1 News for the tz database
3 Release 2018c - 2018-01-22 23:00:44 -0800
6 Revert Irish changes that relied on negative DST offsets.
10 Revert the 2018a change to Europe/Dublin. As before, this change
11 does not affect UT offsets or abbreviations; it affects only
12 whether timestamps are considered to be standard time or
13 daylight-saving time, as expressed in the tm_isdst flag of C's
14 struct tm type. This reversion is intended to be a temporary
15 workaround for problems discovered with downstream uses of
16 releases 2018a and 2018b, which implemented Irish time by using
17 negative DST offsets in the Eire rules of the 'europe' file.
18 Although negative DST offsets have been part of tzcode for many
19 years and are supported by many platforms, they were not
20 documented before 2018a and ICU and OpenJDK do not currently
21 support them. A mechanism to export data to platforms lacking
22 support for negative DST is planned to be developed before the
23 change is reapplied. (Problems reported by Deborah Goldsmith and
26 Changes to past time stamps
28 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
29 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
31 Changes to build procedure
33 The build procedure now works around mawk 1.3.3's lack of support
34 for character class expressions. (Problem reported by Ohyama.)
37 Release 2018b - 2018-01-17 23:24:48 -0800
40 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
42 Changes to build procedure
44 The distribution now contains the file 'pacificnew' again.
45 This file was inadvertantly omitted in the 2018a distribution.
46 (Problem reported by Matias Fonzo.)
49 Release 2018a - 2018-01-12 22:29:21 -0800
52 São Tomé and Príncipe switched from +00 to +01.
53 Brazil's DST will now start on November's first Sunday.
54 Ireland's standard time is now in the summer, not the winter.
55 Use Debian-style installation locations, instead of 4.3BSD-style.
58 Changes to past and future time stamps
60 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
61 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
63 Changes to future time stamps
65 Starting in 2018 southern Brazil will begin DST on November's
66 first Sunday instead of October's third Sunday. (Thanks to
69 Changes to past time stamps
71 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
72 been corrected. The 'backzone' and 'zone.tab' files did not agree
73 with the 'africa' and 'zone1970.tab' files. (Problem reported by
76 The abbreviation invented for Bolivia Summer Time (1931-2) is now
77 BST instead of BOST, to be more consistent with the convention
78 used for Latvian Summer Time (1918-9) and for British Summer Time.
82 Change Europe/Dublin so that it observes Irish Standard Time (UT
83 +01) in summer and GMT (as negative daylight-saving) in winter,
84 instead of observing standard time (GMT) in winter and Irish
85 Summer Time (UT +01) in summer. This change does not affect UT
86 offsets or abbreviations; it affects only whether timestamps are
87 considered to be standard time or daylight-saving time, as
88 expressed in the tm_isdst flag of C's struct tm type.
89 (Discrepancy noted by Derick Rethans.)
91 Changes to build procedure
93 The default installation locations have been changed to mostly
94 match Debian circa 2017, instead of being designed as an add-on to
95 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
96 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
97 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
98 locations more precisely. (This responds to suggestions from
99 Brian Inglis and from Steve Summit.)
101 The default installation procedure no longer creates the
102 backward-compatibility link US/Pacific-New, which causes
103 confusion during user setup (e.g., see Debian bug 815200).
104 Use 'make BACKWARD="backward pacificnew"' to create the link
105 anyway, for now. Eventually we plan to remove the link entirely.
107 tzdata.zi now contains a version-number comment.
108 (Suggested by Tom Lane.)
110 The Makefile now quotes values like BACKWARD more carefully when
111 passing them to the shell. (Problem reported by Zefram.)
113 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
114 that have snprintf and use pre-C99 compilers. (Problem reported
119 zic has a new option -t FILE that specifies the location of the
120 file that determines local time when TZ is unset. The default for
121 this location can be configured via the new TZDEFAULT makefile
122 macro, which defaults to /etc/localtime.
124 Diagnostics and commentary now distinguish UT from UTC more
125 carefully; see theory.html for more information about UT vs UTC.
127 zic has been ported to GCC 8's -Wstringop-truncation option.
128 (Problem reported by Martin Sebor.)
130 Changes to documentation and commentary
132 The zic man page now documents the longstanding behavior that
133 times and years can be out of the usual range, with negative times
134 counting backwards from midnight and with year 0 preceding year 1.
