1 News for the tz database
3 Release 2016j - 2016-11-22 23:17:13 -0800
5 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
7 Changes to future time stamps
9 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
10 This hives off a new zone Europe/Saratov from Europe/Volgograd.
11 (Thanks to Yuri Konotopov and Stepan Golosunov.)
13 Changes to past time stamps
15 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
16 Asia/Aqtau except it switched from +04/+05 to +05/+06 in spring
17 1999, not fall 1994. (Thanks to Stepan Golosunov.)
19 Changes to past time zone abbreviations
21 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
22 summer time before 1948. The old use of "EET" was a typo.
26 zic no longer mishandles file systems that lack hard links, fixing
27 bugs introduced in 2016g. (Problems reported by Tom Lane.)
28 Also, when the destination already contains symbolic links, zic
29 should now work better on systems where the 'link' system call
30 does not follow symbolic links.
32 Changes to documentation and commentary
34 tz-link.htm now documents the relationship between release version
35 numbers and development-repository commit tags. (Suggested by
38 The 'Theory' file now documents UT.
40 iso3166.tab now accents "Curaçao", and commentary now mentions
41 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
44 Release 2016i - 2016-11-01 23:19:52 -0700
46 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
47 reintroduces DST on 2016-11-06.
49 Changes to future time stamps
51 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
52 2017-01-15 at 03:00. Assume future observances in Tonga will be
53 from the first Sunday in November through the third Sunday in
54 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
55 time zone abbreviations for this zone.
57 Changes to past and future time stamps
59 Northern Cyprus is now +03 year round, causing a split in Cyprus
60 time zones starting 2016-10-30 at 04:00. This creates a zone
61 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
63 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
64 (Thanks to Steffen Thorsen.)
66 Changes to past time stamps
68 Several corrections were made for pre-1975 time stamps in Italy.
69 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
72 First, the 1893-11-01 00:00 transition in Italy used the new UT
73 offset (+01), not the old (+00:49:56). (Thanks to Michael
76 Second, rules for daylight saving in Italy were changed to agree
77 with Italy's National Institute of Metrological Research (INRiM)
78 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
79 Inglis, and Michael Deckers):
81 The 1916-06-03 transition was at 24:00, not 00:00.
83 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
86 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
89 The 1944-09-17 transition was at 03:00, not 01:00. This
90 particular change is taken from Italian law as INRiM's table,
91 (which says 02:00) appears to have a typo here. Also, keep the
92 1944-04-03 transition for Europe/Rome, as Rome was controlled by
95 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
100 The code should now be buildable on AmigaOS merely by setting the
101 appropriate Makefile variables. (From a patch by Carsten Larsen.)
104 Release 2016h - 2016-10-19 23:17:57 -0700
106 Changes to future time stamps
108 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
109 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
110 future fall transitions will be on the last Saturday of October
111 at 01:00, which is consistent with predicted spring transitions
112 on the last Saturday of March. (Thanks to Tim Parenti.)
114 Changes to past time stamps
116 In Turkey, transitions in 1986-1990 were at 01:00 standard time
117 not at 02:00, and the spring 1994 transition was on March 20, not
118 March 27. (Thanks to Kıvanç Yazan.)
120 Changes to past and future time zone abbreviations
122 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
123 instead of alphabetic ones like "IST" and "LKT". Various
124 English-language sources use "IST", "LKT" and "SLST", with no
125 working consensus. (Usage of "SLST" mentioned by Sadika
130 zic no longer mishandles relativizing file names when creating
131 symbolic links like /etc/localtime, when these symbolic links
132 are outside the usual directory hierarchy. This fixes a bug
133 introduced in 2016g. (Problem reported by Andreas Stieger.)
135 Changes to build procedure
137 New rules 'traditional_tarballs' and 'traditional_signatures' for
138 building just the traditional-format distribution. (Requested by
141 The file 'version' is now put into the tzdata tarball too.
142 (Requested by Howard Hinnant.)
144 Changes to documentation and commentary
146 The 'Theory' file now has a section on interface stability.
147 (Requested by Paul Koning.) It also mentions features like
148 tm_zone and localtime_rz that have long been supported by the
151 tz-link.htm has improved coverage of time zone boundaries suitable
152 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
155 The US commentary now mentions Allen and the "day of two noons".
157 The Fiji commentary mentions the government's 2016-10-03 press
158 release. (Thanks to Raymond Kumar.)
161 Release 2016g - 2016-09-13 08:56:38 -0700
163 Changes to future time stamps
165 Turkey switched from EET/EEST (+02/+03) to permanent +03,
166 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
167 than an invented abbreviation for the new time.
169 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
170 (Thanks to Tim Parenti.)
172 Changes to past time stamps
174 For America/Los_Angeles, spring-forward transition times have been
175 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
178 For zones using Soviet time on 1919-07-01, transitions to UT-based
179 time were at 00:00 UT, not at 02:00 local time. The affected
180 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
181 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
183 Changes to past and future time zone abbreviations
185 The Factory zone now uses the time zone abbreviation -00 instead
186 of a long English-language string, as -00 is now the normal way to
187 represent an undefined time zone.
189 Several zones in Antarctica and the former Soviet Union, along
190 with zones intended for ships at sea that cannot use POSIX TZ
191 strings, now use numeric time zone abbreviations instead of
192 invented or obsolete alphanumeric abbreviations. The affected
193 zones are Antarctica/Casey, Antarctica/Davis,
194 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
195 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
196 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
197 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
198 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
199 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
200 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
201 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
202 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
203 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
204 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
205 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
206 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
207 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
208 was replaced by +05, whereas MSK and MSD were kept as they are not
209 our invention and are widely used.
211 Changes to zone names
213 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
214 (Thanks to David Massoud.)
218 zic no longer generates binary files containing POSIX TZ-like
219 strings that disagree with the local time type after the last
220 explicit transition in the data. This fixes a bug with
221 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
222 stamps on the reference platform. (Thanks to Alexander Belopolsky
223 for reporting the bug and suggesting a way forward.)
225 If the installed localtime and/or posixrules files are symbolic
226 links, zic now keeps them symbolic links when updating them, for
227 compatibility with platforms like OpenSUSE where other programs
228 configure these files as symlinks.
230 zic now avoids hard linking to symbolic links, avoids some
231 unnecessary mkdir and stat system calls, and uses shorter file
234 zdump has a new -i option to generate transitions in a
235 more-compact but still human-readable format. This option is
236 experimental, and the output format may change in future versions.
237 (Thanks to Jon Skeet for suggesting that an option was needed,
238 and thanks to Tim Parenti and Chris Rovick for further comments.)
240 Changes to build procedure
242 An experimental distribution format is available, in addition
243 to the traditional format which will continue to be distributed.
244 The new format is a tarball tzdb-VERSION.tar.lz with signature
245 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
246 tzdb-VERSION containing the code and data of the traditional
247 two-tarball format, along with extra data that may be useful.
248 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
249 for comments about the experimental format.)
251 The release version number is now more accurate in the usual case
252 where releases are built from a Git repository. For example, if
253 23 commits and some working-file changes have been made since
254 release 2016g, the version number is now something like
255 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
256 Tagged releases use the same version number format as before,
257 e.g., '2016g'. To support the more-accurate version number, its
258 specification has moved from a line in the Makefile to a new
259 source file 'version'.
261 The experimental distribution contains a file to2050.tzs that
262 contains what should be the output of 'zdump -i -c 2050' on
263 primary zones. If this file is available, 'make check' now checks
264 that zdump generates this output.
266 'make check_web' now works on Fedora-like distributions.
268 Changes to documentation and commentary
270 tzfile.5 now documents the new restriction on POSIX TZ-like
271 strings that is now implemented by zic.
273 Comments now cite URLs for some 1917-1921 Russian DST decrees.
274 (Thanks to Alexander Belopolsky.)
276 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
277 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
278 description of Java 8 has been brought up to date (thanks to
279 Stephen Colebourne). Its description of local time on Mars has
280 been updated to match current practice, and URLs have been updated
281 and some obsolete ones removed.
284 Release 2016f - 2016-07-05 16:26:51 +0200
286 Changes affecting future time stamps
288 The Egyptian government changed its mind on short notice, and
289 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
290 (Thanks to Mina Samuel.)
292 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
293 (Thanks to Stepan Golosunov.)
295 Changes to past and future time stamps
297 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
298 abbreviations instead of invented ones.
300 Changes affecting past time stamps
302 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
303 (Thanks to Stepan Golosunov.)
306 Release 2016e - 2016-06-14 08:46:16 -0700
308 Changes affecting future time stamps
310 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
311 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
312 For future years, guess April's last Thursday to October's last
313 Thursday except for Ramadan.
315 Changes affecting past time stamps
317 Locations while uninhabited now use '-00', not 'zzz', as a
318 placeholder time zone abbreviation. This is inspired by Internet
319 RFC 3339 and is more consistent with numeric time zone
320 abbreviations already used elsewhere. The change affects several
321 arctic and antarctic locations, e.g., America/Cambridge_Bay before
322 1920 and Antarctica/Troll before 2005.
324 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
325 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
329 zic now outputs a dummy transition at time 2**31 - 1 in zones
330 whose POSIX-style TZ strings contain a '<'. This mostly works
331 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
332 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
334 Changes affecting documentation and commentary
336 tz-link.htm says why governments should give plenty of notice for
337 time zone or DST changes, and refers to Matt Johnson's blog post.
339 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
342 Release 2016d - 2016-04-17 22:50:29 -0700
344 Changes affecting future time stamps
346 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
347 (Thanks to Alexander Krivenyshev for the heads-up.)
349 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
350 (Thanks to Alexander Krivenyshev and Matt Johnson.)
352 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
353 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
354 at 02:00. (Thanks to Stepan Golosunov.)
356 Changes affecting past time stamps
358 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
359 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
360 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
361 the same change. (Thanks to Stepan Golosunov.)
363 Russia and nearby locations had daylight-saving transitions on
364 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
365 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
368 Many corrections to historical time in Kazakhstan from 1991
369 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
370 invented time zone abbreviations with numeric abbreviations.
372 Changes to commentary
374 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
377 Release 2016c - 2016-03-23 00:51:27 -0700
379 Changes affecting future time stamps
381 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
383 Chile reverts from permanent to seasonal DST. (Thanks to Juan
384 Correa for the heads-up, and to Tim Parenti for corrections.)
385 Guess that future transitions are August's and May's second
386 Saturdays at 24:00 mainland time. Also, call the period from
387 2014-09-07 through 2016-05-14 daylight saving time instead of
388 standard time, as that seems more appropriate now.
390 Changes affecting past time stamps
392 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
393 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
394 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
395 (Thanks to Stepan Golosunov.)
397 Changes to commentary
399 Several updates and URLs for historical and proposed Russian changes.
400 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
403 Release 2016b - 2016-03-12 17:30:14 -0800
407 Starting with release 2016b, some data entries cause zic implementations
408 derived from tz releases 2005j through 2015e to issue warnings like
409 "time zone abbreviation differs from POSIX standard (+03)".
410 These warnings should not otherwise affect zic's output and can safely be
411 ignored on today's platforms, as the warnings refer to a restriction in
412 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
413 warnings is to upgrade to zic derived from tz releases 2015f and later.
415 Changes affecting future time stamps
417 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
418 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
419 2016-03-27 at 02:00 local time. They need distinct zones since their
420 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
421 Altai Republic, Russia, which will switch from +06 to +07 on the same date
422 and local time. The Astrakhan change is already official; the others have
423 passed the first reading in the State Duma and are extremely likely.
424 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
425 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
426 and Stepan Golosunov for followup.)
428 As a trial of a new system that needs less information to be made up,
429 the new zones use numeric time zone abbreviations like "+04"
430 instead of invented abbreviations like "ASTT".
432 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
435 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
436 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
437 Saturday at 01:00, not March's last Friday at 24:00.
439 Changes affecting past time stamps
441 Europe/Chisinau observed DST during 1990, and switched from +04 to
442 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
443 (Thanks to Stepan Golosunov.)
445 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
446 KUYT/KUYST. (Thanks to Stepan Golosunov.)
450 tzselect's diagnostics and checking, and checktab.awk's checking,
451 have been improved. (Thanks to J William Piggott.)
453 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
455 tzselect now tests Julian-date TZ settings more accurately.
456 (Thanks to J William Piggott.)
458 Changes to commentary
460 Comments in zone tables have been improved. (Thanks to J William Piggott.)
462 tzselect again limits its menu comments so that menus fit on a
463 24x80 alphanumeric display.
465 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
467 In the Theory file, the description of possible time zone abbreviations in
468 tzdata has been cleaned up, as the old description was unclear and
469 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
472 Release 2016a - 2016-01-26 23:28:02 -0800
474 Changes affecting future time stamps
476 America/Cayman will not observe daylight saving this year after all.
477 Revert our guess that it would. (Thanks to Matt Johnson.)
479 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
480 (Thanks to Alexander Krivenyshev.)
