1 News for the tz database
3 Release 2016h - 2016-10-19 23:17:57 -0700
5 Changes to future time stamps
7 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
8 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
9 future fall transitions will be on the last Saturday of October
10 at 01:00, which is consistent with predicted spring transitions
11 on the last Saturday of March. (Thanks to Tim Parenti.)
13 Changes to past time stamps
15 In Turkey, transitions in 1986-1990 were at 01:00 standard time
16 not at 02:00, and the spring 1994 transition was on March 20, not
17 March 27. (Thanks to Kıvanç Yazan.)
19 Changes to past and future time zone abbreviations
21 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
22 instead of alphabetic ones like "IST" and "LKT". Various
23 English-language sources use "IST", "LKT" and "SLST", with no
24 working consensus. (Usage of "SLST" mentioned by Sadika
29 zic no longer mishandles relativizing file names when creating
30 symbolic links like /etc/localtime, when these symbolic links
31 are outside the usual directory hierarchy. This fixes a bug
32 introduced in 2016g. (Problem reported by Andreas Stieger.)
34 Changes to build procedure
36 New rules 'traditional_tarballs' and 'traditional_signatures' for
37 building just the traditional-format distribution. (Requested by
40 The file 'version' is now put into the tzdata tarball too.
41 (Requested by Howard Hinnant.)
43 Changes to documentation and commentary
45 The 'Theory' file now has a section on interface stability.
46 (Requested by Paul Koning.) It also mentions features like
47 tm_zone and localtime_rz that have long been supported by the
50 tz-link.htm has improved coverage of time zone boundaries suitable
51 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
54 The US commentary now mentions Allen and the "day of two noons".
56 The Fiji commentary mentions the government's 2016-10-03 press
57 release. (Thanks to Raymond Kumar.)
60 Release 2016g - 2016-09-13 08:56:38 -0700
62 Changes to future time stamps
64 Turkey switched from EET/EEST (+02/+03) to permanent +03,
65 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
66 than an invented abbreviation for the new time.
68 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
69 (Thanks to Tim Parenti.)
71 Changes to past time stamps
73 For America/Los_Angeles, spring-forward transition times have been
74 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
77 For zones using Soviet time on 1919-07-01, transitions to UT-based
78 time were at 00:00 UT, not at 02:00 local time. The affected
79 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
80 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
82 Changes to past and future time zone abbreviations
84 The Factory zone now uses the time zone abbreviation -00 instead
85 of a long English-language string, as -00 is now the normal way to
86 represent an undefined time zone.
88 Several zones in Antarctica and the former Soviet Union, along
89 with zones intended for ships at sea that cannot use POSIX TZ
90 strings, now use numeric time zone abbreviations instead of
91 invented or obsolete alphanumeric abbreviations. The affected
92 zones are Antarctica/Casey, Antarctica/Davis,
93 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
94 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
95 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
96 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
97 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
98 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
99 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
100 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
101 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
102 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
103 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
104 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
105 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
106 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
107 was replaced by +05, whereas MSK and MSD were kept as they are not
108 our invention and are widely used.
110 Changes to zone names
112 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
113 (Thanks to David Massoud.)
117 zic no longer generates binary files containing POSIX TZ-like
118 strings that disagree with the local time type after the last
119 explicit transition in the data. This fixes a bug with
120 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
121 stamps on the reference platform. (Thanks to Alexander Belopolsky
122 for reporting the bug and suggesting a way forward.)
124 If the installed localtime and/or posixrules files are symbolic
125 links, zic now keeps them symbolic links when updating them, for
126 compatibility with platforms like OpenSUSE where other programs
127 configure these files as symlinks.
129 zic now avoids hard linking to symbolic links, avoids some
130 unnecessary mkdir and stat system calls, and uses shorter file
133 zdump has a new -i option to generate transitions in a
134 more-compact but still human-readable format. This option is
135 experimental, and the output format may change in future versions.
136 (Thanks to Jon Skeet for suggesting that an option was needed,
137 and thanks to Tim Parenti and Chris Rovick for further comments.)
139 Changes to build procedure
141 An experimental distribution format is available, in addition
142 to the traditional format which will continue to be distributed.
143 The new format is a tarball tzdb-VERSION.tar.lz with signature
144 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
145 tzdb-VERSION containing the code and data of the traditional
146 two-tarball format, along with extra data that may be useful.
147 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
148 for comments about the experimental format.)
150 The release version number is now more accurate in the usual case
151 where releases are built from a Git repository. For example, if
152 23 commits and some working-file changes have been made since
153 release 2016g, the version number is now something like
154 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
155 Official releases uses the same version number format as before,
156 e.g., '2016g'. To support the more-accurate version number, its
157 specification has moved from a line in the Makefile to a new
158 source file 'version'.
160 The experimental distribution contains a file to2050.tzs that
161 contains what should be the output of 'zdump -i -c 2050' on
162 primary zones. If this file is available, 'make check' now checks
163 that zdump generates this output.
165 'make check_web' now works on Fedora-like distributions.
167 Changes to documentation and commentary
169 tzfile.5 now documents the new restriction on POSIX TZ-like
170 strings that is now implemented by zic.
172 Comments now cite URLs for some 1917-1921 Russian DST decrees.
173 (Thanks to Alexander Belopolsky.)
175 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
176 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
177 description of Java 8 has been brought up to date (thanks to
178 Stephen Colebourne). Its description of local time on Mars has
179 been updated to match current practice, and URLs have been updated
180 and some obsolete ones removed.
183 Release 2016f - 2016-07-05 16:26:51 +0200
185 Changes affecting future time stamps
187 The Egyptian government changed its mind on short notice, and
188 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
189 (Thanks to Mina Samuel.)
191 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
192 (Thanks to Stepan Golosunov.)
194 Changes to past and future time stamps
196 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
197 abbreviations instead of invented ones.
199 Changes affecting past time stamps
201 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
202 (Thanks to Stepan Golosunov.)
205 Release 2016e - 2016-06-14 08:46:16 -0700
207 Changes affecting future time stamps
209 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
210 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
211 For future years, guess April's last Thursday to October's last
212 Thursday except for Ramadan.
214 Changes affecting past time stamps
216 Locations while uninhabited now use '-00', not 'zzz', as a
217 placeholder time zone abbreviation. This is inspired by Internet
218 RFC 3339 and is more consistent with numeric time zone
219 abbreviations already used elsewhere. The change affects several
220 arctic and antarctic locations, e.g., America/Cambridge_Bay before
221 1920 and Antarctica/Troll before 2005.
223 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
224 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
228 zic now outputs a dummy transition at time 2**31 - 1 in zones
229 whose POSIX-style TZ strings contain a '<'. This mostly works
230 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
231 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
233 Changes affecting documentation and commentary
235 tz-link.htm says why governments should give plenty of notice for
236 time zone or DST changes, and refers to Matt Johnson's blog post.
238 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
241 Release 2016d - 2016-04-17 22:50:29 -0700
243 Changes affecting future time stamps
245 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
246 (Thanks to Alexander Krivenyshev for the heads-up.)
248 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
249 (Thanks to Alexander Krivenyshev and Matt Johnson.)
251 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
252 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
253 at 02:00. (Thanks to Stepan Golosunov.)
255 Changes affecting past time stamps
257 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
258 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
259 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
260 the same change. (Thanks to Stepan Golosunov.)
262 Russia and nearby locations had daylight-saving transitions on
263 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
264 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
267 Many corrections to historical time in Kazakhstan from 1991
268 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
269 invented time zone abbreviations with numeric abbreviations.
271 Changes to commentary
273 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
276 Release 2016c - 2016-03-23 00:51:27 -0700
278 Changes affecting future time stamps
280 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
282 Chile reverts from permanent to seasonal DST. (Thanks to Juan
283 Correa for the heads-up, and to Tim Parenti for corrections.)
284 Guess that future transitions are August's and May's second
285 Saturdays at 24:00 mainland time. Also, call the period from
286 2014-09-07 through 2016-05-14 daylight saving time instead of
287 standard time, as that seems more appropriate now.
289 Changes affecting past time stamps
291 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
292 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
293 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
294 (Thanks to Stepan Golosunov.)
296 Changes to commentary
298 Several updates and URLs for historical and proposed Russian changes.
299 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
302 Release 2016b - 2016-03-12 17:30:14 -0800
306 Starting with release 2016b, some data entries cause zic implementations
307 derived from tz releases 2005j through 2015e to issue warnings like
308 "time zone abbreviation differs from POSIX standard (+03)".
309 These warnings should not otherwise affect zic's output and can safely be
310 ignored on today's platforms, as the warnings refer to a restriction in
311 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
312 warnings is to upgrade to zic derived from tz releases 2015f and later.
314 Changes affecting future time stamps
316 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
317 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
318 2016-03-27 at 02:00 local time. They need distinct zones since their
319 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
320 Altai Republic, Russia, which will switch from +06 to +07 on the same date
321 and local time. The Astrakhan change is already official; the others have
322 passed the first reading in the State Duma and are extremely likely.
323 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
324 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
325 and Stepan Golosunov for followup.)
327 As a trial of a new system that needs less information to be made up,
328 the new zones use numeric time zone abbreviations like "+04"
329 instead of invented abbreviations like "ASTT".
331 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
334 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
335 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
336 Saturday at 01:00, not March's last Friday at 24:00.
338 Changes affecting past time stamps
340 Europe/Chisinau observed DST during 1990, and switched from +04 to
341 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
342 (Thanks to Stepan Golosunov.)
344 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
345 KUYT/KUYST. (Thanks to Stepan Golosunov.)
349 tzselect's diagnostics and checking, and checktab.awk's checking,
350 have been improved. (Thanks to J William Piggott.)
352 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
354 tzselect now tests Julian-date TZ settings more accurately.
355 (Thanks to J William Piggott.)
357 Changes to commentary
359 Comments in zone tables have been improved. (Thanks to J William Piggott.)
361 tzselect again limits its menu comments so that menus fit on a
362 24x80 alphanumeric display.
364 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
366 In the Theory file, the description of possible time zone abbreviations in
367 tzdata has been cleaned up, as the old description was unclear and
368 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
371 Release 2016a - 2016-01-26 23:28:02 -0800
373 Changes affecting future time stamps
375 America/Cayman will not observe daylight saving this year after all.
376 Revert our guess that it would. (Thanks to Matt Johnson.)
378 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
379 (Thanks to Alexander Krivenyshev.)
381 Asia/Tehran now has DST predictions for the year 2038 and later,
382 to be March 21 00:00 to September 21 00:00. This is likely better
383 than predicting no DST, albeit off by a day every now and then.
385 Changes affecting past and future time stamps
387 America/Metlakatla switched from PST all year to AKST/AKDT on
388 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
390 America/Santa_Isabel has been removed, and replaced with a
391 backward compatibility link to America/Tijuana. Its contents were
392 apparently based on a misreading of Mexican legislation.
394 Changes affecting past time stamps
396 Asia/Karachi's two transition times in 2002 were off by a minute.
397 (Thanks to Matt Johnson.)
399 Changes affecting build procedure
401 An installer can now combine leap seconds with use of the backzone file,
402 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
403 The old 'make posix_packrat' rule is now marked as obsolescent.
404 (Thanks to Ian Abbott for an initial implementation.)
406 Changes affecting documentation and commentary
408 A new file LICENSE makes it easier to see that the code and data
409 are mostly public-domain. (Thanks to James Knight.) The three
410 non-public-domain files now use the current (3-clause) BSD license
411 instead of older versions of that license.
413 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
414 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
415 on editing tz source files (with a mention of Sublime zoneinfo,
416 thanks to Gilmore Davidson).
418 The Theory and asia files now mention the 2015 book "The Global
419 Transformation of Time, 1870-1950", and cite a couple of reviews.
421 The America/Chicago entry now documents the informal use of US
422 central time in Fort Pierre, South Dakota. (Thanks to Rick
423 McDermid, Matt Johnson, and Steve Jones.)
426 Release 2015g - 2015-10-01 00:39:51 -0700
428 Changes affecting future time stamps
430 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
433 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
434 (Thanks to Alexander Krivenyshev.)
436 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
437 (Thanks to Ken Rylander.)
439 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
440 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
441 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
443 Changes affecting past time stamps
445 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
447 Changes affecting code
449 localtime no longer mishandles America/Anchorage after 2037.
450 (Thanks to Bradley White for reporting the bug.)
