tzcode and
3283 the tzdata tarballs. The two Makefiles are identical, and should be
3284 identical in any matching pair of tarballs, so it shouldn't matter
3285 which order you extract the tarballs. Perhaps we can come up with a
3286 better version-number scheme at some point; this scheme does have the
3287 virtue of not adding more files.
3290 Release 2012f - 2012-09-12 23:17:03 -0700
3292 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
3293 20 this year. (Thanks to Steffen Thorsen.)
3296 Release 2012e - 2012-08-02 20:44:55 -0700
3298 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
3299 (Thanks to Steffen Thorsen.)
3301 * Use a single version number for both code and data.
3303 * .gitignore: New file.
3305 * Remove trailing white space.
3308 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
3310 Changes for Morocco's timestamps, which take effect in a couple of
3311 hours, along with infrastructure changes to accommodate how the tz
3312 code and data are released on IANA.
3315 Release data2012c - 2012-03-27 12:17:25 -0400
3318 Summer time changes for Morocco (to start late April 2012)
3321 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
3324 Haiti following US/Canada rules for 2012 (and we're assuming,
3325 for now anyway, for the future).
3328 Release 2012b - 2012-03-02 12:29:15 +0700
3330 There is just one change to tzcode2012b (compared with 2012a):
3331 the Makefile that was accidentally included with 2012a has been
3332 replaced with the version that should have been there, which is
3333 identical with the previous version (from tzcode2011i).
3335 There are just two changes in tzdata2012b compared with 2012a.
3337 Most significantly, summer time in Cuba has been delayed 3 weeks
3338 (now starts April 1 rather than March 11). Since Mar 11 (the old start
3339 date, as listed in 2012a) is just a little over a week away, this
3342 Less importantly, an excess tab in one of the changes in zone.tab
3343 in 2012a has been removed.
3346 Release 2012a - 2012-03-01 18:28:10 +0700
3348 The changes in tzcode2012a (compared to the previous version, 2011i)
3349 are entirely to the README and tz-art.htm and tz-link.htm files, if
3350 none of those concern you, you can ignore the code update. The changes
3351 reflect the changed addresses for the mailing list and the code and
3352 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
3353 has been added to tz-link.htm).
3355 In tzdata2012a (compared to the previous release, which was 2011n)
3356 the major changes are:
3357 Chile 2011/2012 and 2012/2013 summer time date adjustments.
3358 Falkland Islands onto permanent summer time (we're assuming for the
3359 foreseeable future, though 2012 is all we're fairly certain of.)
3360 Armenia has abolished Summer Time.
3361 Tokelau jumped the International Date Line back last December
3362 (just the same as their near neighbour, Samoa).
3363 America/Creston is a new zone for a small area of British Columbia
3364 There will be a leapsecond 2012-06-30 23:59:60 UTC.
3366 Other minor changes are:
3367 Corrections to 1918 Canadian summer time end dates.
3368 Updated URL for UK time zone history (in comments)
3369 A few typos in Le Corre's list of free French place names (comments)
3372 Release data2011n - 2011-10-30 14:57:54 +0700
3374 There are three changes of note - most urgently, Cuba (America/Havana)
3375 has extended summer time by two weeks, now to end on Nov 13, rather than
3376 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
3377 (Europe/Tiraspol) decided not to split from the rest of Moldova after
3378 all, and consequently that zone has been removed (again) and reinstated
3379 in the "backward" file as a link to Europe/Chisinau. And third, the
3380 end date for Fiji's summer time this summer was moved forward from the
3381 earlier planned Feb 26, to Jan 22.
3383 Apart from that, Moldova (MD) returns to a single entry in zone.tab
3384 (and the incorrect syntax that was in the 2011m version of that file
3385 is so fixed - it would have been fixed in a different way had this
3386 change not happened - that's the "missing" sccs version id).
3389 Release data2011m - 2011-10-24 21:42:16 +0700
3391 In particular, the typos in comments in the data (2011-11-17 should have
3392 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
3393 Tim Parenti noted) have been fixed, and the change for Ukraine has been
3394 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
3395 Tim Parenti, and also Denys Gavrysh)
3397 In addition, I added Europe/Tiraspol to zone.tab.
3399 This time, all the files have new version numbers... (including the files
3400 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
3401 version numbers there...)
3404 Release data2011l - 2011-10-10 11:15:43 +0700
3406 There are just 2 changes that cause different generated tzdata files from
3407 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
3408 is included, but commented out. Compared with the diff I sent out last week,
3409 this version also includes attributions for the sources for the changes
3410 (in much the same format as ado used, but the html tags have not been
3411 checked, verified, or used in any way at all, so if there are errors there,
3412 please let me know.)
3415 Release data2011k - 2011-09-20 17:54:03 -0400
3420 Release data2011j - 2011-09-12 09:22:49 -0400
3422 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
3423 Tanzania); there are also two spelling corrections to comments in
3424 the australasia file (with thanks to Christos Zoulas).