482 Asia/Tehran now has DST predictions for the year 2038 and later,
483 to be March 21 00:00 to September 21 00:00. This is likely better
484 than predicting no DST, albeit off by a day every now and then.
486 Changes affecting past and future time stamps
488 America/Metlakatla switched from PST all year to AKST/AKDT on
489 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
491 America/Santa_Isabel has been removed, and replaced with a
492 backward compatibility link to America/Tijuana. Its contents were
493 apparently based on a misreading of Mexican legislation.
495 Changes affecting past time stamps
497 Asia/Karachi's two transition times in 2002 were off by a minute.
498 (Thanks to Matt Johnson.)
500 Changes affecting build procedure
502 An installer can now combine leap seconds with use of the backzone file,
503 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
504 The old 'make posix_packrat' rule is now marked as obsolescent.
505 (Thanks to Ian Abbott for an initial implementation.)
507 Changes affecting documentation and commentary
509 A new file LICENSE makes it easier to see that the code and data
510 are mostly public-domain. (Thanks to James Knight.) The three
511 non-public-domain files now use the current (3-clause) BSD license
512 instead of older versions of that license.
514 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
515 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
516 on editing tz source files (with a mention of Sublime zoneinfo,
517 thanks to Gilmore Davidson).
519 The Theory and asia files now mention the 2015 book "The Global
520 Transformation of Time, 1870-1950", and cite a couple of reviews.
522 The America/Chicago entry now documents the informal use of US
523 central time in Fort Pierre, South Dakota. (Thanks to Rick
524 McDermid, Matt Johnson, and Steve Jones.)
527 Release 2015g - 2015-10-01 00:39:51 -0700
529 Changes affecting future time stamps
531 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
534 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
535 (Thanks to Alexander Krivenyshev.)
537 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
538 (Thanks to Ken Rylander.)
540 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
541 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
542 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
544 Changes affecting past time stamps
546 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
548 Changes affecting code
550 localtime no longer mishandles America/Anchorage after 2037.
551 (Thanks to Bradley White for reporting the bug.)
553 On hosts with signed 32-bit time_t, localtime no longer mishandles
554 Pacific/Fiji after 2038-01-16 14:00 UTC.
556 The localtime module allows the variables 'timezone', 'daylight',
557 and 'altzone' to be in common storage shared with other modules,
558 and declares them in case the system <time.h> does not.
559 (Problems reported by Kees Dekker.)
561 On platforms with tm_zone, strftime.c now assumes it is not NULL.
562 This simplifies the code and is consistent with zdump.c.
563 (Problem reported by Christos Zoulas.)
565 Changes affecting documentation
567 The tzfile man page now documents that transition times denote the
568 starts (not the ends) of the corresponding time periods.
569 (Ambiguity reported by Bill Seymour.)
572 Release 2015f - 2015-08-10 18:06:56 -0700
574 Changes affecting future time stamps
576 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
577 The abbreviation remains "KST". (Thanks to Robert Elz.)
579 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
582 Changes affecting past and future time stamps
584 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
585 (Thanks to Roman Tudos.)
587 Changes affecting data format and code
589 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
590 field of a Rule line should now be '-'; the old values 'even',
591 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
592 Although the implementation has not changed, these features do not
593 work in the default installation, they are not used in the data,
594 and they are now considered obsolescent.
596 zic now checks that two rules don't take effect at the same time.
597 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
598 simultaneity are now documented.
600 The two characters '%z' in a zone format now stand for the UTC
601 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
602 five hours and thirty minutes ahead. This better supports time
603 zone abbreviations conforming to POSIX.1-2001 and later.
605 Changes affecting installed data files
607 Comments for America/Halifax and America/Glace_Bay have been improved.
608 (Thanks to Brian Inglis.)
610 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
611 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
612 installed data files for Europe/Simferopol and Europe/Tallinn.
613 It does not affect timestamps. (Thanks to Howard Hinnant.)
615 Changes affecting code
617 zdump and zic no longer warn about valid time zone abbreviations
620 Some Visual Studio 2013 warnings have been suppressed.
621 (Thanks to Kees Dekker.)
623 'date' no longer sets the time of day and its -a, -d, -n and -t
624 options have been removed. Long obsolescent, the implementation
625 of these features had porting problems. Builders no longer need
626 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
627 (Thanks to Kees Dekker for pointing out the problem.)
629 Changes affecting documentation
631 The Theory file mentions naming issues earlier, as these seem to be
632 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
634 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
636 Mention that Herbert Samuel introduced the term "Summer Time".
639 Release 2015e - 2015-06-13 10:56:02 -0700
641 Changes affecting future time stamps
643 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
644 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
646 Assume Cayman Islands will observe DST starting next year, using US rules.
647 Although it isn't guaranteed, it is the most likely.
649 Changes affecting data format
651 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
652 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
654 Changes affecting code
656 When displaying data, tzselect converts it to the current locale's
657 encoding if the iconv command works. (Problem reported by random832.)
659 tzselect no longer mishandles Dominica, fixing a bug introduced
660 in Release 2014f. (Problem reported by Owen Leibman.)
662 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
663 This fixes a bug introduced in Release 2014f.
664 (Problem reported by Leonardo Chiquitto.)
667 Release 2015d - 2015-04-24 08:09:46 -0700
669 Changes affecting future time stamps
671 Egypt will not observe DST in 2015 and will consider canceling it
672 permanently. For now, assume no DST indefinitely.
673 (Thanks to Ahmed Nazmy and Tim Parenti.)
675 Changes affecting past time stamps
677 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
678 1966-07-01. Also, Yukon's time zone history is documented better.
679 (Thanks to Brian Inglis and Dennis Ferguson.)
681 Change affecting past and future time zone abbreviations
683 The abbreviations for Hawaii-Aleutian standard and daylight times
684 have been changed from HAST/HADT to HST/HDT, as per US Government
685 Printing Office style. This affects only America/Adak since 1983,
686 as America/Honolulu was already using the new style.
688 Changes affecting code
690 zic has some minor performance improvements.
693 Release 2015c - 2015-04-11 08:55:55 -0700
695 Changes affecting future time stamps
697 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
698 not 00:00 on April's last Friday. 2015's transition will therefore be on
699 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
700 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
702 Changes affecting past time stamps
704 The following changes affect some pre-1991 Chile-related time stamps
705 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
707 The 1910 transition was January 10, not January 1.
709 The 1918 transition was September 10, not September 1.
711 The UT -04 time observed from 1932 to 1942 is now considered to
712 be standard time, not year-round DST.
714 Santiago observed DST (UT -03) from 1946-07-15 through
715 1946-08-31, then reverted to standard time, then switched to -05
718 Assume transitions before 1968 were at 00:00, since we have no data
721 The spring 1988 transition was 1988-10-09, not 1988-10-02.
722 The fall 1990 transition was 1990-03-11, not 1990-03-18.
724 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
725 and omit all transitions on Pacific/Easter from 1942 through 1946
726 since we have no data suggesting that they existed.
728 One more zone has been turned into a link, as it differed
729 from an existing zone only for older time stamps. As usual,
730 this change affects UTC offsets in pre-1970 time stamps only.
731 The zone's old contents have been moved to the 'backzone' file.
732 The affected zone is America/Montreal.
734 Changes affecting commentary
736 Mention the TZUpdater tool.
738 Mention "The Time Now". (Thanks to Brandon Ramsey.)
741 Release 2015b - 2015-03-19 23:28:11 -0700
743 Changes affecting future time stamps
745 Mongolia will start observing DST again this year, from the last
746 Saturday in March at 02:00 to the last Saturday in September at 00:00.
747 (Thanks to Ganbold Tsagaankhuu.)
749 Palestine will start DST on March 28, not March 27. Also,
750 correct the fall 2014 transition from September 26 to October 24.
751 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
753 Changes affecting past time stamps
755 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
756 regression. (Thanks to Stuart Bishop for reporting the problem.)
758 Some more zones have been turned into links, when they differed
759 from existing zones only for older time stamps. As usual,
760 these changes affect UTC offsets in pre-1970 time stamps only.
761 Their old contents have been moved to the 'backzone' file.
762 The affected zones are: America/Antigua, America/Cayman,
763 Pacific/Midway, and Pacific/Saipan.
765 Changes affecting time zone abbreviations
767 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
770 Changes affecting code
772 Fix integer overflow bug in reference 'mktime' implementation.
773 (Problem reported by Jörg Richter.)
775 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
776 to be used in the same executable as standard-library time_t functions.
777 (Problems reported by Bradley White.)
779 Changes affecting commentary
781 Cite the recent Mexican decree changing Quintana Roo's time zone.
782 (Thanks to Carlos Raúl Perasso.)
784 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
786 Update info about Mars time.
789 Release 2015a - 2015-01-29 22:35:20 -0800
791 Changes affecting future time stamps
793 The Mexican state of Quintana Roo, represented by America/Cancun,
794 will shift from Central Time with DST to Eastern Time without DST
795 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
797 Chile will not change clocks in April or thereafter; its new standard time
798 will be its old daylight saving time. This affects America/Santiago,
799 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
801 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
802 (Thanks to Tim Parenti.)
804 Changes affecting past time stamps
806 Iceland observed DST in 1919 and 1921, and its 1939 fallback
807 transition was Oct. 29, not Nov. 29. Remove incorrect data from
808 Shanks about time in Iceland between 1837 and 1908.
810 Some more zones have been turned into links, when they differed
811 from existing zones only for older time stamps. As usual,
812 these changes affect UTC offsets in pre-1970 time stamps only.
813 Their old contents have been moved to the 'backzone' file.
814 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
817 Changes affecting code
819 tzalloc now scrubs time zone abbreviations compatibly with the way
820 that tzset always has, by replacing invalid bytes with '_' and by
821 shortening too-long abbreviations.
823 tzselect ports to POSIX awk implementations, no longer mishandles
824 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
825 settings to the user. (Thanks to Stefan Kuhn.)
827 Changes affecting build procedure
829 'make check' now checks for links to links in the data.
830 One such link (for Africa/Asmera) has been fixed.
831 (Thanks to Stephen Colebourne for pointing out the problem.)
833 Changes affecting commentary
835 The leapseconds file commentary now mentions the expiration date.
836 (Problem reported by Martin Burnicki.)
838 Update Mexican Library of Congress URL.
841 Release 2014j - 2014-11-10 17:37:11 -0800
843 Changes affecting current and future time stamps
845 Turks & Caicos' switch from US eastern time to UT -04 year-round
846 did not occur on 2014-11-02 at 02:00. It's currently scheduled
847 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
849 Changes affecting past time stamps
851 Many pre-1989 time stamps have been corrected for Asia/Seoul and
852 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
853 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
854 longer guess that Pyongyang mimicked Seoul time after World War II,
855 as this is politically implausible.
857 Some more zones have been turned into links, when they differed
858 from existing zones only for older time stamps. As usual,
859 these changes affect UTC offsets in pre-1970 time stamps only.
860 Their old contents have been moved to the 'backzone' file.
861 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
862 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
863 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
866 Changes affecting commentary
868 The commentary is less enthusiastic about Shanks as a source,
869 and is more careful to distinguish UT from UTC.
872 Release 2014i - 2014-10-21 22:04:57 -0700
874 Changes affecting future time stamps
876 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
877 (Thanks to Ken Rylander for the heads-up.) Guess that future
878 years will use a similar pattern.
880 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
881 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
882 (Thanks to Kiley Walbom for the heads-up.)
884 Changes affecting time zone abbreviations
886 Since Belarus is not changing its clocks even though Moscow is,
887 the time zone abbreviation in Europe/Minsk is changing from FET
888 to its more-traditional value MSK on 2014-10-26 at 01:00.
889 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
891 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
892 Indochina, to distinguish it better from ICT (+07).
894 Changes affecting past time stamps
896 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
897 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
898 authoritative book). Asia/Ho_Chi_Minh has been added to
899 zone1970.tab, to give tzselect users in Vietnam two choices,
900 since north and south Vietnam disagreed after our 1970 cutoff.
902 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
903 they differed from existing zones only for older time stamps. As
904 usual, these changes affect pre-1970 time stamps only. Their old
905 contents have been moved to the 'backzone' file.
907 Changes affecting code
909 The time-related library functions now set errno on failure, and
910 some crashes in the new tzalloc-related library functions have
911 been fixed. (Thanks to Christos Zoulas for reporting most of
912 these problems and for suggesting fixes.)
914 If USG_COMPAT is defined and the requested time stamp is standard time,
915 the tz library's localtime and mktime functions now set the extern
916 variable timezone to a value appropriate for that time stamp; and
917 similarly for ALTZONE, daylight saving time, and the altzone variable.