452 On hosts with signed 32-bit time_t, localtime no longer mishandles
453 Pacific/Fiji after 2038-01-16 14:00 UTC.
455 The localtime module allows the variables 'timezone', 'daylight',
456 and 'altzone' to be in common storage shared with other modules,
457 and declares them in case the system <time.h> does not.
458 (Problems reported by Kees Dekker.)
460 On platforms with tm_zone, strftime.c now assumes it is not NULL.
461 This simplifies the code and is consistent with zdump.c.
462 (Problem reported by Christos Zoulas.)
464 Changes affecting documentation
466 The tzfile man page now documents that transition times denote the
467 starts (not the ends) of the corresponding time periods.
468 (Ambiguity reported by Bill Seymour.)
471 Release 2015f - 2015-08-10 18:06:56 -0700
473 Changes affecting future time stamps
475 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
476 The abbreviation remains "KST". (Thanks to Robert Elz.)
478 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
481 Changes affecting past and future time stamps
483 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
484 (Thanks to Roman Tudos.)
486 Changes affecting data format and code
488 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
489 field of a Rule line should now be '-'; the old values 'even',
490 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
491 Although the implementation has not changed, these features do not
492 work in the default installation, they are not used in the data,
493 and they are now considered obsolescent.
495 zic now checks that two rules don't take effect at the same time.
496 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
497 simultaneity are now documented.
499 The two characters '%z' in a zone format now stand for the UTC
500 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
501 five hours and thirty minutes ahead. This better supports time
502 zone abbreviations conforming to POSIX.1-2001 and later.
504 Changes affecting installed data files
506 Comments for America/Halifax and America/Glace_Bay have been improved.
507 (Thanks to Brian Inglis.)
509 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
510 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
511 installed data files for Europe/Simferopol and Europe/Tallinn.
512 It does not affect timestamps. (Thanks to Howard Hinnant.)
514 Changes affecting code
516 zdump and zic no longer warn about valid time zone abbreviations
519 Some Visual Studio 2013 warnings have been suppressed.
520 (Thanks to Kees Dekker.)
522 'date' no longer sets the time of day and its -a, -d, -n and -t
523 options have been removed. Long obsolescent, the implementation
524 of these features had porting problems. Builders no longer need
525 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
526 (Thanks to Kees Dekker for pointing out the problem.)
528 Changes affecting documentation
530 The Theory file mentions naming issues earlier, as these seem to be
531 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
533 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
535 Mention that Herbert Samuel introduced the term "Summer Time".
538 Release 2015e - 2015-06-13 10:56:02 -0700
540 Changes affecting future time stamps
542 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
543 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
545 Assume Cayman Islands will observe DST starting next year, using US rules.
546 Although it isn't guaranteed, it is the most likely.
548 Changes affecting data format
550 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
551 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
553 Changes affecting code
555 When displaying data, tzselect converts it to the current locale's
556 encoding if the iconv command works. (Problem reported by random832.)
558 tzselect no longer mishandles Dominica, fixing a bug introduced
559 in Release 2014f. (Problem reported by Owen Leibman.)
561 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
562 This fixes a bug introduced in Release 2014f.
563 (Problem reported by Leonardo Chiquitto.)
566 Release 2015d - 2015-04-24 08:09:46 -0700
568 Changes affecting future time stamps
570 Egypt will not observe DST in 2015 and will consider canceling it
571 permanently. For now, assume no DST indefinitely.
572 (Thanks to Ahmed Nazmy and Tim Parenti.)
574 Changes affecting past time stamps
576 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
577 1966-07-01. Also, Yukon's time zone history is documented better.
578 (Thanks to Brian Inglis and Dennis Ferguson.)
580 Change affecting past and future time zone abbreviations
582 The abbreviations for Hawaii-Aleutian standard and daylight times
583 have been changed from HAST/HADT to HST/HDT, as per US Government
584 Printing Office style. This affects only America/Adak since 1983,
585 as America/Honolulu was already using the new style.
587 Changes affecting code
589 zic has some minor performance improvements.
592 Release 2015c - 2015-04-11 08:55:55 -0700
594 Changes affecting future time stamps
596 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
597 not 00:00 on April's last Friday. 2015's transition will therefore be on
598 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
599 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
601 Changes affecting past time stamps
603 The following changes affect some pre-1991 Chile-related time stamps
604 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
606 The 1910 transition was January 10, not January 1.
608 The 1918 transition was September 10, not September 1.
610 The UT -04 time observed from 1932 to 1942 is now considered to
611 be standard time, not year-round DST.
613 Santiago observed DST (UT -03) from 1946-07-15 through
614 1946-08-31, then reverted to standard time, then switched to -05
617 Assume transitions before 1968 were at 00:00, since we have no data
620 The spring 1988 transition was 1988-10-09, not 1988-10-02.
621 The fall 1990 transition was 1990-03-11, not 1990-03-18.
623 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
624 and omit all transitions on Pacific/Easter from 1942 through 1946
625 since we have no data suggesting that they existed.
627 One more zone has been turned into a link, as it differed
628 from an existing zone only for older time stamps. As usual,
629 this change affects UTC offsets in pre-1970 time stamps only.
630 The zone's old contents have been moved to the 'backzone' file.
631 The affected zone is America/Montreal.
633 Changes affecting commentary
635 Mention the TZUpdater tool.
637 Mention "The Time Now". (Thanks to Brandon Ramsey.)
640 Release 2015b - 2015-03-19 23:28:11 -0700
642 Changes affecting future time stamps
644 Mongolia will start observing DST again this year, from the last
645 Saturday in March at 02:00 to the last Saturday in September at 00:00.
646 (Thanks to Ganbold Tsagaankhuu.)
648 Palestine will start DST on March 28, not March 27. Also,
649 correct the fall 2014 transition from September 26 to October 24.
650 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
652 Changes affecting past time stamps
654 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
655 regression. (Thanks to Stuart Bishop for reporting the problem.)
657 Some more zones have been turned into links, when they differed
658 from existing zones only for older time stamps. As usual,
659 these changes affect UTC offsets in pre-1970 time stamps only.
660 Their old contents have been moved to the 'backzone' file.
661 The affected zones are: America/Antigua, America/Cayman,
662 Pacific/Midway, and Pacific/Saipan.
664 Changes affecting time zone abbreviations
666 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
669 Changes affecting code
671 Fix integer overflow bug in reference 'mktime' implementation.
672 (Problem reported by Jörg Richter.)
674 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
675 to be used in the same executable as standard-library time_t functions.
676 (Problems reported by Bradley White.)
678 Changes affecting commentary
680 Cite the recent Mexican decree changing Quintana Roo's time zone.
681 (Thanks to Carlos Raúl Perasso.)
683 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
685 Update info about Mars time.
688 Release 2015a - 2015-01-29 22:35:20 -0800
690 Changes affecting future time stamps
692 The Mexican state of Quintana Roo, represented by America/Cancun,
693 will shift from Central Time with DST to Eastern Time without DST
694 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
696 Chile will not change clocks in April or thereafter; its new standard time
697 will be its old daylight saving time. This affects America/Santiago,
698 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
700 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
701 (Thanks to Tim Parenti.)
703 Changes affecting past time stamps
705 Iceland observed DST in 1919 and 1921, and its 1939 fallback
706 transition was Oct. 29, not Nov. 29. Remove incorrect data from
707 Shanks about time in Iceland between 1837 and 1908.
709 Some more zones have been turned into links, when they differed
710 from existing zones only for older time stamps. As usual,
711 these changes affect UTC offsets in pre-1970 time stamps only.
712 Their old contents have been moved to the 'backzone' file.
713 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
716 Changes affecting code
718 tzalloc now scrubs time zone abbreviations compatibly with the way
719 that tzset always has, by replacing invalid bytes with '_' and by
720 shortening too-long abbreviations.
722 tzselect ports to POSIX awk implementations, no longer mishandles
723 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
724 settings to the user. (Thanks to Stefan Kuhn.)
726 Changes affecting build procedure
728 'make check' now checks for links to links in the data.
729 One such link (for Africa/Asmera) has been fixed.
730 (Thanks to Stephen Colebourne for pointing out the problem.)
732 Changes affecting commentary
734 The leapseconds file commentary now mentions the expiration date.
735 (Problem reported by Martin Burnicki.)
737 Update Mexican Library of Congress URL.
740 Release 2014j - 2014-11-10 17:37:11 -0800
742 Changes affecting current and future time stamps
744 Turks & Caicos' switch from US eastern time to UT -04 year-round
745 did not occur on 2014-11-02 at 02:00. It's currently scheduled
746 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
748 Changes affecting past time stamps
750 Many pre-1989 time stamps have been corrected for Asia/Seoul and
751 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
752 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
753 longer guess that Pyongyang mimicked Seoul time after World War II,
754 as this is politically implausible.
756 Some more zones have been turned into links, when they differed
757 from existing zones only for older time stamps. As usual,
758 these changes affect UTC offsets in pre-1970 time stamps only.
759 Their old contents have been moved to the 'backzone' file.
760 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
761 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
762 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
765 Changes affecting commentary
767 The commentary is less enthusiastic about Shanks as a source,
768 and is more careful to distinguish UT from UTC.
771 Release 2014i - 2014-10-21 22:04:57 -0700
773 Changes affecting future time stamps
775 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
776 (Thanks to Ken Rylander for the heads-up.) Guess that future
777 years will use a similar pattern.
779 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
780 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
781 (Thanks to Kiley Walbom for the heads-up.)
783 Changes affecting time zone abbreviations
785 Since Belarus is not changing its clocks even though Moscow is,
786 the time zone abbreviation in Europe/Minsk is changing from FET
787 to its more-traditional value MSK on 2014-10-26 at 01:00.
788 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
790 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
791 Indochina, to distinguish it better from ICT (+07).
793 Changes affecting past time stamps
795 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
796 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
797 authoritative book). Asia/Ho_Chi_Minh has been added to
798 zone1970.tab, to give tzselect users in Vietnam two choices,
799 since north and south Vietnam disagreed after our 1970 cutoff.
801 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
802 they differed from existing zones only for older time stamps. As
803 usual, these changes affect pre-1970 time stamps only. Their old
804 contents have been moved to the 'backzone' file.
806 Changes affecting code
808 The time-related library functions now set errno on failure, and
809 some crashes in the new tzalloc-related library functions have
810 been fixed. (Thanks to Christos Zoulas for reporting most of
811 these problems and for suggesting fixes.)
813 If USG_COMPAT is defined and the requested time stamp is standard time,
814 the tz library's localtime and mktime functions now set the extern
815 variable timezone to a value appropriate for that time stamp; and
816 similarly for ALTZONE, daylight saving time, and the altzone variable.
817 This change is a companion to the tzname change in 2014h, and is
818 designed to make timezone and altzone more compatible with tzname.
820 The tz library's functions now set errno to EOVERFLOW if they fail
821 because the result cannot be represented. ctime and ctime_r now
822 return NULL and set errno when a time stamp is out of range, rather
823 than having undefined behavior.
825 Some bugs associated with the new 2014g functions have been fixed.
826 This includes a bug that largely incapacitated the new functions
827 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
828 It also includes some uses of uninitialized variables after tzalloc.
829 The new code uses the standard type 'ssize_t', which the Makefile
830 now gives porting advice about.
832 Changes affecting commentary
834 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
837 Release 2014h - 2014-09-25 18:59:03 -0700
839 Changes affecting past time stamps
841 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
843 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
844 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
846 Some more zones have been turned into links, when they differed
847 from existing zones only for older time stamps. As usual,
848 these changes affect UTC offsets in pre-1970 time stamps only.
849 Their old contents have been moved to the 'backzone' file.
850 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
851 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
852 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
854 Changes affecting code
856 zdump -V and -v now output gmtoff= values on all platforms,
857 not merely on platforms defining TM_GMTOFF.
859 The tz library's localtime and mktime functions now set tzname to a value
860 appropriate for the requested time stamp, and zdump now uses this
861 on platforms not defining TM_ZONE, fixing a 2014g regression.
862 (Thanks to Tim Parenti for reporting the problem.)
864 The tz library no longer sets tzname if localtime or mktime fails.
866 zdump -c no longer mishandles transitions near year boundaries.
867 (Thanks to Tim Parenti for reporting the problem.)
869 An access to uninitialized data has been fixed.
870 (Thanks to Jörg Richter for reporting the problem.)
872 When THREAD_SAFE is defined, the code ports to the C11 memory model.
873 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
874 and two threads race to initialize data used by gmtime-like functions.
875 (Thanks to Andy Heninger for reporting the problems.)