3427 Release 2011i - 2011-08-29 05:56:32 -0400
3432 Release data2011h - 2011-06-15 18:41:48 -0400
3434 Russia and Curaçao changes
3437 Release 2011g - 2011-04-25 09:07:22 -0400
3439 update the rules for Egypt to reflect its abandonment of DST this year
3442 Release 2011f - 2011-04-06 17:14:53 -0400
3447 Release 2011e - 2011-03-31 16:04:38 -0400
3449 Morocco, Chile, and tz-link changes
3452 Release 2011d - 2011-03-14 09:18:01 -0400
3454 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
3457 Release 2011c - 2011-03-07 09:30:09 -0500
3459 These do affect current timestamps in Chile and Annette Island, Canada.
3462 Release 2011b - 2011-02-07 08:44:50 -0500
3467 Release 2011a - 2011-01-24 10:30:16 -0500
3472 Release data2010o - 2010-11-01 09:18:23 -0400
3474 change to the end of DST in Fiji in 2011
3477 Release 2010n - 2010-10-25 08:19:17 -0400
3482 Release 2010m - 2010-09-27 09:24:48 -0400
3484 Hong Kong, Vostok, and zic.c changes
3487 Release 2010l - 2010-08-16 06:57:25 -0400
3492 Release 2010k - 2010-07-26 10:42:27 -0400
3497 Release 2010j - 2010-05-10 09:07:48 -0400
3499 changes for Bahía de Banderas and for version naming
3502 Release data2010i - 2010-04-16 18:50:45 -0400
3504 the end of DST in Morocco on 2010-08-08
3507 Release data2010h - 2010-04-05 09:58:56 -0400
3512 Release data2010g - 2010-03-24 11:14:53 -0400
3517 Release 2010f - 2010-03-22 09:45:46 -0400
3522 Release data2010e - 2010-03-08 14:24:27 -0500
3524 corrects the Dhaka bug found by Danvin Ruangchan
3527 Release data2010d - 2010-03-06 07:26:01 -0500
3532 Release 2010c - 2010-03-01 09:20:58 -0500
3534 changes including KRE's suggestion for earlier initialization of
3535 "goahead" and "goback" structure elements
3538 Release code2010a - 2010-02-16 10:40:04 -0500
3543 Release data2010b - 2010-01-20 12:37:01 -0500
3548 Release data2010a - 2010-01-18 08:30:04 -0500
3553 Release data2009u - 2009-12-26 08:32:28 -0500
3555 changes to DST in Bangladesh
3558 Release 2009t - 2009-12-21 13:24:27 -0500
3563 Release data2009s - 2009-11-14 10:26:32 -0500
3565 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3568 Release 2009r - 2009-11-09 10:10:31 -0500
3570 "antarctica" and "tz-link.htm" changes
3573 Release 2009q - 2009-11-02 09:12:40 -0500
3575 with two corrections as reported by Eric Muller and Philip Newton
3578 Release data2009p - 2009-10-23 15:05:27 -0400
3580 Argentina (including San Luis) changes (with the correction from
3584 Release data2009o - 2009-10-14 16:49:38 -0400
3586 Samoa (commentary only), Pakistan, and Bangladesh changes
3589 Release data2009n - 2009-09-22 15:13:38 -0400
3591 added commentary for Argentina and a change to the end of DST in
3595 Release data2009m - 2009-09-03 10:23:43 -0400
3597 Samoa and Palestine changes
3600 Release data2009l - 2009-08-14 09:13:07 -0400
3602 Samoa (comments only) and Egypt
3605 Release 2009k - 2009-07-20 09:46:08 -0400
3610 Release data2009j - 2009-06-15 06:43:59 -0400
3612 Bangladesh change (with a short turnaround since the DST change is
3616 Release 2009i - 2009-06-08 09:21:22 -0400
3618 updating for DST in Bangladesh this year
3621 Release 2009h - 2009-05-26 09:19:14 -0400
3626 Release data2009g - 2009-04-20 16:34:07 -0400
3631 Release data2009f - 2009-04-10 11:00:52 -0400
3633 correct DST in Pakistan
3636 Release 2009e - 2009-04-06 09:08:11 -0400
3641 Release 2009d - 2009-03-23 09:38:12 -0400
3643 Morocco, Tunisia, Argentina, and American Astronomical Society changes
3646 Release data2009c - 2009-03-16 09:47:51 -0400
3648 change to the start of Cuban DST
3651 Release 2009b - 2009-02-09 11:15:22 -0500
3656 Release 2009a - 2009-01-21 10:09:39 -0500
3661 Release data2008i - 2008-10-21 12:10:25 -0400
3663 southamerica and zone.tab files, with Argentina DST rule changes and
3664 United States zone reordering and recommenting
3667 Release 2008h - 2008-10-13 07:33:56 -0400
3672 Release 2008g - 2008-10-06 09:03:18 -0400
3674 Fix a broken HTML anchor and update Brazil's DST transitions;
3675 there's also a slight reordering of information in tz-art.htm.
3678 Release data2008f - 2008-09-09 22:33:26 -0400
3683 Release 2008e - 2008-07-28 14:11:17 -0400
3685 changes by Arthur David Olson and Jesper Nørgaard Welen
3688 Release data2008d - 2008-07-07 09:51:38 -0400
3690 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3693 Release data2008c - 2008-05-19 17:48:03 -0400
3695 Pakistan, Morocco, and Mongolia
3698 Release data2008b - 2008-03-24 08:30:59 -0400
3700 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3704 Release 2008a - 2008-03-08 05:42:16 -0500
3709 Release 2007k - 2007-12-31 10:25:22 -0500
3711 most importantly, changes to the "southamerica" file based on
3712 Argentina's readoption of daylight saving time
3715 Release 2007j - 2007-12-03 09:51:01 -0500
3717 1. eliminate the "P" (parameter) macro;
3719 2. the "noncontroversial" changes circulated on the time zone
3720 mailing list (less the changes to "logwtmp.c");
3722 3. eliminate "too many transition" errors when "min" is used in time
3725 4. changes by Paul Eggert (including updated information for Venezuela).
