1 News for the tz database
3 Release 20198 - 2019-03-25 22:01:33 -0700
6 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23.
7 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00.
9 Changes to past and future timestamps
11 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
12 previously predicted. Adjust our prediction by guessing that spring
13 transitions will be between 24 and 30 March, which matches recent practice
14 since 2016. (Thanks to Even Scharning and Tim Parenti.)
16 Metlakatla ended its observance of Pacific standard time,
17 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan
18 Stanley and Tim Parenti.)
20 Changes to past timestamps
22 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25).
23 (Thanks to Alois Treindl and Isaac Starkman.)
25 Changes to time zone abbreviations
27 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead
28 of being a separate zone that generates the abbreviation "UCT",
29 which nowadays is typically a typo. (Problem reported by Isiah
34 zic now has an -r option to limit the time range of output data.
35 For example, 'zic -r @1000000000' limits the output data to
36 timestamps starting 1000000000 seconds after the Epoch.
37 This helps shrink output size and can be useful for applications
38 not needing the full timestamp history, such as TZDIST truncation;
39 see Internet RFC 8536 section 5.1. (Inspired by a feature request
40 from Christopher Wong, helped along by bug reports from Wong and
43 Changes to documentation
45 Mention Internet RFC 8536 (February 2019), which documents TZif.
47 tz-link.html now cites tzdata-meta
48 <https://tzdata-meta.timtimeonline.com/>.
51 Release 2018i - 2018-12-30 11:05:43 -0800
54 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
56 Changes to future timestamps
58 Due to a change in government, São Tomé and Príncipe switches back
59 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim
60 Nasardinov and Michael Deckers.)
63 Release 2018h - 2018-12-23 17:59:32 -0800
66 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
67 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
68 Metlakatla, Alaska observes PST this winter only.
69 Guess Morocco will continue to adjust clocks around Ramadan.
70 Add predictions for Iran from 2038 through 2090.
72 Changes to future timestamps
74 Guess that Morocco will continue to fall back just before and
75 spring forward just after Ramadan, the practice since 2012.
76 (Thanks to Maamar Abdelkader.) This means Morocco will observe
77 negative DST during Ramadan in main and vanguard formats, and in
78 rearguard format it stays in the +00 timezone and observes
79 ordinary DST in all months other than Ramadan. As before, extend
80 this guesswork to the year 2037. As a consequence, Morocco is
81 scheduled to observe three DST transitions in some Gregorian years
82 (e.g., 2033) due to the mismatch between the Gregorian and Islamic
85 The table of exact transitions for Iranian DST has been extended.
86 It formerly cut off before the year 2038 in a nod to 32-bit time_t.
87 It now cuts off before 2091 as there is doubt about how the Persian
88 calendar will treat 2091. This change predicts DST transitions in
89 2038-9, 2042-3, and 2046-7 to occur one day later than previously
90 predicted. As before, post-cutoff transitions are approximated.
92 Changes to past and future timestamps
94 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to
95 +05 on 2018-12-21. This is a zone split as Qostanay (aka
96 Kostanay) did not switch, so create a zone Asia/Qostanay.
98 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04.
99 It did not change clocks that day and remains on -08 this winter.
100 (Thanks to Ryan Stanley.) It will revert to the usual Alaska
101 rules next spring, so this change affects only timestamps
102 from 2018-11-04 through 2019-03-10.
104 Change to past timestamps
106 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00,
107 not 00:00. I transcribed the time incorrectly from Shanks.
108 (Thanks to Phake Nick.)
110 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00.
111 (Thanks to Phake Nick.)
113 Guam observed DST irregularly from 1959 through 1977.
114 (Thanks to Phake Nick.)
116 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on
117 10-01 changed standard time to +08:30 (not +08). Its transition
118 back to +08 after WWII was on 1945-09-15, not the previous day.
119 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT).
120 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also,
121 its 1952 fallback was on 11-02 (not 10-25).
123 This release contains many changes to timestamps before 1946 due
124 to Japanese possession or occupation of Pacific/Chuuk,
125 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro,
126 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei.
127 (Thanks to Phake Nick.)
129 Assume that the Spanish East Indies was like the Philippines and
130 observed American time until the end of 1844. This affects
131 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei.
133 Changes to past tm_isdst flags
135 For the recent Morocco change, the tm_isdst flag should be 1 from
136 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.)
137 Give a URL to the official decree. (Thanks to Matt Johnson.)
140 Release 2018g - 2018-10-26 22:22:45 -0700
143 Morocco switches to permanent +01 on 2018-10-28.
145 Changes to future timestamps
147 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28,
148 so its clocks will not fall back as previously scheduled.
149 (Thanks to Mohamed Essedik Najd and Brian Inglis.)
153 When generating TZif files with leap seconds, zic no longer uses a
154 format that trips up older 32-bit clients, fixing a bug introduced
155 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround
156 for QTBUG-53071 now also works for TZif files with leap seconds.
158 The translator to rearguard format now rewrites the line
159 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
160 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S".
161 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
162 and earlier. (Reported by Christos Zoulas.)
164 Changes to past time zone abbreviations
166 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
167 This reverts to 2011h, as the abbreviation change in 2011i was
170 Changes to documentation
172 tzfile.5 has new sections on interoperability issues.
175 Release 2018f - 2018-10-18 00:14:18 -0700
178 Volgograd moves from +03 to +04 on 2018-10-28.
179 Fiji ends DST 2019-01-13, not 2019-01-20.
180 Most of Chile changes DST dates, effective 2019-04-06.
182 Changes to future timestamps
184 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
185 (Thanks to Alexander Fetisov and Stepan Golosunov.)
187 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
188 predicted. (Thanks to Raymond Kumar.) Adjust future predictions
191 Most of Chile will end DST on the first Saturday in April at 24:00 mainland
192 time, and resume DST on the first Saturday in September at 24:00 mainland
193 time. The changes are effective from 2019-04-06, and do not affect the
194 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa
195 and Tim Parenti.) Adjust future predictions accordingly.
197 Changes to past timestamps
199 The 2018-05-05 North Korea 30-minute time zone change took place
200 at 23:30 the previous day, not at 00:00 that day.
202 China's 1988 spring-forward transition was on April 17, not
203 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00.
206 Fix several issues for Macau before 1992. Macau's pre-1904 LMT
207 was off by 10 s. Macau switched to +08 in 1904 not 1912, and
208 temporarily switched to +09/+10 during World War II. Macau
209 observed DST in 1942/79, not 1961/80, and there were several
210 errors for transition times and dates. (Thanks to P Chan.)
212 The 1948-1951 fallback transitions in Japan were at 25:00 on
213 September's second Saturday, not at 24:00. (Thanks to Phake Nick.)
214 zic turns this into 01:00 on the day after September's second
215 Saturday, which is the best that POSIX or C platforms can do.
217 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
218 paper by Li Yu, replacing more-questionable data from Shanks.
220 Changes to time zone abbreviations
222 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.)
226 zic now always generates TZif files where time type 0 is used for
227 timestamps before the first transition. This simplifies the
228 reading of TZif files and should not affect behavior of existing
229 TZif readers because the same set of time types is used; only
230 their internal indexes may have changed. This affects only the
231 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
232 EET, which previously used nonzero types for these timestamps.
234 Because of the type 0 change, zic no longer outputs a dummy
235 transition at time -2**59 (before the Big Bang), as clients should
236 no longer need this to handle historical timestamps correctly.
237 This reverts a change introduced in 2013d and shrinks most TZif
238 files by a few bytes.
240 zic now supports negative time-of-day in Rule and Leap lines, e.g.,
241 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
242 occurs at 18:00 on the Saturday before the last Sunday in April.
243 This behavior was documented in 2018a but the code did not
244 entirely match the documentation.
246 localtime.c no longer requires at least one time type in TZif
247 files that lack transitions or have a POSIX-style TZ string. This
248 future-proofs the code against possible future extensions to the
249 format that would allow TZif files with POSIX-style TZ strings and
250 without transitions or time types.
252 A read-access subscript error in localtime.c has been fixed.
253 It could occur only in TZif files with timecnt == 0, something that
254 does not happen in practice now but could happen in future versions.
256 localtime.c no longer ignores TZif POSIX-style TZ strings that
257 specify only standard time. Instead, these TZ strings now
258 override the default time type for timestamps after the last
259 transition (or for all timestamps if there are no transitions),
260 just as DST strings specifying DST have always done.
262 leapseconds.awk now outputs "#updated" and "#expires" comments,
263 and supports leap seconds at the ends of months other than June
264 and December. (Inspired by suggestions from Chris Woodbury.)
266 Changes to documentation
268 New restrictions: A Rule name must start with a character that
269 is neither an ASCII digit nor "-" nor "+", and an unquoted name
270 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
271 The latter restriction makes room for future extensions (a
272 possibility noted by Tom Lane).
274 tzfile.5 now documents what time types apply before the first and
275 after the last transition, if any.
277 Documentation now uses the spelling "timezone" for a TZ setting
278 that determines timestamp history, and "time zone" for a
279 geographic region currently sharing the same standard time.
281 The name "TZif" is now used for the tz binary data format.
283 tz-link.htm now mentions the A0 TimeZone Migration utilities.
284 (Thanks to Aldrin Martoq for the link.)
286 Changes to build procedure
288 New 'make' target 'rearguard_tarballs' to build the rearguard
289 tarball only. This is a convenience on platforms that lack lzip
290 if you want to build the rearguard tarball. (Problem reported by
293 tzdata.zi is now more stable from release to release. (Problem
294 noted by Tom Lane.) It is also a bit shorter.
296 tzdata.zi now can contain comment lines documenting configuration
297 information, such as which data format was selected, which input
298 files were used, and how leap seconds are treated. (Problems
299 noted by Lester Caine and Brian Inglis.) If the Makefile defaults
300 are used these comment lines are absent, for backward
301 compatibility. A redistributor intending to alter its copy of the
302 files should also append "-LABEL" to the 'version' file's first
303 line, where "LABEL" identifies the redistributor's change.
306 Release 2018e - 2018-05-01 23:42:51 -0700
310 North Korea switches back to +09 on 2018-05-05.
311 The main format uses negative DST again, for Ireland etc.
312 'make tarballs' now also builds a rearguard tarball.
313 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
315 Changes to past and future timestamps
317 North Korea switches back from +0830 to +09 on 2018-05-05.
318 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
321 Bring back the negative-DST changes of 2018a, except be more
322 compatible with data parsers that do not support negative DST.
323 Also, this now affects historical timestamps in Namibia and the
324 former Czechoslovakia, not just Ireland. The main format now uses
325 negative DST to model timestamps in Europe/Dublin (from 1971 on),
326 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
327 does not affect UT offsets, only time zone abbreviations and the
328 tm_isdst flag. Also, this does not affect rearguard or vanguard
329 formats; effectively the main format now uses vanguard instead of
330 rearguard format. Data parsers that do not support negative DST
331 can still use data from the rearguard tarball described below.
333 Changes to build procedure
335 The command 'make tarballs' now also builds the tarball
336 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
337 except that it uses rearguard format intended for trailing-edge
340 Changes to data format and to code
342 The SAVE column of Rule and Zone lines can now have an 's' or 'd'
343 suffix, which specifies whether the adjusted time is standard time
344 or daylight saving time. If no suffix is given, daylight saving
345 time is used if and only if the SAVE column is nonzero; this is
346 the longstanding behavior. Although this new feature is not used
347 in tzdata, it could be used to specify the legal time in Namibia
348 1994-2017, as opposed to the popular time (see below).
350 Changes to past timestamps
352 From 1994 through 2017 Namibia observed DST in winter, not summer.
353 That is, it used negative DST, as Ireland still does. This change
354 does not affect UTC offsets; it affects only the tm_isdst flag and
355 the abbreviation used during summer, which is now CAT, not WAST.
356 Although (as noted by Michael Deckers) summer and winter time were
357 both simply called "standard time" in Namibian law, in common
358 practice winter time was considered to be DST (as noted by Stephen
359 Colebourne). The full effect of this change is only in vanguard
360 and main format; in rearguard format, the tm_isdst flag is still
361 zero in winter and nonzero in summer.
363 In 1946/7 Czechoslovakia also observed negative DST in winter.
364 The full effect of this change is only in vanguard and main
365 formats; in rearguard format, it is modeled as plain GMT without
366 daylight saving. Also, the dates of some 1944/5 DST transitions
367 in Czechoslovakia have been changed.
370 Release 2018d - 2018-03-22 07:05:46 -0700
374 Palestine starts DST a week earlier in 2018.
375 Add support for vanguard and rearguard data consumers.
376 Add subsecond precision to source data format, though not to data.
378 Changes to future timestamps
380 In 2018, Palestine starts DST on March 24, not March 31.
381 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
383 Changes to past and future timestamps
385 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
386 at 04:00. (Thanks to Steffen Thorsen.)
388 Changes to past timestamps
390 Historical transitions for Uruguay, represented by
391 America/Montevideo, have been updated per official legal documents,
392 replacing previous data mainly originating from the inventions of
393 Shanks & Pottenger. This has resulted in adjustments ranging from
394 30 to 90 minutes in either direction over at least two dozen
395 distinct periods ranging from one day to several years in length.
396 A mere handful of pre-1991 transitions are unaffected; data since
397 then has come from more reliable contemporaneous reporting. These
398 changes affect various timestamps in 1920-1923, 1936, 1939,
399 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
400 Additionally, Uruguay's pre-standard-time UT offset has been
401 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
402 match the location of the Observatory of the National Meteorological
403 Institute in Montevideo.
404 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
406 Enderbury and Kiritimati skipped New Year's Eve 1994, not
407 New Year's Day 1995. (Thanks to Kerry Shetline.)
409 Fix the 1912-01-01 transition for Portugal and its colonies.
410 This transition was at 00:00 according to the new UT offset, not
411 according to the old one. Also assume that Cape Verde switched on
412 the same date as the rest, not in 1907. This affects
413 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
414 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
415 (Thanks to Michael Deckers.)
417 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
420 Changes to past time zone abbreviations
422 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There
423 is no clock change associated with the transition.
425 Changes to build procedure
427 The new DATAFORM macro in the Makefile lets the installer choose
428 among three source data formats. The idea is to lessen downstream
429 disruption when data formats are improved.
431 * DATAFORM=vanguard installs from the latest, bleeding-edge
432 format. DATAFORM=main (the default) installs from the format
433 used in the 'africa' etc. files. DATAFORM=rearguard installs
434 from a trailing-edge format. Eventually, elements of today's
435 vanguard format should move to the main format, and similarly
436 the main format's features should eventually move to the
439 * In the current version, the main and rearguard formats are
440 identical and match that of 2018c, so this change does not
441 affect default behavior. The vanguard format currently contains
442 one feature not in the main format: negative SAVE values. This
443 improves support for Ireland, which uses Irish Standard Time
444 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has
445 supported negative SAVE values for decades, and this feature
446 should move to the main format soon. However, it will not move
447 to the rearguard format for quite some time because some
448 downstream parsers do not support it.
450 * The build procedure constructs three files vanguard.zi, main.zi,
451 and rearguard.zi, one for each format. Although the files
452 represent essentially the same data, they may have minor
453 discrepancies that users are not likely to notice. The files
454 are intended for downstream data consumers and are not
455 installed. Zoneinfo parsers that do not support negative SAVE values
456 should start using rearguard.zi, so that they will be unaffected
457 when the negative-DST feature moves from vanguard to main.
458 Bleeding-edge Zoneinfo parsers that support the new features
459 already can use vanguard.zi; in this respect, current tzcode is
462 The Makefile should now be safe for parallelized builds, and 'make
463 -j to2050new.tzs' is now much faster on a multiprocessor host
466 When built with -DSUPPRESS_TZDIR, the tzcode library no longer
467 prepends TZDIR/ to file names that do not begin with '/'. This is
468 not recommended for general use, due to its security implications.
469 (From a suggestion by Manuela Friedrich.)
473 zic now accepts subsecond precision in expressions like
474 00:19:32.13, which is approximately the legal time of the
475 Netherlands from 1835 to 1937. However, because it is
476 questionable whether the few recorded uses of non-integer offsets
477 had subsecond precision in practice, there are no plans for tzdata
478 to use this feature. (Thanks to Steve Allen for pointing out
479 the limitations of historical data in this area.)
481 The code is a bit more portable to MS-Windows. Installers can
482 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
483 reserve identifiers like 'localtime'. (Thanks to Manuela
486 Changes to documentation and commentary
488 theory.html now outlines tzdb's extensions to POSIX's model for
489 civil time, and has a section "POSIX features no longer needed"
490 that lists POSIX API components that are now vestigial.
491 (From suggestions by Steve Summit.) It also better distinguishes
492 time zones from tz regions. (From a suggestion by Guy Harris.)
494 Commentary is now more consistent about using the phrase "daylight
495 saving time", to match the C name tm_isdst. Daylight saving time
496 need not occur in summer, and need not have a positive offset from
499 Commentary about historical transitions in Uruguay has been expanded
500 with links to many relevant legal documents.
501 (Thanks to Tim Parenti.)