918 This change is a companion to the tzname change in 2014h, and is
919 designed to make timezone and altzone more compatible with tzname.
921 The tz library's functions now set errno to EOVERFLOW if they fail
922 because the result cannot be represented. ctime and ctime_r now
923 return NULL and set errno when a time stamp is out of range, rather
924 than having undefined behavior.
926 Some bugs associated with the new 2014g functions have been fixed.
927 This includes a bug that largely incapacitated the new functions
928 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
929 It also includes some uses of uninitialized variables after tzalloc.
930 The new code uses the standard type 'ssize_t', which the Makefile
931 now gives porting advice about.
933 Changes affecting commentary
935 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
938 Release 2014h - 2014-09-25 18:59:03 -0700
940 Changes affecting past time stamps
942 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
944 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
945 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
947 Some more zones have been turned into links, when they differed
948 from existing zones only for older time stamps. As usual,
949 these changes affect UTC offsets in pre-1970 time stamps only.
950 Their old contents have been moved to the 'backzone' file.
951 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
952 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
953 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
955 Changes affecting code
957 zdump -V and -v now output gmtoff= values on all platforms,
958 not merely on platforms defining TM_GMTOFF.
960 The tz library's localtime and mktime functions now set tzname to a value
961 appropriate for the requested time stamp, and zdump now uses this
962 on platforms not defining TM_ZONE, fixing a 2014g regression.
963 (Thanks to Tim Parenti for reporting the problem.)
965 The tz library no longer sets tzname if localtime or mktime fails.
967 zdump -c no longer mishandles transitions near year boundaries.
968 (Thanks to Tim Parenti for reporting the problem.)
970 An access to uninitialized data has been fixed.
971 (Thanks to Jörg Richter for reporting the problem.)
973 When THREAD_SAFE is defined, the code ports to the C11 memory model.
974 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
975 and two threads race to initialize data used by gmtime-like functions.
976 (Thanks to Andy Heninger for reporting the problems.)
978 Changes affecting build procedure
980 'make check' now checks better for properly-sorted data.
982 Changes affecting documentation and commentary
984 zdump's gmtoff=N output is now documented, and its isdst=D output
985 is now documented to possibly output D values other than 0 or 1.
987 zdump -c's treatment of years is now documented to use the
988 Gregorian calendar and Universal Time without leap seconds,
989 and its behavior at cutoff boundaries is now documented better.
990 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
992 Programs are now documented to use the proleptic Gregorian calendar.
993 (Thanks to Alan Barrett for the suggestion.)
995 Fractional-second GMT offsets have been documented for civil time
996 in 19th-century Chennai, Jakarta, and New York.
999 Release 2014g - 2014-08-28 12:31:23 -0700
1001 Changes affecting future time stamps
1003 Turks & Caicos is switching from US eastern time to UT -04
1004 year-round, modeled as a switch on 2014-11-02 at 02:00.
1005 [As noted in 2014j, this switch was later delayed.]
1007 Changes affecting past time stamps
1009 Time in Russia or the USSR before 1926 or so has been corrected by
1010 a few seconds in the following zones: Asia/Irkutsk,
1011 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1012 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1013 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1014 Vladimir Karpinsky.)
1016 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1017 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
1018 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1019 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1020 (Thanks to Stephen Colebourne for pointing to the decree.)
1022 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1024 A new file 'backzone' contains data which may appeal to
1025 connoisseurs of old time stamps, although it is out of scope for
1026 the tz database, is often poorly sourced, and contains some data
1027 that is known to be incorrect. The new file is not recommended
1028 for ordinary use and its entries are not installed by default.
1029 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1030 Isle of Man entries.)
1032 Some more zones have been turned into links, when they differed
1033 from existing zones only for older time stamps. As usual,
1034 these changes affect UTC offsets in pre-1970 time stamps only.
1035 Their old contents have been moved to the 'backzone' file.
1036 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1037 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1038 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1040 Changes affecting code
1042 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1043 supplies functions for creating and using objects that represent
1044 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1045 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1046 time2posix_z. They are intended for performance: for example,
1047 localtime_rz (unlike localtime_r) is trivially thread-safe without
1048 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1049 functions, and to Alan Barrett and Jonathan Lennox for helping to
1052 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1053 This lets zdump use tz features even if the system library lacks them.
1054 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1055 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1057 zdump now uses localtime_rz if available, as it's significantly faster,
1058 and it can help zdump better diagnose invalid time zone names.
1059 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1060 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1061 not available, zdump now uses localtime_r and tzset if available,
1062 as this is a bit cleaner and faster than plain localtime. Compile
1063 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1064 lacks these two functions.
1066 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1067 Although not needed for tz's own applications, which are single-threaded,
1068 this supports POSIX better if the tz library is used in multithreaded apps.
1070 Some crashes have been fixed when zdump or the tz library is given
1071 invalid or outlandish input.
1073 The tz library no longer mishandles leap seconds on platforms with
1074 unsigned time_t in time zones that lack ordinary transitions after 1970.
1076 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1077 already defined, to make it easier to configure on common platforms.
1078 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1080 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1081 assumes that reading uninitialized memory yields garbage values
1082 but does not cause other problems such as traps.
1084 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1085 more likely to guess right for ambiguous time stamps near
1086 transitions where tm_isdst does not change.
1088 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1089 strftime_l for compatibility with recent versions of POSIX.
1090 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1091 to 1 on recent POSIX versions, and to 0 otherwise.
1093 tzselect -c now uses a hybrid distance measure that works better
1094 in Africa. (Thanks to Alan Barrett for noting the problem.)
1096 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1097 or when time_tz is defined.
1099 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1100 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1101 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1102 This affects GNU/Linux and similar systems.
1104 For easier maintenance later, some C code has been simplified,
1105 some lint has been removed, and the code has been tweaked so that
1106 plain 'make' is more likely to work.
1108 The C type 'bool' is now used for boolean values, instead of 'int'.
1110 The long-obsolete LOCALE_HOME code has been removed.
1112 The long-obsolete 'gtime' function has been removed.
1114 Changes affecting build procedure
1116 'zdump' no longer links in ialloc.o, as it's not needed.
1118 'make check_time_t_alternatives' no longer assumes GNU diff.
1120 Changes affecting distribution tarballs
1122 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1123 the tzdata tarball instead of the tzcode tarball, since they help
1124 maintain the data. The NEWS and Theory files are now also
1125 distributed in the tzdata tarball, as they're relevant for data.
1126 (Thanks to Alan Barrett for pointing this out.) Also, the
1127 leapseconds.awk file is no longer distributed in the tzcode
1128 tarball, since it belongs in the tzdata tarball (where 2014f
1129 inadvertently also distributed it).
1131 Changes affecting documentation and commentary
1133 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1134 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1137 The man pages have been updated to use function prototypes,
1138 to document thread-safe variants like localtime_r, and to document
1139 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1142 The fields in Link lines have been renamed to be more descriptive
1143 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1144 and LINK-TO has become LINK-NAME.
1146 tz-link.htm mentions the IETF's tzdist working group; Windows
1147 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1149 Some broken URLs have been fixed in the commentary. (Thanks to
1152 Commentary about Philippines DST has been updated, and commentary
1153 on pre-1970 time in India has been added.
1156 Release 2014f - 2014-08-05 17:42:36 -0700
1158 Changes affecting future time stamps
1160 Russia will subtract an hour from most of its time zones on 2014-10-26
1161 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1162 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1163 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1164 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1165 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1166 (Europe/Samara) are not changing their clocks. The changed zones are
1167 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1168 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1169 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1170 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1171 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1172 but not its UTC offset. Two zones are added: Asia/Chita (split
1173 from Asia/Yakutsk, and also with two hours subtracted) and
1174 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1175 subtracted). (Thanks to Tim Parenti for much of the above.)
1177 Changes affecting time zone abbreviations
1179 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1180 and similarly for the other Australian zones. That is, for eastern
1181 standard and daylight saving time the abbreviations are AEST and AEDT
1182 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1183 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1184 This change does not affect UTC offsets, only time zone abbreviations.
1185 (Thanks to Rich Tibbett and many others.)
1187 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1188 effective 2014-10-26 at 02:00 local time.
1190 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1191 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1193 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1194 Similarly, prefer EET/EEST for eastern European time in Russia.
1196 Change time zone abbreviations in (western) Samoa to use "ST" and
1197 "DT" suffixes, as this is more likely to match common practice.
1198 Prefix "W" to (western) Samoa time when its standard-time offset
1199 disagrees with that of American Samoa.
1201 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1203 Time zone abbreviations have been updated for Japan's two time
1204 zones used 1896-1937. JWST now stands for Western Standard
1205 Time, and JCST for Central Standard Time (formerly this was CJT).
1206 These abbreviations are now used for time in Korea, Taiwan,
1207 and Sakhalin while controlled by Japan.
1209 Changes affecting past time stamps
1211 China's five zones have been simplified to two, since the post-1970
1212 differences in the other three seem to have been imaginary. The
1213 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1214 removed; backwards-compatibility links still work, albeit with
1215 different behaviors for time stamps before May 1980. Asia/Urumqi's
1216 1980 transition to UT +08 has been removed, so that it is now at
1217 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1218 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1220 Some zones have been turned into links, when they differed from existing
1221 zones only for older UTC offsets where data entries were likely invented.
1222 These changes affect UTC offsets in pre-1970 time stamps only. This is
1223 similar to the change in release 2013e, except this time for western
1224 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1225 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1226 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1227 Atlantic/St_Helena. This also affects the backwards-compatibility
1228 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1229 Tim Parenti, and David Patte for reporting problems in earlier
1230 versions of this change.)
1232 Asia/Shanghai's pre-standard-time UT offset has been changed from
1233 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1234 transition to standard time has been changed from 1928 to 1901.
1236 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1237 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1238 In 1946 it observed DST from 05-15 through 09-30; in 1947
1239 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1240 (Thanks to Yu-Cheng Chuang.)
1242 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1244 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1245 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1247 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1248 period from 1911 to 1950.
1250 Pacific/Chatham has been changed to New Zealand standard time plus
1251 45 minutes for the period before 1957, reflecting a 1956 remark in
1252 the New Zealand parliament.
1254 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1255 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1256 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1257 not 04-06 at 02:00; and there was no DST in 1920.
1259 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1261 Time in Russia before 1927 or so has been corrected by a few seconds in
1262 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1263 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1264 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1265 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1267 Changes affecting data format
1269 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1270 The new file's extended format allows multiple country codes per zone.
1271 The older file is still installed but is deprecated; its format is
1272 not changing and it will still be distributed for a while, but new
1273 applications should use the new file.
1275 The new file format simplifies maintenance of obscure locations.
1276 To test this, it adds coverage for the Crozet Islands and the
1277 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1279 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1280 It is still ASCII now, but commentary about the switch has been added.
1281 The new file 'zone1970.tab' already uses UTF-8.
1283 Changes affecting code
1285 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1286 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1288 'zic' no longer mishandles input when ignoring case in locales that
1289 are not compatible with English, e.g., unibyte Turkish locales when
1290 compiled with HAVE_GETTEXT.
1292 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1293 they no longer use ASCII '-' as if it were a dash.
1295 'zic' now rejects output file names that contain '.' or '..' components.
1296 (Thanks to Tim Parenti for reporting the problem.)
1298 'zic -v' now warns about output file names that do not follow
1299 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1300 David Olson for starting the ball rolling on this.)
1302 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1304 Changes affecting build procedure
1306 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1307 (Thanks to John Cochran.)
1309 Changes affecting documentation and commentary
1311 The 'Theory' file documents legacy names, the longstanding
1312 exceptions to the POSIX-inspired file name rules.
1314 The 'zic' documentation clarifies the role of time types when
1315 interpreting dates. (Thanks to Arthur David Olson.)
1317 Documentation and commentary now prefer UTF-8 to US-ASCII,
1318 allowing the use of proper accents in foreign words and names.
1319 Code and data have not changed because of this. (Thanks to
1320 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1323 Non-HTML documentation and commentary now use plain-text URLs instead of
1324 HTML insertions, and are more consistent about bracketing URLs when they
1325 are not already surrounded by white space. (Thanks to suggestions by
1328 There is new commentary about Xujiahui Observatory, the five time-zone
1329 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1330 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1331 warlord Jin Shuren in the data.
1333 Commentary about the coverage of each Russian zone has been standardized.
1334 (Thanks to Tim Parenti).
1336 There is new commentary about contemporary timekeeping in Ethiopia.
1338 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1340 There is new commentary about time in Poland in 1919.
1342 Proper credit has been given to DST inventor George Vernon Hudson.
1344 Commentary about time in Metlakatla, AK and Resolute, NU has been
1345 improved, with a new source for the former.