135 (Problem reported by Michael Deckers.)
137 The theory.html file now mentions the POSIX limit of six chars
138 per abbreviation, and lists alphabetic abbreviations used.
140 The files tz-art.htm and tz-link.htm have been renamed to
141 tz-art.html and tz-link.html, respectively, for consistency with
142 other file names and to simplify web server configuration.
145 Release 2017c - 2017-10-20 14:49:34 -0700
148 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
149 Fiji ends DST 2018-01-14, not 2018-01-21.
150 Namibia switches from +01/+02 to +02 on 2018-04-01.
151 Sudan switches from +03 to +02 on 2017-11-01.
152 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
153 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
154 A new file tzdata.zi now holds a small text copy of all data.
155 The zic input format has been regularized slightly.
157 Changes to future time stamps
159 Northern Cyprus has decided to resume EU rules starting
160 2017-10-29, thus reinstituting winter time.
162 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
163 predicted. (Thanks to Dominic Fok.) Adjust future predictions
166 Namibia will switch from +01 with DST to +02 all year on
167 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
168 at 02:00. (Thanks to Steffen Thorsen.)
170 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
171 Atyya and Yahia Abdalla.) South Sudan is not switching, so
172 Africa/Juba is no longer a link to Africa/Khartoum.
174 Tonga has likely ended its experiment with DST, and will not
175 adjust its clocks on 2017-11-05. Although Tonga has not announced
176 whether it will continue to observe DST, the IATA is assuming that
177 it will not. (Thanks to David Wade.)
179 Turks & Caicos will switch from -04 all year to -05 with US DST on
180 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
181 at 02:00. (Thanks to Steffen Thorsen.)
183 Changes to past time stamps
185 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
186 (Thanks to Arthur David Olson.)
188 Detroit did not observe DST in 1967.
190 Use railway time for Asia/Kolkata before 1941, by switching to
191 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
192 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
194 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
195 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
197 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
198 American time in 1892, not 1879. (Thanks to Michael Deckers.)
200 Adjust the 1867 transition in Alaska to better reflect the
201 historical record, by changing it to occur on 1867-10-18 at 15:30
202 Sitka time rather than at the start of 1867-10-17 local time.
203 Although strictly speaking this is accurate only for Sitka,
204 the rest of Alaska's blanks need to be filled in somehow.
206 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
207 (Thanks to Michael Deckers.)
209 Add 7 s to the UT offset in Asia/Yangon before 1920.
211 Changes to zone names
213 Remove Canada/East-Saskatchewan from the 'backward' file, as it
214 exceeded the 14-character limit and was an unused misnomer anyway.
216 Changes to build procedure
218 To support applications that prefer to read time zone data in text
219 form, two zic input files tzdata.zi and leapseconds are now
220 installed by default. The commands 'zic tzdata.zi' and 'zic -L
221 leapseconds tzdata.zi' can reproduce the tzdata binary files
222 without and with leap seconds, respectively. To prevent these two
223 new files from being installed, use 'make TZDATA_TEXT=', and to
224 suppress leap seconds from the tzdata text installation, use 'make
225 TZDATA_TEXT=tzdata.zi'.
227 'make BACKWARD=' now suppresses backward-compatibility names
228 like 'US/Pacific' that are defined in the 'backward' and
231 'make check' now works on systems that lack a UTF-8 locale,
232 or that lack the nsgmls program. Set UTF8_LOCALE to configure
233 the name of a UTF-8 locale, if you have one.
235 Y2K runtime checks are no longer enabled by default. Add
236 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
237 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
238 to disable them. (New name suggested by Brian Inglis.)
240 The build procedure for zdump now works on AIX 7.1.
241 (Problem reported by Kees Dekker.)
245 zic and the reference runtime now reject multiple leap seconds
246 within 28 days of each other, or leap seconds before the Epoch.
247 As a result, support for double leap seconds, which was
248 obsolescent and undocumented, has been removed. Double leap
249 seconds were an error in the C89 standard; they have never existed
250 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
251 noticing glitches in the code that uncovered this problem.)
253 zic now warns about use of the obsolescent and undocumented -y
254 option, and about use of the obsolescent TYPE field of Rule lines.