3728 Release data2007i - 2007-10-30 10:28:11 -0400
3730 changes for Cuba and Syria
3733 Release 2007h - 2007-10-01 10:05:51 -0400
3735 changes by Paul Eggert, as well as an updated link to the ICU
3736 project in tz-link.htm
3739 Release 2007g - 2007-08-20 10:47:59 -0400
3741 changes by Paul Eggert
3743 The "leapseconds" file has been updated to incorporate the most
3744 recent International Earth Rotation and Reference Systems Service
3747 There's an addition to tz-art.htm regarding the television show "Medium".
3750 Release 2007f - 2007-05-07 10:46:46 -0400
3752 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3755 changes to zic.c to allow hour values greater than 24 (along with
3756 Paul's improved time value overflow checking)
3759 Release 2007e - 2007-04-02 10:11:52 -0400
3761 Syria and Honduras changes by Paul Eggert
3763 zic.c variable renaming changes by Arthur David Olson
3766 Release 2007d - 2007-03-20 08:48:30 -0400
3768 changes by Paul Eggert
3770 the elimination of white space at the ends of lines
3773 Release 2007c - 2007-02-26 09:09:37 -0500
3775 changes by Paul Eggert
3778 Release 2007b - 2007-02-12 09:34:20 -0500
3780 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3782 changes to the commentary in "leapseconds" reflecting the IERS
3783 announcement that there is to be no positive leap second at the end
3787 Release 2007a - 2007-01-08 12:28:29 -0500
3789 changes by Paul Eggert
3791 Derick Rethan's Asmara change
3793 Oscar van Vlijmen's Easter Island local mean time change
3795 symbolic link changes
3798 Release 2006p - 2006-11-27 08:54:27 -0500
3800 changes by Paul Eggert
3803 Release 2006o - 2006-11-06 09:18:07 -0500
3805 changes by Paul Eggert
3808 Release 2006n - 2006-10-10 11:32:06 -0400
3810 changes by Paul Eggert
3813 Release 2006m - 2006-10-02 15:32:35 -0400
3815 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3817 (minimalist) changes to zic.8 to clarify "until" information
3820 Release data2006l - 2006-09-18 12:58:11 -0400
3822 Paul's best-effort work on this coming weekend's Egypt time change
3825 Release 2006k - 2006-08-28 12:19:09 -0400
3827 changes by Paul Eggert
3830 Release 2006j - 2006-08-21 09:56:32 -0400
3832 changes by Paul Eggert
3835 Release code2006i - 2006-08-07 12:30:55 -0400
3839 Ken Pizzini's conversion script
3842 Release code2006h - 2006-07-24 09:19:37 -0400
3844 adds public domain notices to four files
3846 includes a fix for transition times being off by a second
3848 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3851 Release 2006g - 2006-05-08 17:18:09 -0400
3853 northamerica changes by Paul Eggert
3856 Release 2006f - 2006-05-01 11:46:00 -0400
3858 a missing version number problem is fixed (with thanks to Bradley
3859 White for catching the problem)
3862 Release 2006d - 2006-04-17 14:33:43 -0400
3864 changes by Paul Eggert
3866 added new items to tz-arts.htm that were found by Paul
3869 Release 2006c - 2006-04-03 10:09:32 -0400
3871 two sets of data changes by Paul Eggert
3873 a fencepost error fix in zic.c
3875 changes to zic.c and the "europe" file to minimize differences
3876 between output produced by the old 32-bit zic and the new 64-bit
3880 Release 2006b - 2006-02-20 10:08:18 -0500
3881 [tz32code2006b + tz64code2006b + tzdata2006b]
3885 All SCCS IDs were bumped to "8.1" for this release.
3888 Release 2006a - 2006-01-30 08:59:31 -0500
3890 changes by Paul Eggert (in particular, Indiana time zone moves)
3892 an addition to the zic manual page to describe how special-case
3893 transitions are handled
3896 Release 2005r - 2005-12-27 09:27:13 -0500
3898 Canadian changes by Paul Eggert
3900 They also add "<pre>" directives to time zone data files and reflect
3901 changes to warning message logic in "zdump.c" (but with calls to
3902 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3905 Release 2005q - 2005-12-13 09:17:09 -0500
3907 Nothing earth-shaking here:
3908 1. Electronic mail addresses have been removed.
3909 2. Casts of the return value of exit have been removed.
3910 3. Casts of the argument of is.* macros have been added.
3911 4. Indentation in one section of zic.c has been fixed.
3912 5. References to dead URLs in the data files have been dealt with.