877 Changes affecting build procedure
879 'make check' now checks better for properly-sorted data.
881 Changes affecting documentation and commentary
883 zdump's gmtoff=N output is now documented, and its isdst=D output
884 is now documented to possibly output D values other than 0 or 1.
886 zdump -c's treatment of years is now documented to use the
887 Gregorian calendar and Universal Time without leap seconds,
888 and its behavior at cutoff boundaries is now documented better.
889 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
891 Programs are now documented to use the proleptic Gregorian calendar.
892 (Thanks to Alan Barrett for the suggestion.)
894 Fractional-second GMT offsets have been documented for civil time
895 in 19th-century Chennai, Jakarta, and New York.
898 Release 2014g - 2014-08-28 12:31:23 -0700
900 Changes affecting future time stamps
902 Turks & Caicos is switching from US eastern time to UT -04
903 year-round, modeled as a switch on 2014-11-02 at 02:00.
904 [As noted in 2014j, this switch was later delayed.]
906 Changes affecting past time stamps
908 Time in Russia or the USSR before 1926 or so has been corrected by
909 a few seconds in the following zones: Asia/Irkutsk,
910 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
911 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
912 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
915 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
916 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
917 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
918 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
919 (Thanks to Stephen Colebourne for pointing to the decree.)
921 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
923 A new file 'backzone' contains data which may appeal to
924 connoisseurs of old time stamps, although it is out of scope for
925 the tz database, is often poorly sourced, and contains some data
926 that is known to be incorrect. The new file is not recommended
927 for ordinary use and its entries are not installed by default.
928 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
929 Isle of Man entries.)
931 Some more zones have been turned into links, when they differed
932 from existing zones only for older time stamps. As usual,
933 these changes affect UTC offsets in pre-1970 time stamps only.
934 Their old contents have been moved to the 'backzone' file.
935 The affected zones are: Africa/Bangui, Africa/Brazzaville,
936 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
937 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
939 Changes affecting code
941 Unless NETBSD_INSPIRED is defined to 0, the tz library now
942 supplies functions for creating and using objects that represent
943 time zones. The new functions are tzalloc, tzfree, localtime_rz,
944 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
945 time2posix_z. They are intended for performance: for example,
946 localtime_rz (unlike localtime_r) is trivially thread-safe without
947 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
948 functions, and to Alan Barrett and Jonathan Lennox for helping to
951 zdump now builds with the tz library unless USE_LTZ is defined to 0,
952 This lets zdump use tz features even if the system library lacks them.
953 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
954 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
956 zdump now uses localtime_rz if available, as it's significantly faster,
957 and it can help zdump better diagnose invalid time zone names.
958 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
959 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
960 not available, zdump now uses localtime_r and tzset if available,
961 as this is a bit cleaner and faster than plain localtime. Compile
962 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
963 lacks these two functions.
965 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
966 Although not needed for tz's own applications, which are single-threaded,
967 this supports POSIX better if the tz library is used in multithreaded apps.
969 Some crashes have been fixed when zdump or the tz library is given
970 invalid or outlandish input.
972 The tz library no longer mishandles leap seconds on platforms with
973 unsigned time_t in time zones that lack ordinary transitions after 1970.
975 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
976 already defined, to make it easier to configure on common platforms.
977 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
979 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
980 assumes that reading uninitialized memory yields garbage values
981 but does not cause other problems such as traps.
983 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
984 more likely to guess right for ambiguous time stamps near
985 transitions where tm_isdst does not change.
987 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
988 strftime_l for compatibility with recent versions of POSIX.
989 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
990 to 1 on recent POSIX versions, and to 0 otherwise.
992 tzselect -c now uses a hybrid distance measure that works better
993 in Africa. (Thanks to Alan Barrett for noting the problem.)
995 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
996 or when time_tz is defined.
998 When HAVE_UTMPX_H is set the 'date' command now builds on systems
999 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1000 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1001 This affects GNU/Linux and similar systems.
1003 For easier maintenance later, some C code has been simplified,
1004 some lint has been removed, and the code has been tweaked so that
1005 plain 'make' is more likely to work.
1007 The C type 'bool' is now used for boolean values, instead of 'int'.
1009 The long-obsolete LOCALE_HOME code has been removed.
1011 The long-obsolete 'gtime' function has been removed.
1013 Changes affecting build procedure
1015 'zdump' no longer links in ialloc.o, as it's not needed.
1017 'make check_time_t_alternatives' no longer assumes GNU diff.
1019 Changes affecting distribution tarballs
1021 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1022 the tzdata tarball instead of the tzcode tarball, since they help
1023 maintain the data. The NEWS and Theory files are now also
1024 distributed in the tzdata tarball, as they're relevant for data.
1025 (Thanks to Alan Barrett for pointing this out.) Also, the
1026 leapseconds.awk file is no longer distributed in the tzcode
1027 tarball, since it belongs in the tzdata tarball (where 2014f
1028 inadvertently also distributed it).
1030 Changes affecting documentation and commentary
1032 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1033 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1036 The man pages have been updated to use function prototypes,
1037 to document thread-safe variants like localtime_r, and to document
1038 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1041 The fields in Link lines have been renamed to be more descriptive
1042 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1043 and LINK-TO has become LINK-NAME.
1045 tz-link.htm mentions the IETF's tzdist working group; Windows
1046 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1048 Some broken URLs have been fixed in the commentary. (Thanks to
1051 Commentary about Philippines DST has been updated, and commentary
1052 on pre-1970 time in India has been added.
1055 Release 2014f - 2014-08-05 17:42:36 -0700
1057 Changes affecting future time stamps
1059 Russia will subtract an hour from most of its time zones on 2014-10-26
1060 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1061 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1062 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1063 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1064 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1065 (Europe/Samara) are not changing their clocks. The changed zones are
1066 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1067 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1068 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1069 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1070 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1071 but not its UTC offset. Two zones are added: Asia/Chita (split
1072 from Asia/Yakutsk, and also with two hours subtracted) and
1073 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1074 subtracted). (Thanks to Tim Parenti for much of the above.)
1076 Changes affecting time zone abbreviations
1078 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1079 and similarly for the other Australian zones. That is, for eastern
1080 standard and daylight saving time the abbreviations are AEST and AEDT
1081 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1082 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1083 This change does not affect UTC offsets, only time zone abbreviations.
1084 (Thanks to Rich Tibbett and many others.)
1086 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1087 effective 2014-10-26 at 02:00 local time.
1089 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1090 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1092 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1093 Similarly, prefer EET/EEST for eastern European time in Russia.
1095 Change time zone abbreviations in (western) Samoa to use "ST" and
1096 "DT" suffixes, as this is more likely to match common practice.
1097 Prefix "W" to (western) Samoa time when its standard-time offset
1098 disagrees with that of American Samoa.
1100 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1102 Time zone abbreviations have been updated for Japan's two time
1103 zones used 1896-1937. JWST now stands for Western Standard
1104 Time, and JCST for Central Standard Time (formerly this was CJT).
1105 These abbreviations are now used for time in Korea, Taiwan,
1106 and Sakhalin while controlled by Japan.
1108 Changes affecting past time stamps
1110 China's five zones have been simplified to two, since the post-1970
1111 differences in the other three seem to have been imaginary. The
1112 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1113 removed; backwards-compatibility links still work, albeit with
1114 different behaviors for time stamps before May 1980. Asia/Urumqi's
1115 1980 transition to UT +08 has been removed, so that it is now at
1116 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1117 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1119 Some zones have been turned into links, when they differed from existing
1120 zones only for older UTC offsets where data entries were likely invented.
1121 These changes affect UTC offsets in pre-1970 time stamps only. This is
1122 similar to the change in release 2013e, except this time for western
1123 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1124 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1125 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1126 Atlantic/St_Helena. This also affects the backwards-compatibility
1127 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1128 Tim Parenti, and David Patte for reporting problems in earlier
1129 versions of this change.)
1131 Asia/Shanghai's pre-standard-time UT offset has been changed from
1132 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1133 transition to standard time has been changed from 1928 to 1901.
1135 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1136 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1137 In 1946 it observed DST from 05-15 through 09-30; in 1947
1138 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1139 (Thanks to Yu-Cheng Chuang.)
1141 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1143 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1144 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1146 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1147 period from 1911 to 1950.
1149 Pacific/Chatham has been changed to New Zealand standard time plus
1150 45 minutes for the period before 1957, reflecting a 1956 remark in
1151 the New Zealand parliament.
1153 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1154 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1155 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1156 not 04-06 at 02:00; and there was no DST in 1920.
1158 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1160 Time in Russia before 1927 or so has been corrected by a few seconds in
1161 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1162 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1163 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1164 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1166 Changes affecting data format
1168 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1169 The new file's extended format allows multiple country codes per zone.
1170 The older file is still installed but is deprecated; its format is
1171 not changing and it will still be distributed for a while, but new
1172 applications should use the new file.
1174 The new file format simplifies maintenance of obscure locations.
1175 To test this, it adds coverage for the Crozet Islands and the
1176 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1178 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1179 It is still ASCII now, but commentary about the switch has been added.
1180 The new file 'zone1970.tab' already uses UTF-8.
1182 Changes affecting code
1184 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1185 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1187 'zic' no longer mishandles input when ignoring case in locales that
1188 are not compatible with English, e.g., unibyte Turkish locales when
1189 compiled with HAVE_GETTEXT.
1191 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1192 they no longer use ASCII '-' as if it were a dash.
1194 'zic' now rejects output file names that contain '.' or '..' components.
1195 (Thanks to Tim Parenti for reporting the problem.)
1197 'zic -v' now warns about output file names that do not follow
1198 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1199 David Olson for starting the ball rolling on this.)
1201 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1203 Changes affecting build procedure
1205 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1206 (Thanks to John Cochran.)
1208 Changes affecting documentation and commentary
1210 The 'Theory' file documents legacy names, the longstanding
1211 exceptions to the POSIX-inspired file name rules.
1213 The 'zic' documentation clarifies the role of time types when
1214 interpreting dates. (Thanks to Arthur David Olson.)
1216 Documentation and commentary now prefer UTF-8 to US-ASCII,
1217 allowing the use of proper accents in foreign words and names.
1218 Code and data have not changed because of this. (Thanks to
1219 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1222 Non-HTML documentation and commentary now use plain-text URLs instead of
1223 HTML insertions, and are more consistent about bracketing URLs when they
1224 are not already surrounded by white space. (Thanks to suggestions by
1227 There is new commentary about Xujiahui Observatory, the five time-zone
1228 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1229 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1230 warlord Jin Shuren in the data.
1232 Commentary about the coverage of each Russian zone has been standardized.
1233 (Thanks to Tim Parenti).
1235 There is new commentary about contemporary timekeeping in Ethiopia.
1237 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1239 There is new commentary about time in Poland in 1919.
1241 Proper credit has been given to DST inventor George Vernon Hudson.
1243 Commentary about time in Metlakatla, AK and Resolute, NU has been
1244 improved, with a new source for the former.
1246 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1249 Commentary about permanent Antarctic bases has been updated.
1251 Several typos have been corrected. (Thanks to Tim Parenti for
1252 contributing some of these fixes.)
1254 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1255 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1256 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1257 (Thanks to a heads-up from Dirkjan Ochtman.)
1259 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1260 have been removed. These obsolescent US Naval Observatory entries were no
1261 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1264 Release 2014e - 2014-06-12 21:53:52 -0700
1266 Changes affecting near-future time stamps
1268 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1269 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1270 switch to standard time at 24:00 the last Thursday before Ramadan, and
1271 back to DST at 00:00 the first Friday after Ramadan.
1273 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1274 to Milamber Space Network.) Guess that from 2015 on Morocco will
1275 temporarily switch to standard time at 03:00 the last Saturday before
1276 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1278 Changes affecting past time stamps
1280 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1281 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1282 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1283 in 1991. (Thanks to Hank W. for reporting the problems.)
1285 Changes affecting commentary
1287 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1288 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1289 removes stale pointers to World Time Explorer and WORLDTIME.
1292 Release 2014d - 2014-05-27 21:34:40 -0700
1294 Changes affecting code
1296 zic no longer generates files containing time stamps before the Big Bang.
1297 This works around GNOME bug 730332
1298 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1299 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1300 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1302 Changes affecting documentation
1304 tz-link.htm now mentions GNOME.