1347 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1350 Commentary about permanent Antarctic bases has been updated.
1352 Several typos have been corrected. (Thanks to Tim Parenti for
1353 contributing some of these fixes.)
1355 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1356 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1357 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1358 (Thanks to a heads-up from Dirkjan Ochtman.)
1360 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1361 have been removed. These obsolescent US Naval Observatory entries were no
1362 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1365 Release 2014e - 2014-06-12 21:53:52 -0700
1367 Changes affecting near-future time stamps
1369 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1370 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1371 switch to standard time at 24:00 the last Thursday before Ramadan, and
1372 back to DST at 00:00 the first Friday after Ramadan.
1374 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1375 to Milamber Space Network.) Guess that from 2015 on Morocco will
1376 temporarily switch to standard time at 03:00 the last Saturday before
1377 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1379 Changes affecting past time stamps
1381 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1382 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1383 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1384 in 1991. (Thanks to Hank W. for reporting the problems.)
1386 Changes affecting commentary
1388 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1389 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1390 removes stale pointers to World Time Explorer and WORLDTIME.
1393 Release 2014d - 2014-05-27 21:34:40 -0700
1395 Changes affecting code
1397 zic no longer generates files containing time stamps before the Big Bang.
1398 This works around GNOME bug 730332
1399 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1400 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1401 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1403 Changes affecting documentation
1405 tz-link.htm now mentions GNOME.
1408 Release 2014c - 2014-05-13 07:44:13 -0700
1410 Changes affecting near-future time stamps
1412 Egypt observes DST starting 2014-05-15 at 24:00.
1413 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1414 Details have not been announced, except that DST will not be observed
1415 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1416 Morocco, and that Egypt's future spring and fall transitions will be the
1417 same as 2010 when it last observed DST, namely April's last Friday at
1418 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1419 that Ramadan transitions will be at 00:00 standard time.
1421 Changes affecting code
1423 zic now generates transitions for minimum time values, eliminating guesswork
1424 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
1426 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1428 Changes affecting commentary and documentation
1430 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1433 Release 2014b - 2014-03-24 21:28:50 -0700
1435 Changes affecting near-future time stamps
1437 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1438 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1440 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1441 Bengt-Inge Larsson.) This is currently an approximation; a better version
1442 will require the zic and localtime fixes mentioned below, and the plan is
1443 to wait for a while until at least the zic fixes propagate.
1445 Changes affecting code
1447 'zic' and 'localtime' no longer reject locations needing four transitions
1448 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1449 Also, 'zic' avoids some unlikely failures due to integer overflow.
1451 Changes affecting build procedure
1453 'make check' now detects Rule lines defined but never used.
1454 The NZAQ rules, an instance of this problem, have been removed.
1456 Changes affecting commentary and documentation
1458 Fix Tuesday/Thursday typo in description of time in Israel.
1459 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1461 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1462 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1463 library supports them.
1465 Add comments about Johnston Island time in the 1960s.
1466 (Thanks to Lyle McElhaney.)
1468 Morocco's 2014 DST start will be as predicted.
1469 (Thanks to Sebastien Willemijns.)
1472 Release 2014a - 2014-03-07 23:30:29 -0800
1474 Changes affecting near-future time stamps
1476 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1477 the heads-up, and to Tim Parenti for simplifying the update.)
1479 Changes affecting past time stamps
1481 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1482 (Thanks to Steffen Thorsen.)
1484 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1485 (not 1992-01-01), and observed DST during the entire next winter.
1486 (Thanks to Vladimir in Moscow via Alois Treindl.)
1488 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1489 (Thanks to Avigdor Finkelstein.)
1491 Changes affecting code
1493 A uninitialized-storage bug in 'localtime' has been fixed.
1494 (Thanks to Logan Chien.)
1496 Changes affecting the build procedure
1498 The settings for 'make check_web' now default to Ubuntu 13.10.
1500 Changes affecting commentary and documentation
1502 The boundary of the US Pacific time zone is given more accurately.
1503 (Thanks to Alan Mintz.)
1505 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1507 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1509 Better descriptions of countries with same time zone history as
1510 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1512 Several changes affect tz-link.htm, the main web page.
1514 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1517 Mention xCal (Internet RFC 6321) and jCal.
1519 Microsoft has some support for tz database names.
1521 CLDR data formats include both XML and JSON.
1523 Mention Maggiolo's map of solar vs standard time.
1524 (Thanks to Arthur David Olson.)
1526 Mention TZ4Net. (Thanks to Matt Johnson.)
1528 Mention the timezone-olson Haskell package.
1530 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1532 Remove moribund links to daylight-savings-time.info and to
1533 Simple Timer + Clocks.
1535 Update two links. (Thanks to Oscar van Vlijmen.)
1537 Fix some formatting glitches, e.g., remove random newlines from
1538 abbr elements' title attributes.
1541 Release 2013i - 2013-12-17 07:25:23 -0800
1543 Changes affecting near-future time stamps:
1545 Jordan switches back to standard time at 00:00 on December 20, 2013.
1546 The 2006-2011 transition schedule is planned to resume in 2014.
1547 (Thanks to Steffen Thorsen.)
1549 Changes affecting past time stamps:
1551 In 2004, Cuba began DST on March 28, not April 4.
1552 (Thanks to Steffen Thorsen.)
1554 Changes affecting code
1556 The compile-time flag NOSOLAR has been removed, as nowadays the
1557 benefit of slightly shrinking runtime table size is outweighed by the
1558 cost of disallowing potential future updates that exceed old limits.
1560 Changes affecting documentation and commentary
1562 The files solar87, solar88, and solar89 are no longer distributed.
1563 They were a negative experiment - that is, a demonstration that
1564 tz data can represent solar time only with some difficulty and error.
1565 Their presence in the distribution caused confusion, as Riyadh
1566 civil time was generally not solar time in those years.
1568 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1571 Release 2013h - 2013-10-25 15:32:32 -0700
1573 Changes affecting current and future time stamps:
1575 Libya has switched its UT offset back to +02 without DST, instead
1576 of +01 with DST. (Thanks to Even Scharning.)
1578 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1579 (Thanks to Gwillim Law.)
1581 Changes affecting future time stamps:
1583 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1584 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1585 (Thanks to Steffen Thorsen.)
1587 Add entries for DST transitions in Morocco in the year 2038.
1588 This avoids some year-2038 glitches introduced in 2013g.
1589 (Thanks to Yoshito Umaoka for reporting the problem.)
1591 Changes affecting API
1593 The 'tzselect' command no longer requires the 'select' command,
1594 and should now work with /bin/sh on more platforms. It also works
1595 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1596 Patrick 'P. J.' McDermott and Alan Barrett.)
1598 Changes affecting code
1600 Fix localtime overflow bugs with 32-bit unsigned time_t.
1602 zdump no longer assumes sscanf returns maximal values on overflow.
1604 Changes affecting the build procedure
1606 The builder can specify which programs to use, if any, instead of
1607 'ar' and 'ranlib', and libtz.a is now built locally before being
1608 installed. (Thanks to Michael Forney.)
1610 A dependency typo in the 'zdump' rule has been fixed.
1611 (Thanks to Andrew Paprocki.)
1613 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1614 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1616 'make clean' no longer removes 'leapseconds', since it's
1617 host-independent and is part of the distribution.
1619 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1621 Changes affecting documentation and commentary
1623 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1624 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1626 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1627 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1628 longer maintained) and for old advisories. SOFA now does C.
1630 Release 2013g - 2013-09-30 21:08:26 -0700
1632 Changes affecting current and near-future time stamps
1634 Morocco now observes DST from the last Sunday in March to the last
1635 Sunday in October, not April to September respectively. (Thanks
1636 to Steffen Thorsen.)
1638 Changes affecting 'zic'
1640 'zic' now runs on platforms that lack both hard links and symlinks.
1641 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1642 Also, fix some bugs on platforms that lack hard links but have symlinks.
1644 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1645 to predict the far future, fixing a bug introduced in 2013e.
1647 Changes affecting the build procedure
1649 The 'leapseconds' file is again put into the tzdata tarball.
1650 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1651 Matt Burgess and Ian Abbott.) The timestamps of these and other
1652 dependent files in tarballs are adjusted more consistently.
1654 Changes affecting documentation and commentary
1656 The README file is now part of the data tarball as well as the code.
1657 It now states that files are public domain unless otherwise specified.
1658 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1659 Its details about the 1989 release moved to a place of honor near
1663 Release 2013f - 2013-09-24 23:37:36 -0700
1665 Changes affecting near-future time stamps
1667 Tocantins will very likely not observe DST starting this spring.
1668 (Thanks to Steffen Thorsen.)
1670 Jordan will likely stay at UT +03 indefinitely, and will not fall
1673 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1675 Changes affecting API
1677 The types of the global variables 'timezone' and 'altzone' (if present)
1678 have been changed back to 'long'. This is required for 'timezone'
1679 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1680 These variables were originally 'long' in the tz code, but were
1681 mistakenly changed to 'time_t' in 1987; nobody reported the
1682 incompatibility until now. The difference matters on x32, where
1683 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1685 Changes affecting the build procedure
1687 Avoid long strings in leapseconds.awk to work around a mawk bug.
1688 (Thanks to Cyril Baurand.)
1690 Changes affecting documentation and commentary
1692 New file 'NEWS' that contains release notes like this one.
1694 Paraguay's law does not specify DST transition time; 00:00 is customary.
1695 (Thanks to Waldemar Villamayor-Venialbo.)
1697 Minor capitalization fixes.
1699 Changes affecting version-control only
1701 The experimental GitHub repository now contains annotated and
1702 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1703 Releases are tagged starting with 2012e; earlier releases were
1704 done differently, and tags would either not have a simple name or
1705 not exactly match what was released.
1707 'make set-timestamps' is now simpler and a bit more portable.
1710 Release 2013e - 2013-09-19 23:50:04 -0700
1712 Changes affecting near-future time stamps
1714 This year Fiji will start DST on October 27, not October 20.
1715 (Thanks to David Wheeler for the heads-up.) For now, guess that
1716 Fiji will continue to spring forward the Sunday before the fourth
1719 Changes affecting current and future time zone abbreviations
1721 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1722 time zone abbreviations since 1932. (Thanks to George Ziegler,
1723 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1724 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1725 Asia/Makassar, and Asia/Pontianak.
1727 Use ART (UT -03, standard time), rather than WARST (also -03, but
1728 daylight saving time) for San Luis, Argentina since 2009.
1730 Changes affecting Godthåb time stamps after 2037 if version mismatch
1732 Allow POSIX-like TZ strings where the transition time's hour can
1733 range from -167 through 167, instead of the POSIX-required 0
1734 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1735 new Fiji rules. This is a more-compact way to represent
1736 far-future time stamps for America/Godthab, America/Santiago,
1737 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1738 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1739 this change. (Derived from a suggestion by Arthur David Olson.)
1741 Allow POSIX-like TZ strings where daylight saving time is in
1742 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1743 Argentina Summer Time all year. This supports a more-compact way
1744 to represent the 2013d data for America/Argentina/San_Luis.
1745 Because of the change for San Luis noted above this change does not
1746 affect the current data. (Thanks to Andrew Main (Zefram) for
1747 suggestions that improved this change.)
1749 Where these two TZ changes take effect, there is a minor extension
1750 to the tz file format in that it allows new values for the
1751 embedded TZ-format string, and the tz file format version number
1752 has therefore been increased from 2 to 3 as a precaution.
1753 Version-2-based client code should continue to work as before for
1754 all time stamps before 2038. Existing version-2-based client code
1755 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1756 files, and typically works in practice even for time stamps after
1757 2037; the only known exception is America/Godthab.
1759 Changes affecting time stamps before 1970
1761 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1762 some errors before 1947.
1764 Some zones have been turned into links, when they differ from existing
1765 zones only in older data entries that were likely invented or that
1766 differ only in LMT or transitions from LMT. These changes affect
1767 only time stamps before 1943. The affected zones are:
1768 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1769 America/Grenada, America/Guadeloupe, America/Marigot,
1770 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1771 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1772 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1773 confirming that the old Europe/Vaduz zone was wrong and the new
1774 link is better for WWII-era times.)
1776 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1777 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1780 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1781 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1784 Change the date of the circa-1850 Zurich transition from 1849-09-12
1785 to 1853-07-16, overriding Shanks with data from Messerli about
1786 postal and telegraph time in Switzerland.
1788 Changes affecting time zone abbreviations before 1970
1790 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1791 as Jakarta was called Batavia back then.
1793 Changes affecting API
1795 The 'zic' command now outputs a dummy transition when far-future
1796 data can't be summarized using a TZ string, and uses a 402-year
1797 window rather than a 400-year window. For the current data, this
1798 affects only the Asia/Tehran file. It does not affect any of the
1799 time stamps that this file represents, so zdump outputs the same
1800 information as before. (Thanks to Andrew Main (Zefram).)