3915 Release 2005p - 2005-12-05 10:30:53 -0500
3917 "systemv", "tz-link.htm", and "zdump.c" changes
3918 (less the casts of arguments to the is* macros)
3921 Release 2005o - 2005-11-28 10:55:26 -0500
3923 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3925 zdump.c lint fixes by Arthur David Olson
3928 Release 2005n - 2005-10-03 09:44:09 -0400
3930 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3934 Release 2005m - 2005-08-29 12:15:40 -0400
3936 changes by Paul Eggert (with a small tweak to the tz-art change)
3938 a declaration of an unused variable has been removed from zdump.c
3941 Release 2005l - 2005-08-22 12:06:39 -0400
3943 changes by Paul Eggert
3945 overflow/underflow checks by Arthur David Olson, minus changes to
3946 the "Theory" file about the pending addition of 64-bit data (I grow
3947 less confident of the changes being accepted with each passing day,
3948 and the changes no longer increase the data files nine-fold--there's
3949 less than a doubling in size by my local Sun's reckoning)
3952 Release 2005k - 2005-07-14 14:14:24 -0400
3954 The "leapseconds" file has been edited to reflect the recently
3955 announced leap second at the end of 2005.
3957 I've also deleted electronic mail addresses from the files as an
3961 Release 2005j - 2005-06-13 14:34:13 -0400
3963 These reflect changes to limit the length of time zone abbreviations
3964 and the characters used in those abbreviations.
3966 There are also changes to handle POSIX-style "quoted" timezone
3967 environment variables.
3969 The changes were circulated on the time zone mailing list; the only
3970 change since then was the removal of a couple of minimum-length of
3971 abbreviation checks.
3974 Release data2005i - 2005-04-21 15:04:16 -0400
3976 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3979 Release 2005h - 2005-04-04 11:24:47 -0400
3981 changes by Paul Eggert
3983 minor changes to Makefile and zdump.c to produce more useful output
3984 when doing a "make typecheck"
3987 Release 2005g - 2005-03-14 10:11:21 -0500
3989 changes by Paul Eggert (a change to current DST rules in Uruguay and
3990 an update to a link to time zone software)
3993 Release 2005f - 2005-03-01 08:45:32 -0500
3995 data and documentation changes by Paul Eggert
3998 Release 2005e - 2005-02-10 15:59:44 -0500
4003 Release code2005d - 2005-01-31 09:21:47 -0500
4005 make zic complain about links to links if the -v flag is used
4007 have "make public" do more code checking
4009 add an include to "localtime.c" for the benefit of gcc systems
4012 Release 2005c - 2005-01-17 18:36:29 -0500
4014 get better results when mktime runs on a system where time_t is double
4016 changes to the data files (most importantly to Paraguay)
4019 Release 2005b - 2005-01-10 09:19:54 -0500
4021 Get localtime and gmtime working on systems with exotic time_t types.
4023 Update the leap second commentary in the "leapseconds" file.
4026 Release 2005a - 2005-01-01 13:13:44 -0500
4031 Release code2004i - 2004-12-14 13:42:58 -0500
4033 Deal with systems where time_t is unsigned.
4036 Release code2004h - 2004-12-07 11:40:18 -0500
4038 64-bit-time_t changes
4041 Release 2004g - 2004-11-02 09:06:01 -0500
4043 update to Cuba (taking effect this weekend)
4045 other changes by Paul Eggert
4047 correction of the spelling of Oslo
4049 changed versions of difftime.c and private.h
4052 Release code2004f - 2004-10-21 10:25:22 -0400
4054 Cope with wide-ranging tm_year values.
4057 Release 2004e - 2004-10-11 14:47:21 -0400
4059 Brazil/Argentina/Israel changes by Paul Eggert
4061 changes to tz-link.htm by Paul
4063 one small fix to Makefile
4066 Release 2004d - 2004-09-22 08:27:29 -0400
4068 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
4071 Release 2004c - 2004-08-11 12:06:26 -0400
4073 asctime-related changes
4075 (variants of) some of the documentation changes suggested by Paul Eggert
4078 Release 2004b - 2004-07-19 14:33:35 -0400
4080 data changes by Paul Eggert - most importantly, updates for Argentina
4083 Release 2004a - 2004-05-27 12:00:47 -0400
4085 changes by Paul Eggert
4087 Handle DST transitions that occur at the end of a month in some
4088 years but at the start of the following month in other years.
4090 Add a copy of the correspondence that's the basis for claims about
4091 DST in the Navajo Nation.
4094 Release 2003e - 2003-12-15 09:36:47 -0500
4096 changes by Arthur David Olson (primarily code changes)
4098 changes by Paul Eggert (primarily data changes)
4100 minor changes to "Makefile" and "northamerica" (in the latter case,
4101 optimization of the "Toronto" rules)
4104 Release 2003d - 2003-10-06 09:34:44 -0400
4106 changes by Paul Eggert
4109 Release 2003c - 2003-09-16 10:47:05 -0400
4111 Fix bad returns in zic.c's inleap function.
4112 Thanks to Bradley White for catching the problem!
4115 Release 2003b - 2003-09-16 07:13:44 -0400
4117 Add a "--version" option (and documentation) to the zic and zdump commands.
4119 changes to overflow/underflow checking in zic
4121 a localtime typo fix.