1307 Release 2014c - 2014-05-13 07:44:13 -0700
1309 Changes affecting near-future time stamps
1311 Egypt observes DST starting 2014-05-15 at 24:00.
1312 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1313 Details have not been announced, except that DST will not be observed
1314 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1315 Morocco, and that Egypt's future spring and fall transitions will be the
1316 same as 2010 when it last observed DST, namely April's last Friday at
1317 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1318 that Ramadan transitions will be at 00:00 standard time.
1320 Changes affecting code
1322 zic now generates transitions for minimum time values, eliminating guesswork
1323 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
1325 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1327 Changes affecting commentary and documentation
1329 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1332 Release 2014b - 2014-03-24 21:28:50 -0700
1334 Changes affecting near-future time stamps
1336 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1337 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1339 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1340 Bengt-Inge Larsson.) This is currently an approximation; a better version
1341 will require the zic and localtime fixes mentioned below, and the plan is
1342 to wait for a while until at least the zic fixes propagate.
1344 Changes affecting code
1346 'zic' and 'localtime' no longer reject locations needing four transitions
1347 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1348 Also, 'zic' avoids some unlikely failures due to integer overflow.
1350 Changes affecting build procedure
1352 'make check' now detects Rule lines defined but never used.
1353 The NZAQ rules, an instance of this problem, have been removed.
1355 Changes affecting commentary and documentation
1357 Fix Tuesday/Thursday typo in description of time in Israel.
1358 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1360 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1361 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1362 library supports them.
1364 Add comments about Johnston Island time in the 1960s.
1365 (Thanks to Lyle McElhaney.)
1367 Morocco's 2014 DST start will be as predicted.
1368 (Thanks to Sebastien Willemijns.)
1371 Release 2014a - 2014-03-07 23:30:29 -0800
1373 Changes affecting near-future time stamps
1375 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1376 the heads-up, and to Tim Parenti for simplifying the update.)
1378 Changes affecting past time stamps
1380 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1381 (Thanks to Steffen Thorsen.)
1383 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1384 (not 1992-01-01), and observed DST during the entire next winter.
1385 (Thanks to Vladimir in Moscow via Alois Treindl.)
1387 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1388 (Thanks to Avigdor Finkelstein.)
1390 Changes affecting code
1392 A uninitialized-storage bug in 'localtime' has been fixed.
1393 (Thanks to Logan Chien.)
1395 Changes affecting the build procedure
1397 The settings for 'make check_web' now default to Ubuntu 13.10.
1399 Changes affecting commentary and documentation
1401 The boundary of the US Pacific time zone is given more accurately.
1402 (Thanks to Alan Mintz.)
1404 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1406 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1408 Better descriptions of countries with same time zone history as
1409 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1411 Several changes affect tz-link.htm, the main web page.
1413 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1416 Mention xCal (Internet RFC 6321) and jCal.
1418 Microsoft has some support for tz database names.
1420 CLDR data formats include both XML and JSON.
1422 Mention Maggiolo's map of solar vs standard time.
1423 (Thanks to Arthur David Olson.)
1425 Mention TZ4Net. (Thanks to Matt Johnson.)
1427 Mention the timezone-olson Haskell package.
1429 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1431 Remove moribund links to daylight-savings-time.info and to
1432 Simple Timer + Clocks.
1434 Update two links. (Thanks to Oscar van Vlijmen.)
1436 Fix some formatting glitches, e.g., remove random newlines from
1437 abbr elements' title attributes.
1440 Release 2013i - 2013-12-17 07:25:23 -0800
1442 Changes affecting near-future time stamps:
1444 Jordan switches back to standard time at 00:00 on December 20, 2013.
1445 The 2006-2011 transition schedule is planned to resume in 2014.
1446 (Thanks to Steffen Thorsen.)
1448 Changes affecting past time stamps:
1450 In 2004, Cuba began DST on March 28, not April 4.
1451 (Thanks to Steffen Thorsen.)
1453 Changes affecting code
1455 The compile-time flag NOSOLAR has been removed, as nowadays the
1456 benefit of slightly shrinking runtime table size is outweighed by the
1457 cost of disallowing potential future updates that exceed old limits.
1459 Changes affecting documentation and commentary
1461 The files solar87, solar88, and solar89 are no longer distributed.
1462 They were a negative experiment - that is, a demonstration that
1463 tz data can represent solar time only with some difficulty and error.
1464 Their presence in the distribution caused confusion, as Riyadh
1465 civil time was generally not solar time in those years.
1467 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1470 Release 2013h - 2013-10-25 15:32:32 -0700
1472 Changes affecting current and future time stamps:
1474 Libya has switched its UT offset back to +02 without DST, instead
1475 of +01 with DST. (Thanks to Even Scharning.)
1477 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1478 (Thanks to Gwillim Law.)
1480 Changes affecting future time stamps:
1482 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1483 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1484 (Thanks to Steffen Thorsen.)
1486 Add entries for DST transitions in Morocco in the year 2038.
1487 This avoids some year-2038 glitches introduced in 2013g.
1488 (Thanks to Yoshito Umaoka for reporting the problem.)
1490 Changes affecting API
1492 The 'tzselect' command no longer requires the 'select' command,
1493 and should now work with /bin/sh on more platforms. It also works
1494 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1495 Patrick 'P. J.' McDermott and Alan Barrett.)
1497 Changes affecting code
1499 Fix localtime overflow bugs with 32-bit unsigned time_t.
1501 zdump no longer assumes sscanf returns maximal values on overflow.
1503 Changes affecting the build procedure
1505 The builder can specify which programs to use, if any, instead of
1506 'ar' and 'ranlib', and libtz.a is now built locally before being
1507 installed. (Thanks to Michael Forney.)
1509 A dependency typo in the 'zdump' rule has been fixed.
1510 (Thanks to Andrew Paprocki.)
1512 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1513 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1515 'make clean' no longer removes 'leapseconds', since it's
1516 host-independent and is part of the distribution.
1518 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1520 Changes affecting documentation and commentary
1522 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1523 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1525 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1526 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1527 longer maintained) and for old advisories. SOFA now does C.
1529 Release 2013g - 2013-09-30 21:08:26 -0700
1531 Changes affecting current and near-future time stamps
1533 Morocco now observes DST from the last Sunday in March to the last
1534 Sunday in October, not April to September respectively. (Thanks
1535 to Steffen Thorsen.)
1537 Changes affecting 'zic'
1539 'zic' now runs on platforms that lack both hard links and symlinks.
1540 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1541 Also, fix some bugs on platforms that lack hard links but have symlinks.
1543 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1544 to predict the far future, fixing a bug introduced in 2013e.
1546 Changes affecting the build procedure
1548 The 'leapseconds' file is again put into the tzdata tarball.
1549 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1550 Matt Burgess and Ian Abbott.) The timestamps of these and other
1551 dependent files in tarballs are adjusted more consistently.
1553 Changes affecting documentation and commentary
1555 The README file is now part of the data tarball as well as the code.
1556 It now states that files are public domain unless otherwise specified.
1557 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1558 Its details about the 1989 release moved to a place of honor near
1562 Release 2013f - 2013-09-24 23:37:36 -0700
1564 Changes affecting near-future time stamps
1566 Tocantins will very likely not observe DST starting this spring.
1567 (Thanks to Steffen Thorsen.)
1569 Jordan will likely stay at UT +03 indefinitely, and will not fall
1572 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1574 Changes affecting API
1576 The types of the global variables 'timezone' and 'altzone' (if present)
1577 have been changed back to 'long'. This is required for 'timezone'
1578 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1579 These variables were originally 'long' in the tz code, but were
1580 mistakenly changed to 'time_t' in 1987; nobody reported the
1581 incompatibility until now. The difference matters on x32, where
1582 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1584 Changes affecting the build procedure
1586 Avoid long strings in leapseconds.awk to work around a mawk bug.
1587 (Thanks to Cyril Baurand.)
1589 Changes affecting documentation and commentary
1591 New file 'NEWS' that contains release notes like this one.
1593 Paraguay's law does not specify DST transition time; 00:00 is customary.
1594 (Thanks to Waldemar Villamayor-Venialbo.)
1596 Minor capitalization fixes.
1598 Changes affecting version-control only
1600 The experimental GitHub repository now contains annotated and
1601 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1602 Releases are tagged starting with 2012e; earlier releases were
1603 done differently, and tags would either not have a simple name or
1604 not exactly match what was released.
1606 'make set-timestamps' is now simpler and a bit more portable.
1609 Release 2013e - 2013-09-19 23:50:04 -0700
1611 Changes affecting near-future time stamps
1613 This year Fiji will start DST on October 27, not October 20.
1614 (Thanks to David Wheeler for the heads-up.) For now, guess that
1615 Fiji will continue to spring forward the Sunday before the fourth
1618 Changes affecting current and future time zone abbreviations
1620 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1621 time zone abbreviations since 1932. (Thanks to George Ziegler,
1622 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1623 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1624 Asia/Makassar, and Asia/Pontianak.
1626 Use ART (UT -03, standard time), rather than WARST (also -03, but
1627 daylight saving time) for San Luis, Argentina since 2009.
1629 Changes affecting Godthåb time stamps after 2037 if version mismatch
1631 Allow POSIX-like TZ strings where the transition time's hour can
1632 range from -167 through 167, instead of the POSIX-required 0
1633 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1634 new Fiji rules. This is a more-compact way to represent
1635 far-future time stamps for America/Godthab, America/Santiago,
1636 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1637 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1638 this change. (Derived from a suggestion by Arthur David Olson.)
1640 Allow POSIX-like TZ strings where daylight saving time is in
1641 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1642 Argentina Summer Time all year. This supports a more-compact way
1643 to represent the 2013d data for America/Argentina/San_Luis.
1644 Because of the change for San Luis noted above this change does not
1645 affect the current data. (Thanks to Andrew Main (Zefram) for
1646 suggestions that improved this change.)
1648 Where these two TZ changes take effect, there is a minor extension
1649 to the tz file format in that it allows new values for the
1650 embedded TZ-format string, and the tz file format version number
1651 has therefore been increased from 2 to 3 as a precaution.
1652 Version-2-based client code should continue to work as before for
1653 all time stamps before 2038. Existing version-2-based client code
1654 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1655 files, and typically works in practice even for time stamps after
1656 2037; the only known exception is America/Godthab.
1658 Changes affecting time stamps before 1970
1660 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1661 some errors before 1947.
1663 Some zones have been turned into links, when they differ from existing
1664 zones only in older data entries that were likely invented or that
1665 differ only in LMT or transitions from LMT. These changes affect
1666 only time stamps before 1943. The affected zones are:
1667 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1668 America/Grenada, America/Guadeloupe, America/Marigot,
1669 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1670 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1671 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1672 confirming that the old Europe/Vaduz zone was wrong and the new
1673 link is better for WWII-era times.)
1675 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1676 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1679 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1680 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1683 Change the date of the circa-1850 Zurich transition from 1849-09-12
1684 to 1853-07-16, overriding Shanks with data from Messerli about
1685 postal and telegraph time in Switzerland.
1687 Changes affecting time zone abbreviations before 1970
1689 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1690 as Jakarta was called Batavia back then.
1692 Changes affecting API
1694 The 'zic' command now outputs a dummy transition when far-future
1695 data can't be summarized using a TZ string, and uses a 402-year
1696 window rather than a 400-year window. For the current data, this
1697 affects only the Asia/Tehran file. It does not affect any of the
1698 time stamps that this file represents, so zdump outputs the same
1699 information as before. (Thanks to Andrew Main (Zefram).)
1701 The 'date' command has a new '-r' option, which lets you specify
1702 the integer time to display, a la FreeBSD.
1704 The 'tzselect' command has two new options '-c' and '-n', which lets you
1705 select a zone based on latitude and longitude.
1707 The 'zic' command's '-v' option now warns about constructs that
1708 require the new version-3 binary file format. (Thanks to Arthur
1709 David Olson for the suggestion.)
1711 Support for floating-point time_t has been removed.
1712 It was always dicey, and POSIX no longer requires it.
1713 (Thanks to Eric Blake for suggesting to the POSIX committee to
1714 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1715 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1716 bugs and elucidating some of the corners of the old floating-point
1719 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1720 changed back to the old practice of using 'long' to represent UT
1721 offsets. This had been inadvertently and mistakenly changed to
1722 'int_fast32_t'. (Thanks to Christos Zoulas.)
1724 The code avoids undefined behavior on integer overflow in some
1725 more places, including gmtime, localtime, mktime and zdump.
1727 Changes affecting the zdump utility
1729 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1730 "UTC" does not make sense for time stamps that predate the introduction
1731 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1732 for clarifying UT vs UTC.)