1802 The 'date' command has a new '-r' option, which lets you specify
1803 the integer time to display, a la FreeBSD.
1805 The 'tzselect' command has two new options '-c' and '-n', which lets you
1806 select a zone based on latitude and longitude.
1808 The 'zic' command's '-v' option now warns about constructs that
1809 require the new version-3 binary file format. (Thanks to Arthur
1810 David Olson for the suggestion.)
1812 Support for floating-point time_t has been removed.
1813 It was always dicey, and POSIX no longer requires it.
1814 (Thanks to Eric Blake for suggesting to the POSIX committee to
1815 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1816 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1817 bugs and elucidating some of the corners of the old floating-point
1820 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1821 changed back to the old practice of using 'long' to represent UT
1822 offsets. This had been inadvertently and mistakenly changed to
1823 'int_fast32_t'. (Thanks to Christos Zoulas.)
1825 The code avoids undefined behavior on integer overflow in some
1826 more places, including gmtime, localtime, mktime and zdump.
1828 Changes affecting the zdump utility
1830 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1831 "UTC" does not make sense for time stamps that predate the introduction
1832 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1833 for clarifying UT vs UTC.)
1835 Data changes affecting behavior of tzselect and similar programs
1837 Country code BQ is now called the more-common name "Caribbean Netherlands"
1838 rather than the more-official "Bonaire, St Eustatius & Saba".
1840 Remove from zone.tab the names America/Montreal, America/Shiprock,
1841 and Antarctica/South_Pole, as they are equivalent to existing
1842 same-country-code zones for post-1970 time stamps. The data entries for
1843 these names are unchanged, so the names continue to work as before.
1845 Changes affecting code internals
1847 zic -c now runs way faster on 64-bit hosts when given large numbers.
1849 zic now uses vfprintf to avoid allocating and freeing some memory.
1851 tzselect now computes the list of continents from the data,
1852 rather than have it hard-coded.
1854 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1856 Changes affecting the build procedure
1858 The 'leapseconds' file is now generated automatically from a
1859 new file 'leap-seconds.list', which is a copy of
1860 <ftp://time.nist.gov/pub/leap-seconds.list>.
1861 A new source file 'leapseconds.awk' implements this.
1862 The goal is simplification of the future maintenance of 'leapseconds'.
1864 When building the 'posix' or 'right' subdirectories, if the
1865 subdirectory would be a copy of the default subdirectory, it is
1866 now made a symbolic link if that is supported. This saves about
1867 2 MB of file system space.
1869 The links America/Shiprock and Antarctica/South_Pole have been
1870 moved to the 'backward' file. This affects only nondefault builds
1871 that omit 'backward'.
1873 Changes affecting version-control only
1875 .gitignore now ignores 'date'.
1877 Changes affecting documentation and commentary
1879 Changes to the 'tzfile' man page
1881 It now mentions that the binary file format may be extended in
1882 future versions by appending data.
1884 It now refers to the 'zdump' and 'zic' man pages.
1886 Changes to the 'zic' man page
1888 It lists conditions that elicit a warning with '-v'.
1890 It says that the behavior is unspecified when duplicate names
1891 are given, or if the source of one link is the target of another.
1893 Its examples are updated to match the latest data.
1895 The definition of white space has been clarified slightly.
1896 (Thanks to Michael Deckers.)
1898 Changes to the 'Theory' file
1900 There is a new section about the accuracy of the tz database,
1901 describing the many ways that errors can creep in, and
1902 explaining why so many of the pre-1970 time stamps are wrong or
1903 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1904 Wollman for discussions that contributed to this).
1906 The 'Theory' file describes LMT better (this follows a
1907 suggestion by Guy Harris).
1909 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1911 It's mentioned that excluding 'backward' should not affect the
1912 other data, and it suggests at least one zone.tab name per
1913 inhabited country (thanks to Stephen Colebourne).
1915 Some longstanding restrictions on names are documented, e.g.,
1916 'America/New_York' precludes 'America/New_York/Bronx'.
1918 It gives more reasons for the 1970 cutoff.
1920 It now mentions which time_t variants are supported, such as
1921 signed integer time_t. (Thanks to Paul Goyette for reporting
1922 typos in an experimental version of this change.)
1924 (Thanks to Philip Newton for correcting typos in these changes.)
1926 Documentation and commentary is more careful to distinguish UT in
1927 general from UTC in particular. (Thanks to Steve Allen.)
1929 Add a better source for the Zurich 1894 transition.
1930 (Thanks to Pierre-Yves Berger.)
1932 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1935 Release 2013d - 2013-07-05 07:38:01 -0700
1937 Changes affecting future time stamps:
1939 Morocco's midsummer transitions this year are July 7 and August 10,
1940 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1942 Israel now falls back on the last Sunday of October.
1943 (Thanks to Ephraim Silverberg.)
1945 Changes affecting past time stamps:
1947 Specify Jerusalem's location more precisely; this changes the pre-1880
1950 Changing affecting metadata only:
1952 Fix typos in the entries for country codes BQ and SX.
1954 Changes affecting code:
1956 Rework the code to fix a bug with handling Australia/Macquarie on
1957 32-bit hosts (thanks to Arthur David Olson).
1959 Port to platforms like NetBSD, where time_t can be wider than long.
1961 Add support for testing time_t types other than the system's.
1962 Run 'make check_time_t_alternatives' to try this out.
1963 Currently, the tests fail for unsigned time_t;
1964 this should get fixed at some point.
1966 Changes affecting documentation and commentary:
1968 Deemphasize the significance of national borders.
1970 Update the zdump man page.
1972 Remove obsolete NOID comment (thanks to Denis Excoffier).
1974 Update several URLs and comments in the web pages.
1976 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1978 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1981 Release 2013c - 2013-04-19 16:17:40 -0700
1983 Changes affecting current and future time stamps:
1985 Palestine observed DST starting March 29, 2013. (Thanks to
1986 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1987 with the predicted rules being the last Thursday in March at 24:00
1988 to the first Friday on or after September 21 at 01:00.
1990 Assume that the recent change to Paraguay's DST rules is permanent,
1991 by moving the end of DST to the 4th Sunday in March every year.
1992 (Thanks to Carlos Raúl Perasso.)
1994 Changes affecting past time stamps:
1996 Fix some historical data for Palestine to agree with that of
1997 timeanddate.com, as follows:
1999 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2002 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2005 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2007 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2009 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2011 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2013 Fix times of habitation for Macquarie to agree with the Tasmania
2014 Parks & Wildlife Service history, which indicates that permanent
2015 habitation was 1899-1919 and 1948 on.
2017 Changing affecting metadata only:
2019 Macquarie Island is politically part of Australia, not Antarctica.
2020 (Thanks to Tobias Conradi.)
2022 Sort Macquarie more-consistently with other parts of Australia.
2023 (Thanks to Tim Parenti.)
2026 Release 2013b - 2013-03-10 22:33:40 -0700
2028 Changes affecting current and future time stamps:
2030 Haiti uses US daylight-saving rules this year, and presumably future years.
2031 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
2033 Paraguay will end DST on March 24 this year.
2034 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2036 Morocco does not observe DST during Ramadan;
2037 try to predict Ramadan in Morocco as best we can.
2038 (Thanks to Erik Homoet for the heads-up.)
2040 Changes affecting commentary:
2042 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2043 Update URL for Solaris. Mention Internet RFC 6557.
2044 Update Internet RFCs 2445->5545, 2822->5322.
2045 Switch from FTP to HTTP for Internet RFCs.
2048 Release 2013a - 2013-02-27 09:20:35 -0800
2050 Change affecting binary data format:
2052 The zone offset at the end of version-2-format zone files is now
2053 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2055 Changes affecting current and future time stamps:
2057 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2058 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2059 (Thanks to Steffen Thorsen and Robert Elz.)
2061 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2062 (Thanks to Tobias Conradi and Arthur David Olson.)
2064 Many changes affect historical time stamps before 1940.
2065 These were deduced from: Milne J. Civil time. Geogr J. 1899
2066 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
2068 Changes affecting the code:
2070 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2071 the data). (Thanks to Arthur David Olson.)
2073 Fix localtime bug when time_t is unsigned and data files were generated
2074 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2075 to Arthur David Olson for fixing.)
2077 Allow the email address for bug reports to be set by the packager.
2078 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2080 Update HTML checking to be compatible with Ubuntu 12.10.
2082 Check that files are a safe subset of ASCII. At some point we may
2083 relax this requirement to a safe subset of UTF-8. Without the
2084 check, some non-UTF-8 encodings were leaking into the distribution.
2088 Restore a comment about copyright notices that was inadvertently deleted.
2089 (Thanks to Arthur David Olson.)
2091 Improve the commentary about which districts observe what times
2092 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2094 Add web page links to tz.js.
2096 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2099 Release 2012j - 2012-11-12 18:34:49 -0800
2101 Libya moved to CET this weekend, but with DST planned next year.
2102 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2104 Signatures now have the extension .asc, not .sign, as that's more
2105 standard. (Thanks to Phil Pennock.)
2107 The output of 'zdump --version', and of 'zic --version', now
2108 uses a format that is more typical for --version.
2109 (Thanks to Joseph S. Myers.)
2111 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2112 now uses tz@iana.org rather than the old elsie address.
2114 zic -v now complains about abbreviations that are less than 3
2115 or more than 6 characters, as per Posix. Formerly, it checked
2116 for abbreviations that were more than 3.
2118 'make public' no longer puts its temporary directory under /tmp,
2119 and uses the just-built zic rather than the system zic.
2121 Various fixes to documentation and commentary.
2124 Release 2012i - 2012-11-03 12:57:09 -0700
2126 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2128 Linker flags can now be specified via LDFLAGS.
2129 AWK now defaults to 'awk', not 'nawk'.
2130 The shell in tzselect now defaults to /bin/bash, but this can
2131 be overridden by specifying KSHELL.
2132 The main web page now mentions the unofficial GitHub repository.
2133 (Thanks to Mike Frysinger.)
2135 Tarball signatures can now be built by running 'make signatures'.
2136 There are also new makefile rules 'tarballs', 'check_public', and
2137 separate makefile rules for each tarball and signature file.
2138 A few makefile rules are now more portable to strict POSIX.
2140 The main web page now lists the canonical IANA URL.
2143 Release 2012h - 2012-10-26 22:49:10 -0700
2145 Bahia no longer has DST. (Thanks to Kelley Cook.)
2147 Tocantins has DST. (Thanks to Rodrigo Severo.)
2149 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2151 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2155 More C modernization, except that at Arthur David Olson's suggestion
2156 the instances of 'register' were kept.
2159 Release 2012g - 2012-10-17 20:59:45 -0700
2161 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2163 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2167 To attack the version-number problem, this release ships the file
2168 'Makefile' (which contains the release number) in both the tzcode and
2169 the tzdata tarballs. The two Makefiles are identical, and should be
2170 identical in any matching pair of tarballs, so it shouldn't matter
2171 which order you extract the tarballs. Perhaps we can come up with a
2172 better version-number scheme at some point; this scheme does have the
2173 virtue of not adding more files.
2176 Release 2012f - 2012-09-12 23:17:03 -0700
2178 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2179 20 this year. (Thanks to Steffen Thorsen.)
2182 Release 2012e - 2012-08-02 20:44:55 -0700
2184 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2185 (Thanks to Steffen Thorsen.)
2187 * Use a single version number for both code and data.
2189 * .gitignore: New file.
2191 * Remove trailing white space.
2194 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2196 Changes for Morocco's time stamps, which take effect in a couple of
2197 hours, along with infrastructure changes to accommodate how the tz
2198 code and data are released on IANA.
2201 Release data2012c - 2012-03-27 12:17:25 -0400
2204 Summer time changes for Morocco (to start late April 2012)
2207 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2210 Haiti following US/Canada rules for 2012 (and we're assuming,
2211 for now anyway, for the future).
2214 Release 2012b - 2012-03-02 12:29:15 +0700
2216 There is just one change to tzcode2012b (compared with 2012a):
2217 the Makefile that was accidentally included with 2012a has been
2218 replaced with the version that should have been there, which is
2219 identical with the previous version (from tzcode2011i).
2221 There are just two changes in tzdata2012b compared with 2012a.
2223 Most significantly, summer time in Cuba has been delayed 3 weeks
2224 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2225 date, as listed in 2012a) is just a little over a week away, this
2228 Less importantly, an excess tab in one of the changes in zone.tab
2229 in 2012a has been removed.
2232 Release 2012a - 2012-03-01 18:28:10 +0700
2234 The changes in tzcode2012a (compared to the previous version, 2011i)
2235 are entirely to the README and tz-art.htm and tz-link.htm files, if
2236 none of those concern you, you can ignore the code update. The changes
2237 reflect the changed addresses for the mailing list and the code and
2238 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2239 has been added to tz-link.htm).