256 zic now allows unambiguous abbreviations like "Sa" and "Su" for
257 weekdays; formerly it rejected them due to a bug. Conversely, zic
258 no longer considers non-prefixes to be abbreviations; for example,
259 it no longer accepts "lF" as an abbreviation for "lastFriday".
260 Also, zic warns about the undocumented usage with a "last-"
261 prefix, e.g., "last-Fri".
263 Similarly, zic now accepts the unambiguous abbreviation "L" for
264 "Link" in ordinary context and for "Leap" in leap-second context.
265 Conversely, zic no longer accepts non-prefixes such as "La" as
266 abbreviations for words like "Leap".
268 zic no longer accepts leap second lines in ordinary input, or
269 ordinary lines in leap second input. Formerly, zic sometimes
270 warned about this undocumented usage and handled it incorrectly.
272 The new macro HAVE_TZNAME governs whether the tzname external
273 variable is exported, instead of USG_COMPAT. USG_COMPAT now
274 governs only the external variables "timezone" and "daylight".
275 This change is needed because the three variables are not in the
276 same category: although POSIX requires tzname, it specifies the
277 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
278 if not defined, the code attempts to guess it from other macros.
280 localtime.c and difftime.c no longer require stdio.h, and .c files
281 other than zic.c no longer require sys/wait.h.
283 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
285 Calculation of time_t extrema works around a bug in GCC 4.8.4
286 (Reported by Stan Shebs and Joseph Myers.)
288 zic.c no longer mistranslates formats of line numbers in non-English
289 locales. (Problem reported by Benno Schulenberg.)
291 Several minor changes have been made to the code to make it a
292 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
293 Dekker for reporting the problems.)
295 Changes to documentation and commentary
297 The two new files 'theory.html' and 'calendars' contain the
298 contents of the removed file 'Theory'. The goal is to document
299 tzdb theory more accessibly.
301 The zic man page now documents abbreviation rules.
303 tz-link.htm now covers how to apply tzdata changes to clients.
304 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
306 The leap-seconds.list URL has been updated to something that is
307 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
309 Release 2017b - 2017-03-17 07:30:38 -0700
311 Briefly: Haiti has resumed DST.
313 Changes to past and future time stamps
315 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
317 Changes to past time stamps
319 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
321 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
322 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
326 The reference localtime implementation now falls back on the
327 current US daylight-saving transition rules rather than the
328 1987-2006 rules. This fallback occurs only when (1) the TZ
329 environment variable's value has a name like "AST4ADT" that asks
330 for daylight saving time but does not specify the rules, (2) there
331 is no file by that name, and (3) the TZDEFRULES file cannot be
332 loaded. (Thanks to Tom Lane.)
335 Release 2017a - 2017-02-28 00:05:36 -0800
337 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
340 Changes to future time stamps
342 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
344 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
345 Its clocks diverge from America/Santiago starting 2017-05-13 at
346 23:00, hiving off a new zone America/Punta_Arenas. Although the
347 Chilean government says this change expires in May 2019, for now
348 assume it's permanent. (Thanks to Juan Correa and Deborah
349 Goldsmith.) This also affects Antarctica/Palmer.
351 Changes to past time stamps
353 Fix many entries for historical time stamps for Europe/Madrid
354 before 1979, to agree with tables compiled by Pere Planesas of the
355 National Astronomical Observatory of Spain. As a side effect,
356 this changes some time stamps for Africa/Ceuta before 1929, which
357 are probably guesswork anyway. (Thanks to Steve Allen and
358 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
359 correcting the 1901 transition.)
361 Ecuador observed DST from 1992-11-28 to 1993-02-05.
362 (Thanks to Alois Treindl.)
364 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
365 (Thanks to Stepan Golosunov.)
367 Changes to past and future time zone abbreviations
369 Switch to numeric time zone abbreviations for South America, as
370 part of the ongoing project of removing invented abbreviations.