4123 Update the leapseconds and tz-art.htm files.
4126 Release 2003a - 2003-03-24 09:30:54 -0500
4128 changes by Paul Eggert
4130 a few additions and modifications to the tz-art.htm file
4133 Release 2002d - 2002-10-15 13:12:42 -0400
4135 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
4137 There's also a new time zone quote in "tz-art.htm".
4140 Release 2002c - 2002-04-04 11:55:20 -0500
4142 changes by Paul Eggert
4144 Change zic.c to avoid creating symlinks to files that don't exist.
4147 Release 2002b - 2002-01-28 12:56:03 -0500
4149 [These change notes are for Release 2002a, which was corrupted.
4150 2002b was a corrected version of 2002a.]
4152 changes by Paul Eggert
4154 Update the "leapseconds" file to note that there'll be no leap
4155 second at the end of June, 2002.
4157 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
4159 Change to "difftime.c" to avoid sizeof problems.
4162 Release 2001d - 2001-10-09 13:31:32 -0400
4164 changes by Paul Eggert
4167 Release 2001c - 2001-06-05 13:59:55 -0400
4169 changes by Paul Eggert and Andrew Brown
4172 Release 2001b - 2001-04-05 16:44:38 -0400
4174 changes by Paul Eggert (modulo jnorgard's typo fix)
4176 tz-art.htm has been HTMLified.
4179 Release 2001a - 2001-03-13 12:57:44 -0500
4181 changes by Paul Eggert
4183 An addition to the "leapseconds" file: comments with the text of the
4184 latest IERS leap second notice.
4186 Trailing white space has been removed from data file lines, and
4187 repeated spaces in "Rule Jordan" lines in the "asia" file have been
4191 Release 2000h - 2000-12-14 15:33:38 -0500
4193 changes by Paul Eggert
4195 one typo fix in the "art" file
4197 With providence, this is the last update of the millennium.
4200 Release 2000g - 2000-10-10 11:35:22 -0400
4202 changes by Paul Eggert
4204 correction of John Mackin's name submitted by Robert Elz
4206 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
4207 Emmy Awards broadcast.
4210 Release 2000f - 2000-08-10 09:31:58 -0400
4212 changes by Paul Eggert
4214 Added information in "tz-art.htm" on a Seinfeld reference to DST.
4216 Error checking and messages in the "yearistype" script have been
4220 Release 2000e - 2000-07-31 09:27:54 -0400
4222 data changes by Paul Eggert
4224 a change to the default value of the defined constant HAVE_STRERROR
4226 the addition of a Dave Barry quote on DST to the tz-arts file
4229 Release 2000d - 2000-04-20 15:43:04 -0400
4231 changes to the documentation and code of strftime for C99 conformance
4233 a bug fix for date.c
4235 These are based on (though modified from) changes by Paul Eggert.
4238 Release 2000c - 2000-03-04 10:31:43 -0500
4240 changes by Paul Eggert
4243 Release 2000b - 2000-02-21 12:16:29 -0500
4245 changes by Paul Eggert and Joseph Myers
4247 modest tweaks to the tz-art.htm and tz-link.htm files
4250 Release 2000a - 2000-01-18 09:21:26 -0500
4252 changes by Paul Eggert
4254 The two hypertext documents have also been renamed.
4257 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
4259 Paul Eggert's changes
4261 additions to the "zic" manual page and the "Arts.htm" file
4264 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
4269 Release data1999h - 1999-10-07 03:50:29 -0400
4271 changes by Paul Eggert to "europe" (most importantly, fixing
4272 Lithuania and Estonia)
4275 Release 1999g - 1999-09-28 11:06:18 -0400
4277 data changes by Paul Eggert (most importantly, the change for
4278 Lebanon that buys correctness for this coming Sunday)
4280 The "code" file contains changes to "Makefile" and "checktab.awk" to
4281 allow better checking of time zone files before they are published.
4284 Release 1999f - 1999-09-23 09:48:14 -0400
4286 changes by Arthur David Olson and Paul Eggert
4289 Release 1999e - 1999-08-17 15:20:54 -0400
4291 changes circulated by Paul Eggert, although the change to handling
4292 of DST-specifying timezone names has been commented out for now
4293 (search for "XXX" in "localtime.c" for details). These files also
4294 do not make any changes to the start of DST in Brazil.
4296 In addition to Paul's changes, there are updates to "Arts.htm" and
4300 Release 1999d - 1999-03-30 11:31:07 -0500
4302 changes by Paul Eggert
4304 The Makefile's "make public" rule has also been changed to do a test
4305 compile of each individual time zone data file (which should help
4306 avoid problems such as the one we had with Nicosia).
4309 Release 1999c - 1999-03-25 09:47:47 -0500
4311 changes by Paul Eggert, most importantly the change for Chile.
4314 Release 1999b - 1999-02-01 17:51:44 -0500
4316 changes by Paul Eggert
4318 code changes (suggested by Mani Varadarajan, mani at be.com) for
4319 correct handling of symbolic links when building using a relative directory
4321 code changes to generate correct messages for failed links
4323 updates to the URLs in Arts.htm
4326 Release 1999a - 1999-01-19 16:20:29 -0500
4328 error message internationalizations and corrections in zic.c and
4329 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
4333 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
4335 changes for Brazil, Chile, and Germany
4337 support for use of "24:00" in the input files for the time zone compiler
4340 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
4342 changes by Paul Eggert
4344 correction to a define in the "private.h" file
4347 Release data1998g - 1998-08-11 03:28:35 -0000
4348 [tzdata1998g.tar.gz is missing!]