503 Commentary now uses some non-ASCII characters with Unicode value
504 less than U+0100, as they can be useful and should work even with
505 older editors such as XEmacs.
508 Release 2018c - 2018-01-22 23:00:44 -0800
511 Revert Irish changes that relied on negative SAVE values.
515 Revert the 2018a change to Europe/Dublin. As before, this change
516 does not affect UT offsets or abbreviations; it affects only
517 whether timestamps are considered to be standard time or
518 daylight-saving time, as expressed in the tm_isdst flag of C's
519 struct tm type. This reversion is intended to be a temporary
520 workaround for problems discovered with downstream uses of
521 releases 2018a and 2018b, which implemented Irish time by using
522 negative SAVE values in the Eire rules of the 'europe' file.
523 Although negative SAVE values have been part of tzcode for many
524 years and are supported by many platforms, they were not
525 documented before 2018a and ICU and OpenJDK do not currently
526 support them. A mechanism to export data to platforms lacking
527 support for negative DST is planned to be developed before the
528 change is reapplied. (Problems reported by Deborah Goldsmith and
531 Changes to past timestamps
533 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
534 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
536 Changes to build procedure
538 The build procedure now works around mawk 1.3.3's lack of support
539 for character class expressions. (Problem reported by Ohyama.)
542 Release 2018b - 2018-01-17 23:24:48 -0800
545 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
547 Changes to build procedure
549 The distribution now contains the file 'pacificnew' again.
550 This file was inadvertantly omitted in the 2018a distribution.
551 (Problem reported by Matias Fonzo.)
554 Release 2018a - 2018-01-12 22:29:21 -0800
557 São Tomé and Príncipe switched from +00 to +01.
558 Brazil's DST will now start on November's first Sunday.
559 Ireland's standard time is now in the summer, not the winter.
560 Use Debian-style installation locations, instead of 4.3BSD-style.
563 Changes to past and future timestamps
565 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
566 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
568 Changes to future timestamps
570 Starting in 2018 southern Brazil will begin DST on November's
571 first Sunday instead of October's third Sunday. (Thanks to
574 Changes to past timestamps
576 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
577 been corrected. The 'backzone' and 'zone.tab' files did not agree
578 with the 'africa' and 'zone1970.tab' files. (Problem reported by
581 The abbreviation invented for Bolivia Summer Time (1931-2) is now
582 BST instead of BOST, to be more consistent with the convention
583 used for Latvian Summer Time (1918-9) and for British Summer Time.
587 Change Europe/Dublin so that it observes Irish Standard Time (UT
588 +01) in summer and GMT (as negative daylight-saving) in winter,
589 instead of observing standard time (GMT) in winter and Irish
590 Summer Time (UT +01) in summer. This change does not affect UT
591 offsets or abbreviations; it affects only whether timestamps are
592 considered to be standard time or daylight-saving time, as
593 expressed in the tm_isdst flag of C's struct tm type.
594 (Discrepancy noted by Derick Rethans.)
596 Changes to build procedure
598 The default installation locations have been changed to mostly
599 match Debian circa 2017, instead of being designed as an add-on to
600 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
601 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
602 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
603 locations more precisely. (This responds to suggestions from
604 Brian Inglis and from Steve Summit.)
606 The default installation procedure no longer creates the
607 backward-compatibility link US/Pacific-New, which causes
608 confusion during user setup (e.g., see Debian bug 815200).
609 Use 'make BACKWARD="backward pacificnew"' to create the link
610 anyway, for now. Eventually we plan to remove the link entirely.
612 tzdata.zi now contains a version-number comment.
613 (Suggested by Tom Lane.)
615 The Makefile now quotes values like BACKWARD more carefully when
616 passing them to the shell. (Problem reported by Zefram.)
618 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
619 that have snprintf and use pre-C99 compilers. (Problem reported
624 zic has a new option -t FILE that specifies the location of the
625 file that determines local time when TZ is unset. The default for
626 this location can be configured via the new TZDEFAULT makefile
627 macro, which defaults to /etc/localtime.
629 Diagnostics and commentary now distinguish UT from UTC more
630 carefully; see theory.html for more information about UT vs UTC.
632 zic has been ported to GCC 8's -Wstringop-truncation option.
633 (Problem reported by Martin Sebor.)
635 Changes to documentation and commentary
637 The zic man page now documents the longstanding behavior that
638 times and years can be out of the usual range, with negative times
639 counting backwards from midnight and with year 0 preceding year 1.
640 (Problem reported by Michael Deckers.)
642 The theory.html file now mentions the POSIX limit of six chars
643 per abbreviation, and lists alphabetic abbreviations used.
645 The files tz-art.htm and tz-link.htm have been renamed to
646 tz-art.html and tz-link.html, respectively, for consistency with
647 other file names and to simplify web server configuration.
650 Release 2017c - 2017-10-20 14:49:34 -0700
653 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
654 Fiji ends DST 2018-01-14, not 2018-01-21.
655 Namibia switches from +01/+02 to +02 on 2018-04-01.
656 Sudan switches from +03 to +02 on 2017-11-01.
657 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
658 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
659 A new file tzdata.zi now holds a small text copy of all data.
660 The zic input format has been regularized slightly.
662 Changes to future timestamps
664 Northern Cyprus has decided to resume EU rules starting
665 2017-10-29, thus reinstituting winter time.
667 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
668 predicted. (Thanks to Dominic Fok.) Adjust future predictions
671 Namibia will switch from +01 with DST to +02 all year on
672 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
673 at 02:00. (Thanks to Steffen Thorsen.)
675 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
676 Atyya and Yahia Abdalla.) South Sudan is not switching, so
677 Africa/Juba is no longer a link to Africa/Khartoum.
679 Tonga has likely ended its experiment with DST, and will not
680 adjust its clocks on 2017-11-05. Although Tonga has not announced
681 whether it will continue to observe DST, the IATA is assuming that
682 it will not. (Thanks to David Wade.)
684 Turks & Caicos will switch from -04 all year to -05 with US DST on
685 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
686 at 02:00. (Thanks to Steffen Thorsen.)
688 Changes to past timestamps
690 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
691 (Thanks to Arthur David Olson.)
693 Detroit did not observe DST in 1967.
695 Use railway time for Asia/Kolkata before 1941, by switching to
696 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
697 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
699 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
700 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
702 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
703 American time in 1892, not 1879. (Thanks to Michael Deckers.)
705 Adjust the 1867 transition in Alaska to better reflect the
706 historical record, by changing it to occur on 1867-10-18 at 15:30
707 Sitka time rather than at the start of 1867-10-17 local time.
708 Although strictly speaking this is accurate only for Sitka,
709 the rest of Alaska's blanks need to be filled in somehow.
711 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
712 (Thanks to Michael Deckers.)
714 Add 7 s to the UT offset in Asia/Yangon before 1920.
716 Changes to zone names
718 Remove Canada/East-Saskatchewan from the 'backward' file, as it
719 exceeded the 14-character limit and was an unused misnomer anyway.
721 Changes to build procedure
723 To support applications that prefer to read time zone data in text
724 form, two zic input files tzdata.zi and leapseconds are now
725 installed by default. The commands 'zic tzdata.zi' and 'zic -L
726 leapseconds tzdata.zi' can reproduce the tzdata binary files
727 without and with leap seconds, respectively. To prevent these two
728 new files from being installed, use 'make TZDATA_TEXT=', and to
729 suppress leap seconds from the tzdata text installation, use 'make
730 TZDATA_TEXT=tzdata.zi'.
732 'make BACKWARD=' now suppresses backward-compatibility names
733 like 'US/Pacific' that are defined in the 'backward' and
736 'make check' now works on systems that lack a UTF-8 locale,
737 or that lack the nsgmls program. Set UTF8_LOCALE to configure
738 the name of a UTF-8 locale, if you have one.
740 Y2K runtime checks are no longer enabled by default. Add
741 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
742 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
743 to disable them. (New name suggested by Brian Inglis.)
745 The build procedure for zdump now works on AIX 7.1.
746 (Problem reported by Kees Dekker.)
750 zic and the reference runtime now reject multiple leap seconds
751 within 28 days of each other, or leap seconds before the Epoch.
752 As a result, support for double leap seconds, which was
753 obsolescent and undocumented, has been removed. Double leap
754 seconds were an error in the C89 standard; they have never existed
755 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
756 noticing glitches in the code that uncovered this problem.)
758 zic now warns about use of the obsolescent and undocumented -y
759 option, and about use of the obsolescent TYPE field of Rule lines.
761 zic now allows unambiguous abbreviations like "Sa" and "Su" for
762 weekdays; formerly it rejected them due to a bug. Conversely, zic
763 no longer considers non-prefixes to be abbreviations; for example,
764 it no longer accepts "lF" as an abbreviation for "lastFriday".
765 Also, zic warns about the undocumented usage with a "last-"
766 prefix, e.g., "last-Fri".
768 Similarly, zic now accepts the unambiguous abbreviation "L" for
769 "Link" in ordinary context and for "Leap" in leap-second context.
770 Conversely, zic no longer accepts non-prefixes such as "La" as
771 abbreviations for words like "Leap".
773 zic no longer accepts leap second lines in ordinary input, or
774 ordinary lines in leap second input. Formerly, zic sometimes
775 warned about this undocumented usage and handled it incorrectly.
777 The new macro HAVE_TZNAME governs whether the tzname external
778 variable is exported, instead of USG_COMPAT. USG_COMPAT now
779 governs only the external variables "timezone" and "daylight".
780 This change is needed because the three variables are not in the
781 same category: although POSIX requires tzname, it specifies the
782 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
783 if not defined, the code attempts to guess it from other macros.
785 localtime.c and difftime.c no longer require stdio.h, and .c files
786 other than zic.c no longer require sys/wait.h.
788 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
790 Calculation of time_t extrema works around a bug in GCC 4.8.4
791 (Reported by Stan Shebs and Joseph Myers.)
793 zic.c no longer mistranslates formats of line numbers in non-English
794 locales. (Problem reported by Benno Schulenberg.)
796 Several minor changes have been made to the code to make it a
797 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
798 Dekker for reporting the problems.)
800 Changes to documentation and commentary
802 The two new files 'theory.html' and 'calendars' contain the
803 contents of the removed file 'Theory'. The goal is to document
804 tzdb theory more accessibly.
806 The zic man page now documents abbreviation rules.
808 tz-link.htm now covers how to apply tzdata changes to clients.
809 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
811 The leap-seconds.list URL has been updated to something that is
812 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
814 Release 2017b - 2017-03-17 07:30:38 -0700
816 Briefly: Haiti has resumed DST.
818 Changes to past and future timestamps
820 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
822 Changes to past timestamps
824 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
826 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
827 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
831 The reference localtime implementation now falls back on the
832 current US daylight-saving transition rules rather than the
833 1987-2006 rules. This fallback occurs only when (1) the TZ
834 environment variable has a value like "AST4ADT" that asks
835 for daylight saving time but does not specify the rules, (2) there
836 is no file by that name, and (3) the TZDEFRULES file cannot be
837 loaded. (Thanks to Tom Lane.)
840 Release 2017a - 2017-02-28 00:05:36 -0800
842 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
845 Changes to future timestamps
847 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
849 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
850 Its clocks diverge from America/Santiago starting 2017-05-13 at
851 23:00, hiving off a new zone America/Punta_Arenas. Although the
852 Chilean government says this change expires in May 2019, for now
853 assume it's permanent. (Thanks to Juan Correa and Deborah
854 Goldsmith.) This also affects Antarctica/Palmer.
856 Changes to past timestamps
858 Fix many entries for historical timestamps for Europe/Madrid
859 before 1979, to agree with tables compiled by Pere Planesas of the
860 National Astronomical Observatory of Spain. As a side effect,
861 this changes some timestamps for Africa/Ceuta before 1929, which
862 are probably guesswork anyway. (Thanks to Steve Allen and
863 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
864 correcting the 1901 transition.)
866 Ecuador observed DST from 1992-11-28 to 1993-02-05.
867 (Thanks to Alois Treindl.)
869 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
870 (Thanks to Stepan Golosunov.)
872 Changes to past and future time zone abbreviations
874 Switch to numeric time zone abbreviations for South America, as
875 part of the ongoing project of removing invented abbreviations.
876 This avoids the need to invent an abbreviation for the new Chilean
877 new zone. Similarly, switch from invented to numeric time zone
878 abbreviations for Afghanistan, American Samoa, the Azores,
879 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
880 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
881 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
882 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
883 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
884 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
885 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
886 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
887 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
888 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
889 for half-hour daylight saving time in Belize before 1944 and in
890 the Dominican Republic before 1975; and for Canary Islands before
891 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
892 Indian Summer Time before 1942, for Indonesia before around 1964,
893 for Kenya before 1960, for Liberia before 1973, for Madeira before
894 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
895 Pakistan before 1971, for Western Sahara before 1977, and for
896 Zaporozhye in 1880-1924.
898 For Alaska time from 1900 through 1967, instead of "CAT" use the
899 abbreviation "AST", the abbreviation commonly used at the time
900 (Atlantic Standard Time had not been standardized yet). Use "AWT"
901 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
903 Use "CST" and "CDT" instead of invented abbreviations for Macau
904 before 1999 and Taiwan before 1938, and use "JST" instead of the
905 invented abbreviation "JCST" for Japan and Korea before 1938.
907 Change to database entry category
909 Move the Pacific/Johnston link from 'australasia' to 'backward',
910 since Johnston is now uninhabited.
914 zic no longer mishandles some transitions in January 2038 when it
915 attempts to work around Qt bug 53071. This fixes a bug affecting
916 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
917 now contains a workaround, useful when loading a file generated by
918 a buggy zic. (Problem and localtime.c fix reported by Bradley
921 zdump -i now outputs non-hour numeric time zone abbreviations
922 without a colon, e.g., "+0530" rather than "+05:30". This agrees
923 with zic %z and with common practice, and simplifies auditing of
926 zdump is now buildable again with -DUSE_LTZ=0.
927 (Problem reported by Joseph Myers.)
929 zdump.c now always includes private.h, to avoid code duplication
930 with private.h. (Problem reported by Kees Dekker.)
932 localtime.c no longer mishandles early or late timestamps
933 when TZ is set to a POSIX-style string that specifies DST.
934 (Problem reported by Kees Dekker.)
936 date and strftime now cause %z to generate "-0000" instead of
937 "+0000" when the UT offset is zero and the time zone abbreviation
940 Changes to documentation and commentary
942 The 'Theory' file now better documents choice of historical time
943 zone abbreviations. (Problems reported by Michael Deckers.)
945 tz-link.htm now covers leap smearing, which is popular in clouds.
948 Release 2016j - 2016-11-22 23:17:13 -0800
950 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
952 Changes to future timestamps
954 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
955 This hives off a new zone Europe/Saratov from Europe/Volgograd.
956 (Thanks to Yuri Konotopov and Stepan Golosunov.)
958 Changes to past timestamps
960 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
961 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
962 1999, not fall 1994. (Thanks to Stepan Golosunov.)
964 Changes to past time zone abbreviations
966 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
967 summer time before 1948. The old use of "EET" was a typo.
971 zic no longer mishandles file systems that lack hard links, fixing
972 bugs introduced in 2016g. (Problems reported by Tom Lane.)
973 Also, when the destination already contains symbolic links, zic
974 should now work better on systems where the 'link' system call
975 does not follow symbolic links.
977 Changes to documentation and commentary
979 tz-link.htm now documents the relationship between release version
980 numbers and development-repository commit tags. (Suggested by
983 The 'Theory' file now documents UT.
985 iso3166.tab now accents "Curaçao", and commentary now mentions
986 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
989 Release 2016i - 2016-11-01 23:19:52 -0700
991 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
992 reintroduces DST on 2016-11-06.
994 Changes to future timestamps
996 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
997 2017-01-15 at 03:00. Assume future observances in Tonga will be
998 from the first Sunday in November through the third Sunday in
999 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
1000 time zone abbreviations for this zone.
1002 Changes to past and future timestamps
1004 Northern Cyprus is now +03 year round, causing a split in Cyprus
1005 time zones starting 2016-10-30 at 04:00. This creates a zone
1006 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
1008 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
1009 (Thanks to Steffen Thorsen.)
1011 Changes to past timestamps
1013 Several corrections were made for pre-1975 timestamps in Italy.
1014 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
1017 First, the 1893-11-01 00:00 transition in Italy used the new UT
1018 offset (+01), not the old (+00:49:56). (Thanks to Michael
1021 Second, rules for daylight saving in Italy were changed to agree
1022 with Italy's National Institute of Metrological Research (INRiM)
1023 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
1024 Inglis, and Michael Deckers):
1026 The 1916-06-03 transition was at 24:00, not 00:00.
1028 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
1031 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
1034 The 1944-09-17 transition was at 03:00, not 01:00. This
1035 particular change is taken from Italian law as INRiM's table,
1036 (which says 02:00) appears to have a typo here. Also, keep the
1037 1944-04-03 transition for Europe/Rome, as Rome was controlled by
1040 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
1045 The code should now be buildable on AmigaOS merely by setting the
1046 appropriate Makefile variables. (From a patch by Carsten Larsen.)