2241 In tzdata2012a (compared to the previous release, which was 2011n)
2242 the major changes are:
2243 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2244 Falkland Islands onto permanent summer time (we're assuming for the
2245 foreseeable future, though 2012 is all we're fairly certain of.)
2246 Armenia has abolished Summer Time.
2247 Tokelau jumped the International Date Line back last December
2248 (just the same as their near neighbour, Samoa).
2249 America/Creston is a new zone for a small area of British Columbia
2250 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2252 Other minor changes are:
2253 Corrections to 1918 Canadian summer time end dates.
2254 Updated URL for UK time zone history (in comments)
2255 A few typos in Le Corre's list of free French place names (comments)
2258 Release data2011n - 2011-10-30 14:57:54 +0700
2260 There are three changes of note - most urgently, Cuba (America/Havana)
2261 has extended summer time by two weeks, now to end on Nov 13, rather than
2262 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2263 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2264 all, and consequently that zone has been removed (again) and reinstated
2265 in the "backward" file as a link to Europe/Chisinau. And third, the
2266 end date for Fiji's summer time this summer was moved forward from the
2267 earlier planned Feb 26, to Jan 22.
2269 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2270 (and the incorrect syntax that was in the 2011m version of that file
2271 is so fixed - it would have been fixed in a different way had this
2272 change not happened - that's the "missing" sccs version id).
2275 Release data2011m - 2011-10-24 21:42:16 +0700
2277 In particular, the typos in comments in the data (2011-11-17 should have
2278 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2279 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2280 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2281 Tim Parenti, and also Denys Gavrysh)
2283 In addition, I added Europe/Tiraspol to zone.tab.
2285 This time, all the files have new version numbers... (including the files
2286 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2287 version numbers there...)
2290 Release data2011l - 2011-10-10 11:15:43 +0700
2292 There are just 2 changes that cause different generated tzdata files from
2293 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2294 is included, but commented out. Compared with the diff I sent out last week,
2295 this version also includes attributions for the sources for the changes
2296 (in much the same format as ado used, but the html tags have not been
2297 checked, verified, or used in any way at all, so if there are errors there,
2298 please let me know.)
2301 Release data2011k - 2011-09-20 17:54:03 -0400
2306 Release data2011j - 2011-09-12 09:22:49 -0400
2308 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2309 Tanzania); there are also two spelling corrections to comments in
2310 the australasia file (with thanks to Christos Zoulas).
2313 Release 2011i - 2011-08-29 05:56:32 -0400
2318 Release data2011h - 2011-06-15 18:41:48 -0400
2320 Russia and Curaçao changes
2323 Release 2011g - 2011-04-25 09:07:22 -0400
2325 update the rules for Egypt to reflect its abandonment of DST this year
2328 Release 2011f - 2011-04-06 17:14:53 -0400
2333 Release 2011e - 2011-03-31 16:04:38 -0400
2335 Morocco, Chile, and tz-link changes
2338 Release 2011d - 2011-03-14 09:18:01 -0400
2340 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
2343 Release 2011c - 2011-03-07 09:30:09 -0500
2345 These do affect current time stamps in Chile and Annette Island, Canada.
2348 Release 2011b - 2011-02-07 08:44:50 -0500
2353 Release 2011a - 2011-01-24 10:30:16 -0500
2358 Release data2010o - 2010-11-01 09:18:23 -0400
2360 change to the end of DST in Fiji in 2011
2363 Release 2010n - 2010-10-25 08:19:17 -0400
2368 Release 2010m - 2010-09-27 09:24:48 -0400
2370 Hong Kong, Vostok, and zic.c changes
2373 Release 2010l - 2010-08-16 06:57:25 -0400
2378 Release 2010k - 2010-07-26 10:42:27 -0400
2383 Release 2010j - 2010-05-10 09:07:48 -0400
2385 changes for Bahía de Banderas and for version naming
2388 Release data2010i - 2010-04-16 18:50:45 -0400
2390 the end of DST in Morocco on 2010-08-08
2393 Release data2010h - 2010-04-05 09:58:56 -0400
2398 Release data2010g - 2010-03-24 11:14:53 -0400
2403 Release 2010f - 2010-03-22 09:45:46 -0400
2408 Release data2010e - 2010-03-08 14:24:27 -0500
2410 corrects the Dhaka bug found by Danvin Ruangchan
2413 Release data2010d - 2010-03-06 07:26:01 -0500
2418 Release 2010c - 2010-03-01 09:20:58 -0500
2420 changes including KRE's suggestion for earlier initialization of
2421 "goahead" and "goback" structure elements
2424 Release code2010a - 2010-02-16 10:40:04 -0500
2429 Release data2010b - 2010-01-20 12:37:01 -0500
2434 Release data2010a - 2010-01-18 08:30:04 -0500
2439 Release data2009u - 2009-12-26 08:32:28 -0500
2441 changes to DST in Bangladesh
2444 Release 2009t - 2009-12-21 13:24:27 -0500
2449 Release data2009s - 2009-11-14 10:26:32 -0500
2451 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2454 Release 2009r - 2009-11-09 10:10:31 -0500
2456 "antarctica" and "tz-link.htm" changes
2459 Release 2009q - 2009-11-02 09:12:40 -0500
2461 with two corrections as reported by Eric Muller and Philip Newton
2464 Release data2009p - 2009-10-23 15:05:27 -0400
2466 Argentina (including San Luis) changes (with the correction from
2470 Release data2009o - 2009-10-14 16:49:38 -0400
2472 Samoa (commentary only), Pakistan, and Bangladesh changes
2475 Release data2009n - 2009-09-22 15:13:38 -0400
2477 added commentary for Argentina and a change to the end of DST in
2481 Release data2009m - 2009-09-03 10:23:43 -0400
2483 Samoa and Palestine changes
2486 Release data2009l - 2009-08-14 09:13:07 -0400
2488 Samoa (comments only) and Egypt
2491 Release 2009k - 2009-07-20 09:46:08 -0400
2496 Release data2009j - 2009-06-15 06:43:59 -0400
2498 Bangladesh change (with a short turnaround since the DST change is
2502 Release 2009i - 2009-06-08 09:21:22 -0400
2504 updating for DST in Bangladesh this year
2507 Release 2009h - 2009-05-26 09:19:14 -0400
2512 Release data2009g - 2009-04-20 16:34:07 -0400
2517 Release data2009f - 2009-04-10 11:00:52 -0400
2519 correct DST in Pakistan
2522 Release 2009e - 2009-04-06 09:08:11 -0400
2527 Release 2009d - 2009-03-23 09:38:12 -0400
2529 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2532 Release data2009c - 2009-03-16 09:47:51 -0400
2534 change to the start of Cuban DST
2537 Release 2009b - 2009-02-09 11:15:22 -0500
2542 Release 2009a - 2009-01-21 10:09:39 -0500
2547 Release data2008i - 2008-10-21 12:10:25 -0400
2549 southamerica and zone.tab files, with Argentina DST rule changes and
2550 United States zone reordering and recommenting
2553 Release 2008h - 2008-10-13 07:33:56 -0400
2558 Release 2008g - 2008-10-06 09:03:18 -0400
2560 Fix a broken HTML anchor and update Brazil's DST transitions;
2561 there's also a slight reordering of information in tz-art.htm.
2564 Release data2008f - 2008-09-09 22:33:26 -0400
2569 Release 2008e - 2008-07-28 14:11:17 -0400
2571 changes by Arthur David Olson and Jesper Nørgaard Welen
2574 Release data2008d - 2008-07-07 09:51:38 -0400
2576 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2579 Release data2008c - 2008-05-19 17:48:03 -0400
2581 Pakistan, Morocco, and Mongolia
2584 Release data2008b - 2008-03-24 08:30:59 -0400
2586 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2590 Release 2008a - 2008-03-08 05:42:16 -0500
2595 Release 2007k - 2007-12-31 10:25:22 -0500
2597 most importantly, changes to the "southamerica" file based on
2598 Argentina's readoption of daylight saving time
2601 Release 2007j - 2007-12-03 09:51:01 -0500
2603 1. eliminate the "P" (parameter) macro;
2605 2. the "noncontroversial" changes circulated on the time zone
2606 mailing list (less the changes to "logwtmp.c");
2608 3. eliminate "too many transition" errors when "min" is used in time
2611 4. changes by Paul Eggert (including updated information for Venezuela).
2614 Release data2007i - 2007-10-30 10:28:11 -0400
2616 changes for Cuba and Syria
2619 Release 2007h - 2007-10-01 10:05:51 -0400
2621 changes by Paul Eggert, as well as an updated link to the ICU
2622 project in tz-link.htm
2625 Release 2007g - 2007-08-20 10:47:59 -0400
2627 changes by Paul Eggert
2629 The "leapseconds" file has been updated to incorporate the most
2630 recent International Earth Rotation and Reference Systems Service
2633 There's an addition to tz-art.htm regarding the television show "Medium".
2636 Release 2007f - 2007-05-07 10:46:46 -0400
2638 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2641 changes to zic.c to allow hour values greater than 24 (along with
2642 Paul's improved time value overflow checking)
2645 Release 2007e - 2007-04-02 10:11:52 -0400
2647 Syria and Honduras changes by Paul Eggert
2649 zic.c variable renaming changes by Arthur David Olson
2652 Release 2007d - 2007-03-20 08:48:30 -0400
2654 changes by Paul Eggert
2656 the elimination of white space at the ends of lines
2659 Release 2007c - 2007-02-26 09:09:37 -0500
2661 changes by Paul Eggert
2664 Release 2007b - 2007-02-12 09:34:20 -0500
2666 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2668 changes to the commentary in "leapseconds" reflecting the IERS
2669 announcement that there is to be no positive leap second at the end
2673 Release 2007a - 2007-01-08 12:28:29 -0500
2675 changes by Paul Eggert
2677 Derick Rethan's Asmara change
2679 Oscar van Vlijmen's Easter Island local mean time change
2681 symbolic link changes
2684 Release 2006p - 2006-11-27 08:54:27 -0500
2686 changes by Paul Eggert
2689 Release 2006o - 2006-11-06 09:18:07 -0500
2691 changes by Paul Eggert
2694 Release 2006n - 2006-10-10 11:32:06 -0400
2696 changes by Paul Eggert
2699 Release 2006m - 2006-10-02 15:32:35 -0400
2701 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2703 (minimalist) changes to zic.8 to clarify "until" information
2706 Release data2006l - 2006-09-18 12:58:11 -0400
2708 Paul's best-effort work on this coming weekend's Egypt time change
2711 Release 2006k - 2006-08-28 12:19:09 -0400
2713 changes by Paul Eggert
2716 Release 2006j - 2006-08-21 09:56:32 -0400
2718 changes by Paul Eggert
2721 Release code2006i - 2006-08-07 12:30:55 -0400
2725 Ken Pizzini's conversion script
2728 Release code2006h - 2006-07-24 09:19:37 -0400
2730 adds public domain notices to four files
2732 includes a fix for transition times being off by a second
2734 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2737 Release 2006g - 2006-05-08 17:18:09 -0400
2739 northamerica changes by Paul Eggert
2742 Release 2006f - 2006-05-01 11:46:00 -0400
2744 a missing version number problem is fixed (with thanks to Bradley
2745 White for catching the problem)
2748 Release 2006d - 2006-04-17 14:33:43 -0400
2750 changes by Paul Eggert
2752 added new items to tz-arts.htm that were found by Paul
2755 Release 2006c - 2006-04-03 10:09:32 -0400
2757 two sets of data changes by Paul Eggert
2759 a fencepost error fix in zic.c
2761 changes to zic.c and the "europe" file to minimize differences
2762 between output produced by the old 32-bit zic and the new 64-bit
2766 Release 2006b - 2006-02-20 10:08:18 -0500
2767 [tz32code2006b + tz64code2006b + tzdata2006b]
2771 All SCCS IDs were bumped to "8.1" for this release.
2774 Release 2006a - 2006-01-30 08:59:31 -0500
2776 changes by Paul Eggert (in particular, Indiana time zone moves)
2778 an addition to the zic manual page to describe how special-case
2779 transitions are handled
2782 Release 2005r - 2005-12-27 09:27:13 -0500
2784 Canadian changes by Paul Eggert
2786 They also add "<pre>" directives to time zone data files and reflect
2787 changes to warning message logic in "zdump.c" (but with calls to
2788 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2791 Release 2005q - 2005-12-13 09:17:09 -0500
2793 Nothing earth-shaking here:
2794 1. Electronic mail addresses have been removed.
2795 2. Casts of the return value of exit have been removed.