371 This avoids the need to invent an abbreviation for the new Chilean
372 new zone. Similarly, switch from invented to numeric time zone
373 abbreviations for Afghanistan, American Samoa, the Azores,
374 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
375 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
376 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
377 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
378 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
379 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
380 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
381 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
382 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
383 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
384 for half-hour daylight saving time in Belize before 1944 and in
385 the Dominican Republic before 1975; and for Canary Islands before
386 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
387 Indian Summer Time before 1942, for Indonesia before around 1964,
388 for Kenya before 1960, for Liberia before 1973, for Madeira before
389 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
390 Pakistan before 1971, for Western Sahara before 1977, and for
391 Zaporozhye in 1880-1924.
393 For Alaska time from 1900 through 1967, instead of "CAT" use the
394 abbreviation "AST", the abbreviation commonly used at the time
395 (Atlantic Standard Time had not been standardized yet). Use "AWT"
396 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
398 Use "CST" and "CDT" instead of invented abbreviations for Macau
399 before 1999 and Taiwan before 1938, and use "JST" instead of the
400 invented abbreviation "JCST" for Japan and Korea before 1938.
402 Change to database entry category
404 Move the Pacific/Johnston link from 'australasia' to 'backward',
405 since Johnston is now uninhabited.
409 zic no longer mishandles some transitions in January 2038 when it
410 attempts to work around Qt bug 53071. This fixes a bug affecting
411 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
412 now contains a workaround, useful when loading a file generated by
413 a buggy zic. (Problem and localtime.c fix reported by Bradley
416 zdump -i now outputs non-hour numeric time zone abbreviations
417 without a colon, e.g., "+0530" rather than "+05:30". This agrees
418 with zic %z and with common practice, and simplifies auditing of
421 zdump is now buildable again with -DUSE_LTZ=0.
422 (Problem reported by Joseph Myers.)
424 zdump.c now always includes private.h, to avoid code duplication
425 with private.h. (Problem reported by Kees Dekker.)
427 localtime.c no longer mishandles early or late timestamps
428 when TZ is set to a POSIX-style string that specifies DST.
429 (Problem reported by Kees Dekker.)
431 date and strftime now cause %z to generate "-0000" instead of
432 "+0000" when the UT offset is zero and the time zone abbreviation
435 Changes to documentation and commentary
437 The 'Theory' file now better documents choice of historical time
438 zone abbreviations. (Problems reported by Michael Deckers.)
440 tz-link.htm now covers leap smearing, which is popular in clouds.
443 Release 2016j - 2016-11-22 23:17:13 -0800
445 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
447 Changes to future time stamps
449 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
450 This hives off a new zone Europe/Saratov from Europe/Volgograd.
451 (Thanks to Yuri Konotopov and Stepan Golosunov.)
453 Changes to past time stamps
455 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
456 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
457 1999, not fall 1994. (Thanks to Stepan Golosunov.)
459 Changes to past time zone abbreviations
461 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
462 summer time before 1948. The old use of "EET" was a typo.
466 zic no longer mishandles file systems that lack hard links, fixing
467 bugs introduced in 2016g. (Problems reported by Tom Lane.)
468 Also, when the destination already contains symbolic links, zic
469 should now work better on systems where the 'link' system call
470 does not follow symbolic links.
472 Changes to documentation and commentary
474 tz-link.htm now documents the relationship between release version
475 numbers and development-repository commit tags. (Suggested by
478 The 'Theory' file now documents UT.
480 iso3166.tab now accents "Curaçao", and commentary now mentions
481 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
484 Release 2016i - 2016-11-01 23:19:52 -0700
486 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
487 reintroduces DST on 2016-11-06.
489 Changes to future time stamps
491 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
492 2017-01-15 at 03:00. Assume future observances in Tonga will be
493 from the first Sunday in November through the third Sunday in
494 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
495 time zone abbreviations for this zone.
497 Changes to past and future time stamps
499 Northern Cyprus is now +03 year round, causing a split in Cyprus
500 time zones starting 2016-10-30 at 04:00. This creates a zone
501 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
503 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
504 (Thanks to Steffen Thorsen.)
506 Changes to past time stamps
508 Several corrections were made for pre-1975 time stamps in Italy.
509 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
512 First, the 1893-11-01 00:00 transition in Italy used the new UT
513 offset (+01), not the old (+00:49:56). (Thanks to Michael
516 Second, rules for daylight saving in Italy were changed to agree
517 with Italy's National Institute of Metrological Research (INRiM)
518 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
519 Inglis, and Michael Deckers):
521 The 1916-06-03 transition was at 24:00, not 00:00.
523 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
526 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
529 The 1944-09-17 transition was at 03:00, not 01:00. This
530 particular change is taken from Italian law as INRiM's table,
531 (which says 02:00) appears to have a typo here. Also, keep the
532 1944-04-03 transition for Europe/Rome, as Rome was controlled by
535 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
540 The code should now be buildable on AmigaOS merely by setting the
541 appropriate Makefile variables. (From a patch by Carsten Larsen.)