1734 Data changes affecting behavior of tzselect and similar programs
1736 Country code BQ is now called the more-common name "Caribbean Netherlands"
1737 rather than the more-official "Bonaire, St Eustatius & Saba".
1739 Remove from zone.tab the names America/Montreal, America/Shiprock,
1740 and Antarctica/South_Pole, as they are equivalent to existing
1741 same-country-code zones for post-1970 time stamps. The data entries for
1742 these names are unchanged, so the names continue to work as before.
1744 Changes affecting code internals
1746 zic -c now runs way faster on 64-bit hosts when given large numbers.
1748 zic now uses vfprintf to avoid allocating and freeing some memory.
1750 tzselect now computes the list of continents from the data,
1751 rather than have it hard-coded.
1753 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1755 Changes affecting the build procedure
1757 The 'leapseconds' file is now generated automatically from a
1758 new file 'leap-seconds.list', which is a copy of
1759 <ftp://time.nist.gov/pub/leap-seconds.list>.
1760 A new source file 'leapseconds.awk' implements this.
1761 The goal is simplification of the future maintenance of 'leapseconds'.
1763 When building the 'posix' or 'right' subdirectories, if the
1764 subdirectory would be a copy of the default subdirectory, it is
1765 now made a symbolic link if that is supported. This saves about
1766 2 MB of file system space.
1768 The links America/Shiprock and Antarctica/South_Pole have been
1769 moved to the 'backward' file. This affects only nondefault builds
1770 that omit 'backward'.
1772 Changes affecting version-control only
1774 .gitignore now ignores 'date'.
1776 Changes affecting documentation and commentary
1778 Changes to the 'tzfile' man page
1780 It now mentions that the binary file format may be extended in
1781 future versions by appending data.
1783 It now refers to the 'zdump' and 'zic' man pages.
1785 Changes to the 'zic' man page
1787 It lists conditions that elicit a warning with '-v'.
1789 It says that the behavior is unspecified when duplicate names
1790 are given, or if the source of one link is the target of another.
1792 Its examples are updated to match the latest data.
1794 The definition of white space has been clarified slightly.
1795 (Thanks to Michael Deckers.)
1797 Changes to the 'Theory' file
1799 There is a new section about the accuracy of the tz database,
1800 describing the many ways that errors can creep in, and
1801 explaining why so many of the pre-1970 time stamps are wrong or
1802 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1803 Wollman for discussions that contributed to this).
1805 The 'Theory' file describes LMT better (this follows a
1806 suggestion by Guy Harris).
1808 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1810 It's mentioned that excluding 'backward' should not affect the
1811 other data, and it suggests at least one zone.tab name per
1812 inhabited country (thanks to Stephen Colebourne).
1814 Some longstanding restrictions on names are documented, e.g.,
1815 'America/New_York' precludes 'America/New_York/Bronx'.
1817 It gives more reasons for the 1970 cutoff.
1819 It now mentions which time_t variants are supported, such as
1820 signed integer time_t. (Thanks to Paul Goyette for reporting
1821 typos in an experimental version of this change.)
1823 (Thanks to Philip Newton for correcting typos in these changes.)
1825 Documentation and commentary is more careful to distinguish UT in
1826 general from UTC in particular. (Thanks to Steve Allen.)
1828 Add a better source for the Zurich 1894 transition.
1829 (Thanks to Pierre-Yves Berger.)
1831 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1834 Release 2013d - 2013-07-05 07:38:01 -0700
1836 Changes affecting future time stamps:
1838 Morocco's midsummer transitions this year are July 7 and August 10,
1839 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1841 Israel now falls back on the last Sunday of October.
1842 (Thanks to Ephraim Silverberg.)
1844 Changes affecting past time stamps:
1846 Specify Jerusalem's location more precisely; this changes the pre-1880
1849 Changing affecting metadata only:
1851 Fix typos in the entries for country codes BQ and SX.
1853 Changes affecting code:
1855 Rework the code to fix a bug with handling Australia/Macquarie on
1856 32-bit hosts (thanks to Arthur David Olson).
1858 Port to platforms like NetBSD, where time_t can be wider than long.
1860 Add support for testing time_t types other than the system's.
1861 Run 'make check_time_t_alternatives' to try this out.
1862 Currently, the tests fail for unsigned time_t;
1863 this should get fixed at some point.
1865 Changes affecting documentation and commentary:
1867 Deemphasize the significance of national borders.
1869 Update the zdump man page.
1871 Remove obsolete NOID comment (thanks to Denis Excoffier).
1873 Update several URLs and comments in the web pages.
1875 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1877 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1880 Release 2013c - 2013-04-19 16:17:40 -0700
1882 Changes affecting current and future time stamps:
1884 Palestine observed DST starting March 29, 2013. (Thanks to
1885 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1886 with the predicted rules being the last Thursday in March at 24:00
1887 to the first Friday on or after September 21 at 01:00.
1889 Assume that the recent change to Paraguay's DST rules is permanent,
1890 by moving the end of DST to the 4th Sunday in March every year.
1891 (Thanks to Carlos Raúl Perasso.)
1893 Changes affecting past time stamps:
1895 Fix some historical data for Palestine to agree with that of
1896 timeanddate.com, as follows:
1898 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1901 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1904 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1906 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1908 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1910 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1912 Fix times of habitation for Macquarie to agree with the Tasmania
1913 Parks & Wildlife Service history, which indicates that permanent
1914 habitation was 1899-1919 and 1948 on.
1916 Changing affecting metadata only:
1918 Macquarie Island is politically part of Australia, not Antarctica.
1919 (Thanks to Tobias Conradi.)
1921 Sort Macquarie more-consistently with other parts of Australia.
1922 (Thanks to Tim Parenti.)
1925 Release 2013b - 2013-03-10 22:33:40 -0700
1927 Changes affecting current and future time stamps:
1929 Haiti uses US daylight-saving rules this year, and presumably future years.
1930 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1932 Paraguay will end DST on March 24 this year.
1933 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1935 Morocco does not observe DST during Ramadan;
1936 try to predict Ramadan in Morocco as best we can.
1937 (Thanks to Erik Homoet for the heads-up.)
1939 Changes affecting commentary:
1941 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1942 Update URL for Solaris. Mention Internet RFC 6557.
1943 Update Internet RFCs 2445->5545, 2822->5322.
1944 Switch from FTP to HTTP for Internet RFCs.
1947 Release 2013a - 2013-02-27 09:20:35 -0800
1949 Change affecting binary data format:
1951 The zone offset at the end of version-2-format zone files is now
1952 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1954 Changes affecting current and future time stamps:
1956 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1957 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1958 (Thanks to Steffen Thorsen and Robert Elz.)
1960 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1961 (Thanks to Tobias Conradi and Arthur David Olson.)
1963 Many changes affect historical time stamps before 1940.
1964 These were deduced from: Milne J. Civil time. Geogr J. 1899
1965 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1967 Changes affecting the code:
1969 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1970 the data). (Thanks to Arthur David Olson.)
1972 Fix localtime bug when time_t is unsigned and data files were generated
1973 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1974 to Arthur David Olson for fixing.)
1976 Allow the email address for bug reports to be set by the packager.
1977 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1979 Update HTML checking to be compatible with Ubuntu 12.10.
1981 Check that files are a safe subset of ASCII. At some point we may
1982 relax this requirement to a safe subset of UTF-8. Without the
1983 check, some non-UTF-8 encodings were leaking into the distribution.
1987 Restore a comment about copyright notices that was inadvertently deleted.
1988 (Thanks to Arthur David Olson.)
1990 Improve the commentary about which districts observe what times
1991 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1993 Add web page links to tz.js.
1995 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1998 Release 2012j - 2012-11-12 18:34:49 -0800
2000 Libya moved to CET this weekend, but with DST planned next year.
2001 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2003 Signatures now have the extension .asc, not .sign, as that's more
2004 standard. (Thanks to Phil Pennock.)
2006 The output of 'zdump --version', and of 'zic --version', now
2007 uses a format that is more typical for --version.
2008 (Thanks to Joseph S. Myers.)
2010 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2011 now uses tz@iana.org rather than the old elsie address.
2013 zic -v now complains about abbreviations that are less than 3
2014 or more than 6 characters, as per Posix. Formerly, it checked
2015 for abbreviations that were more than 3.
2017 'make public' no longer puts its temporary directory under /tmp,
2018 and uses the just-built zic rather than the system zic.
2020 Various fixes to documentation and commentary.
2023 Release 2012i - 2012-11-03 12:57:09 -0700
2025 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2027 Linker flags can now be specified via LDFLAGS.
2028 AWK now defaults to 'awk', not 'nawk'.
2029 The shell in tzselect now defaults to /bin/bash, but this can
2030 be overridden by specifying KSHELL.
2031 The main web page now mentions the unofficial GitHub repository.
2032 (Thanks to Mike Frysinger.)
2034 Tarball signatures can now be built by running 'make signatures'.
2035 There are also new makefile rules 'tarballs', 'check_public', and
2036 separate makefile rules for each tarball and signature file.
2037 A few makefile rules are now more portable to strict POSIX.
2039 The main web page now lists the canonical IANA URL.
2042 Release 2012h - 2012-10-26 22:49:10 -0700
2044 Bahia no longer has DST. (Thanks to Kelley Cook.)
2046 Tocantins has DST. (Thanks to Rodrigo Severo.)
2048 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2050 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2054 More C modernization, except that at Arthur David Olson's suggestion
2055 the instances of 'register' were kept.
2058 Release 2012g - 2012-10-17 20:59:45 -0700
2060 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2062 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2066 To attack the version-number problem, this release ships the file
2067 'Makefile' (which contains the release number) in both the tzcode and
2068 the tzdata tarballs. The two Makefiles are identical, and should be
2069 identical in any matching pair of tarballs, so it shouldn't matter
2070 which order you extract the tarballs. Perhaps we can come up with a
2071 better version-number scheme at some point; this scheme does have the
2072 virtue of not adding more files.
2075 Release 2012f - 2012-09-12 23:17:03 -0700
2077 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2078 20 this year. (Thanks to Steffen Thorsen.)
2081 Release 2012e - 2012-08-02 20:44:55 -0700
2083 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2084 (Thanks to Steffen Thorsen.)
2086 * Use a single version number for both code and data.
2088 * .gitignore: New file.
2090 * Remove trailing white space.
2093 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2095 Changes for Morocco's time stamps, which take effect in a couple of
2096 hours, along with infrastructure changes to accommodate how the tz
2097 code and data are released on IANA.
2100 Release data2012c - 2012-03-27 12:17:25 -0400
2103 Summer time changes for Morocco (to start late April 2012)
2106 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2109 Haiti following US/Canada rules for 2012 (and we're assuming,
2110 for now anyway, for the future).
2113 Release 2012b - 2012-03-02 12:29:15 +0700
2115 There is just one change to tzcode2012b (compared with 2012a):
2116 the Makefile that was accidentally included with 2012a has been
2117 replaced with the version that should have been there, which is
2118 identical with the previous version (from tzcode2011i).
2120 There are just two changes in tzdata2012b compared with 2012a.
2122 Most significantly, summer time in Cuba has been delayed 3 weeks
2123 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2124 date, as listed in 2012a) is just a little over a week away, this
2127 Less importantly, an excess tab in one of the changes in zone.tab
2128 in 2012a has been removed.
2131 Release 2012a - 2012-03-01 18:28:10 +0700
2133 The changes in tzcode2012a (compared to the previous version, 2011i)
2134 are entirely to the README and tz-art.htm and tz-link.htm files, if
2135 none of those concern you, you can ignore the code update. The changes
2136 reflect the changed addresses for the mailing list and the code and
2137 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2138 has been added to tz-link.htm).
2140 In tzdata2012a (compared to the previous release, which was 2011n)
2141 the major changes are:
2142 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2143 Falkland Islands onto permanent summer time (we're assuming for the
2144 foreseeable future, though 2012 is all we're fairly certain of.)
2145 Armenia has abolished Summer Time.
2146 Tokelau jumped the International Date Line back last December
2147 (just the same as their near neighbour, Samoa).