1049 Release 2016h - 2016-10-19 23:17:57 -0700
1051 Changes to future timestamps
1053 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
1054 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
1055 future fall transitions will be on the last Saturday of October
1056 at 01:00, which is consistent with predicted spring transitions
1057 on the last Saturday of March. (Thanks to Tim Parenti.)
1059 Changes to past timestamps
1061 In Turkey, transitions in 1986-1990 were at 01:00 standard time
1062 not at 02:00, and the spring 1994 transition was on March 20, not
1063 March 27. (Thanks to Kıvanç Yazan.)
1065 Changes to past and future time zone abbreviations
1067 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
1068 instead of alphabetic ones like "IST" and "LKT". Various
1069 English-language sources use "IST", "LKT" and "SLST", with no
1070 working consensus. (Usage of "SLST" mentioned by Sadika
1075 zic no longer mishandles relativizing file names when creating
1076 symbolic links like /etc/localtime, when these symbolic links
1077 are outside the usual directory hierarchy. This fixes a bug
1078 introduced in 2016g. (Problem reported by Andreas Stieger.)
1080 Changes to build procedure
1082 New rules 'traditional_tarballs' and 'traditional_signatures' for
1083 building just the traditional-format distribution. (Requested by
1086 The file 'version' is now put into the tzdata tarball too.
1087 (Requested by Howard Hinnant.)
1089 Changes to documentation and commentary
1091 The 'Theory' file now has a section on interface stability.
1092 (Requested by Paul Koning.) It also mentions features like
1093 tm_zone and localtime_rz that have long been supported by the
1096 tz-link.htm has improved coverage of time zone boundaries suitable
1097 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
1100 The US commentary now mentions Allen and the "day of two noons".
1102 The Fiji commentary mentions the government's 2016-10-03 press
1103 release. (Thanks to Raymond Kumar.)
1106 Release 2016g - 2016-09-13 08:56:38 -0700
1108 Changes to future timestamps
1110 Turkey switched from EET/EEST (+02/+03) to permanent +03,
1111 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
1112 than an invented abbreviation for the new time.
1114 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
1115 (Thanks to Tim Parenti.)
1117 Changes to past timestamps
1119 For America/Los_Angeles, spring-forward transition times have been
1120 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
1123 For zones using Soviet time on 1919-07-01, transitions to UT-based
1124 time were at 00:00 UT, not at 02:00 local time. The affected
1125 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
1126 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
1128 Changes to past and future time zone abbreviations
1130 The Factory zone now uses the time zone abbreviation -00 instead
1131 of a long English-language string, as -00 is now the normal way to
1132 represent an undefined time zone.
1134 Several zones in Antarctica and the former Soviet Union, along
1135 with zones intended for ships at sea that cannot use POSIX TZ
1136 strings, now use numeric time zone abbreviations instead of
1137 invented or obsolete alphanumeric abbreviations. The affected
1138 zones are Antarctica/Casey, Antarctica/Davis,
1139 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
1140 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
1141 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
1142 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
1143 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
1144 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
1145 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
1146 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
1147 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
1148 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
1149 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
1150 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
1151 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
1152 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
1153 was replaced by +05, whereas MSK and MSD were kept as they are not
1154 our invention and are widely used.
1156 Changes to zone names
1158 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
1159 (Thanks to David Massoud.)
1163 zic no longer generates binary files containing POSIX TZ-like
1164 strings that disagree with the local time type after the last
1165 explicit transition in the data. This fixes a bug with
1166 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
1167 on the reference platform. (Thanks to Alexander Belopolsky for
1168 reporting the bug and suggesting a way forward.)
1170 If the installed localtime and/or posixrules files are symbolic
1171 links, zic now keeps them symbolic links when updating them, for
1172 compatibility with platforms like OpenSUSE where other programs
1173 configure these files as symlinks.
1175 zic now avoids hard linking to symbolic links, avoids some
1176 unnecessary mkdir and stat system calls, and uses shorter file
1179 zdump has a new -i option to generate transitions in a
1180 more-compact but still human-readable format. This option is
1181 experimental, and the output format may change in future versions.
1182 (Thanks to Jon Skeet for suggesting that an option was needed,
1183 and thanks to Tim Parenti and Chris Rovick for further comments.)
1185 Changes to build procedure
1187 An experimental distribution format is available, in addition
1188 to the traditional format which will continue to be distributed.
1189 The new format is a tarball tzdb-VERSION.tar.lz with signature
1190 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
1191 tzdb-VERSION containing the code and data of the traditional
1192 two-tarball format, along with extra data that may be useful.
1193 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
1194 for comments about the experimental format.)
1196 The release version number is now more accurate in the usual case
1197 where releases are built from a Git repository. For example, if
1198 23 commits and some working-file changes have been made since
1199 release 2016g, the version number is now something like
1200 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
1201 Tagged releases use the same version number format as before,
1202 e.g., '2016g'. To support the more-accurate version number, its
1203 specification has moved from a line in the Makefile to a new
1204 source file 'version'.
1206 The experimental distribution contains a file to2050.tzs that
1207 contains what should be the output of 'zdump -i -c 2050' on
1208 primary zones. If this file is available, 'make check' now checks
1209 that zdump generates this output.
1211 'make check_web' now works on Fedora-like distributions.
1213 Changes to documentation and commentary
1215 tzfile.5 now documents the new restriction on POSIX TZ-like
1216 strings that is now implemented by zic.
1218 Comments now cite URLs for some 1917-1921 Russian DST decrees.
1219 (Thanks to Alexander Belopolsky.)
1221 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
1222 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
1223 description of Java 8 has been brought up to date (thanks to
1224 Stephen Colebourne). Its description of local time on Mars has
1225 been updated to match current practice, and URLs have been updated
1226 and some obsolete ones removed.
1229 Release 2016f - 2016-07-05 16:26:51 +0200
1231 Changes affecting future timestamps
1233 The Egyptian government changed its mind on short notice, and
1234 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
1235 (Thanks to Mina Samuel.)
1237 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
1238 (Thanks to Stepan Golosunov.)
1240 Changes to past and future timestamps
1242 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
1243 abbreviations instead of invented ones.
1245 Changes affecting past timestamps
1247 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
1248 (Thanks to Stepan Golosunov.)
1251 Release 2016e - 2016-06-14 08:46:16 -0700
1253 Changes affecting future timestamps
1255 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
1256 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
1257 For future years, guess April's last Thursday to October's last
1258 Thursday except for Ramadan.
1260 Changes affecting past timestamps
1262 Locations while uninhabited now use '-00', not 'zzz', as a
1263 placeholder time zone abbreviation. This is inspired by Internet
1264 RFC 3339 and is more consistent with numeric time zone
1265 abbreviations already used elsewhere. The change affects several
1266 arctic and antarctic locations, e.g., America/Cambridge_Bay before
1267 1920 and Antarctica/Troll before 2005.
1269 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
1270 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
1274 zic now outputs a dummy transition at time 2**31 - 1 in zones
1275 whose POSIX-style TZ strings contain a '<'. This mostly works
1276 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
1277 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
1279 Changes affecting documentation and commentary
1281 tz-link.htm says why governments should give plenty of notice for
1282 time zone or DST changes, and refers to Matt Johnson's blog post.
1284 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
1287 Release 2016d - 2016-04-17 22:50:29 -0700
1289 Changes affecting future timestamps
1291 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
1292 (Thanks to Alexander Krivenyshev for the heads-up.)
1294 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
1295 (Thanks to Alexander Krivenyshev and Matt Johnson.)
1297 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
1298 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
1299 at 02:00. (Thanks to Stepan Golosunov.)
1301 Changes affecting past timestamps
1303 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
1304 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1305 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1306 the same change. (Thanks to Stepan Golosunov.)
1308 Russia and nearby locations had daylight-saving transitions on
1309 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1310 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
1313 Many corrections to historical time in Kazakhstan from 1991
1314 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
1315 invented time zone abbreviations with numeric abbreviations.
1317 Changes to commentary
1319 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1322 Release 2016c - 2016-03-23 00:51:27 -0700
1324 Changes affecting future timestamps
1326 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
1328 Chile reverts from permanent to seasonal DST. (Thanks to Juan
1329 Correa for the heads-up, and to Tim Parenti for corrections.)
1330 Guess that future transitions are August's and May's second
1331 Saturdays at 24:00 mainland time. Also, call the period from
1332 2014-09-07 through 2016-05-14 daylight saving time instead of
1333 standard time, as that seems more appropriate now.
1335 Changes affecting past timestamps
1337 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1338 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1339 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1340 (Thanks to Stepan Golosunov.)
1342 Changes to commentary
1344 Several updates and URLs for historical and proposed Russian changes.
1345 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1348 Release 2016b - 2016-03-12 17:30:14 -0800
1352 Starting with release 2016b, some data entries cause zic implementations
1353 derived from tz releases 2005j through 2015e to issue warnings like
1354 "time zone abbreviation differs from POSIX standard (+03)".
1355 These warnings should not otherwise affect zic's output and can safely be
1356 ignored on today's platforms, as the warnings refer to a restriction in
1357 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
1358 warnings is to upgrade to zic derived from tz releases 2015f and later.
1360 Changes affecting future timestamps
1362 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1363 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1364 2016-03-27 at 02:00 local time. They need distinct zones since their
1365 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
1366 Altai Republic, Russia, which will switch from +06 to +07 on the same date
1367 and local time. The Astrakhan change is already official; the others have
1368 passed the first reading in the State Duma and are extremely likely.
1369 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1370 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1371 and Stepan Golosunov for followup.)
1373 As a trial of a new system that needs less information to be made up,
1374 the new zones use numeric time zone abbreviations like "+04"
1375 instead of invented abbreviations like "ASTT".
1377 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
1380 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1381 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1382 Saturday at 01:00, not March's last Friday at 24:00.
1384 Changes affecting past timestamps
1386 Europe/Chisinau observed DST during 1990, and switched from +04 to
1387 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1388 (Thanks to Stepan Golosunov.)
1390 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1391 KUYT/KUYST. (Thanks to Stepan Golosunov.)
1395 tzselect's diagnostics and checking, and checktab.awk's checking,
1396 have been improved. (Thanks to J William Piggott.)
1398 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
1400 tzselect now tests Julian-date TZ settings more accurately.
1401 (Thanks to J William Piggott.)
1403 Changes to commentary
1405 Comments in zone tables have been improved. (Thanks to J William Piggott.)
1407 tzselect again limits its menu comments so that menus fit on a
1408 24×80 alphanumeric display.
1410 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
1412 In the Theory file, the description of possible time zone abbreviations in
1413 tzdata has been cleaned up, as the old description was unclear and
1414 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
1417 Release 2016a - 2016-01-26 23:28:02 -0800
1419 Changes affecting future timestamps
1421 America/Cayman will not observe daylight saving this year after all.
1422 Revert our guess that it would. (Thanks to Matt Johnson.)
1424 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1425 (Thanks to Alexander Krivenyshev.)
1427 Asia/Tehran now has DST predictions for the year 2038 and later,
1428 to be March 21 00:00 to September 21 00:00. This is likely better
1429 than predicting no DST, albeit off by a day every now and then.
1431 Changes affecting past and future timestamps
1433 America/Metlakatla switched from PST all year to AKST/AKDT on
1434 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1436 America/Santa_Isabel has been removed, and replaced with a
1437 backward compatibility link to America/Tijuana. Its contents were
1438 apparently based on a misreading of Mexican legislation.
1440 Changes affecting past timestamps
1442 Asia/Karachi's two transition times in 2002 were off by a minute.
1443 (Thanks to Matt Johnson.)
1445 Changes affecting build procedure
1447 An installer can now combine leap seconds with use of the backzone file,
1448 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1449 The old 'make posix_packrat' rule is now marked as obsolescent.
1450 (Thanks to Ian Abbott for an initial implementation.)
1452 Changes affecting documentation and commentary
1454 A new file LICENSE makes it easier to see that the code and data
1455 are mostly public-domain. (Thanks to James Knight.) The three
1456 non-public-domain files now use the current (3-clause) BSD license
1457 instead of older versions of that license.
1459 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1460 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1461 on editing tz source files (with a mention of Sublime zoneinfo,
1462 thanks to Gilmore Davidson).
1464 The Theory and asia files now mention the 2015 book "The Global
1465 Transformation of Time, 1870-1950", and cite a couple of reviews.
1467 The America/Chicago entry now documents the informal use of US
1468 central time in Fort Pierre, South Dakota. (Thanks to Rick
1469 McDermid, Matt Johnson, and Steve Jones.)
1472 Release 2015g - 2015-10-01 00:39:51 -0700
1474 Changes affecting future timestamps
1476 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1479 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1480 (Thanks to Alexander Krivenyshev.)
1482 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1483 (Thanks to Ken Rylander.)
1485 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
1486 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1487 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
1489 Changes affecting past timestamps
1491 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1493 Changes affecting code
1495 localtime no longer mishandles America/Anchorage after 2037.
1496 (Thanks to Bradley White for reporting the bug.)
1498 On hosts with signed 32-bit time_t, localtime no longer mishandles
1499 Pacific/Fiji after 2038-01-16 14:00 UTC.
1501 The localtime module allows the variables 'timezone', 'daylight',
1502 and 'altzone' to be in common storage shared with other modules,
1503 and declares them in case the system <time.h> does not.
1504 (Problems reported by Kees Dekker.)
1506 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1507 This simplifies the code and is consistent with zdump.c.
1508 (Problem reported by Christos Zoulas.)
1510 Changes affecting documentation
1512 The tzfile man page now documents that transition times denote the
1513 starts (not the ends) of the corresponding time periods.
1514 (Ambiguity reported by Bill Seymour.)
1517 Release 2015f - 2015-08-10 18:06:56 -0700
1519 Changes affecting future timestamps
1521 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1522 The abbreviation remains "KST". (Thanks to Robert Elz.)
1524 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1527 Changes affecting past and future timestamps
1529 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1530 (Thanks to Roman Tudos.)
1532 Changes affecting data format and code
1534 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1535 field of a Rule line should now be '-'; the old values 'even',
1536 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1537 Although the implementation has not changed, these features do not
1538 work in the default installation, they are not used in the data,
1539 and they are now considered obsolescent.
1541 zic now checks that two rules don't take effect at the same time.
1542 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1543 simultaneity are now documented.
1545 The two characters '%z' in a zone format now stand for the UT
1546 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1547 five hours and thirty minutes ahead. This better supports time
1548 zone abbreviations conforming to POSIX.1-2001 and later.
1550 Changes affecting installed data files
1552 Comments for America/Halifax and America/Glace_Bay have been improved.
1553 (Thanks to Brian Inglis.)
1555 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1556 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1557 installed data files for Europe/Simferopol and Europe/Tallinn.
1558 It does not affect timestamps. (Thanks to Howard Hinnant.)
1560 Changes affecting code
1562 zdump and zic no longer warn about valid time zone abbreviations
1565 Some Visual Studio 2013 warnings have been suppressed.
1566 (Thanks to Kees Dekker.)
1568 'date' no longer sets the time of day and its -a, -d, -n and -t
1569 options have been removed. Long obsolescent, the implementation
1570 of these features had porting problems. Builders no longer need
1571 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1572 (Thanks to Kees Dekker for pointing out the problem.)
1574 Changes affecting documentation
1576 The Theory file mentions naming issues earlier, as these seem to be
1577 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1579 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1581 Mention that Herbert Samuel introduced the term "Summer Time".
1584 Release 2015e - 2015-06-13 10:56:02 -0700
1586 Changes affecting future timestamps
1588 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1589 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1591 Assume Cayman Islands will observe DST starting next year, using US rules.
1592 Although it isn't guaranteed, it is the most likely.
1594 Changes affecting data format
1596 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1597 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1599 Changes affecting code
1601 When displaying data, tzselect converts it to the current locale's
1602 encoding if the iconv command works. (Problem reported by random832.)
1604 tzselect no longer mishandles Dominica, fixing a bug introduced
1605 in Release 2014f. (Problem reported by Owen Leibman.)
1607 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1608 This fixes a bug introduced in Release 2014f.
1609 (Problem reported by Leonardo Chiquitto.)
1612 Release 2015d - 2015-04-24 08:09:46 -0700
1614 Changes affecting future timestamps
1616 Egypt will not observe DST in 2015 and will consider canceling it
1617 permanently. For now, assume no DST indefinitely.
1618 (Thanks to Ahmed Nazmy and Tim Parenti.)
1620 Changes affecting past timestamps
1622 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1623 1966-07-01. Also, Yukon's time zone history is documented better.
1624 (Thanks to Brian Inglis and Dennis Ferguson.)
1626 Change affecting past and future time zone abbreviations
1628 The abbreviations for Hawaii-Aleutian standard and daylight times
1629 have been changed from HAST/HADT to HST/HDT, as per US Government
1630 Printing Office style. This affects only America/Adak since 1983,
1631 as America/Honolulu was already using the new style.
1633 Changes affecting code
1635 zic has some minor performance improvements.