544 Release 2016h - 2016-10-19 23:17:57 -0700
546 Changes to future time stamps
548 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
549 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
550 future fall transitions will be on the last Saturday of October
551 at 01:00, which is consistent with predicted spring transitions
552 on the last Saturday of March. (Thanks to Tim Parenti.)
554 Changes to past time stamps
556 In Turkey, transitions in 1986-1990 were at 01:00 standard time
557 not at 02:00, and the spring 1994 transition was on March 20, not
558 March 27. (Thanks to Kıvanç Yazan.)
560 Changes to past and future time zone abbreviations
562 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
563 instead of alphabetic ones like "IST" and "LKT". Various
564 English-language sources use "IST", "LKT" and "SLST", with no
565 working consensus. (Usage of "SLST" mentioned by Sadika
570 zic no longer mishandles relativizing file names when creating
571 symbolic links like /etc/localtime, when these symbolic links
572 are outside the usual directory hierarchy. This fixes a bug
573 introduced in 2016g. (Problem reported by Andreas Stieger.)
575 Changes to build procedure
577 New rules 'traditional_tarballs' and 'traditional_signatures' for
578 building just the traditional-format distribution. (Requested by
581 The file 'version' is now put into the tzdata tarball too.
582 (Requested by Howard Hinnant.)
584 Changes to documentation and commentary
586 The 'Theory' file now has a section on interface stability.
587 (Requested by Paul Koning.) It also mentions features like
588 tm_zone and localtime_rz that have long been supported by the
591 tz-link.htm has improved coverage of time zone boundaries suitable
592 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
595 The US commentary now mentions Allen and the "day of two noons".
597 The Fiji commentary mentions the government's 2016-10-03 press
598 release. (Thanks to Raymond Kumar.)
601 Release 2016g - 2016-09-13 08:56:38 -0700
603 Changes to future time stamps
605 Turkey switched from EET/EEST (+02/+03) to permanent +03,
606 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
607 than an invented abbreviation for the new time.
609 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
610 (Thanks to Tim Parenti.)
612 Changes to past time stamps
614 For America/Los_Angeles, spring-forward transition times have been
615 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
618 For zones using Soviet time on 1919-07-01, transitions to UT-based
619 time were at 00:00 UT, not at 02:00 local time. The affected
620 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
621 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
623 Changes to past and future time zone abbreviations
625 The Factory zone now uses the time zone abbreviation -00 instead
626 of a long English-language string, as -00 is now the normal way to
627 represent an undefined time zone.
629 Several zones in Antarctica and the former Soviet Union, along
630 with zones intended for ships at sea that cannot use POSIX TZ
631 strings, now use numeric time zone abbreviations instead of
632 invented or obsolete alphanumeric abbreviations. The affected
633 zones are Antarctica/Casey, Antarctica/Davis,
634 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
635 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
636 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
637 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
638 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
639 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
640 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
641 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
642 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
643 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
644 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
645 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
646 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
647 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
648 was replaced by +05, whereas MSK and MSD were kept as they are not
649 our invention and are widely used.
651 Changes to zone names
653 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
654 (Thanks to David Massoud.)
658 zic no longer generates binary files containing POSIX TZ-like
659 strings that disagree with the local time type after the last
660 explicit transition in the data. This fixes a bug with
661 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
662 stamps on the reference platform. (Thanks to Alexander Belopolsky
663 for reporting the bug and suggesting a way forward.)
665 If the installed localtime and/or posixrules files are symbolic
666 links, zic now keeps them symbolic links when updating them, for
667 compatibility with platforms like OpenSUSE where other programs
668 configure these files as symlinks.
670 zic now avoids hard linking to symbolic links, avoids some
671 unnecessary mkdir and stat system calls, and uses shorter file
674 zdump has a new -i option to generate transitions in a
675 more-compact but still human-readable format. This option is
676 experimental, and the output format may change in future versions.
677 (Thanks to Jon Skeet for suggesting that an option was needed,
678 and thanks to Tim Parenti and Chris Rovick for further comments.)
680 Changes to build procedure
682 An experimental distribution format is available, in addition
683 to the traditional format which will continue to be distributed.