2148 America/Creston is a new zone for a small area of British Columbia
2149 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2151 Other minor changes are:
2152 Corrections to 1918 Canadian summer time end dates.
2153 Updated URL for UK time zone history (in comments)
2154 A few typos in Le Corre's list of free French place names (comments)
2157 Release data2011n - 2011-10-30 14:57:54 +0700
2159 There are three changes of note - most urgently, Cuba (America/Havana)
2160 has extended summer time by two weeks, now to end on Nov 13, rather than
2161 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2162 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2163 all, and consequently that zone has been removed (again) and reinstated
2164 in the "backward" file as a link to Europe/Chisinau. And third, the
2165 end date for Fiji's summer time this summer was moved forward from the
2166 earlier planned Feb 26, to Jan 22.
2168 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2169 (and the incorrect syntax that was in the 2011m version of that file
2170 is so fixed - it would have been fixed in a different way had this
2171 change not happened - that's the "missing" sccs version id).
2174 Release data2011m - 2011-10-24 21:42:16 +0700
2176 In particular, the typos in comments in the data (2011-11-17 should have
2177 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2178 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2179 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2180 Tim Parenti, and also Denys Gavrysh)
2182 In addition, I added Europe/Tiraspol to zone.tab.
2184 This time, all the files have new version numbers... (including the files
2185 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2186 version numbers there...)
2189 Release data2011l - 2011-10-10 11:15:43 +0700
2191 There are just 2 changes that cause different generated tzdata files from
2192 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2193 is included, but commented out. Compared with the diff I sent out last week,
2194 this version also includes attributions for the sources for the changes
2195 (in much the same format as ado used, but the html tags have not been
2196 checked, verified, or used in any way at all, so if there are errors there,
2197 please let me know.)
2200 Release data2011k - 2011-09-20 17:54:03 -0400
2205 Release data2011j - 2011-09-12 09:22:49 -0400
2207 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2208 Tanzania); there are also two spelling corrections to comments in
2209 the australasia file (with thanks to Christos Zoulas).
2212 Release 2011i - 2011-08-29 05:56:32 -0400
2217 Release data2011h - 2011-06-15 18:41:48 -0400
2219 Russia and Curaçao changes
2222 Release 2011g - 2011-04-25 09:07:22 -0400
2224 update the rules for Egypt to reflect its abandonment of DST this year
2227 Release 2011f - 2011-04-06 17:14:53 -0400
2232 Release 2011e - 2011-03-31 16:04:38 -0400
2234 Morocco, Chile, and tz-link changes
2237 Release 2011d - 2011-03-14 09:18:01 -0400
2239 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
2242 Release 2011c - 2011-03-07 09:30:09 -0500
2244 These do affect current time stamps in Chile and Annette Island, Canada.
2247 Release 2011b - 2011-02-07 08:44:50 -0500
2252 Release 2011a - 2011-01-24 10:30:16 -0500
2257 Release data2010o - 2010-11-01 09:18:23 -0400
2259 change to the end of DST in Fiji in 2011
2262 Release 2010n - 2010-10-25 08:19:17 -0400
2267 Release 2010m - 2010-09-27 09:24:48 -0400
2269 Hong Kong, Vostok, and zic.c changes
2272 Release 2010l - 2010-08-16 06:57:25 -0400
2277 Release 2010k - 2010-07-26 10:42:27 -0400
2282 Release 2010j - 2010-05-10 09:07:48 -0400
2284 changes for Bahía de Banderas and for version naming
2287 Release data2010i - 2010-04-16 18:50:45 -0400
2289 the end of DST in Morocco on 2010-08-08
2292 Release data2010h - 2010-04-05 09:58:56 -0400
2297 Release data2010g - 2010-03-24 11:14:53 -0400
2302 Release 2010f - 2010-03-22 09:45:46 -0400
2307 Release data2010e - 2010-03-08 14:24:27 -0500
2309 corrects the Dhaka bug found by Danvin Ruangchan
2312 Release data2010d - 2010-03-06 07:26:01 -0500
2317 Release 2010c - 2010-03-01 09:20:58 -0500
2319 changes including KRE's suggestion for earlier initialization of
2320 "goahead" and "goback" structure elements
2323 Release code2010a - 2010-02-16 10:40:04 -0500
2328 Release data2010b - 2010-01-20 12:37:01 -0500
2333 Release data2010a - 2010-01-18 08:30:04 -0500
2338 Release data2009u - 2009-12-26 08:32:28 -0500
2340 changes to DST in Bangladesh
2343 Release 2009t - 2009-12-21 13:24:27 -0500
2348 Release data2009s - 2009-11-14 10:26:32 -0500
2350 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2353 Release 2009r - 2009-11-09 10:10:31 -0500
2355 "antarctica" and "tz-link.htm" changes
2358 Release 2009q - 2009-11-02 09:12:40 -0500
2360 with two corrections as reported by Eric Muller and Philip Newton
2363 Release data2009p - 2009-10-23 15:05:27 -0400
2365 Argentina (including San Luis) changes (with the correction from
2369 Release data2009o - 2009-10-14 16:49:38 -0400
2371 Samoa (commentary only), Pakistan, and Bangladesh changes
2374 Release data2009n - 2009-09-22 15:13:38 -0400
2376 added commentary for Argentina and a change to the end of DST in
2380 Release data2009m - 2009-09-03 10:23:43 -0400
2382 Samoa and Palestine changes
2385 Release data2009l - 2009-08-14 09:13:07 -0400
2387 Samoa (comments only) and Egypt
2390 Release 2009k - 2009-07-20 09:46:08 -0400
2395 Release data2009j - 2009-06-15 06:43:59 -0400
2397 Bangladesh change (with a short turnaround since the DST change is
2401 Release 2009i - 2009-06-08 09:21:22 -0400
2403 updating for DST in Bangladesh this year
2406 Release 2009h - 2009-05-26 09:19:14 -0400
2411 Release data2009g - 2009-04-20 16:34:07 -0400
2416 Release data2009f - 2009-04-10 11:00:52 -0400
2418 correct DST in Pakistan
2421 Release 2009e - 2009-04-06 09:08:11 -0400
2426 Release 2009d - 2009-03-23 09:38:12 -0400
2428 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2431 Release data2009c - 2009-03-16 09:47:51 -0400
2433 change to the start of Cuban DST
2436 Release 2009b - 2009-02-09 11:15:22 -0500
2441 Release 2009a - 2009-01-21 10:09:39 -0500
2446 Release data2008i - 2008-10-21 12:10:25 -0400
2448 southamerica and zone.tab files, with Argentina DST rule changes and
2449 United States zone reordering and recommenting
2452 Release 2008h - 2008-10-13 07:33:56 -0400
2457 Release 2008g - 2008-10-06 09:03:18 -0400
2459 Fix a broken HTML anchor and update Brazil's DST transitions;
2460 there's also a slight reordering of information in tz-art.htm.
2463 Release data2008f - 2008-09-09 22:33:26 -0400
2468 Release 2008e - 2008-07-28 14:11:17 -0400
2470 changes by Arthur David Olson and Jesper Nørgaard Welen
2473 Release data2008d - 2008-07-07 09:51:38 -0400
2475 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2478 Release data2008c - 2008-05-19 17:48:03 -0400
2480 Pakistan, Morocco, and Mongolia
2483 Release data2008b - 2008-03-24 08:30:59 -0400
2485 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2489 Release 2008a - 2008-03-08 05:42:16 -0500
2494 Release 2007k - 2007-12-31 10:25:22 -0500
2496 most importantly, changes to the "southamerica" file based on
2497 Argentina's readoption of daylight saving time
2500 Release 2007j - 2007-12-03 09:51:01 -0500
2502 1. eliminate the "P" (parameter) macro;
2504 2. the "noncontroversial" changes circulated on the time zone
2505 mailing list (less the changes to "logwtmp.c");
2507 3. eliminate "too many transition" errors when "min" is used in time
2510 4. changes by Paul Eggert (including updated information for Venezuela).
2513 Release data2007i - 2007-10-30 10:28:11 -0400
2515 changes for Cuba and Syria
2518 Release 2007h - 2007-10-01 10:05:51 -0400
2520 changes by Paul Eggert, as well as an updated link to the ICU
2521 project in tz-link.htm
2524 Release 2007g - 2007-08-20 10:47:59 -0400
2526 changes by Paul Eggert
2528 The "leapseconds" file has been updated to incorporate the most
2529 recent International Earth Rotation and Reference Systems Service
2532 There's an addition to tz-art.htm regarding the television show "Medium".
2535 Release 2007f - 2007-05-07 10:46:46 -0400
2537 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2540 changes to zic.c to allow hour values greater than 24 (along with
2541 Paul's improved time value overflow checking)
2544 Release 2007e - 2007-04-02 10:11:52 -0400
2546 Syria and Honduras changes by Paul Eggert
2548 zic.c variable renaming changes by Arthur David Olson
2551 Release 2007d - 2007-03-20 08:48:30 -0400
2553 changes by Paul Eggert
2555 the elimination of white space at the ends of lines
2558 Release 2007c - 2007-02-26 09:09:37 -0500
2560 changes by Paul Eggert
2563 Release 2007b - 2007-02-12 09:34:20 -0500
2565 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2567 changes to the commentary in "leapseconds" reflecting the IERS
2568 announcement that there is to be no positive leap second at the end
2572 Release 2007a - 2007-01-08 12:28:29 -0500
2574 changes by Paul Eggert
2576 Derick Rethan's Asmara change
2578 Oscar van Vlijmen's Easter Island local mean time change
2580 symbolic link changes
2583 Release 2006p - 2006-11-27 08:54:27 -0500
2585 changes by Paul Eggert
2588 Release 2006o - 2006-11-06 09:18:07 -0500
2590 changes by Paul Eggert
2593 Release 2006n - 2006-10-10 11:32:06 -0400
2595 changes by Paul Eggert
2598 Release 2006m - 2006-10-02 15:32:35 -0400
2600 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2602 (minimalist) changes to zic.8 to clarify "until" information
2605 Release data2006l - 2006-09-18 12:58:11 -0400
2607 Paul's best-effort work on this coming weekend's Egypt time change
2610 Release 2006k - 2006-08-28 12:19:09 -0400
2612 changes by Paul Eggert
2615 Release 2006j - 2006-08-21 09:56:32 -0400
2617 changes by Paul Eggert
2620 Release code2006i - 2006-08-07 12:30:55 -0400
2624 Ken Pizzini's conversion script
2627 Release code2006h - 2006-07-24 09:19:37 -0400
2629 adds public domain notices to four files
2631 includes a fix for transition times being off by a second
2633 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2636 Release 2006g - 2006-05-08 17:18:09 -0400
2638 northamerica changes by Paul Eggert
2641 Release 2006f - 2006-05-01 11:46:00 -0400
2643 a missing version number problem is fixed (with thanks to Bradley
2644 White for catching the problem)
2647 Release 2006d - 2006-04-17 14:33:43 -0400
2649 changes by Paul Eggert
2651 added new items to tz-arts.htm that were found by Paul
2654 Release 2006c - 2006-04-03 10:09:32 -0400
2656 two sets of data changes by Paul Eggert
2658 a fencepost error fix in zic.c
2660 changes to zic.c and the "europe" file to minimize differences
2661 between output produced by the old 32-bit zic and the new 64-bit
2665 Release 2006b - 2006-02-20 10:08:18 -0500
2666 [tz32code2006b + tz64code2006b + tzdata2006b]
2670 All SCCS IDs were bumped to "8.1" for this release.
2673 Release 2006a - 2006-01-30 08:59:31 -0500
2675 changes by Paul Eggert (in particular, Indiana time zone moves)
2677 an addition to the zic manual page to describe how special-case
2678 transitions are handled
2681 Release 2005r - 2005-12-27 09:27:13 -0500
2683 Canadian changes by Paul Eggert
2685 They also add "<pre>" directives to time zone data files and reflect
2686 changes to warning message logic in "zdump.c" (but with calls to
2687 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2690 Release 2005q - 2005-12-13 09:17:09 -0500
2692 Nothing earth-shaking here:
2693 1. Electronic mail addresses have been removed.
2694 2. Casts of the return value of exit have been removed.
2695 3. Casts of the argument of is.* macros have been added.
2696 4. Indentation in one section of zic.c has been fixed.
2697 5. References to dead URLs in the data files have been dealt with.