4350 Lithuanian change provided by mgedmin at pub.osf.it
4352 Move creation of the GMT link with Etc/GMT to "etcetera" (from
4353 "backward") to ensure that the GMT file is created even where folks
4354 don't want the "backward" links (as suggested by Paul Eggert).
4357 Release data1998f - 1998-07-20 13:50:00 -0000
4358 [tzdata1998f.tar.gz is missing!]
4360 Update the "leapseconds" file to include the newly-announced
4361 insertion at the end of 1998.
4364 Release code1998f - 1998-06-01 10:18:31 -0400
4366 addition to localtime.c by Guy Harris
4369 Release 1998e - 1998-05-28 09:56:26 -0400
4371 The Makefile is changed to produce zoneinfo-posix rather than
4372 zoneinfo/posix, and to produce zoneinfo-leaps rather than
4375 data changes by Paul Eggert
4377 changes from Guy Harris to provide asctime_r and ctime_r
4379 A usno1998 file (substantially identical to usno1997) has been added.
4382 Release 1998d - 1998-05-14 11:58:34 -0400
4384 changes to comments (in particular, elimination of references to CIA maps).
4385 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
4386 where changes occur.
4389 Release 1998c - 1998-02-28 12:32:26 -0500
4391 changes by Paul Eggert (save the "French correction," on which I'll
4392 wait for the dust to settle)
4396 changes and additions to Arts.htm
4399 Release 1998b - 1998-01-17 14:31:51 -0500
4401 URL cleanups and additions
4404 Release 1998a - 1998-01-13 12:37:35 -0500
4406 changes by Paul Eggert
4409 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
4411 changes by Paul Eggert, with minor modifications from Arthur David
4412 Olson to make the files more browser friendly
4415 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
4417 minor changes to put "TZif" at the start of each timezone information file
4419 a rule has also been added to the Makefile so you can
4421 to just recompile the zone information files (rather than doing a
4422 full "make install" with its other effects).
4425 Release data1997i - 1997-10-07 08:45:38 -0400
4427 changes to Africa by Paul Eggert
4430 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
4432 corrections for Uruguay (and other locations)
4434 Arthur David Olson's simple-minded fix allowing mktime to both
4435 correctly handle leap seconds and correctly handle tm_sec values
4436 upon which arithmetic has been performed.
4439 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
4441 Paul Eggert's updates
4443 a small change to a function prototype;
4445 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
4446 include information on Around the World in Eighty Days.
4449 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
4451 fixes to zic's error handling
4453 changes inspired by the item circulated on Slovenia
4455 The description of Web resources has been HTMLified for browsing
4458 A new piece of tz-related music has been added to the "Music" file.
4461 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
4463 Paul Eggert's latest suggestions
4466 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
4468 changes to "zic.c" to correct performance of the "-s" option
4470 a new file "usno1997"
4473 Release data1997c - 1997-03-04 09:58:18 -0500
4478 Release 1997b - 1997-02-27 18:34:19 -0500
4480 The data file incorporates the 1997 leap second.
4482 The code file incorporates Arthur David Olson's take on the
4483 zic/multiprocessor/directory-creation situation.
4486 Release 1997a - 1997-01-21 09:11:10 -0500
4488 Paul Eggert's Antarctica (and other changes)
4490 Arthur David Olson finessed the "getopt" issue by checking against
4491 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4492 is returned while SunOS 5.5's manual says EOF is returned).
4495 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4497 Paul Eggert's latest changes
4500 Release code1996n - 1996-12-16 09:42:02 -0500
4502 link snapping fix from Bruce Evans (via Garrett Wollman)
4505 Release data1996m - 1996-11-24 02:37:34 -0000
4506 [tzdata1996m.tar.gz is missing!]
4508 Paul Eggert's batch of changes
4511 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4513 No functional changes here; the files have simply been changed to
4514 make more use of ISO style dates in comments. The names of the above
4515 files now include the year in full.
4518 Release code96l - 1996-09-08 17:12:20 -0400
4520 tzcode96k was missing a couple of pieces.
4523 Release 96k - 1996-09-08 16:06:22 -0400
4525 the latest round of changes from Paul Eggert
4527 the recent Year 2000 material
4530 Release code96j - 1996-07-30 13:18:53 -0400
4532 Set sp->typecnt as suggested by Timothy Patrick Murphy.
4535 Release code96i - 1996-07-27 20:11:35 -0400
4537 Paul's suggested patch for strftime %V week numbers
4540 Release data96i - 1996-07-01 18:13:04 -0400
4542 "northamerica" and "europe" changes by Paul Eggert
4545 Release code96h - 1996-06-05 08:02:21 -0400
4547 fix for handling transitions specified in Universal Time
4549 Some "public domain" notices have also been added.
4552 Release code96g - 1996-05-16 14:00:26 -0400
4554 fix for the simultaneous-DST-and-zone-change challenge
4557 Release data96h - 1996-05-09 17:40:51 -0400
4559 changes by Paul Eggert
4562 Release code96f-data96g - 1996-05-03 03:09:59 -0000
4563 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4565 The changes get us some of the way to fixing the problems noted in Paul
4566 Eggert's letter yesterday (in addition to a few others). The approach
4567 has been to make zic a bit smarter about figuring out what time zone
4568 abbreviations apply just after the time specified in the "UNTIL" part
4569 of a zone line. Putting the smarts in zic means avoiding having
4570 transition times show up in both "Zone" lines and "Rule" lines, which
4571 in turn avoids multiple transition time entries in time zone files.