2796 3. Casts of the argument of is.* macros have been added.
2797 4. Indentation in one section of zic.c has been fixed.
2798 5. References to dead URLs in the data files have been dealt with.
2801 Release 2005p - 2005-12-05 10:30:53 -0500
2803 "systemv", "tz-link.htm", and "zdump.c" changes
2804 (less the casts of arguments to the is* macros)
2807 Release 2005o - 2005-11-28 10:55:26 -0500
2809 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2811 zdump.c lint fixes by Arthur David Olson
2814 Release 2005n - 2005-10-03 09:44:09 -0400
2816 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2820 Release 2005m - 2005-08-29 12:15:40 -0400
2822 changes by Paul Eggert (with a small tweak to the tz-art change)
2824 a declaration of an unused variable has been removed from zdump.c
2827 Release 2005l - 2005-08-22 12:06:39 -0400
2829 changes by Paul Eggert
2831 overflow/underflow checks by Arthur David Olson, minus changes to
2832 the "Theory" file about the pending addition of 64-bit data (I grow
2833 less confident of the changes being accepted with each passing day,
2834 and the changes no longer increase the data files nine-fold--there's
2835 less than a doubling in size by my local Sun's reckoning)
2838 Release 2005k - 2005-07-14 14:14:24 -0400
2840 The "leapseconds" file has been edited to reflect the recently
2841 announced leap second at the end of 2005.
2843 I've also deleted electronic mail addresses from the files as an
2847 Release 2005j - 2005-06-13 14:34:13 -0400
2849 These reflect changes to limit the length of time zone abbreviations
2850 and the characters used in those abbreviations.
2852 There are also changes to handle POSIX-style "quoted" time zone
2853 environment variables.
2855 The changes were circulated on the time zone mailing list; the only
2856 change since then was the removal of a couple of minimum-length of
2857 abbreviation checks.
2860 Release data2005i - 2005-04-21 15:04:16 -0400
2862 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2865 Release 2005h - 2005-04-04 11:24:47 -0400
2867 changes by Paul Eggert
2869 minor changes to Makefile and zdump.c to produce more useful output
2870 when doing a "make typecheck"
2873 Release 2005g - 2005-03-14 10:11:21 -0500
2875 changes by Paul Eggert (a change to current DST rules in Uruguay and
2876 an update to a link to time zone software)
2879 Release 2005f - 2005-03-01 08:45:32 -0500
2881 data and documentation changes by Paul Eggert
2884 Release 2005e - 2005-02-10 15:59:44 -0500
2889 Release code2005d - 2005-01-31 09:21:47 -0500
2891 make zic complain about links to links if the -v flag is used
2893 have "make public" do more code checking
2895 add an include to "localtime.c" for the benefit of gcc systems
2898 Release 2005c - 2005-01-17 18:36:29 -0500
2900 get better results when mktime runs on a system where time_t is double
2902 changes to the data files (most importantly to Paraguay)
2905 Release 2005b - 2005-01-10 09:19:54 -0500
2907 Get localtime and gmtime working on systems with exotic time_t types.
2909 Update the leap second commentary in the "leapseconds" file.
2912 Release 2005a - 2005-01-01 13:13:44 -0500
2917 Release code2004i - 2004-12-14 13:42:58 -0500
2919 Deal with systems where time_t is unsigned.
2922 Release code2004h - 2004-12-07 11:40:18 -0500
2924 64-bit-time_t changes
2927 Release 2004g - 2004-11-02 09:06:01 -0500
2929 update to Cuba (taking effect this weekend)
2931 other changes by Paul Eggert
2933 correction of the spelling of Oslo
2935 changed versions of difftime.c and private.h
2938 Release code2004f - 2004-10-21 10:25:22 -0400
2940 Cope with wide-ranging tm_year values.
2943 Release 2004e - 2004-10-11 14:47:21 -0400
2945 Brazil/Argentina/Israel changes by Paul Eggert
2947 changes to tz-link.htm by Paul
2949 one small fix to Makefile
2952 Release 2004d - 2004-09-22 08:27:29 -0400
2954 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2957 Release 2004c - 2004-08-11 12:06:26 -0400
2959 asctime-related changes
2961 (variants of) some of the documentation changes suggested by Paul Eggert
2964 Release 2004b - 2004-07-19 14:33:35 -0400
2966 data changes by Paul Eggert - most importantly, updates for Argentina
2969 Release 2004a - 2004-05-27 12:00:47 -0400
2971 changes by Paul Eggert
2973 Handle DST transitions that occur at the end of a month in some
2974 years but at the start of the following month in other years.
2976 Add a copy of the correspondence that's the basis for claims about
2977 DST in the Navajo Nation.
2980 Release 2003e - 2003-12-15 09:36:47 -0500
2982 changes by Arthur David Olson (primarily code changes)
2984 changes by Paul Eggert (primarily data changes)
2986 minor changes to "Makefile" and "northamerica" (in the latter case,
2987 optimization of the "Toronto" rules)
2990 Release 2003d - 2003-10-06 09:34:44 -0400
2992 changes by Paul Eggert
2995 Release 2003c - 2003-09-16 10:47:05 -0400
2997 Fix bad returns in zic.c's inleap function.
2998 Thanks to Bradley White for catching the problem!
3001 Release 2003b - 2003-09-16 07:13:44 -0400
3003 Add a "--version" option (and documentation) to the zic and zdump commands.
3005 changes to overflow/underflow checking in zic
3007 a localtime typo fix.
3009 Update the leapseconds and tz-art.htm files.
3012 Release 2003a - 2003-03-24 09:30:54 -0500
3014 changes by Paul Eggert
3016 a few additions and modifications to the tz-art.htm file
3019 Release 2002d - 2002-10-15 13:12:42 -0400
3021 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3023 There's also a new time zone quote in "tz-art.htm".
3026 Release 2002c - 2002-04-04 11:55:20 -0500
3028 changes by Paul Eggert
3030 Change zic.c to avoid creating symlinks to files that don't exist.
3033 Release 2002b - 2002-01-28 12:56:03 -0500
3035 [These change notes are for Release 2002a, which was corrupted.
3036 2002b was a corrected version of 2002a.]
3038 changes by Paul Eggert
3040 Update the "leapseconds" file to note that there'll be no leap
3041 second at the end of June, 2002.
3043 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3045 Change to "difftime.c" to avoid sizeof problems.
3048 Release 2001d - 2001-10-09 13:31:32 -0400
3050 changes by Paul Eggert
3053 Release 2001c - 2001-06-05 13:59:55 -0400
3055 changes by Paul Eggert and Andrew Brown
3058 Release 2001b - 2001-04-05 16:44:38 -0400
3060 changes by Paul Eggert (modulo jnorgard's typo fix)
3062 tz-art.htm has been HTMLified.
3065 Release 2001a - 2001-03-13 12:57:44 -0500
3067 changes by Paul Eggert
3069 An addition to the "leapseconds" file: comments with the text of the
3070 latest IERS leap second notice.
3072 Trailing white space has been removed from data file lines, and
3073 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3077 Release 2000h - 2000-12-14 15:33:38 -0500
3079 changes by Paul Eggert
3081 one typo fix in the "art" file
3083 With providence, this is the last update of the millennium.
3086 Release 2000g - 2000-10-10 11:35:22 -0400
3088 changes by Paul Eggert
3090 correction of John Mackin's name submitted by Robert Elz
3092 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3093 Emmy Awards broadcast.
3096 Release 2000f - 2000-08-10 09:31:58 -0400
3098 changes by Paul Eggert
3100 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3102 Error checking and messages in the "yearistype" script have been
3106 Release 2000e - 2000-07-31 09:27:54 -0400
3108 data changes by Paul Eggert
3110 a change to the default value of the defined constant HAVE_STRERROR
3112 the addition of a Dave Barry quote on DST to the tz-arts file
3115 Release 2000d - 2000-04-20 15:43:04 -0400
3117 changes to the documentation and code of strftime for C99 conformance
3119 a bug fix for date.c
3121 These are based on (though modified from) changes by Paul Eggert.
3124 Release 2000c - 2000-03-04 10:31:43 -0500
3126 changes by Paul Eggert
3129 Release 2000b - 2000-02-21 12:16:29 -0500
3131 changes by Paul Eggert and Joseph Myers
3133 modest tweaks to the tz-art.htm and tz-link.htm files
3136 Release 2000a - 2000-01-18 09:21:26 -0500
3138 changes by Paul Eggert
3140 The two hypertext documents have also been renamed.
3143 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3145 Paul Eggert's changes
3147 additions to the "zic" manual page and the "Arts.htm" file
3150 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3155 Release data1999h - 1999-10-07 03:50:29 -0400
3157 changes by Paul Eggert to "europe" (most importantly, fixing
3158 Lithuania and Estonia)
3161 Release 1999g - 1999-09-28 11:06:18 -0400
3163 data changes by Paul Eggert (most importantly, the change for
3164 Lebanon that buys correctness for this coming Sunday)
3166 The "code" file contains changes to "Makefile" and "checktab.awk" to
3167 allow better checking of time zone files before they are published.
3170 Release 1999f - 1999-09-23 09:48:14 -0400
3172 changes by Arthur David Olson and Paul Eggert
3175 Release 1999e - 1999-08-17 15:20:54 -0400
3177 changes circulated by Paul Eggert, although the change to handling
3178 of DST-specifying time zone names has been commented out for now
3179 (search for "XXX" in "localtime.c" for details). These files also
3180 do not make any changes to the start of DST in Brazil.
3182 In addition to Paul's changes, there are updates to "Arts.htm" and
3186 Release 1999d - 1999-03-30 11:31:07 -0500
3188 changes by Paul Eggert
3190 The Makefile's "make public" rule has also been changed to do a test
3191 compile of each individual time zone data file (which should help
3192 avoid problems such as the one we had with Nicosia).
3195 Release 1999c - 1999-03-25 09:47:47 -0500
3197 changes by Paul Eggert, most importantly the change for Chile.
3200 Release 1999b - 1999-02-01 17:51:44 -0500
3202 changes by Paul Eggert
3204 code changes (suggested by Mani Varadarajan, mani at be.com) for
3205 correct handling of symbolic links when building using a relative directory
3207 code changes to generate correct messages for failed links
3209 updates to the URLs in Arts.htm
3212 Release 1999a - 1999-01-19 16:20:29 -0500
3214 error message internationalizations and corrections in zic.c and
3215 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3219 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3221 changes for Brazil, Chile, and Germany
3223 support for use of "24:00" in the input files for the time zone compiler
3226 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3228 changes by Paul Eggert
3230 correction to a define in the "private.h" file
3233 Release data1998g - 1998-08-11 03:28:35 -0000
3234 [tzdata1998g.tar.gz is missing!]
3236 Lithuanian change provided by mgedmin at pub.osf.it
3238 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3239 "backward") to ensure that the GMT file is created even where folks
3240 don't want the "backward" links (as suggested by Paul Eggert).
3243 Release data1998f - 1998-07-20 13:50:00 -0000
3244 [tzdata1998f.tar.gz is missing!]
3246 Update the "leapseconds" file to include the newly-announced
3247 insertion at the end of 1998.
3250 Release code1998f - 1998-06-01 10:18:31 -0400
3252 addition to localtime.c by Guy Harris
3255 Release 1998e - 1998-05-28 09:56:26 -0400
3257 The Makefile is changed to produce zoneinfo-posix rather than
3258 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3261 data changes by Paul Eggert
3263 changes from Guy Harris to provide asctime_r and ctime_r
3265 A usno1998 file (substantially identical to usno1997) has been added.
3268 Release 1998d - 1998-05-14 11:58:34 -0400
3270 changes to comments (in particular, elimination of references to CIA maps).
3271 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3272 where changes occur.
3275 Release 1998c - 1998-02-28 12:32:26 -0500
3277 changes by Paul Eggert (save the "French correction," on which I'll
3278 wait for the dust to settle)
3282 changes and additions to Arts.htm
3285 Release 1998b - 1998-01-17 14:31:51 -0500
3287 URL cleanups and additions
3290 Release 1998a - 1998-01-13 12:37:35 -0500
3292 changes by Paul Eggert
3295 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3297 changes by Paul Eggert, with minor modifications from Arthur David
3298 Olson to make the files more browser friendly
3301 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3303 minor changes to put "TZif" at the start of each time zone information file
3305 a rule has also been added to the Makefile so you can
3307 to just recompile the zone information files (rather than doing a
3308 full "make install" with its other effects).
3311 Release data1997i - 1997-10-07 08:45:38 -0400
3313 changes to Africa by Paul Eggert
3316 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3318 corrections for Uruguay (and other locations)
3320 Arthur David Olson's simple-minded fix allowing mktime to both
3321 correctly handle leap seconds and correctly handle tm_sec values
3322 upon which arithmetic has been performed.