2700 Release 2005p - 2005-12-05 10:30:53 -0500
2702 "systemv", "tz-link.htm", and "zdump.c" changes
2703 (less the casts of arguments to the is* macros)
2706 Release 2005o - 2005-11-28 10:55:26 -0500
2708 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2710 zdump.c lint fixes by Arthur David Olson
2713 Release 2005n - 2005-10-03 09:44:09 -0400
2715 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2719 Release 2005m - 2005-08-29 12:15:40 -0400
2721 changes by Paul Eggert (with a small tweak to the tz-art change)
2723 a declaration of an unused variable has been removed from zdump.c
2726 Release 2005l - 2005-08-22 12:06:39 -0400
2728 changes by Paul Eggert
2730 overflow/underflow checks by Arthur David Olson, minus changes to
2731 the "Theory" file about the pending addition of 64-bit data (I grow
2732 less confident of the changes being accepted with each passing day,
2733 and the changes no longer increase the data files nine-fold--there's
2734 less than a doubling in size by my local Sun's reckoning)
2737 Release 2005k - 2005-07-14 14:14:24 -0400
2739 The "leapseconds" file has been edited to reflect the recently
2740 announced leap second at the end of 2005.
2742 I've also deleted electronic mail addresses from the files as an
2746 Release 2005j - 2005-06-13 14:34:13 -0400
2748 These reflect changes to limit the length of time zone abbreviations
2749 and the characters used in those abbreviations.
2751 There are also changes to handle POSIX-style "quoted" time zone
2752 environment variables.
2754 The changes were circulated on the time zone mailing list; the only
2755 change since then was the removal of a couple of minimum-length of
2756 abbreviation checks.
2759 Release data2005i - 2005-04-21 15:04:16 -0400
2761 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2764 Release 2005h - 2005-04-04 11:24:47 -0400
2766 changes by Paul Eggert
2768 minor changes to Makefile and zdump.c to produce more useful output
2769 when doing a "make typecheck"
2772 Release 2005g - 2005-03-14 10:11:21 -0500
2774 changes by Paul Eggert (a change to current DST rules in Uruguay and
2775 an update to a link to time zone software)
2778 Release 2005f - 2005-03-01 08:45:32 -0500
2780 data and documentation changes by Paul Eggert
2783 Release 2005e - 2005-02-10 15:59:44 -0500
2788 Release code2005d - 2005-01-31 09:21:47 -0500
2790 make zic complain about links to links if the -v flag is used
2792 have "make public" do more code checking
2794 add an include to "localtime.c" for the benefit of gcc systems
2797 Release 2005c - 2005-01-17 18:36:29 -0500
2799 get better results when mktime runs on a system where time_t is double
2801 changes to the data files (most importantly to Paraguay)
2804 Release 2005b - 2005-01-10 09:19:54 -0500
2806 Get localtime and gmtime working on systems with exotic time_t types.
2808 Update the leap second commentary in the "leapseconds" file.
2811 Release 2005a - 2005-01-01 13:13:44 -0500
2816 Release code2004i - 2004-12-14 13:42:58 -0500
2818 Deal with systems where time_t is unsigned.
2821 Release code2004h - 2004-12-07 11:40:18 -0500
2823 64-bit-time_t changes
2826 Release 2004g - 2004-11-02 09:06:01 -0500
2828 update to Cuba (taking effect this weekend)
2830 other changes by Paul Eggert
2832 correction of the spelling of Oslo
2834 changed versions of difftime.c and private.h
2837 Release code2004f - 2004-10-21 10:25:22 -0400
2839 Cope with wide-ranging tm_year values.
2842 Release 2004e - 2004-10-11 14:47:21 -0400
2844 Brazil/Argentina/Israel changes by Paul Eggert
2846 changes to tz-link.htm by Paul
2848 one small fix to Makefile
2851 Release 2004d - 2004-09-22 08:27:29 -0400
2853 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2856 Release 2004c - 2004-08-11 12:06:26 -0400
2858 asctime-related changes
2860 (variants of) some of the documentation changes suggested by Paul Eggert
2863 Release 2004b - 2004-07-19 14:33:35 -0400
2865 data changes by Paul Eggert - most importantly, updates for Argentina
2868 Release 2004a - 2004-05-27 12:00:47 -0400
2870 changes by Paul Eggert
2872 Handle DST transitions that occur at the end of a month in some
2873 years but at the start of the following month in other years.
2875 Add a copy of the correspondence that's the basis for claims about
2876 DST in the Navajo Nation.
2879 Release 2003e - 2003-12-15 09:36:47 -0500
2881 changes by Arthur David Olson (primarily code changes)
2883 changes by Paul Eggert (primarily data changes)
2885 minor changes to "Makefile" and "northamerica" (in the latter case,
2886 optimization of the "Toronto" rules)
2889 Release 2003d - 2003-10-06 09:34:44 -0400
2891 changes by Paul Eggert
2894 Release 2003c - 2003-09-16 10:47:05 -0400
2896 Fix bad returns in zic.c's inleap function.
2897 Thanks to Bradley White for catching the problem!
2900 Release 2003b - 2003-09-16 07:13:44 -0400
2902 Add a "--version" option (and documentation) to the zic and zdump commands.
2904 changes to overflow/underflow checking in zic
2906 a localtime typo fix.
2908 Update the leapseconds and tz-art.htm files.
2911 Release 2003a - 2003-03-24 09:30:54 -0500
2913 changes by Paul Eggert
2915 a few additions and modifications to the tz-art.htm file
2918 Release 2002d - 2002-10-15 13:12:42 -0400
2920 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2922 There's also a new time zone quote in "tz-art.htm".
2925 Release 2002c - 2002-04-04 11:55:20 -0500
2927 changes by Paul Eggert
2929 Change zic.c to avoid creating symlinks to files that don't exist.
2932 Release 2002b - 2002-01-28 12:56:03 -0500
2934 [These change notes are for Release 2002a, which was corrupted.
2935 2002b was a corrected version of 2002a.]
2937 changes by Paul Eggert
2939 Update the "leapseconds" file to note that there'll be no leap
2940 second at the end of June, 2002.
2942 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2944 Change to "difftime.c" to avoid sizeof problems.
2947 Release 2001d - 2001-10-09 13:31:32 -0400
2949 changes by Paul Eggert
2952 Release 2001c - 2001-06-05 13:59:55 -0400
2954 changes by Paul Eggert and Andrew Brown
2957 Release 2001b - 2001-04-05 16:44:38 -0400
2959 changes by Paul Eggert (modulo jnorgard's typo fix)
2961 tz-art.htm has been HTMLified.
2964 Release 2001a - 2001-03-13 12:57:44 -0500
2966 changes by Paul Eggert
2968 An addition to the "leapseconds" file: comments with the text of the
2969 latest IERS leap second notice.
2971 Trailing white space has been removed from data file lines, and
2972 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2976 Release 2000h - 2000-12-14 15:33:38 -0500
2978 changes by Paul Eggert
2980 one typo fix in the "art" file
2982 With providence, this is the last update of the millennium.
2985 Release 2000g - 2000-10-10 11:35:22 -0400
2987 changes by Paul Eggert
2989 correction of John Mackin's name submitted by Robert Elz
2991 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2992 Emmy Awards broadcast.
2995 Release 2000f - 2000-08-10 09:31:58 -0400
2997 changes by Paul Eggert
2999 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3001 Error checking and messages in the "yearistype" script have been
3005 Release 2000e - 2000-07-31 09:27:54 -0400
3007 data changes by Paul Eggert
3009 a change to the default value of the defined constant HAVE_STRERROR
3011 the addition of a Dave Barry quote on DST to the tz-arts file
3014 Release 2000d - 2000-04-20 15:43:04 -0400
3016 changes to the documentation and code of strftime for C99 conformance
3018 a bug fix for date.c
3020 These are based on (though modified from) changes by Paul Eggert.
3023 Release 2000c - 2000-03-04 10:31:43 -0500
3025 changes by Paul Eggert
3028 Release 2000b - 2000-02-21 12:16:29 -0500
3030 changes by Paul Eggert and Joseph Myers
3032 modest tweaks to the tz-art.htm and tz-link.htm files
3035 Release 2000a - 2000-01-18 09:21:26 -0500
3037 changes by Paul Eggert
3039 The two hypertext documents have also been renamed.
3042 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3044 Paul Eggert's changes
3046 additions to the "zic" manual page and the "Arts.htm" file
3049 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3054 Release data1999h - 1999-10-07 03:50:29 -0400
3056 changes by Paul Eggert to "europe" (most importantly, fixing
3057 Lithuania and Estonia)
3060 Release 1999g - 1999-09-28 11:06:18 -0400
3062 data changes by Paul Eggert (most importantly, the change for
3063 Lebanon that buys correctness for this coming Sunday)
3065 The "code" file contains changes to "Makefile" and "checktab.awk" to
3066 allow better checking of time zone files before they are published.
3069 Release 1999f - 1999-09-23 09:48:14 -0400
3071 changes by Arthur David Olson and Paul Eggert
3074 Release 1999e - 1999-08-17 15:20:54 -0400
3076 changes circulated by Paul Eggert, although the change to handling
3077 of DST-specifying time zone names has been commented out for now
3078 (search for "XXX" in "localtime.c" for details). These files also
3079 do not make any changes to the start of DST in Brazil.
3081 In addition to Paul's changes, there are updates to "Arts.htm" and
3085 Release 1999d - 1999-03-30 11:31:07 -0500
3087 changes by Paul Eggert
3089 The Makefile's "make public" rule has also been changed to do a test
3090 compile of each individual time zone data file (which should help
3091 avoid problems such as the one we had with Nicosia).
3094 Release 1999c - 1999-03-25 09:47:47 -0500
3096 changes by Paul Eggert, most importantly the change for Chile.
3099 Release 1999b - 1999-02-01 17:51:44 -0500
3101 changes by Paul Eggert
3103 code changes (suggested by Mani Varadarajan, mani at be.com) for
3104 correct handling of symbolic links when building using a relative directory
3106 code changes to generate correct messages for failed links
3108 updates to the URLs in Arts.htm
3111 Release 1999a - 1999-01-19 16:20:29 -0500
3113 error message internationalizations and corrections in zic.c and
3114 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3118 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3120 changes for Brazil, Chile, and Germany
3122 support for use of "24:00" in the input files for the time zone compiler
3125 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3127 changes by Paul Eggert
3129 correction to a define in the "private.h" file
3132 Release data1998g - 1998-08-11 03:28:35 -0000
3133 [tzdata1998g.tar.gz is missing!]
3135 Lithuanian change provided by mgedmin at pub.osf.it
3137 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3138 "backward") to ensure that the GMT file is created even where folks
3139 don't want the "backward" links (as suggested by Paul Eggert).
3142 Release data1998f - 1998-07-20 13:50:00 -0000
3143 [tzdata1998f.tar.gz is missing!]
3145 Update the "leapseconds" file to include the newly-announced
3146 insertion at the end of 1998.
3149 Release code1998f - 1998-06-01 10:18:31 -0400
3151 addition to localtime.c by Guy Harris
3154 Release 1998e - 1998-05-28 09:56:26 -0400
3156 The Makefile is changed to produce zoneinfo-posix rather than
3157 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3160 data changes by Paul Eggert
3162 changes from Guy Harris to provide asctime_r and ctime_r
3164 A usno1998 file (substantially identical to usno1997) has been added.
3167 Release 1998d - 1998-05-14 11:58:34 -0400
3169 changes to comments (in particular, elimination of references to CIA maps).
3170 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3171 where changes occur.
3174 Release 1998c - 1998-02-28 12:32:26 -0500
3176 changes by Paul Eggert (save the "French correction," on which I'll
3177 wait for the dust to settle)
3181 changes and additions to Arts.htm
3184 Release 1998b - 1998-01-17 14:31:51 -0500
3186 URL cleanups and additions
3189 Release 1998a - 1998-01-13 12:37:35 -0500
3191 changes by Paul Eggert
3194 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3196 changes by Paul Eggert, with minor modifications from Arthur David
3197 Olson to make the files more browser friendly
3200 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3202 minor changes to put "TZif" at the start of each time zone information file
3204 a rule has also been added to the Makefile so you can
3206 to just recompile the zone information files (rather than doing a
3207 full "make install" with its other effects).
3210 Release data1997i - 1997-10-07 08:45:38 -0400
3212 changes to Africa by Paul Eggert
3215 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3217 corrections for Uruguay (and other locations)
3219 Arthur David Olson's simple-minded fix allowing mktime to both
3220 correctly handle leap seconds and correctly handle tm_sec values
3221 upon which arithmetic has been performed.
3224 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3226 Paul Eggert's updates
3228 a small change to a function prototype;
3230 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3231 include information on Around the World in Eighty Days.