4572 (This also makes the zic input files such as "europe" a bit shorter and
4573 should ease maintenance.)
4576 Release data96f - 1996-04-19 19:20:03 -0000
4577 [tzdata96f.tar.gz is missing!]
4579 The only changes are to the "northamerica" file; the time zone
4580 abbreviation for Denver is corrected to MST (and MDT), and the
4581 comments for Mexico have been updated.
4584 Release data96e - 1996-03-19 17:37:26 -0500
4586 Proposals by Paul Eggert, in particular the Portugal change that
4587 comes into play at the end of this month.
4590 Release data96d - 1996-03-18 20:49:39 -0500
4595 Release code96e - 1996-02-29 15:43:27 -0000
4596 [tzcode96e.tar.gz is missing!]
4598 internationalization changes and the fix to the documentation for strftime
4601 Release code96d-data96c - 1996-02-12 11:05:27 -0500
4603 The "code" file simply updates Bob Kridle's electronic address.
4605 The "data" file updates rules for Mexico.
4608 Release data96b - 1996-01-27 15:44:42 -0500
4613 Release code96c - 1996-01-16 16:58:15 -0500
4615 leap-year streamlining and binary-search changes
4620 Release code96b - 1996-01-10 20:42:39 -0500
4622 fixes and enhancements from Paul Eggert, including code that
4623 emulates the behavior of recent versions of the SunOS "date"
4627 Release 96a - 1996-01-06 09:08:24 -0500
4631 fixes to strftime.c for correct ISO 8601 week number generation,
4632 plus support for two new formats ('G' and 'g') to give ISO 8601 year
4633 numbers (which are not necessarily the same as calendar year numbers)
4636 Release code95i-data95m - 1995-12-21 12:46:47 -0500
4638 The latest revisions from Paul Eggert are included, the usno1995
4639 file has been updated, and a new file ("WWW") covering useful URLs
4643 Release code95h-data95l - 1995-12-19 18:10:12 -0500
4645 A simplification of a macro definition, a change to data for Sudan,
4646 and (for last minute shoppers) notes in the "Music" file on the CD
4650 Release code95g-data95k - 1995-10-30 10:32:47 -0500
4652 (slightly reformatted) 8-bit-clean proposed patch
4654 minor patch: US/Eastern -> America/New_York
4656 snapshot of the USNO's latest data ("usno1995")
4658 some other minor cleanups
4661 Release code95f-data95j - 1995-10-28 21:01:34 -0000
4662 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4666 support for 64-bit time_t's
4668 optimization in localtime.c
4671 Release code95e - 1995-10-13 13:23:57 -0400
4673 the mktime change to scan from future to past when trying to find time zone
4677 Release data95i - 1995-09-26 10:43:26 -0400
4679 For Canada/Central, guess that the Sun customer's "one week too
4680 early" was just a approximation, and the true error is one month
4681 too early. This is consistent with the rest of Canada.
4684 Release data95h - 1995-09-21 11:26:48 -0400
4686 latest changes from Paul Eggert
4689 Release code95d - 1995-09-14 11:14:45 -0400
4691 the addition of a "Music" file, which documents four recorded
4692 versions of the tune "Save That Time".
4695 Release data95g - 1995-09-01 17:21:36 -0400
4697 "yearistype" correction
4700 Release data95f - 1995-08-28 20:46:56 -0400
4702 Paul Eggert's change to the australasia file
4705 Release data95e - 1995-07-08 18:02:34 -0400
4707 The only change is a leap second at the end of this year.
4708 Thanks to Bradley White for forwarding news on the leap second.
4711 Release data95d - 1995-07-03 13:26:22 -0400
4713 Paul Eggert's changes
4716 Release data95c - 1995-07-02 19:19:28 -0400
4718 changes to "asia", "backward", "europe", and "southamerica"
4719 (read: northamericacentrics need not apply)
4722 Release code95c - 1995-03-13 14:00:46 -0500
4724 one-line fix for sign extension problems in detzcode
4727 Release 95b - 1995-03-04 11:22:38 -0500
4729 Minor changes in both:
4731 The "code" file contains a workaround for the lack of "unistd.h" in
4732 Microsoft C++ version 7.
4734 The "data" file contains a fixed "Link" for America/Shiprock.
4737 Release 94h - 1994-12-10 12:51:14 -0500
4741 * incorporate the changes to "zdump" and "date" to make changes to
4742 the "TZ" environment variable permanent;
4744 * incorporate the table changes by Paul Eggert;
4746 * include (and document) support for universal time specifications in
4747 data files - but do not (yet) include use of this feature in the
4750 Think of this as "TZ Classic" - the software has been set up not to break if
4751 universal time shows up in its input, and data entries have been
4752 left as is so as not to break existing implementations.
4755 Release data94f - 1994-08-20 12:56:09 -0400
4757 (with thanks!) the latest data updates from Paul Eggert
4760 Release data94e - 1994-06-04 13:13:53 -0400
4765 Release code94g - 1994-05-05 12:14:07 -0400
4767 fix missing "optind.c" and a reference to it in the Makefile
4770 Release code94f - 1994-05-05 13:00:33 -0000
4771 [tzcode94f.tar.gz is missing!]