3325 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3327 Paul Eggert's updates
3329 a small change to a function prototype;
3331 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3332 include information on Around the World in Eighty Days.
3335 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3337 fixes to zic's error handling
3339 changes inspired by the item circulated on Slovenia
3341 The description of Web resources has been HTMLified for browsing
3344 A new piece of tz-related music has been added to the "Music" file.
3347 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3349 Paul Eggert's latest suggestions
3352 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3354 changes to "zic.c" to correct performance of the "-s" option
3356 a new file "usno1997"
3359 Release data1997c - 1997-03-04 09:58:18 -0500
3364 Release 1997b - 1997-02-27 18:34:19 -0500
3366 The data file incorporates the 1997 leap second.
3368 The code file incorporates Arthur David Olson's take on the
3369 zic/multiprocessor/directory-creation situation.
3372 Release 1997a - 1997-01-21 09:11:10 -0500
3374 Paul Eggert's Antarctica (and other changes)
3376 Arthur David Olson finessed the "getopt" issue by checking against
3377 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3378 is returned while SunOS 5.5's manual says EOF is returned).
3381 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3383 Paul Eggert's latest changes
3386 Release code1996n - 1996-12-16 09:42:02 -0500
3388 link snapping fix from Bruce Evans (via Garrett Wollman)
3391 Release data1996m - 1996-11-24 02:37:34 -0000
3392 [tzdata1996m.tar.gz is missing!]
3394 Paul Eggert's batch of changes
3397 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3399 No functional changes here; the files have simply been changed to
3400 make more use of ISO style dates in comments. The names of the above
3401 files now include the year in full.
3404 Release code96l - 1996-09-08 17:12:20 -0400
3406 tzcode96k was missing a couple of pieces.
3409 Release 96k - 1996-09-08 16:06:22 -0400
3411 the latest round of changes from Paul Eggert
3413 the recent Year 2000 material
3416 Release code96j - 1996-07-30 13:18:53 -0400
3418 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3421 Release code96i - 1996-07-27 20:11:35 -0400
3423 Paul's suggested patch for strftime %V week numbers
3426 Release data96i - 1996-07-01 18:13:04 -0400
3428 "northamerica" and "europe" changes by Paul Eggert
3431 Release code96h - 1996-06-05 08:02:21 -0400
3433 fix for handling transitions specified in Universal Time
3435 Some "public domain" notices have also been added.
3438 Release code96g - 1996-05-16 14:00:26 -0400
3440 fix for the simultaneous-DST-and-zone-change challenge
3443 Release data96h - 1996-05-09 17:40:51 -0400
3445 changes by Paul Eggert
3448 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3449 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3451 The changes get us some of the way to fixing the problems noted in Paul
3452 Eggert's letter yesterday (in addition to a few others). The approach
3453 has been to make zic a bit smarter about figuring out what time zone
3454 abbreviations apply just after the time specified in the "UNTIL" part
3455 of a zone line. Putting the smarts in zic means avoiding having
3456 transition times show up in both "Zone" lines and "Rule" lines, which
3457 in turn avoids multiple transition time entries in time zone files.
3458 (This also makes the zic input files such as "europe" a bit shorter and
3459 should ease maintenance.)
3462 Release data96f - 1996-04-19 19:20:03 -0000
3463 [tzdata96f.tar.gz is missing!]
3465 The only changes are to the "northamerica" file; the time zone
3466 abbreviation for Denver is corrected to MST (and MDT), and the
3467 comments for Mexico have been updated.
3470 Release data96e - 1996-03-19 17:37:26 -0500
3472 Proposals by Paul Eggert, in particular the Portugal change that
3473 comes into play at the end of this month.
3476 Release data96d - 1996-03-18 20:49:39 -0500
3481 Release code96e - 1996-02-29 15:43:27 -0000
3482 [tzcode96e.tar.gz is missing!]
3484 internationalization changes and the fix to the documentation for strftime
3487 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3489 The "code" file simply updates Bob Kridle's electronic address.
3491 The "data" file updates rules for Mexico.
3494 Release data96b - 1996-01-27 15:44:42 -0500
3499 Release code96c - 1996-01-16 16:58:15 -0500
3501 leap-year streamlining and binary-search changes
3506 Release code96b - 1996-01-10 20:42:39 -0500
3508 fixes and enhancements from Paul Eggert, including code that
3509 emulates the behavior of recent versions of the SunOS "date"
3513 Release 96a - 1996-01-06 09:08:24 -0500
3517 fixes to strftime.c for correct ISO 8601 week number generation,
3518 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3519 numbers (which are not necessarily the same as calendar year numbers)
3522 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3524 The latest revisions from Paul Eggert are included, the usno1995
3525 file has been updated, and a new file ("WWW") covering useful URLs
3529 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3531 A simplification of a macro definition, a change to data for Sudan,
3532 and (for last minute shoppers) notes in the "Music" file on the CD
3536 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3538 (slightly reformatted) 8-bit-clean proposed patch
3540 minor patch: US/Eastern -> America/New_York
3542 snapshot of the USNO's latest data ("usno1995")
3544 some other minor cleanups
3547 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3548 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3552 support for 64-bit time_t's
3554 optimization in localtime.c
3557 Release code95e - 1995-10-13 13:23:57 -0400
3559 the mktime change to scan from future to past when trying to find time zone
3563 Release data95i - 1995-09-26 10:43:26 -0400
3565 For Canada/Central, guess that the Sun customer's "one week too
3566 early" was just a approximation, and the true error is one month
3567 too early. This is consistent with the rest of Canada.
3570 Release data95h - 1995-09-21 11:26:48 -0400
3572 latest changes from Paul Eggert
3575 Release code95d - 1995-09-14 11:14:45 -0400
3577 the addition of a "Music" file, which documents four recorded
3578 versions of the tune "Save That Time".
3581 Release data95g - 1995-09-01 17:21:36 -0400
3583 "yearistype" correction
3586 Release data95f - 1995-08-28 20:46:56 -0400
3588 Paul Eggert's change to the australasia file
3591 Release data95e - 1995-07-08 18:02:34 -0400
3593 The only change is a leap second at the end of this year.
3594 Thanks to Bradley White for forwarding news on the leap second.
3597 Release data95d - 1995-07-03 13:26:22 -0400
3599 Paul Eggert's changes
3602 Release data95c - 1995-07-02 19:19:28 -0400
3604 changes to "asia", "backward", "europe", and "southamerica"
3605 (read: northamericacentrics need not apply)
3608 Release code95c - 1995-03-13 14:00:46 -0500
3610 one-line fix for sign extension problems in detzcode
3613 Release 95b - 1995-03-04 11:22:38 -0500
3615 Minor changes in both:
3617 The "code" file contains a workaround for the lack of "unistd.h" in
3618 Microsoft C++ version 7.
3620 The "data" file contains a fixed "Link" for America/Shiprock.
3623 Release 94h - 1994-12-10 12:51:14 -0500
3627 * incorporate the changes to "zdump" and "date" to make changes to
3628 the "TZ" environment variable permanent;
3630 * incorporate the table changes by Paul Eggert;
3632 * include (and document) support for universal time specifications in
3633 data files - but do not (yet) include use of this feature in the
3636 Think of this as "TZ Classic" - the software has been set up not to break if
3637 universal time shows up in its input, and data entries have been
3638 left as is so as not to break existing implementations.
3641 Release data94f - 1994-08-20 12:56:09 -0400
3643 (with thanks!) the latest data updates from Paul Eggert
3646 Release data94e - 1994-06-04 13:13:53 -0400
3651 Release code94g - 1994-05-05 12:14:07 -0400
3653 fix missing "optind.c" and a reference to it in the Makefile
3656 Release code94f - 1994-05-05 13:00:33 -0000
3657 [tzcode94f.tar.gz is missing!]
3659 changes to avoid overflow in difftime, as well as changes to cope
3660 with the 52/53 challenge in strftime
3663 Release code94e - 1994-03-30 23:32:59 -0500
3665 change for the benefit of PCTS
3668 Release 94d - 1994-02-24 15:42:25 -0500
3670 Avoid clashes with POSIX semantics for zones such as GMT+4.
3672 Some other very minor housekeeping is also present.
3675 Release code94c - 1994-02-10 08:52:40 -0500
3677 Fix bug where mkdirs was broken unless you compile with
3678 -fwritable-strings (which is generally losing to do).
3681 Release 94b - 1994-02-07 10:04:33 -0500
3683 work by Paul Eggert who notes:
3685 I found another book of time zone histories by E W Whitman; it's not
3686 as extensive as Shanks but has a few goodies of its own. I used it
3687 to update the tables. I also fixed some more as a result of
3688 correspondence with Adam David and Peter Ilieve, and move some stray
3689 links from 'europe' to 'backward'. I corrected some scanning errors
3692 As far as the code goes, I fixed zic to allow years in the range
3693 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3694 And I cleaned up the zic documentation a little bit.
3697 Release data94a - 1994-02-03 08:58:54 -0500
3699 It simply incorporates the recently announced leap second into the
3703 Release 93g - 1993-11-22 17:28:27 -0500
3705 Paul Eggert has provided a good deal of historic information (based
3706 on Shanks), and there are some code changes to deal with the buglets
3707 that crawled out in dealing with the new information.
3710 Release 93f - 1993-10-15 12:27:46 -0400
3712 Paul Eggert's changes
3715 Release 93e - 1993-09-05 21:21:44 -0400
3717 This has updated data for Israel, England, and Kwajalein. There's
3718 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3719 Thanks to Paul Eggert and Peter Ilieve for the changes.
3722 Release 93d - 1993-06-17 23:34:17 -0400
3724 new fix and new data on Israel
3727 Release 93c - 1993-06-06 19:31:55 -0400
3732 Release 93b - 1993-02-02 14:53:58 -0500
3734 updated "leapseconds" file
3737 Release 93 - 1993-01-08 07:01:06 -0500
3739 At kre's suggestion, the package has been split in two - a code piece
3740 (which also includes documentation) that's only of use to folks who
3741 want to recompile things and a data piece useful to anyone who can
3744 The new version has a few changes to the data files, a few
3745 portability changes, and an off-by-one fix (with thanks to
3746 Tom Karzes at deshaw.com for providing a description and a
3750 Release 92c - 1992-11-21 17:35:36 -0000
3751 [tz92c.tar.Z is missing!]
3753 The fallout from the latest round of DST transitions.
3755 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3756 there's also a change to "zic.c" that makes it portable to more systems.
3759 Release 92 - 1992-04-25 18:17:03 -0000
3760 [tz92.tar.Z is missing!]
3762 By popular demand (well, at any rate, following a request by kre at munnari)
3765 The 1989 update of the time zone package featured:
3767 * POSIXization (including interpretation of POSIX-style TZ environment
3768 variables, provided by Guy Harris),
3769 * ANSIfication (including versions of "mktime" and "difftime"),
3770 * SVIDulation (an "altzone" variable)
3771 * MACHination (the "gtime" function)
3772 * corrections to some time zone data (including corrections to the rules
3773 for Great Britain and New Zealand)
3774 * reference data from the United States Naval Observatory for folks who
3775 want to do additional time zones
3776 * and the 1989 data for Saudi Arabia.
3778 (Since this code will be treated as "part of the implementation" in some
3779 places and as "part of the application" in others, there's no good way to
3780 name functions, such as timegm, that are not part of the proposed ANSI C
3781 standard; such functions have kept their old, underscore-free names in this
3784 And the "dysize" function has disappeared; it was present to allow
3785 compilation of the "date" command on old BSD systems, and a version of "date"
3786 is now provided in the package. The "date" command is not created when you
3787 "make all" since it may lack options provided by the version distributed with
3788 your operating system, or may not interact with the system in the same way
3789 the native version does.
3791 Since POSIX frowns on correct leap second handling, the default behavior of
3792 the "zic" command (in the absence of a "-L" option) has been changed to omit
3793 leap second information from its output files.
3799 This file contains copies of the part of each release announcement
3800 that talks about the changes in that release. The text has been
3801 adapted and reformatted for the purposes of this file.
3803 Traditionally a release R consists of a pair of tarball files,
3804 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3805 code2010a, data2012c) consist of just one or the other tarball, and a
3806 few (e.g., code2012c-data2012d) have tarballs with mixed version
3807 numbers. Recent releases also come in an experimental format
3808 consisting of a single tarball tzdb-R.tar.lz with extra data.
3810 Release time stamps are taken from the release's commit (for newer,
3811 Git-based releases), from the newest file in the tarball (for older
3812 releases, where this info is available) or from the email announcing
3813 the release (if all else fails; these are marked with a time zone of
3814 -0000 and an "is missing!" comment).
3816 Earlier versions of the code and data were not announced on the tz
3817 list and are not summarized here.
3819 This file is in the public domain.