3234 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3236 fixes to zic's error handling
3238 changes inspired by the item circulated on Slovenia
3240 The description of Web resources has been HTMLified for browsing
3243 A new piece of tz-related music has been added to the "Music" file.
3246 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3248 Paul Eggert's latest suggestions
3251 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3253 changes to "zic.c" to correct performance of the "-s" option
3255 a new file "usno1997"
3258 Release data1997c - 1997-03-04 09:58:18 -0500
3263 Release 1997b - 1997-02-27 18:34:19 -0500
3265 The data file incorporates the 1997 leap second.
3267 The code file incorporates Arthur David Olson's take on the
3268 zic/multiprocessor/directory-creation situation.
3271 Release 1997a - 1997-01-21 09:11:10 -0500
3273 Paul Eggert's Antarctica (and other changes)
3275 Arthur David Olson finessed the "getopt" issue by checking against
3276 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3277 is returned while SunOS 5.5's manual says EOF is returned).
3280 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3282 Paul Eggert's latest changes
3285 Release code1996n - 1996-12-16 09:42:02 -0500
3287 link snapping fix from Bruce Evans (via Garrett Wollman)
3290 Release data1996m - 1996-11-24 02:37:34 -0000
3291 [tzdata1996m.tar.gz is missing!]
3293 Paul Eggert's batch of changes
3296 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3298 No functional changes here; the files have simply been changed to
3299 make more use of ISO style dates in comments. The names of the above
3300 files now include the year in full.
3303 Release code96l - 1996-09-08 17:12:20 -0400
3305 tzcode96k was missing a couple of pieces.
3308 Release 96k - 1996-09-08 16:06:22 -0400
3310 the latest round of changes from Paul Eggert
3312 the recent Year 2000 material
3315 Release code96j - 1996-07-30 13:18:53 -0400
3317 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3320 Release code96i - 1996-07-27 20:11:35 -0400
3322 Paul's suggested patch for strftime %V week numbers
3325 Release data96i - 1996-07-01 18:13:04 -0400
3327 "northamerica" and "europe" changes by Paul Eggert
3330 Release code96h - 1996-06-05 08:02:21 -0400
3332 fix for handling transitions specified in Universal Time
3334 Some "public domain" notices have also been added.
3337 Release code96g - 1996-05-16 14:00:26 -0400
3339 fix for the simultaneous-DST-and-zone-change challenge
3342 Release data96h - 1996-05-09 17:40:51 -0400
3344 changes by Paul Eggert
3347 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3348 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3350 The changes get us some of the way to fixing the problems noted in Paul
3351 Eggert's letter yesterday (in addition to a few others). The approach
3352 has been to make zic a bit smarter about figuring out what time zone
3353 abbreviations apply just after the time specified in the "UNTIL" part
3354 of a zone line. Putting the smarts in zic means avoiding having
3355 transition times show up in both "Zone" lines and "Rule" lines, which
3356 in turn avoids multiple transition time entries in time zone files.
3357 (This also makes the zic input files such as "europe" a bit shorter and
3358 should ease maintenance.)
3361 Release data96f - 1996-04-19 19:20:03 -0000
3362 [tzdata96f.tar.gz is missing!]
3364 The only changes are to the "northamerica" file; the time zone
3365 abbreviation for Denver is corrected to MST (and MDT), and the
3366 comments for Mexico have been updated.
3369 Release data96e - 1996-03-19 17:37:26 -0500
3371 Proposals by Paul Eggert, in particular the Portugal change that
3372 comes into play at the end of this month.
3375 Release data96d - 1996-03-18 20:49:39 -0500
3380 Release code96e - 1996-02-29 15:43:27 -0000
3381 [tzcode96e.tar.gz is missing!]
3383 internationalization changes and the fix to the documentation for strftime
3386 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3388 The "code" file simply updates Bob Kridle's electronic address.
3390 The "data" file updates rules for Mexico.
3393 Release data96b - 1996-01-27 15:44:42 -0500
3398 Release code96c - 1996-01-16 16:58:15 -0500
3400 leap-year streamlining and binary-search changes
3405 Release code96b - 1996-01-10 20:42:39 -0500
3407 fixes and enhancements from Paul Eggert, including code that
3408 emulates the behavior of recent versions of the SunOS "date"
3412 Release 96a - 1996-01-06 09:08:24 -0500
3416 fixes to strftime.c for correct ISO 8601 week number generation,
3417 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3418 numbers (which are not necessarily the same as calendar year numbers)
3421 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3423 The latest revisions from Paul Eggert are included, the usno1995
3424 file has been updated, and a new file ("WWW") covering useful URLs
3428 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3430 A simplification of a macro definition, a change to data for Sudan,
3431 and (for last minute shoppers) notes in the "Music" file on the CD
3435 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3437 (slightly reformatted) 8-bit-clean proposed patch
3439 minor patch: US/Eastern -> America/New_York
3441 snapshot of the USNO's latest data ("usno1995")
3443 some other minor cleanups
3446 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3447 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3451 support for 64-bit time_t's
3453 optimization in localtime.c
3456 Release code95e - 1995-10-13 13:23:57 -0400
3458 the mktime change to scan from future to past when trying to find time zone
3462 Release data95i - 1995-09-26 10:43:26 -0400
3464 For Canada/Central, guess that the Sun customer's "one week too
3465 early" was just a approximation, and the true error is one month
3466 too early. This is consistent with the rest of Canada.
3469 Release data95h - 1995-09-21 11:26:48 -0400
3471 latest changes from Paul Eggert
3474 Release code95d - 1995-09-14 11:14:45 -0400
3476 the addition of a "Music" file, which documents four recorded
3477 versions of the tune "Save That Time".
3480 Release data95g - 1995-09-01 17:21:36 -0400
3482 "yearistype" correction
3485 Release data95f - 1995-08-28 20:46:56 -0400
3487 Paul Eggert's change to the australasia file
3490 Release data95e - 1995-07-08 18:02:34 -0400
3492 The only change is a leap second at the end of this year.
3493 Thanks to Bradley White for forwarding news on the leap second.
3496 Release data95d - 1995-07-03 13:26:22 -0400
3498 Paul Eggert's changes
3501 Release data95c - 1995-07-02 19:19:28 -0400
3503 changes to "asia", "backward", "europe", and "southamerica"
3504 (read: northamericacentrics need not apply)
3507 Release code95c - 1995-03-13 14:00:46 -0500
3509 one-line fix for sign extension problems in detzcode
3512 Release 95b - 1995-03-04 11:22:38 -0500
3514 Minor changes in both:
3516 The "code" file contains a workaround for the lack of "unistd.h" in
3517 Microsoft C++ version 7.
3519 The "data" file contains a fixed "Link" for America/Shiprock.
3522 Release 94h - 1994-12-10 12:51:14 -0500
3526 * incorporate the changes to "zdump" and "date" to make changes to
3527 the "TZ" environment variable permanent;
3529 * incorporate the table changes by Paul Eggert;
3531 * include (and document) support for universal time specifications in
3532 data files - but do not (yet) include use of this feature in the
3535 Think of this as "TZ Classic" - the software has been set up not to break if
3536 universal time shows up in its input, and data entries have been
3537 left as is so as not to break existing implementations.
3540 Release data94f - 1994-08-20 12:56:09 -0400
3542 (with thanks!) the latest data updates from Paul Eggert
3545 Release data94e - 1994-06-04 13:13:53 -0400
3550 Release code94g - 1994-05-05 12:14:07 -0400
3552 fix missing "optind.c" and a reference to it in the Makefile
3555 Release code94f - 1994-05-05 13:00:33 -0000
3556 [tzcode94f.tar.gz is missing!]
3558 changes to avoid overflow in difftime, as well as changes to cope
3559 with the 52/53 challenge in strftime
3562 Release code94e - 1994-03-30 23:32:59 -0500
3564 change for the benefit of PCTS
3567 Release 94d - 1994-02-24 15:42:25 -0500
3569 Avoid clashes with POSIX semantics for zones such as GMT+4.
3571 Some other very minor housekeeping is also present.
3574 Release code94c - 1994-02-10 08:52:40 -0500
3576 Fix bug where mkdirs was broken unless you compile with
3577 -fwritable-strings (which is generally losing to do).
3580 Release 94b - 1994-02-07 10:04:33 -0500
3582 work by Paul Eggert who notes:
3584 I found another book of time zone histories by E W Whitman; it's not
3585 as extensive as Shanks but has a few goodies of its own. I used it
3586 to update the tables. I also fixed some more as a result of
3587 correspondence with Adam David and Peter Ilieve, and move some stray
3588 links from 'europe' to 'backward'. I corrected some scanning errors
3591 As far as the code goes, I fixed zic to allow years in the range
3592 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3593 And I cleaned up the zic documentation a little bit.
3596 Release data94a - 1994-02-03 08:58:54 -0500
3598 It simply incorporates the recently announced leap second into the
3602 Release 93g - 1993-11-22 17:28:27 -0500
3604 Paul Eggert has provided a good deal of historic information (based
3605 on Shanks), and there are some code changes to deal with the buglets
3606 that crawled out in dealing with the new information.
3609 Release 93f - 1993-10-15 12:27:46 -0400
3611 Paul Eggert's changes
3614 Release 93e - 1993-09-05 21:21:44 -0400
3616 This has updated data for Israel, England, and Kwajalein. There's
3617 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3618 Thanks to Paul Eggert and Peter Ilieve for the changes.
3621 Release 93d - 1993-06-17 23:34:17 -0400
3623 new fix and new data on Israel
3626 Release 93c - 1993-06-06 19:31:55 -0400
3631 Release 93b - 1993-02-02 14:53:58 -0500
3633 updated "leapseconds" file
3636 Release 93 - 1993-01-08 07:01:06 -0500
3638 At kre's suggestion, the package has been split in two - a code piece
3639 (which also includes documentation) that's only of use to folks who
3640 want to recompile things and a data piece useful to anyone who can
3643 The new version has a few changes to the data files, a few
3644 portability changes, and an off-by-one fix (with thanks to
3645 Tom Karzes at deshaw.com for providing a description and a
3649 Release 92c - 1992-11-21 17:35:36 -0000
3650 [tz92c.tar.Z is missing!]
3652 The fallout from the latest round of DST transitions.
3654 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3655 there's also a change to "zic.c" that makes it portable to more systems.
3658 Release 92 - 1992-04-25 18:17:03 -0000
3659 [tz92.tar.Z is missing!]
3661 By popular demand (well, at any rate, following a request by kre at munnari)
3664 The 1989 update of the time zone package featured:
3666 * POSIXization (including interpretation of POSIX-style TZ environment
3667 variables, provided by Guy Harris),
3668 * ANSIfication (including versions of "mktime" and "difftime"),
3669 * SVIDulation (an "altzone" variable)
3670 * MACHination (the "gtime" function)
3671 * corrections to some time zone data (including corrections to the rules
3672 for Great Britain and New Zealand)
3673 * reference data from the United States Naval Observatory for folks who
3674 want to do additional time zones
3675 * and the 1989 data for Saudi Arabia.
3677 (Since this code will be treated as "part of the implementation" in some
3678 places and as "part of the application" in others, there's no good way to
3679 name functions, such as timegm, that are not part of the proposed ANSI C
3680 standard; such functions have kept their old, underscore-free names in this
3683 And the "dysize" function has disappeared; it was present to allow
3684 compilation of the "date" command on old BSD systems, and a version of "date"
3685 is now provided in the package. The "date" command is not created when you
3686 "make all" since it may lack options provided by the version distributed with
3687 your operating system, or may not interact with the system in the same way
3688 the native version does.
3690 Since POSIX frowns on correct leap second handling, the default behavior of
3691 the "zic" command (in the absence of a "-L" option) has been changed to omit
3692 leap second information from its output files.
3698 This file contains copies of the part of each release announcement
3699 that talks about the changes in that release. The text has been
3700 adapted and reformatted for the purposes of this file.
3702 Traditionally a release R consists of a pair of tarball files,
3703 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3704 code2010a, data2012c) consist of just one or the other tarball, and a
3705 few (e.g., code2012c-data2012d) have tarballs with mixed version
3706 numbers. Recent releases also come in an experimental format
3707 consisting of a single tarball tzdb-R.tar.lz with extra data.
3709 Release time stamps are taken from the release's commit (for newer,
3710 Git-based releases), from the newest file in the tarball (for older
3711 releases, where this info is available) or from the email announcing
3712 the release (if all else fails; these are marked with a time zone of
3713 -0000 and an "is missing!" comment).
3715 Earlier versions of the code and data were not announced on the tz
3716 list and are not summarized here.
3718 This file is in the public domain.