1638 Release 2015c - 2015-04-11 08:55:55 -0700
1640 Changes affecting future timestamps
1642 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1643 not 00:00 on April's last Friday. 2015's transition will therefore be on
1644 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1645 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1647 Changes affecting past timestamps
1649 The following changes affect some pre-1991 Chile-related timestamps
1650 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1652 The 1910 transition was January 10, not January 1.
1654 The 1918 transition was September 10, not September 1.
1656 The UT -04 time observed from 1932 to 1942 is now considered to
1657 be standard time, not year-round DST.
1659 Santiago observed DST (UT -03) from 1946-07-15 through
1660 1946-08-31, then reverted to standard time, then switched to -05
1663 Assume transitions before 1968 were at 00:00, since we have no data
1666 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1667 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1669 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1670 and omit all transitions on Pacific/Easter from 1942 through 1946
1671 since we have no data suggesting that they existed.
1673 One more zone has been turned into a link, as it differed
1674 from an existing zone only for older timestamps. As usual,
1675 this change affects UT offsets in pre-1970 timestamps only.
1676 The zone's old contents have been moved to the 'backzone' file.
1677 The affected zone is America/Montreal.
1679 Changes affecting commentary
1681 Mention the TZUpdater tool.
1683 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1686 Release 2015b - 2015-03-19 23:28:11 -0700
1688 Changes affecting future timestamps
1690 Mongolia will start observing DST again this year, from the last
1691 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1692 (Thanks to Ganbold Tsagaankhuu.)
1694 Palestine will start DST on March 28, not March 27. Also,
1695 correct the fall 2014 transition from September 26 to October 24.
1696 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1698 Changes affecting past timestamps
1700 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1701 regression. (Thanks to Stuart Bishop for reporting the problem.)
1703 Some more zones have been turned into links, when they differed
1704 from existing zones only for older timestamps. As usual,
1705 these changes affect UT offsets in pre-1970 timestamps only.
1706 Their old contents have been moved to the 'backzone' file.
1707 The affected zones are: America/Antigua, America/Cayman,
1708 Pacific/Midway, and Pacific/Saipan.
1710 Changes affecting time zone abbreviations
1712 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1715 Changes affecting code
1717 Fix integer overflow bug in reference 'mktime' implementation.
1718 (Problem reported by Jörg Richter.)
1720 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1721 to be used in the same executable as standard-library time_t functions.
1722 (Problems reported by Bradley White.)
1724 Changes affecting commentary
1726 Cite the recent Mexican decree changing Quintana Roo's time zone.
1727 (Thanks to Carlos Raúl Perasso.)
1729 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1731 Update info about Mars time.
1734 Release 2015a - 2015-01-29 22:35:20 -0800
1736 Changes affecting future timestamps
1738 The Mexican state of Quintana Roo, represented by America/Cancun,
1739 will shift from Central Time with DST to Eastern Time without DST
1740 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1742 Chile will not change clocks in April or thereafter; its new standard time
1743 will be its old daylight saving time. This affects America/Santiago,
1744 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1746 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1747 (Thanks to Tim Parenti.)
1749 Changes affecting past timestamps
1751 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1752 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1753 Shanks about time in Iceland between 1837 and 1908.
1755 Some more zones have been turned into links, when they differed
1756 from existing zones only for older timestamps. As usual,
1757 these changes affect UT offsets in pre-1970 timestamps only.
1758 Their old contents have been moved to the 'backzone' file.
1759 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1762 Changes affecting code
1764 tzalloc now scrubs time zone abbreviations compatibly with the way
1765 that tzset always has, by replacing invalid bytes with '_' and by
1766 shortening too-long abbreviations.
1768 tzselect ports to POSIX awk implementations, no longer mishandles
1769 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1770 settings to the user. (Thanks to Stefan Kuhn.)
1772 Changes affecting build procedure
1774 'make check' now checks for links to links in the data.
1775 One such link (for Africa/Asmera) has been fixed.
1776 (Thanks to Stephen Colebourne for pointing out the problem.)
1778 Changes affecting commentary
1780 The leapseconds file commentary now mentions the expiration date.
1781 (Problem reported by Martin Burnicki.)
1783 Update Mexican Library of Congress URL.
1786 Release 2014j - 2014-11-10 17:37:11 -0800
1788 Changes affecting current and future timestamps
1790 Turks & Caicos' switch from US eastern time to UT -04 year-round
1791 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1792 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1794 Changes affecting past timestamps
1796 Many pre-1989 timestamps have been corrected for Asia/Seoul and
1797 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1798 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1799 longer guess that Pyongyang mimicked Seoul time after World War II,
1800 as this is politically implausible.
1802 Some more zones have been turned into links, when they differed
1803 from existing zones only for older timestamps. As usual,
1804 these changes affect UT offsets in pre-1970 timestamps only.
1805 Their old contents have been moved to the 'backzone' file.
1806 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1807 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1808 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1811 Changes affecting commentary
1813 The commentary is less enthusiastic about Shanks as a source,
1814 and is more careful to distinguish UT from UTC.
1817 Release 2014i - 2014-10-21 22:04:57 -0700
1819 Changes affecting future timestamps
1821 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1822 (Thanks to Ken Rylander for the heads-up.) Guess that future
1823 years will use a similar pattern.
1825 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1826 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1827 (Thanks to Kiley Walbom for the heads-up.)
1829 Changes affecting time zone abbreviations
1831 Since Belarus is not changing its clocks even though Moscow is,
1832 the time zone abbreviation in Europe/Minsk is changing from FET
1833 to its more-traditional value MSK on 2014-10-26 at 01:00.
1834 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1836 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1837 Indochina, to distinguish it better from ICT (+07).
1839 Changes affecting past timestamps
1841 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
1842 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1843 authoritative book). Asia/Ho_Chi_Minh has been added to
1844 zone1970.tab, to give tzselect users in Vietnam two choices,
1845 since north and south Vietnam disagreed after our 1970 cutoff.
1847 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1848 they differed from existing zones only for older timestamps. As
1849 usual, these changes affect pre-1970 timestamps only. Their old
1850 contents have been moved to the 'backzone' file.
1852 Changes affecting code
1854 The time-related library functions now set errno on failure, and
1855 some crashes in the new tzalloc-related library functions have
1856 been fixed. (Thanks to Christos Zoulas for reporting most of
1857 these problems and for suggesting fixes.)
1859 If USG_COMPAT is defined and the requested timestamp is standard time,
1860 the tz library's localtime and mktime functions now set the extern
1861 variable timezone to a value appropriate for that timestamp; and
1862 similarly for ALTZONE, daylight saving time, and the altzone variable.
1863 This change is a companion to the tzname change in 2014h, and is
1864 designed to make timezone and altzone more compatible with tzname.
1866 The tz library's functions now set errno to EOVERFLOW if they fail
1867 because the result cannot be represented. ctime and ctime_r now
1868 return NULL and set errno when a timestamp is out of range, rather
1869 than having undefined behavior.
1871 Some bugs associated with the new 2014g functions have been fixed.
1872 This includes a bug that largely incapacitated the new functions
1873 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1874 It also includes some uses of uninitialized variables after tzalloc.
1875 The new code uses the standard type 'ssize_t', which the Makefile
1876 now gives porting advice about.
1878 Changes affecting commentary
1880 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1883 Release 2014h - 2014-09-25 18:59:03 -0700
1885 Changes affecting past timestamps
1887 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1889 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1890 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1892 Some more zones have been turned into links, when they differed
1893 from existing zones only for older timestamps. As usual,
1894 these changes affect UT offsets in pre-1970 timestamps only.
1895 Their old contents have been moved to the 'backzone' file.
1896 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1897 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1898 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1900 Changes affecting code
1902 zdump -V and -v now output gmtoff= values on all platforms,
1903 not merely on platforms defining TM_GMTOFF.
1905 The tz library's localtime and mktime functions now set tzname to a value
1906 appropriate for the requested timestamp, and zdump now uses this
1907 on platforms not defining TM_ZONE, fixing a 2014g regression.
1908 (Thanks to Tim Parenti for reporting the problem.)
1910 The tz library no longer sets tzname if localtime or mktime fails.
1912 zdump -c no longer mishandles transitions near year boundaries.
1913 (Thanks to Tim Parenti for reporting the problem.)
1915 An access to uninitialized data has been fixed.
1916 (Thanks to Jörg Richter for reporting the problem.)
1918 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1919 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1920 and two threads race to initialize data used by gmtime-like functions.
1921 (Thanks to Andy Heninger for reporting the problems.)
1923 Changes affecting build procedure
1925 'make check' now checks better for properly-sorted data.
1927 Changes affecting documentation and commentary
1929 zdump's gmtoff=N output is now documented, and its isdst=D output
1930 is now documented to possibly output D values other than 0 or 1.
1932 zdump -c's treatment of years is now documented to use the
1933 Gregorian calendar and Universal Time without leap seconds,
1934 and its behavior at cutoff boundaries is now documented better.
1935 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1937 Programs are now documented to use the proleptic Gregorian calendar.
1938 (Thanks to Alan Barrett for the suggestion.)
1940 Fractional-second GMT offsets have been documented for civil time
1941 in 19th-century Chennai, Jakarta, and New York.
1944 Release 2014g - 2014-08-28 12:31:23 -0700
1946 Changes affecting future timestamps
1948 Turks & Caicos is switching from US eastern time to UT -04
1949 year-round, modeled as a switch on 2014-11-02 at 02:00.
1950 [As noted in 2014j, this switch was later delayed.]
1952 Changes affecting past timestamps
1954 Time in Russia or the USSR before 1926 or so has been corrected by
1955 a few seconds in the following zones: Asia/Irkutsk,
1956 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1957 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1958 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1959 Vladimir Karpinsky.)
1961 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1962 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1963 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1964 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1965 (Thanks to Stephen Colebourne for pointing to the decree.)
1967 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1969 A new file 'backzone' contains data which may appeal to
1970 connoisseurs of old timestamps, although it is out of scope for
1971 the tz database, is often poorly sourced, and contains some data
1972 that is known to be incorrect. The new file is not recommended
1973 for ordinary use and its entries are not installed by default.
1974 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1975 Isle of Man entries.)
1977 Some more zones have been turned into links, when they differed
1978 from existing zones only for older timestamps. As usual,
1979 these changes affect UT offsets in pre-1970 timestamps only.
1980 Their old contents have been moved to the 'backzone' file.
1981 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1982 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1983 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1985 Changes affecting code
1987 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1988 supplies functions for creating and using objects that represent
1989 timezones. The new functions are tzalloc, tzfree, localtime_rz,
1990 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1991 time2posix_z. They are intended for performance: for example,
1992 localtime_rz (unlike localtime_r) is trivially thread-safe without
1993 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1994 functions, and to Alan Barrett and Jonathan Lennox for helping to
1997 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1998 This lets zdump use tz features even if the system library lacks them.
1999 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
2000 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
2002 zdump now uses localtime_rz if available, as it's significantly faster,
2003 and it can help zdump better diagnose invalid timezone names.
2004 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
2005 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
2006 not available, zdump now uses localtime_r and tzset if available,
2007 as this is a bit cleaner and faster than plain localtime. Compile
2008 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
2009 lacks these two functions.
2011 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
2012 Although not needed for tz's own applications, which are single-threaded,
2013 this supports POSIX better if the tz library is used in multithreaded apps.
2015 Some crashes have been fixed when zdump or the tz library is given
2016 invalid or outlandish input.
2018 The tz library no longer mishandles leap seconds on platforms with
2019 unsigned time_t in timezones that lack ordinary transitions after 1970.
2021 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
2022 already defined, to make it easier to configure on common platforms.
2023 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
2025 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
2026 assumes that reading uninitialized memory yields garbage values
2027 but does not cause other problems such as traps.
2029 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
2030 more likely to guess right for ambiguous timestamps near
2031 transitions where tm_isdst does not change.
2033 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
2034 strftime_l for compatibility with recent versions of POSIX.
2035 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
2036 to 1 on recent POSIX versions, and to 0 otherwise.
2038 tzselect -c now uses a hybrid distance measure that works better
2039 in Africa. (Thanks to Alan Barrett for noting the problem.)
2041 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
2042 or when time_tz is defined.
2044 When HAVE_UTMPX_H is set the 'date' command now builds on systems
2045 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
2046 the date it updates the wtmpx file if _PATH_WTMPX is defined.
2047 This affects GNU/Linux and similar systems.
2049 For easier maintenance later, some C code has been simplified,
2050 some lint has been removed, and the code has been tweaked so that
2051 plain 'make' is more likely to work.
2053 The C type 'bool' is now used for boolean values, instead of 'int'.
2055 The long-obsolete LOCALE_HOME code has been removed.
2057 The long-obsolete 'gtime' function has been removed.
2059 Changes affecting build procedure
2061 'zdump' no longer links in ialloc.o, as it's not needed.
2063 'make check_time_t_alternatives' no longer assumes GNU diff.
2065 Changes affecting distribution tarballs
2067 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
2068 the tzdata tarball instead of the tzcode tarball, since they help
2069 maintain the data. The NEWS and Theory files are now also
2070 distributed in the tzdata tarball, as they're relevant for data.
2071 (Thanks to Alan Barrett for pointing this out.) Also, the
2072 leapseconds.awk file is no longer distributed in the tzcode
2073 tarball, since it belongs in the tzdata tarball (where 2014f
2074 inadvertently also distributed it).
2076 Changes affecting documentation and commentary
2078 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
2079 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
2082 The man pages have been updated to use function prototypes,
2083 to document thread-safe variants like localtime_r, and to document
2084 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
2087 The fields in Link lines have been renamed to be more descriptive
2088 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
2089 and LINK-TO has become LINK-NAME.
2091 tz-link.htm mentions the IETF's tzdist working group; Windows
2092 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
2094 Some broken URLs have been fixed in the commentary. (Thanks to
2097 Commentary about Philippines DST has been updated, and commentary
2098 on pre-1970 time in India has been added.
2101 Release 2014f - 2014-08-05 17:42:36 -0700
2103 Changes affecting future timestamps
2105 Russia will subtract an hour from most of its time zones on 2014-10-26
2106 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
2107 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
2108 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
2109 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
2110 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
2111 (Europe/Samara) are not changing their clocks. The changed zones are
2112 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
2113 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
2114 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
2115 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
2116 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
2117 but not its UTC offset. Two zones are added: Asia/Chita (split
2118 from Asia/Yakutsk, and also with two hours subtracted) and
2119 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
2120 subtracted). (Thanks to Tim Parenti for much of the above.)
2122 Changes affecting time zone abbreviations
2124 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
2125 and similarly for the other Australian zones. That is, for eastern
2126 standard and daylight saving time the abbreviations are AEST and AEDT
2127 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
2128 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
2129 This change does not affect UT offsets, only time zone abbreviations.
2130 (Thanks to Rich Tibbett and many others.)
2132 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
2133 effective 2014-10-26 at 02:00 local time.
2135 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
2136 has been changed from URUT to XJT. (Thanks to Luther Ma.)
2138 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
2139 Similarly, prefer EET/EEST for eastern European time in Russia.
2141 Change time zone abbreviations in (western) Samoa to use "ST" and
2142 "DT" suffixes, as this is more likely to match common practice.
2143 Prefix "W" to (western) Samoa time when its standard-time offset
2144 disagrees with that of American Samoa.
2146 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
2148 Time zone abbreviations have been updated for Japan's two time
2149 zones used 1896-1937. JWST now stands for Western Standard
2150 Time, and JCST for Central Standard Time (formerly this was CJT).
2151 These abbreviations are now used for time in Korea, Taiwan,
2152 and Sakhalin while controlled by Japan.
2154 Changes affecting past timestamps
2156 China's five zones have been simplified to two, since the post-1970
2157 differences in the other three seem to have been imaginary. The
2158 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
2159 removed; backwards-compatibility links still work, albeit with
2160 different behaviors for timestamps before May 1980. Asia/Urumqi's
2161 1980 transition to UT +08 has been removed, so that it is now at
2162 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
2163 Treindl sent helpful translations of two papers by Guo Qingsheng.)
2165 Some zones have been turned into links, when they differed from existing
2166 zones only for older UT offsets where data entries were likely invented.
2167 These changes affect UT offsets in pre-1970 timestamps only. This is
2168 similar to the change in release 2013e, except this time for western
2169 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
2170 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
2171 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
2172 Atlantic/St_Helena. This also affects the backwards-compatibility
2173 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
2174 Tim Parenti, and David Patte for reporting problems in earlier
2175 versions of this change.)
2177 Asia/Shanghai's pre-standard-time UT offset has been changed from
2178 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
2179 transition to standard time has been changed from 1928 to 1901.
2181 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
2182 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
2183 In 1946 it observed DST from 05-15 through 09-30; in 1947
2184 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
2185 (Thanks to Yu-Cheng Chuang.)
2187 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
2189 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
2190 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
2192 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
2193 period from 1911 to 1950.
2195 Pacific/Chatham has been changed to New Zealand standard time plus
2196 45 minutes for the period before 1957, reflecting a 1956 remark in
2197 the New Zealand parliament.