4773 changes to avoid overflow in difftime, as well as changes to cope
4774 with the 52/53 challenge in strftime
4777 Release code94e - 1994-03-30 23:32:59 -0500
4779 change for the benefit of PCTS
4782 Release 94d - 1994-02-24 15:42:25 -0500
4784 Avoid clashes with POSIX semantics for zones such as GMT+4.
4786 Some other very minor housekeeping is also present.
4789 Release code94c - 1994-02-10 08:52:40 -0500
4791 Fix bug where mkdirs was broken unless you compile with
4792 -fwritable-strings (which is generally losing to do).
4795 Release 94b - 1994-02-07 10:04:33 -0500
4797 work by Paul Eggert who notes:
4799 I found another book of time zone histories by E W Whitman; it's not
4800 as extensive as Shanks but has a few goodies of its own. I used it
4801 to update the tables. I also fixed some more as a result of
4802 correspondence with Adam David and Peter Ilieve, and move some stray
4803 links from 'europe' to 'backward'. I corrected some scanning errors
4806 As far as the code goes, I fixed zic to allow years in the range
4807 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4808 And I cleaned up the zic documentation a little bit.
4811 Release data94a - 1994-02-03 08:58:54 -0500
4813 It simply incorporates the recently announced leap second into the
4817 Release 93g - 1993-11-22 17:28:27 -0500
4819 Paul Eggert has provided a good deal of historic information (based
4820 on Shanks), and there are some code changes to deal with the buglets
4821 that crawled out in dealing with the new information.
4824 Release 93f - 1993-10-15 12:27:46 -0400
4826 Paul Eggert's changes
4829 Release 93e - 1993-09-05 21:21:44 -0400
4831 This has updated data for Israel, England, and Kwajalein. There's
4832 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4833 Thanks to Paul Eggert and Peter Ilieve for the changes.
4836 Release 93d - 1993-06-17 23:34:17 -0400
4838 new fix and new data on Israel
4841 Release 93c - 1993-06-06 19:31:55 -0400
4846 Release 93b - 1993-02-02 14:53:58 -0500
4848 updated "leapseconds" file
4851 Release 93 - 1993-01-08 07:01:06 -0500
4853 At kre's suggestion, the package has been split in two - a code piece
4854 (which also includes documentation) that's only of use to folks who
4855 want to recompile things and a data piece useful to anyone who can
4858 The new version has a few changes to the data files, a few
4859 portability changes, and an off-by-one fix (with thanks to
4860 Tom Karzes at deshaw.com for providing a description and a
4864 Release 92c - 1992-11-21 17:35:36 -0000
4865 [tz92c.tar.Z is missing!]
4867 The fallout from the latest round of DST transitions.
4869 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4870 there's also a change to "zic.c" that makes it portable to more systems.
4873 Release 92 - 1992-04-25 18:17:03 -0000
4874 [tz92.tar.Z is missing!]
4876 By popular demand (well, at any rate, following a request by kre at munnari)
4879 The 1989 update of the time zone package featured:
4881 * POSIXization (including interpretation of POSIX-style TZ environment
4882 variables, provided by Guy Harris),
4883 * ANSIfication (including versions of "mktime" and "difftime"),
4884 * SVIDulation (an "altzone" variable)
4885 * MACHination (the "gtime" function)
4886 * corrections to some time zone data (including corrections to the rules
4887 for Great Britain and New Zealand)
4888 * reference data from the United States Naval Observatory for folks who
4889 want to do additional time zones
4890 * and the 1989 data for Saudi Arabia.
4892 (Since this code will be treated as "part of the implementation" in some
4893 places and as "part of the application" in others, there's no good way to
4894 name functions, such as timegm, that are not part of the proposed ANSI C
4895 standard; such functions have kept their old, underscore-free names in this
4898 And the "dysize" function has disappeared; it was present to allow
4899 compilation of the "date" command on old BSD systems, and a version of "date"
4900 is now provided in the package. The "date" command is not created when you
4901 "make all" since it may lack options provided by the version distributed with
4902 your operating system, or may not interact with the system in the same way
4903 the native version does.
4905 Since POSIX frowns on correct leap second handling, the default behavior of
4906 the "zic" command (in the absence of a "-L" option) has been changed to omit
4907 leap second information from its output files.
4913 This file contains copies of the part of each release announcement
4914 that talks about the changes in that release. The text has been
4915 adapted and reformatted for the purposes of this file.
4917 Traditionally a release R consists of a pair of tarball files,
4918 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4919 code2010a, data2012c) consist of just one or the other tarball, and a
4920 few (e.g., code2012c-data2012d) have tarballs with mixed version
4921 numbers. Recent releases also come in an experimental format
4922 consisting of a single tarball tzdb-R.tar.lz with extra data.
4924 Release timestamps are taken from the release's commit (for newer,
4925 Git-based releases), from the newest file in the tarball (for older
4926 releases, where this info is available) or from the email announcing
4927 the release (if all else fails; these are marked with a time zone
4928 abbreviation of -0000 and an "is missing!" comment).
4930 Earlier versions of the code and data were not announced on the tz
4931 list and are not summarized here.
4933 This file is in the public domain.