2199 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
2200 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
2201 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
2202 not 04-06 at 02:00; and there was no DST in 1920.
2204 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
2206 Time in Russia before 1927 or so has been corrected by a few seconds in
2207 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
2208 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
2209 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
2210 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
2212 Changes affecting data format
2214 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
2215 The new file's extended format allows multiple country codes per zone.
2216 The older file is still installed but is deprecated; its format is
2217 not changing and it will still be distributed for a while, but new
2218 applications should use the new file.
2220 The new file format simplifies maintenance of obscure locations.
2221 To test this, it adds coverage for the Crozet Islands and the
2222 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
2224 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
2225 It is still ASCII now, but commentary about the switch has been added.
2226 The new file 'zone1970.tab' already uses UTF-8.
2228 Changes affecting code
2230 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
2231 is defined. (Thanks to Elliott Hughes for reporting the problem.)
2233 'zic' no longer mishandles input when ignoring case in locales that
2234 are not compatible with English, e.g., unibyte Turkish locales when
2235 compiled with HAVE_GETTEXT.
2237 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
2238 they no longer use ASCII '-' as if it were a dash.
2240 'zic' now rejects output file names that contain '.' or '..' components.
2241 (Thanks to Tim Parenti for reporting the problem.)
2243 'zic -v' now warns about output file names that do not follow
2244 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
2245 David Olson for starting the ball rolling on this.)
2247 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
2249 Changes affecting build procedure
2251 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
2252 (Thanks to John Cochran.)
2254 Changes affecting documentation and commentary
2256 The 'Theory' file documents legacy names, the longstanding
2257 exceptions to the POSIX-inspired file name rules.
2259 The 'zic' documentation clarifies the role of time types when
2260 interpreting dates. (Thanks to Arthur David Olson.)
2262 Documentation and commentary now prefer UTF-8 to US-ASCII,
2263 allowing the use of proper accents in foreign words and names.
2264 Code and data have not changed because of this. (Thanks to
2265 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
2268 Non-HTML documentation and commentary now use plain-text URLs instead of
2269 HTML insertions, and are more consistent about bracketing URLs when they
2270 are not already surrounded by white space. (Thanks to suggestions by
2273 There is new commentary about Xujiahui Observatory, the five time-zone
2274 project in China from 1918 to 1949, timekeeping in Japanese-occupied
2275 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
2276 warlord Jin Shuren in the data.
2278 Commentary about the coverage of each Russian zone has been standardized.
2279 (Thanks to Tim Parenti).
2281 There is new commentary about contemporary timekeeping in Ethiopia.
2283 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
2285 There is new commentary about time in Poland in 1919.
2287 Proper credit has been given to DST inventor George Vernon Hudson.
2289 Commentary about time in Metlakatla, AK and Resolute, NU has been
2290 improved, with a new source for the former.
2292 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
2295 Commentary about permanent Antarctic bases has been updated.
2297 Several typos have been corrected. (Thanks to Tim Parenti for
2298 contributing some of these fixes.)
2300 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
2301 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
2302 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
2303 (Thanks to a heads-up from Dirkjan Ochtman.)
2305 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2306 have been removed. These obsolescent US Naval Observatory entries were no
2307 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
2310 Release 2014e - 2014-06-12 21:53:52 -0700
2312 Changes affecting near-future timestamps
2314 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2315 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
2316 switch to standard time at 24:00 the last Thursday before Ramadan, and
2317 back to DST at 00:00 the first Friday after Ramadan.
2319 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
2320 to Milamber Space Network.) Guess that from 2015 on Morocco will
2321 temporarily switch to standard time at 03:00 the last Saturday before
2322 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2324 Changes affecting past timestamps
2326 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2327 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
2328 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2329 in 1991. (Thanks to Hank W. for reporting the problems.)
2331 Changes affecting commentary
2333 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2334 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2335 removes stale pointers to World Time Explorer and WORLDTIME.
2338 Release 2014d - 2014-05-27 21:34:40 -0700
2340 Changes affecting code
2342 zic no longer generates files containing timestamps before the Big Bang.
2343 This works around GNOME glib bug 878
2344 <https://gitlab.gnome.org/GNOME/glib/issues/878>
2345 (Thanks to Leonardo Chiquitto for reporting the bug, and to
2346 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2348 Changes affecting documentation
2350 tz-link.htm now mentions GNOME.
2353 Release 2014c - 2014-05-13 07:44:13 -0700
2355 Changes affecting near-future timestamps
2357 Egypt observes DST starting 2014-05-15 at 24:00.
2358 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2359 Details have not been announced, except that DST will not be observed
2360 during Ramadan. Guess that DST will stop during the same Ramadan dates as
2361 Morocco, and that Egypt's future spring and fall transitions will be the
2362 same as 2010 when it last observed DST, namely April's last Friday at
2363 00:00 to September's last Thursday at 23:00 standard time. Also, guess
2364 that Ramadan transitions will be at 00:00 standard time.
2366 Changes affecting code
2368 zic now generates transitions for minimum time values, eliminating guesswork
2369 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
2371 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
2373 Changes affecting commentary and documentation
2375 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
2378 Release 2014b - 2014-03-24 21:28:50 -0700
2380 Changes affecting near-future timestamps
2382 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2383 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
2385 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
2386 Bengt-Inge Larsson.) This is currently an approximation; a better version
2387 will require the zic and localtime fixes mentioned below, and the plan is
2388 to wait for a while until at least the zic fixes propagate.
2390 Changes affecting code
2392 'zic' and 'localtime' no longer reject locations needing four transitions
2393 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
2394 Also, 'zic' avoids some unlikely failures due to integer overflow.
2396 Changes affecting build procedure
2398 'make check' now detects Rule lines defined but never used.
2399 The NZAQ rules, an instance of this problem, have been removed.
2401 Changes affecting commentary and documentation
2403 Fix Tuesday/Thursday typo in description of time in Israel.
2404 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2406 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
2407 to Donald MacQueen.) Instead, the Microsoft Windows Store app
2408 library supports them.
2410 Add comments about Johnston Island time in the 1960s.
2411 (Thanks to Lyle McElhaney.)
2413 Morocco's 2014 DST start will be as predicted.
2414 (Thanks to Sebastien Willemijns.)
2417 Release 2014a - 2014-03-07 23:30:29 -0800
2419 Changes affecting near-future timestamps
2421 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
2422 the heads-up, and to Tim Parenti for simplifying the update.)
2424 Changes affecting past timestamps
2426 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2427 (Thanks to Steffen Thorsen.)
2429 Ukraine switched from Moscow to Eastern European time on 1990-07-01
2430 (not 1992-01-01), and observed DST during the entire next winter.
2431 (Thanks to Vladimir in Moscow via Alois Treindl.)
2433 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2434 (Thanks to Avigdor Finkelstein.)
2436 Changes affecting code
2438 A uninitialized-storage bug in 'localtime' has been fixed.
2439 (Thanks to Logan Chien.)
2441 Changes affecting the build procedure
2443 The settings for 'make check_web' now default to Ubuntu 13.10.
2445 Changes affecting commentary and documentation
2447 The boundary of the US Pacific time zone is given more accurately.
2448 (Thanks to Alan Mintz.)
2450 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
2452 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
2454 Better descriptions of countries with same time zone history as
2455 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
2457 Several changes affect tz-link.htm, the main web page.
2459 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2462 Mention xCal (Internet RFC 6321) and jCal.
2464 Microsoft has some support for tz database names.
2466 CLDR data formats include both XML and JSON.
2468 Mention Maggiolo's map of solar vs standard time.
2469 (Thanks to Arthur David Olson.)
2471 Mention TZ4Net. (Thanks to Matt Johnson.)
2473 Mention the timezone-olson Haskell package.
2475 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
2477 Remove moribund links to daylight-savings-time.info and to
2478 Simple Timer + Clocks.
2480 Update two links. (Thanks to Oscar van Vlijmen.)
2482 Fix some formatting glitches, e.g., remove random newlines from
2483 abbr elements' title attributes.
2486 Release 2013i - 2013-12-17 07:25:23 -0800
2488 Changes affecting near-future timestamps:
2490 Jordan switches back to standard time at 00:00 on December 20, 2013.
2491 The 2006-2011 transition schedule is planned to resume in 2014.
2492 (Thanks to Steffen Thorsen.)
2494 Changes affecting past timestamps:
2496 In 2004, Cuba began DST on March 28, not April 4.
2497 (Thanks to Steffen Thorsen.)
2499 Changes affecting code
2501 The compile-time flag NOSOLAR has been removed, as nowadays the
2502 benefit of slightly shrinking runtime table size is outweighed by the
2503 cost of disallowing potential future updates that exceed old limits.
2505 Changes affecting documentation and commentary
2507 The files solar87, solar88, and solar89 are no longer distributed.
2508 They were a negative experiment - that is, a demonstration that
2509 tz data can represent solar time only with some difficulty and error.
2510 Their presence in the distribution caused confusion, as Riyadh
2511 civil time was generally not solar time in those years.
2513 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2516 Release 2013h - 2013-10-25 15:32:32 -0700
2518 Changes affecting current and future timestamps:
2520 Libya has switched its UT offset back to +02 without DST, instead
2521 of +01 with DST. (Thanks to Even Scharning.)
2523 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2524 (Thanks to Gwillim Law.)
2526 Changes affecting future timestamps:
2528 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2529 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2530 (Thanks to Steffen Thorsen.)
2532 Add entries for DST transitions in Morocco in the year 2038.
2533 This avoids some year-2038 glitches introduced in 2013g.
2534 (Thanks to Yoshito Umaoka for reporting the problem.)
2536 Changes affecting API
2538 The 'tzselect' command no longer requires the 'select' command,
2539 and should now work with /bin/sh on more platforms. It also works
2540 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2541 Patrick 'P. J.' McDermott and Alan Barrett.)
2543 Changes affecting code
2545 Fix localtime overflow bugs with 32-bit unsigned time_t.
2547 zdump no longer assumes sscanf returns maximal values on overflow.
2549 Changes affecting the build procedure
2551 The builder can specify which programs to use, if any, instead of
2552 'ar' and 'ranlib', and libtz.a is now built locally before being
2553 installed. (Thanks to Michael Forney.)
2555 A dependency typo in the 'zdump' rule has been fixed.
2556 (Thanks to Andrew Paprocki.)
2558 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2559 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2561 'make clean' no longer removes 'leapseconds', since it's
2562 host-independent and is part of the distribution.
2564 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2566 Changes affecting documentation and commentary
2568 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2569 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2571 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2572 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2573 longer maintained) and for old advisories. SOFA now does C.
2575 Release 2013g - 2013-09-30 21:08:26 -0700
2577 Changes affecting current and near-future timestamps
2579 Morocco now observes DST from the last Sunday in March to the last
2580 Sunday in October, not April to September respectively. (Thanks
2581 to Steffen Thorsen.)
2583 Changes affecting 'zic'
2585 'zic' now runs on platforms that lack both hard links and symlinks.
2586 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2587 Also, fix some bugs on platforms that lack hard links but have symlinks.
2589 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2590 to predict the far future, fixing a bug introduced in 2013e.
2592 Changes affecting the build procedure
2594 The 'leapseconds' file is again put into the tzdata tarball.
2595 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2596 Matt Burgess and Ian Abbott.) The timestamps of these and other
2597 dependent files in tarballs are adjusted more consistently.
2599 Changes affecting documentation and commentary
2601 The README file is now part of the data tarball as well as the code.
2602 It now states that files are public domain unless otherwise specified.
2603 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2604 Its details about the 1989 release moved to a place of honor near
2608 Release 2013f - 2013-09-24 23:37:36 -0700
2610 Changes affecting near-future timestamps
2612 Tocantins will very likely not observe DST starting this spring.
2613 (Thanks to Steffen Thorsen.)
2615 Jordan will likely stay at UT +03 indefinitely, and will not fall
2618 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2620 Changes affecting API
2622 The types of the global variables 'timezone' and 'altzone' (if present)
2623 have been changed back to 'long'. This is required for 'timezone'
2624 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2625 These variables were originally 'long' in the tz code, but were
2626 mistakenly changed to 'time_t' in 1987; nobody reported the
2627 incompatibility until now. The difference matters on x32, where
2628 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2630 Changes affecting the build procedure
2632 Avoid long strings in leapseconds.awk to work around a mawk bug.
2633 (Thanks to Cyril Baurand.)
2635 Changes affecting documentation and commentary
2637 New file 'NEWS' that contains release notes like this one.
2639 Paraguay's law does not specify DST transition time; 00:00 is customary.
2640 (Thanks to Waldemar Villamayor-Venialbo.)
2642 Minor capitalization fixes.
2644 Changes affecting version-control only
2646 The experimental GitHub repository now contains annotated and
2647 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2648 Releases are tagged starting with 2012e; earlier releases were
2649 done differently, and tags would either not have a simple name or
2650 not exactly match what was released.
2652 'make set-timestamps' is now simpler and a bit more portable.
2655 Release 2013e - 2013-09-19 23:50:04 -0700
2657 Changes affecting near-future timestamps
2659 This year Fiji will start DST on October 27, not October 20.
2660 (Thanks to David Wheeler for the heads-up.) For now, guess that
2661 Fiji will continue to spring forward the Sunday before the fourth
2664 Changes affecting current and future time zone abbreviations
2666 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2667 time zone abbreviations since 1932. (Thanks to George Ziegler,
2668 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2669 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2670 Asia/Makassar, and Asia/Pontianak.
2672 Use ART (UT -03, standard time), rather than WARST (also -03, but
2673 daylight saving time) for San Luis, Argentina since 2009.
2675 Changes affecting Godthåb timestamps after 2037 if version mismatch
2677 Allow POSIX-like TZ strings where the transition time's hour can
2678 range from -167 through 167, instead of the POSIX-required 0
2679 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2680 new Fiji rules. This is a more-compact way to represent
2681 far-future timestamps for America/Godthab, America/Santiago,
2682 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2683 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2684 this change. (Derived from a suggestion by Arthur David Olson.)
2686 Allow POSIX-like TZ strings where daylight saving time is in
2687 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2688 Argentina Summer Time all year. This supports a more-compact way
2689 to represent the 2013d data for America/Argentina/San_Luis.
2690 Because of the change for San Luis noted above this change does not
2691 affect the current data. (Thanks to Andrew Main (Zefram) for
2692 suggestions that improved this change.)
2694 Where these two TZ changes take effect, there is a minor extension
2695 to the tz file format in that it allows new values for the
2696 embedded TZ-format string, and the tz file format version number
2697 has therefore been increased from 2 to 3 as a precaution.
2698 Version-2-based client code should continue to work as before for
2699 all timestamps before 2038. Existing version-2-based client code
2700 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2701 files, and typically works in practice even for timestamps after
2702 2037; the only known exception is America/Godthab.
2704 Changes affecting timestamps before 1970
2706 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2707 some errors before 1947.
2709 Some zones have been turned into links, when they differ from existing
2710 zones only in older data entries that were likely invented or that
2711 differ only in LMT or transitions from LMT. These changes affect
2712 only timestamps before 1943. The affected zones are:
2713 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2714 America/Grenada, America/Guadeloupe, America/Marigot,
2715 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2716 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2717 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2718 confirming that the old Europe/Vaduz zone was wrong and the new
2719 link is better for WWII-era times.)
2721 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2722 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2725 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2726 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2729 Change the date of the circa-1850 Zurich transition from 1849-09-12
2730 to 1853-07-16, overriding Shanks with data from Messerli about
2731 postal and telegraph time in Switzerland.
2733 Changes affecting time zone abbreviations before 1970
2735 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2736 as Jakarta was called Batavia back then.
2738 Changes affecting API
2740 The 'zic' command now outputs a dummy transition when far-future
2741 data can't be summarized using a TZ string, and uses a 402-year
2742 window rather than a 400-year window. For the current data, this
2743 affects only the Asia/Tehran file. It does not affect any of the
2744 timestamps that this file represents, so zdump outputs the same
2745 information as before. (Thanks to Andrew Main (Zefram).)
2747 The 'date' command has a new '-r' option, which lets you specify
2748 the integer time to display, a la FreeBSD.
2750 The 'tzselect' command has two new options '-c' and '-n', which lets you
2751 select a zone based on latitude and longitude.
2753 The 'zic' command's '-v' option now warns about constructs that
2754 require the new version-3 binary file format. (Thanks to Arthur
2755 David Olson for the suggestion.)
2757 Support for floating-point time_t has been removed.
2758 It was always dicey, and POSIX no longer requires it.
2759 (Thanks to Eric Blake for suggesting to the POSIX committee to
2760 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2761 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2762 bugs and elucidating some of the corners of the old floating-point
2765 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2766 changed back to the old practice of using 'long' to represent UT
2767 offsets. This had been inadvertently and mistakenly changed to
2768 'int_fast32_t'. (Thanks to Christos Zoulas.)
2770 The code avoids undefined behavior on integer overflow in some
2771 more places, including gmtime, localtime, mktime and zdump.
2773 Changes affecting the zdump utility
2775 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2776 "UTC" does not make sense for timestamps that predate the introduction
2777 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2778 for clarifying UT vs UTC.)
2780 Data changes affecting behavior of tzselect and similar programs
2782 Country code BQ is now called the more-common name "Caribbean Netherlands"
2783 rather than the more-official "Bonaire, St Eustatius & Saba".
2785 Remove from zone.tab the names America/Montreal, America/Shiprock,
2786 and Antarctica/South_Pole, as they are equivalent to existing
2787 same-country-code zones for post-1970 timestamps. The data entries for
2788 these names are unchanged, so the names continue to work as before.
2790 Changes affecting code internals
2792 zic -c now runs way faster on 64-bit hosts when given large numbers.
2794 zic now uses vfprintf to avoid allocating and freeing some memory.
2796 tzselect now computes the list of continents from the data,
2797 rather than have it hard-coded.
2799 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2801 Changes affecting the build procedure
2803 The 'leapseconds' file is now generated automatically from a
2804 new file 'leap-seconds.list', which is a copy of
2805 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2806 A new source file 'leapseconds.awk' implements this.
2807 The goal is simplification of the future maintenance of 'leapseconds'.
2809 When building the 'posix' or 'right' subdirectories, if the
2810 subdirectory would be a copy of the default subdirectory, it is
2811 now made a symbolic link if that is supported. This saves about
2812 2 MB of file system space.
2814 The links America/Shiprock and Antarctica/South_Pole have been
2815 moved to the 'backward' file. This affects only nondefault builds
2816 that omit 'backward'.
2818 Changes affecting version-control only
2820 .gitignore now ignores 'date'.
2822 Changes affecting documentation and commentary
2824 Changes to the 'tzfile' man page
2826 It now mentions that the binary file format may be extended in
2827 future versions by appending data.
2829 It now refers to the 'zdump' and 'zic' man pages.
2831 Changes to the 'zic' man page
2833 It lists conditions that elicit a warning with '-v'.
2835 It says that the behavior is unspecified when duplicate names
2836 are given, or if the source of one link is the target of another.
2838 Its examples are updated to match the latest data.
2840 The definition of white space has been clarified slightly.
2841 (Thanks to Michael Deckers.)
2843 Changes to the 'Theory' file
2845 There is a new section about the accuracy of the tz database,
2846 describing the many ways that errors can creep in, and
2847 explaining why so many of the pre-1970 timestamps are wrong or
2848 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2849 Wollman for discussions that contributed to this).
2851 The 'Theory' file describes LMT better (this follows a
2852 suggestion by Guy Harris).
2854 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2856 It's mentioned that excluding 'backward' should not affect the
2857 other data, and it suggests at least one zone.tab name per
2858 inhabited country (thanks to Stephen Colebourne).
2860 Some longstanding restrictions on names are documented, e.g.,
2861 'America/New_York' precludes 'America/New_York/Bronx'.
2863 It gives more reasons for the 1970 cutoff.
2865 It now mentions which time_t variants are supported, such as
2866 signed integer time_t. (Thanks to Paul Goyette for reporting
2867 typos in an experimental version of this change.)
2869 (Thanks to Philip Newton for correcting typos in these changes.)
2871 Documentation and commentary is more careful to distinguish UT in
2872 general from UTC in particular. (Thanks to Steve Allen.)
2874 Add a better source for the Zurich 1894 transition.
2875 (Thanks to Pierre-Yves Berger.)
2877 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2880 Release 2013d - 2013-07-05 07:38:01 -0700
2882 Changes affecting future timestamps:
2884 Morocco's midsummer transitions this year are July 7 and August 10,
2885 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2887 Israel now falls back on the last Sunday of October.
2888 (Thanks to Ephraim Silverberg.)
2890 Changes affecting past timestamps:
2892 Specify Jerusalem's location more precisely; this changes the pre-1880
2895 Changing affecting metadata only:
2897 Fix typos in the entries for country codes BQ and SX.
2899 Changes affecting code:
2901 Rework the code to fix a bug with handling Australia/Macquarie on
2902 32-bit hosts (thanks to Arthur David Olson).
2904 Port to platforms like NetBSD, where time_t can be wider than long.
2906 Add support for testing time_t types other than the system's.
2907 Run 'make check_time_t_alternatives' to try this out.
2908 Currently, the tests fail for unsigned time_t;
2909 this should get fixed at some point.
2911 Changes affecting documentation and commentary:
2913 Deemphasize the significance of national borders.
2915 Update the zdump man page.
2917 Remove obsolete NOID comment (thanks to Denis Excoffier).
2919 Update several URLs and comments in the web pages.
2921 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2923 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2926 Release 2013c - 2013-04-19 16:17:40 -0700
2928 Changes affecting current and future timestamps:
2930 Palestine observed DST starting March 29, 2013. (Thanks to
2931 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2932 with the predicted rules being the last Thursday in March at 24:00
2933 to the first Friday on or after September 21 at 01:00.
2935 Assume that the recent change to Paraguay's DST rules is permanent,
2936 by moving the end of DST to the 4th Sunday in March every year.
2937 (Thanks to Carlos Raúl Perasso.)
2939 Changes affecting past timestamps:
2941 Fix some historical data for Palestine to agree with that of
2942 timeanddate.com, as follows:
2944 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2947 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2950 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2952 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2954 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2956 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2958 Fix times of habitation for Macquarie to agree with the Tasmania
2959 Parks & Wildlife Service history, which indicates that permanent
2960 habitation was 1899-1919 and 1948 on.
2962 Changing affecting metadata only:
2964 Macquarie Island is politically part of Australia, not Antarctica.
2965 (Thanks to Tobias Conradi.)
2967 Sort Macquarie more-consistently with other parts of Australia.
2968 (Thanks to Tim Parenti.)
2971 Release 2013b - 2013-03-10 22:33:40 -0700
2973 Changes affecting current and future timestamps:
2975 Haiti uses US daylight-saving rules this year, and presumably future years.
2976 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2978 Paraguay will end DST on March 24 this year.
2979 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2981 Morocco does not observe DST during Ramadan;
2982 try to predict Ramadan in Morocco as best we can.
2983 (Thanks to Erik Homoet for the heads-up.)
2985 Changes affecting commentary:
2987 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2988 Update URL for Solaris. Mention Internet RFC 6557.
2989 Update Internet RFCs 2445->5545, 2822->5322.
2990 Switch from FTP to HTTP for Internet RFCs.
2993 Release 2013a - 2013-02-27 09:20:35 -0800
2995 Change affecting binary data format:
2997 The zone offset at the end of version-2-format zone files is now
2998 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
3000 Changes affecting current and future timestamps:
3002 Chile's 2013 rules, and we guess rules for 2014 and later, will be
3003 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
3004 (Thanks to Steffen Thorsen and Robert Elz.)
3006 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
3007 (Thanks to Tobias Conradi and Arthur David Olson.)
3009 Many changes affect historical timestamps before 1940.
3010 These were deduced from: Milne J. Civil time. Geogr J. 1899
3011 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
3013 Changes affecting the code:
3015 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
3016 the data). (Thanks to Arthur David Olson.)
3018 Fix localtime bug when time_t is unsigned and data files were generated
3019 by a signed time_t system. (Thanks to Doug Bailey for reporting and
3020 to Arthur David Olson for fixing.)
3022 Allow the email address for bug reports to be set by the packager.
3023 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
3025 Update HTML checking to be compatible with Ubuntu 12.10.
3027 Check that files are a safe subset of ASCII. At some point we may
3028 relax this requirement to a safe subset of UTF-8. Without the
3029 check, some non-UTF-8 encodings were leaking into the distribution.
3033 Restore a comment about copyright notices that was inadvertently deleted.
3034 (Thanks to Arthur David Olson.)
3036 Improve the commentary about which districts observe what times
3037 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
3039 Add web page links to tz.js.
3041 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
3044 Release 2012j - 2012-11-12 18:34:49 -0800
3046 Libya moved to CET this weekend, but with DST planned next year.
3047 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
3049 Signatures now have the extension .asc, not .sign, as that's more
3050 standard. (Thanks to Phil Pennock.)
3052 The output of 'zdump --version', and of 'zic --version', now
3053 uses a format that is more typical for --version.
3054 (Thanks to Joseph S. Myers.)
3056 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
3057 now uses tz@iana.org rather than the old elsie address.
3059 zic -v now complains about abbreviations that are less than 3
3060 or more than 6 characters, as per Posix. Formerly, it checked
3061 for abbreviations that were more than 3.
3063 'make public' no longer puts its temporary directory under /tmp,
3064 and uses the just-built zic rather than the system zic.
3066 Various fixes to documentation and commentary.
3069 Release 2012i - 2012-11-03 12:57:09 -0700
3071 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
3073 Linker flags can now be specified via LDFLAGS.
3074 AWK now defaults to 'awk', not 'nawk'.
3075 The shell in tzselect now defaults to /bin/bash, but this can
3076 be overridden by specifying KSHELL.
3077 The main web page now mentions the unofficial GitHub repository.
3078 (Thanks to Mike Frysinger.)
3080 Tarball signatures can now be built by running 'make signatures'.
3081 There are also new makefile rules 'tarballs', 'check_public', and
3082 separate makefile rules for each tarball and signature file.
3083 A few makefile rules are now more portable to strict POSIX.
3085 The main web page now lists the canonical IANA URL.
3088 Release 2012h - 2012-10-26 22:49:10 -0700
3090 Bahia no longer has DST. (Thanks to Kelley Cook.)
3092 Tocantins has DST. (Thanks to Rodrigo Severo.)
3094 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
3096 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
3100 More C modernization, except that at Arthur David Olson's suggestion
3101 the instances of 'register' were kept.
3104 Release 2012g - 2012-10-17 20:59:45 -0700
3106 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
3108 Palestine fall 2012. (Thanks to Steffen Thorsen.)
3112 To attack the version-number problem, this release ships the file
3113 'Makefile' (which contains the release number) in both the tzcode and
3114 the tzdata tarballs. The two Makefiles are identical, and should be
3115 identical in any matching pair of tarballs, so it shouldn't matter
3116 which order you extract the tarballs. Perhaps we can come up with a
3117 better version-number scheme at some point; this scheme does have the
3118 virtue of not adding more files.
3121 Release 2012f - 2012-09-12 23:17:03 -0700
3123 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
3124 20 this year. (Thanks to Steffen Thorsen.)
3127 Release 2012e - 2012-08-02 20:44:55 -0700
3129 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
3130 (Thanks to Steffen Thorsen.)
3132 * Use a single version number for both code and data.
3134 * .gitignore: New file.
3136 * Remove trailing white space.
3139 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
3141 Changes for Morocco's timestamps, which take effect in a couple of
3142 hours, along with infrastructure changes to accommodate how the tz
3143 code and data are released on IANA.
3146 Release data2012c - 2012-03-27 12:17:25 -0400
3149 Summer time changes for Morocco (to start late April 2012)
3152 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
3155 Haiti following US/Canada rules for 2012 (and we're assuming,
3156 for now anyway, for the future).
3159 Release 2012b - 2012-03-02 12:29:15 +0700
3161 There is just one change to tzcode2012b (compared with 2012a):
3162 the Makefile that was accidentally included with 2012a has been
3163 replaced with the version that should have been there, which is
3164 identical with the previous version (from tzcode2011i).
3166 There are just two changes in tzdata2012b compared with 2012a.
3168 Most significantly, summer time in Cuba has been delayed 3 weeks
3169 (now starts April 1 rather than March 11). Since Mar 11 (the old start
3170 date, as listed in 2012a) is just a little over a week away, this
3173 Less importantly, an excess tab in one of the changes in zone.tab
3174 in 2012a has been removed.
3177 Release 2012a - 2012-03-01 18:28:10 +0700
3179 The changes in tzcode2012a (compared to the previous version, 2011i)
3180 are entirely to the README and tz-art.htm and tz-link.htm files, if
3181 none of those concern you, you can ignore the code update. The changes
3182 reflect the changed addresses for the mailing list and the code and
3183 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
3184 has been added to tz-link.htm).
3186 In tzdata2012a (compared to the previous release, which was 2011n)
3187 the major changes are:
3188 Chile 2011/2012 and 2012/2013 summer time date adjustments.
3189 Falkland Islands onto permanent summer time (we're assuming for the
3190 foreseeable future, though 2012 is all we're fairly certain of.)
3191 Armenia has abolished Summer Time.
3192 Tokelau jumped the International Date Line back last December
3193 (just the same as their near neighbour, Samoa).
3194 America/Creston is a new zone for a small area of British Columbia
3195 There will be a leapsecond 2012-06-30 23:59:60 UTC.
3197 Other minor changes are:
3198 Corrections to 1918 Canadian summer time end dates.
3199 Updated URL for UK time zone history (in comments)
3200 A few typos in Le Corre's list of free French place names (comments)
3203 Release data2011n - 2011-10-30 14:57:54 +0700
3205 There are three changes of note - most urgently, Cuba (America/Havana)
3206 has extended summer time by two weeks, now to end on Nov 13, rather than
3207 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
3208 (Europe/Tiraspol) decided not to split from the rest of Moldova after
3209 all, and consequently that zone has been removed (again) and reinstated
3210 in the "backward" file as a link to Europe/Chisinau. And third, the
3211 end date for Fiji's summer time this summer was moved forward from the
3212 earlier planned Feb 26, to Jan 22.
3214 Apart from that, Moldova (MD) returns to a single entry in zone.tab
3215 (and the incorrect syntax that was in the 2011m version of that file
3216 is so fixed - it would have been fixed in a different way had this
3217 change not happened - that's the "missing" sccs version id).
3220 Release data2011m - 2011-10-24 21:42:16 +0700
3222 In particular, the typos in comments in the data (2011-11-17 should have
3223 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
3224 Tim Parenti noted) have been fixed, and the change for Ukraine has been
3225 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
3226 Tim Parenti, and also Denys Gavrysh)
3228 In addition, I added Europe/Tiraspol to zone.tab.
3230 This time, all the files have new version numbers... (including the files
3231 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
3232 version numbers there...)
3235 Release data2011l - 2011-10-10 11:15:43 +0700
3237 There are just 2 changes that cause different generated tzdata files from
3238 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
3239 is included, but commented out. Compared with the diff I sent out last week,
3240 this version also includes attributions for the sources for the changes
3241 (in much the same format as ado used, but the html tags have not been
3242 checked, verified, or used in any way at all, so if there are errors there,
3243 please let me know.)
3246 Release data2011k - 2011-09-20 17:54:03 -0400
3251 Release data2011j - 2011-09-12 09:22:49 -0400
3253 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
3254 Tanzania); there are also two spelling corrections to comments in
3255 the australasia file (with thanks to Christos Zoulas).
3258 Release 2011i - 2011-08-29 05:56:32 -0400
3263 Release data2011h - 2011-06-15 18:41:48 -0400
3265 Russia and Curaçao changes
3268 Release 2011g - 2011-04-25 09:07:22 -0400
3270 update the rules for Egypt to reflect its abandonment of DST this year
3273 Release 2011f - 2011-04-06 17:14:53 -0400
3278 Release 2011e - 2011-03-31 16:04:38 -0400
3280 Morocco, Chile, and tz-link changes
3283 Release 2011d - 2011-03-14 09:18:01 -0400
3285 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
3288 Release 2011c - 2011-03-07 09:30:09 -0500
3290 These do affect current timestamps in Chile and Annette Island, Canada.
3293 Release 2011b - 2011-02-07 08:44:50 -0500
3298 Release 2011a - 2011-01-24 10:30:16 -0500
3303 Release data2010o - 2010-11-01 09:18:23 -0400
3305 change to the end of DST in Fiji in 2011
3308 Release 2010n - 2010-10-25 08:19:17 -0400
3313 Release 2010m - 2010-09-27 09:24:48 -0400
3315 Hong Kong, Vostok, and zic.c changes
3318 Release 2010l - 2010-08-16 06:57:25 -0400
3323 Release 2010k - 2010-07-26 10:42:27 -0400
3328 Release 2010j - 2010-05-10 09:07:48 -0400
3330 changes for Bahía de Banderas and for version naming
3333 Release data2010i - 2010-04-16 18:50:45 -0400
3335 the end of DST in Morocco on 2010-08-08
3338 Release data2010h - 2010-04-05 09:58:56 -0400
3343 Release data2010g - 2010-03-24 11:14:53 -0400
3348 Release 2010f - 2010-03-22 09:45:46 -0400
3353 Release data2010e - 2010-03-08 14:24:27 -0500
3355 corrects the Dhaka bug found by Danvin Ruangchan
3358 Release data2010d - 2010-03-06 07:26:01 -0500
3363 Release 2010c - 2010-03-01 09:20:58 -0500
3365 changes including KRE's suggestion for earlier initialization of
3366 "goahead" and "goback" structure elements
3369 Release code2010a - 2010-02-16 10:40:04 -0500
3374 Release data2010b - 2010-01-20 12:37:01 -0500
3379 Release data2010a - 2010-01-18 08:30:04 -0500
3384 Release data2009u - 2009-12-26 08:32:28 -0500
3386 changes to DST in Bangladesh
3389 Release 2009t - 2009-12-21 13:24:27 -0500
3394 Release data2009s - 2009-11-14 10:26:32 -0500
3396 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3399 Release 2009r - 2009-11-09 10:10:31 -0500
3401 "antarctica" and "tz-link.htm" changes
3404 Release 2009q - 2009-11-02 09:12:40 -0500
3406 with two corrections as reported by Eric Muller and Philip Newton
3409 Release data2009p - 2009-10-23 15:05:27 -0400
3411 Argentina (including San Luis) changes (with the correction from
3415 Release data2009o - 2009-10-14 16:49:38 -0400
3417 Samoa (commentary only), Pakistan, and Bangladesh changes
3420 Release data2009n - 2009-09-22 15:13:38 -0400
3422 added commentary for Argentina and a change to the end of DST in
3426 Release data2009m - 2009-09-03 10:23:43 -0400
3428 Samoa and Palestine changes
3431 Release data2009l - 2009-08-14 09:13:07 -0400
3433 Samoa (comments only) and Egypt
3436 Release 2009k - 2009-07-20 09:46:08 -0400
3441 Release data2009j - 2009-06-15 06:43:59 -0400
3443 Bangladesh change (with a short turnaround since the DST change is
3447 Release 2009i - 2009-06-08 09:21:22 -0400
3449 updating for DST in Bangladesh this year
3452 Release 2009h - 2009-05-26 09:19:14 -0400
3457 Release data2009g - 2009-04-20 16:34:07 -0400
3462 Release data2009f - 2009-04-10 11:00:52 -0400
3464 correct DST in Pakistan
3467 Release 2009e - 2009-04-06 09:08:11 -0400
3472 Release 2009d - 2009-03-23 09:38:12 -0400
3474 Morocco, Tunisia, Argentina, and American Astronomical Society changes
3477 Release data2009c - 2009-03-16 09:47:51 -0400
3479 change to the start of Cuban DST
3482 Release 2009b - 2009-02-09 11:15:22 -0500
3487 Release 2009a - 2009-01-21 10:09:39 -0500
3492 Release data2008i - 2008-10-21 12:10:25 -0400
3494 southamerica and zone.tab files, with Argentina DST rule changes and
3495 United States zone reordering and recommenting
3498 Release 2008h - 2008-10-13 07:33:56 -0400
3503 Release 2008g - 2008-10-06 09:03:18 -0400
3505 Fix a broken HTML anchor and update Brazil's DST transitions;
3506 there's also a slight reordering of information in tz-art.htm.
3509 Release data2008f - 2008-09-09 22:33:26 -0400
3514 Release 2008e - 2008-07-28 14:11:17 -0400
3516 changes by Arthur David Olson and Jesper Nørgaard Welen
3519 Release data2008d - 2008-07-07 09:51:38 -0400
3521 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3524 Release data2008c - 2008-05-19 17:48:03 -0400
3526 Pakistan, Morocco, and Mongolia
3529 Release data2008b - 2008-03-24 08:30:59 -0400
3531 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3535 Release 2008a - 2008-03-08 05:42:16 -0500
3540 Release 2007k - 2007-12-31 10:25:22 -0500
3542 most importantly, changes to the "southamerica" file based on
3543 Argentina's readoption of daylight saving time
3546 Release 2007j - 2007-12-03 09:51:01 -0500
3548 1. eliminate the "P" (parameter) macro;
3550 2. the "noncontroversial" changes circulated on the time zone
3551 mailing list (less the changes to "logwtmp.c");
3553 3. eliminate "too many transition" errors when "min" is used in time
3556 4. changes by Paul Eggert (including updated information for Venezuela).
3559 Release data2007i - 2007-10-30 10:28:11 -0400
3561 changes for Cuba and Syria
3564 Release 2007h - 2007-10-01 10:05:51 -0400
3566 changes by Paul Eggert, as well as an updated link to the ICU
3567 project in tz-link.htm
3570 Release 2007g - 2007-08-20 10:47:59 -0400
3572 changes by Paul Eggert
3574 The "leapseconds" file has been updated to incorporate the most
3575 recent International Earth Rotation and Reference Systems Service
3578 There's an addition to tz-art.htm regarding the television show "Medium".
3581 Release 2007f - 2007-05-07 10:46:46 -0400
3583 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3586 changes to zic.c to allow hour values greater than 24 (along with
3587 Paul's improved time value overflow checking)
3590 Release 2007e - 2007-04-02 10:11:52 -0400
3592 Syria and Honduras changes by Paul Eggert
3594 zic.c variable renaming changes by Arthur David Olson
3597 Release 2007d - 2007-03-20 08:48:30 -0400
3599 changes by Paul Eggert
3601 the elimination of white space at the ends of lines
3604 Release 2007c - 2007-02-26 09:09:37 -0500
3606 changes by Paul Eggert
3609 Release 2007b - 2007-02-12 09:34:20 -0500
3611 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3613 changes to the commentary in "leapseconds" reflecting the IERS
3614 announcement that there is to be no positive leap second at the end
3618 Release 2007a - 2007-01-08 12:28:29 -0500
3620 changes by Paul Eggert
3622 Derick Rethan's Asmara change
3624 Oscar van Vlijmen's Easter Island local mean time change
3626 symbolic link changes
3629 Release 2006p - 2006-11-27 08:54:27 -0500
3631 changes by Paul Eggert
3634 Release 2006o - 2006-11-06 09:18:07 -0500
3636 changes by Paul Eggert
3639 Release 2006n - 2006-10-10 11:32:06 -0400
3641 changes by Paul Eggert
3644 Release 2006m - 2006-10-02 15:32:35 -0400
3646 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3648 (minimalist) changes to zic.8 to clarify "until" information
3651 Release data2006l - 2006-09-18 12:58:11 -0400
3653 Paul's best-effort work on this coming weekend's Egypt time change
3656 Release 2006k - 2006-08-28 12:19:09 -0400
3658 changes by Paul Eggert
3661 Release 2006j - 2006-08-21 09:56:32 -0400
3663 changes by Paul Eggert
3666 Release code2006i - 2006-08-07 12:30:55 -0400
3670 Ken Pizzini's conversion script
3673 Release code2006h - 2006-07-24 09:19:37 -0400
3675 adds public domain notices to four files
3677 includes a fix for transition times being off by a second
3679 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3682 Release 2006g - 2006-05-08 17:18:09 -0400
3684 northamerica changes by Paul Eggert
3687 Release 2006f - 2006-05-01 11:46:00 -0400
3689 a missing version number problem is fixed (with thanks to Bradley
3690 White for catching the problem)
3693 Release 2006d - 2006-04-17 14:33:43 -0400
3695 changes by Paul Eggert
3697 added new items to tz-arts.htm that were found by Paul
3700 Release 2006c - 2006-04-03 10:09:32 -0400
3702 two sets of data changes by Paul Eggert
3704 a fencepost error fix in zic.c
3706 changes to zic.c and the "europe" file to minimize differences
3707 between output produced by the old 32-bit zic and the new 64-bit
3711 Release 2006b - 2006-02-20 10:08:18 -0500
3712 [tz32code2006b + tz64code2006b + tzdata2006b]
3716 All SCCS IDs were bumped to "8.1" for this release.
3719 Release 2006a - 2006-01-30 08:59:31 -0500
3721 changes by Paul Eggert (in particular, Indiana time zone moves)
3723 an addition to the zic manual page to describe how special-case
3724 transitions are handled
3727 Release 2005r - 2005-12-27 09:27:13 -0500
3729 Canadian changes by Paul Eggert
3731 They also add "<pre>" directives to time zone data files and reflect
3732 changes to warning message logic in "zdump.c" (but with calls to
3733 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3736 Release 2005q - 2005-12-13 09:17:09 -0500
3738 Nothing earth-shaking here:
3739 1. Electronic mail addresses have been removed.
3740 2. Casts of the return value of exit have been removed.
3741 3. Casts of the argument of is.* macros have been added.
3742 4. Indentation in one section of zic.c has been fixed.
3743 5. References to dead URLs in the data files have been dealt with.
3746 Release 2005p - 2005-12-05 10:30:53 -0500
3748 "systemv", "tz-link.htm", and "zdump.c" changes
3749 (less the casts of arguments to the is* macros)
3752 Release 2005o - 2005-11-28 10:55:26 -0500
3754 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3756 zdump.c lint fixes by Arthur David Olson
3759 Release 2005n - 2005-10-03 09:44:09 -0400
3761 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3765 Release 2005m - 2005-08-29 12:15:40 -0400
3767 changes by Paul Eggert (with a small tweak to the tz-art change)
3769 a declaration of an unused variable has been removed from zdump.c
3772 Release 2005l - 2005-08-22 12:06:39 -0400
3774 changes by Paul Eggert
3776 overflow/underflow checks by Arthur David Olson, minus changes to
3777 the "Theory" file about the pending addition of 64-bit data (I grow
3778 less confident of the changes being accepted with each passing day,
3779 and the changes no longer increase the data files nine-fold--there's
3780 less than a doubling in size by my local Sun's reckoning)
3783 Release 2005k - 2005-07-14 14:14:24 -0400
3785 The "leapseconds" file has been edited to reflect the recently
3786 announced leap second at the end of 2005.
3788 I've also deleted electronic mail addresses from the files as an
3792 Release 2005j - 2005-06-13 14:34:13 -0400
3794 These reflect changes to limit the length of time zone abbreviations
3795 and the characters used in those abbreviations.
3797 There are also changes to handle POSIX-style "quoted" timezone
3798 environment variables.
3800 The changes were circulated on the time zone mailing list; the only
3801 change since then was the removal of a couple of minimum-length of
3802 abbreviation checks.
3805 Release data2005i - 2005-04-21 15:04:16 -0400
3807 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3810 Release 2005h - 2005-04-04 11:24:47 -0400
3812 changes by Paul Eggert
3814 minor changes to Makefile and zdump.c to produce more useful output
3815 when doing a "make typecheck"
3818 Release 2005g - 2005-03-14 10:11:21 -0500
3820 changes by Paul Eggert (a change to current DST rules in Uruguay and
3821 an update to a link to time zone software)
3824 Release 2005f - 2005-03-01 08:45:32 -0500
3826 data and documentation changes by Paul Eggert
3829 Release 2005e - 2005-02-10 15:59:44 -0500
3834 Release code2005d - 2005-01-31 09:21:47 -0500
3836 make zic complain about links to links if the -v flag is used
3838 have "make public" do more code checking
3840 add an include to "localtime.c" for the benefit of gcc systems
3843 Release 2005c - 2005-01-17 18:36:29 -0500
3845 get better results when mktime runs on a system where time_t is double
3847 changes to the data files (most importantly to Paraguay)
3850 Release 2005b - 2005-01-10 09:19:54 -0500
3852 Get localtime and gmtime working on systems with exotic time_t types.
3854 Update the leap second commentary in the "leapseconds" file.
3857 Release 2005a - 2005-01-01 13:13:44 -0500
3862 Release code2004i - 2004-12-14 13:42:58 -0500
3864 Deal with systems where time_t is unsigned.
3867 Release code2004h - 2004-12-07 11:40:18 -0500
3869 64-bit-time_t changes
3872 Release 2004g - 2004-11-02 09:06:01 -0500
3874 update to Cuba (taking effect this weekend)
3876 other changes by Paul Eggert
3878 correction of the spelling of Oslo
3880 changed versions of difftime.c and private.h
3883 Release code2004f - 2004-10-21 10:25:22 -0400
3885 Cope with wide-ranging tm_year values.
3888 Release 2004e - 2004-10-11 14:47:21 -0400
3890 Brazil/Argentina/Israel changes by Paul Eggert
3892 changes to tz-link.htm by Paul
3894 one small fix to Makefile
3897 Release 2004d - 2004-09-22 08:27:29 -0400
3899 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3902 Release 2004c - 2004-08-11 12:06:26 -0400
3904 asctime-related changes
3906 (variants of) some of the documentation changes suggested by Paul Eggert
3909 Release 2004b - 2004-07-19 14:33:35 -0400
3911 data changes by Paul Eggert - most importantly, updates for Argentina
3914 Release 2004a - 2004-05-27 12:00:47 -0400
3916 changes by Paul Eggert
3918 Handle DST transitions that occur at the end of a month in some
3919 years but at the start of the following month in other years.
3921 Add a copy of the correspondence that's the basis for claims about
3922 DST in the Navajo Nation.
3925 Release 2003e - 2003-12-15 09:36:47 -0500
3927 changes by Arthur David Olson (primarily code changes)
3929 changes by Paul Eggert (primarily data changes)
3931 minor changes to "Makefile" and "northamerica" (in the latter case,
3932 optimization of the "Toronto" rules)
3935 Release 2003d - 2003-10-06 09:34:44 -0400
3937 changes by Paul Eggert
3940 Release 2003c - 2003-09-16 10:47:05 -0400
3942 Fix bad returns in zic.c's inleap function.
3943 Thanks to Bradley White for catching the problem!
3946 Release 2003b - 2003-09-16 07:13:44 -0400
3948 Add a "--version" option (and documentation) to the zic and zdump commands.
3950 changes to overflow/underflow checking in zic
3952 a localtime typo fix.
3954 Update the leapseconds and tz-art.htm files.
3957 Release 2003a - 2003-03-24 09:30:54 -0500
3959 changes by Paul Eggert
3961 a few additions and modifications to the tz-art.htm file
3964 Release 2002d - 2002-10-15 13:12:42 -0400
3966 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3968 There's also a new time zone quote in "tz-art.htm".
3971 Release 2002c - 2002-04-04 11:55:20 -0500
3973 changes by Paul Eggert
3975 Change zic.c to avoid creating symlinks to files that don't exist.
3978 Release 2002b - 2002-01-28 12:56:03 -0500
3980 [These change notes are for Release 2002a, which was corrupted.
3981 2002b was a corrected version of 2002a.]
3983 changes by Paul Eggert
3985 Update the "leapseconds" file to note that there'll be no leap
3986 second at the end of June, 2002.
3988 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3990 Change to "difftime.c" to avoid sizeof problems.
3993 Release 2001d - 2001-10-09 13:31:32 -0400
3995 changes by Paul Eggert
3998 Release 2001c - 2001-06-05 13:59:55 -0400
4000 changes by Paul Eggert and Andrew Brown
4003 Release 2001b - 2001-04-05 16:44:38 -0400
4005 changes by Paul Eggert (modulo jnorgard's typo fix)
4007 tz-art.htm has been HTMLified.
4010 Release 2001a - 2001-03-13 12:57:44 -0500
4012 changes by Paul Eggert
4014 An addition to the "leapseconds" file: comments with the text of the
4015 latest IERS leap second notice.
4017 Trailing white space has been removed from data file lines, and
4018 repeated spaces in "Rule Jordan" lines in the "asia" file have been
4022 Release 2000h - 2000-12-14 15:33:38 -0500
4024 changes by Paul Eggert
4026 one typo fix in the "art" file
4028 With providence, this is the last update of the millennium.
4031 Release 2000g - 2000-10-10 11:35:22 -0400
4033 changes by Paul Eggert
4035 correction of John Mackin's name submitted by Robert Elz
4037 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
4038 Emmy Awards broadcast.
4041 Release 2000f - 2000-08-10 09:31:58 -0400
4043 changes by Paul Eggert
4045 Added information in "tz-art.htm" on a Seinfeld reference to DST.
4047 Error checking and messages in the "yearistype" script have been
4051 Release 2000e - 2000-07-31 09:27:54 -0400
4053 data changes by Paul Eggert
4055 a change to the default value of the defined constant HAVE_STRERROR
4057 the addition of a Dave Barry quote on DST to the tz-arts file
4060 Release 2000d - 2000-04-20 15:43:04 -0400
4062 changes to the documentation and code of strftime for C99 conformance
4064 a bug fix for date.c
4066 These are based on (though modified from) changes by Paul Eggert.
4069 Release 2000c - 2000-03-04 10:31:43 -0500
4071 changes by Paul Eggert
4074 Release 2000b - 2000-02-21 12:16:29 -0500
4076 changes by Paul Eggert and Joseph Myers
4078 modest tweaks to the tz-art.htm and tz-link.htm files
4081 Release 2000a - 2000-01-18 09:21:26 -0500
4083 changes by Paul Eggert
4085 The two hypertext documents have also been renamed.
4088 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
4090 Paul Eggert's changes
4092 additions to the "zic" manual page and the "Arts.htm" file
4095 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
4100 Release data1999h - 1999-10-07 03:50:29 -0400
4102 changes by Paul Eggert to "europe" (most importantly, fixing
4103 Lithuania and Estonia)
4106 Release 1999g - 1999-09-28 11:06:18 -0400
4108 data changes by Paul Eggert (most importantly, the change for
4109 Lebanon that buys correctness for this coming Sunday)
4111 The "code" file contains changes to "Makefile" and "checktab.awk" to
4112 allow better checking of time zone files before they are published.
4115 Release 1999f - 1999-09-23 09:48:14 -0400
4117 changes by Arthur David Olson and Paul Eggert
4120 Release 1999e - 1999-08-17 15:20:54 -0400
4122 changes circulated by Paul Eggert, although the change to handling
4123 of DST-specifying timezone names has been commented out for now
4124 (search for "XXX" in "localtime.c" for details). These files also
4125 do not make any changes to the start of DST in Brazil.
4127 In addition to Paul's changes, there are updates to "Arts.htm" and
4131 Release 1999d - 1999-03-30 11:31:07 -0500
4133 changes by Paul Eggert
4135 The Makefile's "make public" rule has also been changed to do a test
4136 compile of each individual time zone data file (which should help
4137 avoid problems such as the one we had with Nicosia).
4140 Release 1999c - 1999-03-25 09:47:47 -0500
4142 changes by Paul Eggert, most importantly the change for Chile.
4145 Release 1999b - 1999-02-01 17:51:44 -0500
4147 changes by Paul Eggert
4149 code changes (suggested by Mani Varadarajan, mani at be.com) for
4150 correct handling of symbolic links when building using a relative directory
4152 code changes to generate correct messages for failed links
4154 updates to the URLs in Arts.htm
4157 Release 1999a - 1999-01-19 16:20:29 -0500
4159 error message internationalizations and corrections in zic.c and
4160 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
4164 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
4166 changes for Brazil, Chile, and Germany
4168 support for use of "24:00" in the input files for the time zone compiler
4171 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
4173 changes by Paul Eggert
4175 correction to a define in the "private.h" file
4178 Release data1998g - 1998-08-11 03:28:35 -0000
4179 [tzdata1998g.tar.gz is missing!]
4181 Lithuanian change provided by mgedmin at pub.osf.it
4183 Move creation of the GMT link with Etc/GMT to "etcetera" (from
4184 "backward") to ensure that the GMT file is created even where folks
4185 don't want the "backward" links (as suggested by Paul Eggert).
4188 Release data1998f - 1998-07-20 13:50:00 -0000
4189 [tzdata1998f.tar.gz is missing!]
4191 Update the "leapseconds" file to include the newly-announced
4192 insertion at the end of 1998.
4195 Release code1998f - 1998-06-01 10:18:31 -0400
4197 addition to localtime.c by Guy Harris
4200 Release 1998e - 1998-05-28 09:56:26 -0400
4202 The Makefile is changed to produce zoneinfo-posix rather than
4203 zoneinfo/posix, and to produce zoneinfo-leaps rather than
4206 data changes by Paul Eggert
4208 changes from Guy Harris to provide asctime_r and ctime_r
4210 A usno1998 file (substantially identical to usno1997) has been added.
4213 Release 1998d - 1998-05-14 11:58:34 -0400
4215 changes to comments (in particular, elimination of references to CIA maps).
4216 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
4217 where changes occur.
4220 Release 1998c - 1998-02-28 12:32:26 -0500
4222 changes by Paul Eggert (save the "French correction," on which I'll
4223 wait for the dust to settle)
4227 changes and additions to Arts.htm
4230 Release 1998b - 1998-01-17 14:31:51 -0500
4232 URL cleanups and additions
4235 Release 1998a - 1998-01-13 12:37:35 -0500
4237 changes by Paul Eggert
4240 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
4242 changes by Paul Eggert, with minor modifications from Arthur David
4243 Olson to make the files more browser friendly
4246 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
4248 minor changes to put "TZif" at the start of each timezone information file
4250 a rule has also been added to the Makefile so you can
4252 to just recompile the zone information files (rather than doing a
4253 full "make install" with its other effects).
4256 Release data1997i - 1997-10-07 08:45:38 -0400
4258 changes to Africa by Paul Eggert
4261 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
4263 corrections for Uruguay (and other locations)
4265 Arthur David Olson's simple-minded fix allowing mktime to both
4266 correctly handle leap seconds and correctly handle tm_sec values
4267 upon which arithmetic has been performed.
4270 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
4272 Paul Eggert's updates
4274 a small change to a function prototype;
4276 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
4277 include information on Around the World in Eighty Days.
4280 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
4282 fixes to zic's error handling
4284 changes inspired by the item circulated on Slovenia
4286 The description of Web resources has been HTMLified for browsing
4289 A new piece of tz-related music has been added to the "Music" file.
4292 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
4294 Paul Eggert's latest suggestions
4297 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
4299 changes to "zic.c" to correct performance of the "-s" option
4301 a new file "usno1997"
4304 Release data1997c - 1997-03-04 09:58:18 -0500
4309 Release 1997b - 1997-02-27 18:34:19 -0500
4311 The data file incorporates the 1997 leap second.
4313 The code file incorporates Arthur David Olson's take on the
4314 zic/multiprocessor/directory-creation situation.
4317 Release 1997a - 1997-01-21 09:11:10 -0500
4319 Paul Eggert's Antarctica (and other changes)
4321 Arthur David Olson finessed the "getopt" issue by checking against
4322 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4323 is returned while SunOS 5.5's manual says EOF is returned).
4326 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4328 Paul Eggert's latest changes
4331 Release code1996n - 1996-12-16 09:42:02 -0500
4333 link snapping fix from Bruce Evans (via Garrett Wollman)
4336 Release data1996m - 1996-11-24 02:37:34 -0000
4337 [tzdata1996m.tar.gz is missing!]
4339 Paul Eggert's batch of changes
4342 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4344 No functional changes here; the files have simply been changed to
4345 make more use of ISO style dates in comments. The names of the above
4346 files now include the year in full.
4349 Release code96l - 1996-09-08 17:12:20 -0400
4351 tzcode96k was missing a couple of pieces.
4354 Release 96k - 1996-09-08 16:06:22 -0400
4356 the latest round of changes from Paul Eggert
4358 the recent Year 2000 material
4361 Release code96j - 1996-07-30 13:18:53 -0400
4363 Set sp->typecnt as suggested by Timothy Patrick Murphy.
4366 Release code96i - 1996-07-27 20:11:35 -0400
4368 Paul's suggested patch for strftime %V week numbers
4371 Release data96i - 1996-07-01 18:13:04 -0400
4373 "northamerica" and "europe" changes by Paul Eggert
4376 Release code96h - 1996-06-05 08:02:21 -0400
4378 fix for handling transitions specified in Universal Time
4380 Some "public domain" notices have also been added.
4383 Release code96g - 1996-05-16 14:00:26 -0400
4385 fix for the simultaneous-DST-and-zone-change challenge
4388 Release data96h - 1996-05-09 17:40:51 -0400
4390 changes by Paul Eggert
4393 Release code96f-data96g - 1996-05-03 03:09:59 -0000
4394 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4396 The changes get us some of the way to fixing the problems noted in Paul
4397 Eggert's letter yesterday (in addition to a few others). The approach
4398 has been to make zic a bit smarter about figuring out what time zone
4399 abbreviations apply just after the time specified in the "UNTIL" part
4400 of a zone line. Putting the smarts in zic means avoiding having
4401 transition times show up in both "Zone" lines and "Rule" lines, which
4402 in turn avoids multiple transition time entries in time zone files.
4403 (This also makes the zic input files such as "europe" a bit shorter and
4404 should ease maintenance.)
4407 Release data96f - 1996-04-19 19:20:03 -0000
4408 [tzdata96f.tar.gz is missing!]
4410 The only changes are to the "northamerica" file; the time zone
4411 abbreviation for Denver is corrected to MST (and MDT), and the
4412 comments for Mexico have been updated.
4415 Release data96e - 1996-03-19 17:37:26 -0500
4417 Proposals by Paul Eggert, in particular the Portugal change that
4418 comes into play at the end of this month.
4421 Release data96d - 1996-03-18 20:49:39 -0500
4426 Release code96e - 1996-02-29 15:43:27 -0000
4427 [tzcode96e.tar.gz is missing!]
4429 internationalization changes and the fix to the documentation for strftime
4432 Release code96d-data96c - 1996-02-12 11:05:27 -0500
4434 The "code" file simply updates Bob Kridle's electronic address.
4436 The "data" file updates rules for Mexico.
4439 Release data96b - 1996-01-27 15:44:42 -0500
4444 Release code96c - 1996-01-16 16:58:15 -0500
4446 leap-year streamlining and binary-search changes
4451 Release code96b - 1996-01-10 20:42:39 -0500
4453 fixes and enhancements from Paul Eggert, including code that
4454 emulates the behavior of recent versions of the SunOS "date"
4458 Release 96a - 1996-01-06 09:08:24 -0500
4462 fixes to strftime.c for correct ISO 8601 week number generation,
4463 plus support for two new formats ('G' and 'g') to give ISO 8601 year
4464 numbers (which are not necessarily the same as calendar year numbers)
4467 Release code95i-data95m - 1995-12-21 12:46:47 -0500
4469 The latest revisions from Paul Eggert are included, the usno1995
4470 file has been updated, and a new file ("WWW") covering useful URLs
4474 Release code95h-data95l - 1995-12-19 18:10:12 -0500
4476 A simplification of a macro definition, a change to data for Sudan,
4477 and (for last minute shoppers) notes in the "Music" file on the CD
4481 Release code95g-data95k - 1995-10-30 10:32:47 -0500
4483 (slightly reformatted) 8-bit-clean proposed patch
4485 minor patch: US/Eastern -> America/New_York
4487 snapshot of the USNO's latest data ("usno1995")
4489 some other minor cleanups
4492 Release code95f-data95j - 1995-10-28 21:01:34 -0000
4493 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4497 support for 64-bit time_t's
4499 optimization in localtime.c
4502 Release code95e - 1995-10-13 13:23:57 -0400
4504 the mktime change to scan from future to past when trying to find time zone
4508 Release data95i - 1995-09-26 10:43:26 -0400
4510 For Canada/Central, guess that the Sun customer's "one week too
4511 early" was just a approximation, and the true error is one month
4512 too early. This is consistent with the rest of Canada.
4515 Release data95h - 1995-09-21 11:26:48 -0400
4517 latest changes from Paul Eggert
4520 Release code95d - 1995-09-14 11:14:45 -0400
4522 the addition of a "Music" file, which documents four recorded
4523 versions of the tune "Save That Time".
4526 Release data95g - 1995-09-01 17:21:36 -0400
4528 "yearistype" correction
4531 Release data95f - 1995-08-28 20:46:56 -0400
4533 Paul Eggert's change to the australasia file
4536 Release data95e - 1995-07-08 18:02:34 -0400
4538 The only change is a leap second at the end of this year.
4539 Thanks to Bradley White for forwarding news on the leap second.
4542 Release data95d - 1995-07-03 13:26:22 -0400
4544 Paul Eggert's changes
4547 Release data95c - 1995-07-02 19:19:28 -0400
4549 changes to "asia", "backward", "europe", and "southamerica"
4550 (read: northamericacentrics need not apply)
4553 Release code95c - 1995-03-13 14:00:46 -0500
4555 one-line fix for sign extension problems in detzcode
4558 Release 95b - 1995-03-04 11:22:38 -0500
4560 Minor changes in both:
4562 The "code" file contains a workaround for the lack of "unistd.h" in
4563 Microsoft C++ version 7.
4565 The "data" file contains a fixed "Link" for America/Shiprock.
4568 Release 94h - 1994-12-10 12:51:14 -0500
4572 * incorporate the changes to "zdump" and "date" to make changes to
4573 the "TZ" environment variable permanent;
4575 * incorporate the table changes by Paul Eggert;
4577 * include (and document) support for universal time specifications in
4578 data files - but do not (yet) include use of this feature in the
4581 Think of this as "TZ Classic" - the software has been set up not to break if
4582 universal time shows up in its input, and data entries have been
4583 left as is so as not to break existing implementations.
4586 Release data94f - 1994-08-20 12:56:09 -0400
4588 (with thanks!) the latest data updates from Paul Eggert
4591 Release data94e - 1994-06-04 13:13:53 -0400
4596 Release code94g - 1994-05-05 12:14:07 -0400
4598 fix missing "optind.c" and a reference to it in the Makefile
4601 Release code94f - 1994-05-05 13:00:33 -0000
4602 [tzcode94f.tar.gz is missing!]
4604 changes to avoid overflow in difftime, as well as changes to cope
4605 with the 52/53 challenge in strftime
4608 Release code94e - 1994-03-30 23:32:59 -0500
4610 change for the benefit of PCTS
4613 Release 94d - 1994-02-24 15:42:25 -0500
4615 Avoid clashes with POSIX semantics for zones such as GMT+4.
4617 Some other very minor housekeeping is also present.
4620 Release code94c - 1994-02-10 08:52:40 -0500
4622 Fix bug where mkdirs was broken unless you compile with
4623 -fwritable-strings (which is generally losing to do).
4626 Release 94b - 1994-02-07 10:04:33 -0500
4628 work by Paul Eggert who notes:
4630 I found another book of time zone histories by E W Whitman; it's not
4631 as extensive as Shanks but has a few goodies of its own. I used it
4632 to update the tables. I also fixed some more as a result of
4633 correspondence with Adam David and Peter Ilieve, and move some stray
4634 links from 'europe' to 'backward'. I corrected some scanning errors
4637 As far as the code goes, I fixed zic to allow years in the range
4638 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4639 And I cleaned up the zic documentation a little bit.
4642 Release data94a - 1994-02-03 08:58:54 -0500
4644 It simply incorporates the recently announced leap second into the
4648 Release 93g - 1993-11-22 17:28:27 -0500
4650 Paul Eggert has provided a good deal of historic information (based
4651 on Shanks), and there are some code changes to deal with the buglets
4652 that crawled out in dealing with the new information.
4655 Release 93f - 1993-10-15 12:27:46 -0400
4657 Paul Eggert's changes
4660 Release 93e - 1993-09-05 21:21:44 -0400
4662 This has updated data for Israel, England, and Kwajalein. There's
4663 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4664 Thanks to Paul Eggert and Peter Ilieve for the changes.
4667 Release 93d - 1993-06-17 23:34:17 -0400
4669 new fix and new data on Israel
4672 Release 93c - 1993-06-06 19:31:55 -0400
4677 Release 93b - 1993-02-02 14:53:58 -0500
4679 updated "leapseconds" file
4682 Release 93 - 1993-01-08 07:01:06 -0500
4684 At kre's suggestion, the package has been split in two - a code piece
4685 (which also includes documentation) that's only of use to folks who
4686 want to recompile things and a data piece useful to anyone who can
4689 The new version has a few changes to the data files, a few
4690 portability changes, and an off-by-one fix (with thanks to
4691 Tom Karzes at deshaw.com for providing a description and a
4695 Release 92c - 1992-11-21 17:35:36 -0000
4696 [tz92c.tar.Z is missing!]
4698 The fallout from the latest round of DST transitions.
4700 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4701 there's also a change to "zic.c" that makes it portable to more systems.
4704 Release 92 - 1992-04-25 18:17:03 -0000
4705 [tz92.tar.Z is missing!]
4707 By popular demand (well, at any rate, following a request by kre at munnari)
4710 The 1989 update of the time zone package featured:
4712 * POSIXization (including interpretation of POSIX-style TZ environment
4713 variables, provided by Guy Harris),
4714 * ANSIfication (including versions of "mktime" and "difftime"),
4715 * SVIDulation (an "altzone" variable)
4716 * MACHination (the "gtime" function)
4717 * corrections to some time zone data (including corrections to the rules
4718 for Great Britain and New Zealand)
4719 * reference data from the United States Naval Observatory for folks who
4720 want to do additional time zones
4721 * and the 1989 data for Saudi Arabia.
4723 (Since this code will be treated as "part of the implementation" in some
4724 places and as "part of the application" in others, there's no good way to
4725 name functions, such as timegm, that are not part of the proposed ANSI C
4726 standard; such functions have kept their old, underscore-free names in this
4729 And the "dysize" function has disappeared; it was present to allow
4730 compilation of the "date" command on old BSD systems, and a version of "date"
4731 is now provided in the package. The "date" command is not created when you
4732 "make all" since it may lack options provided by the version distributed with
4733 your operating system, or may not interact with the system in the same way
4734 the native version does.
4736 Since POSIX frowns on correct leap second handling, the default behavior of
4737 the "zic" command (in the absence of a "-L" option) has been changed to omit
4738 leap second information from its output files.
4744 This file contains copies of the part of each release announcement
4745 that talks about the changes in that release. The text has been
4746 adapted and reformatted for the purposes of this file.
4748 Traditionally a release R consists of a pair of tarball files,
4749 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4750 code2010a, data2012c) consist of just one or the other tarball, and a
4751 few (e.g., code2012c-data2012d) have tarballs with mixed version
4752 numbers. Recent releases also come in an experimental format
4753 consisting of a single tarball tzdb-R.tar.lz with extra data.
4755 Release timestamps are taken from the release's commit (for newer,
4756 Git-based releases), from the newest file in the tarball (for older
4757 releases, where this info is available) or from the email announcing
4758 the release (if all else fails; these are marked with a time zone
4759 abbreviation of -0000 and an "is missing!" comment).
4761 Earlier versions of the code and data were not announced on the tz
4762 list and are not summarized here.
4764 This file is in the public domain.