684 The new format is a tarball tzdb-VERSION.tar.lz with signature
685 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
686 tzdb-VERSION containing the code and data of the traditional
687 two-tarball format, along with extra data that may be useful.
688 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
689 for comments about the experimental format.)
691 The release version number is now more accurate in the usual case
692 where releases are built from a Git repository. For example, if
693 23 commits and some working-file changes have been made since
694 release 2016g, the version number is now something like
695 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
696 Tagged releases use the same version number format as before,
697 e.g., '2016g'. To support the more-accurate version number, its
698 specification has moved from a line in the Makefile to a new
699 source file 'version'.
701 The experimental distribution contains a file to2050.tzs that
702 contains what should be the output of 'zdump -i -c 2050' on
703 primary zones. If this file is available, 'make check' now checks
704 that zdump generates this output.
706 'make check_web' now works on Fedora-like distributions.
708 Changes to documentation and commentary
710 tzfile.5 now documents the new restriction on POSIX TZ-like
711 strings that is now implemented by zic.
713 Comments now cite URLs for some 1917-1921 Russian DST decrees.
714 (Thanks to Alexander Belopolsky.)
716 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
717 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
718 description of Java 8 has been brought up to date (thanks to
719 Stephen Colebourne). Its description of local time on Mars has
720 been updated to match current practice, and URLs have been updated
721 and some obsolete ones removed.
724 Release 2016f - 2016-07-05 16:26:51 +0200
726 Changes affecting future time stamps
728 The Egyptian government changed its mind on short notice, and
729 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
730 (Thanks to Mina Samuel.)
732 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
733 (Thanks to Stepan Golosunov.)
735 Changes to past and future time stamps
737 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
738 abbreviations instead of invented ones.
740 Changes affecting past time stamps
742 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
743 (Thanks to Stepan Golosunov.)
746 Release 2016e - 2016-06-14 08:46:16 -0700
748 Changes affecting future time stamps
750 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
751 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
752 For future years, guess April's last Thursday to October's last
753 Thursday except for Ramadan.
755 Changes affecting past time stamps
757 Locations while uninhabited now use '-00', not 'zzz', as a
758 placeholder time zone abbreviation. This is inspired by Internet
759 RFC 3339 and is more consistent with numeric time zone
760 abbreviations already used elsewhere. The change affects several
761 arctic and antarctic locations, e.g., America/Cambridge_Bay before
762 1920 and Antarctica/Troll before 2005.
764 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
765 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
769 zic now outputs a dummy transition at time 2**31 - 1 in zones
770 whose POSIX-style TZ strings contain a '<'. This mostly works
771 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
772 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
774 Changes affecting documentation and commentary
776 tz-link.htm says why governments should give plenty of notice for
777 time zone or DST changes, and refers to Matt Johnson's blog post.
779 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
782 Release 2016d - 2016-04-17 22:50:29 -0700
784 Changes affecting future time stamps
786 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
787 (Thanks to Alexander Krivenyshev for the heads-up.)
789 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
790 (Thanks to Alexander Krivenyshev and Matt Johnson.)
792 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
793 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
794 at 02:00. (Thanks to Stepan Golosunov.)
796 Changes affecting past time stamps
798 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
799 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
800 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
801 the same change. (Thanks to Stepan Golosunov.)
803 Russia and nearby locations had daylight-saving transitions on
804 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
805 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
808 Many corrections to historical time in Kazakhstan from 1991
809 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
810 invented time zone abbreviations with numeric abbreviations.
812 Changes to commentary
814 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
817 Release 2016c - 2016-03-23 00:51:27 -0700
819 Changes affecting future time stamps
821 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
823 Chile reverts from permanent to seasonal DST. (Thanks to Juan
824 Correa for the heads-up, and to Tim Parenti for corrections.)
825 Guess that future transitions are August's and May's second
826 Saturdays at 24:00 mainland time. Also, call the period from
827 2014-09-07 through 2016-05-14 daylight saving time instead of
828 standard time, as that seems more appropriate now.
830 Changes affecting past time stamps
832 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
833 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
834 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
835 (Thanks to Stepan Golosunov.)
837 Changes to commentary
839 Several updates and URLs for historical and proposed Russian changes.
840 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
843 Release 2016b - 2016-03-12 17:30:14 -0800
847 Starting with release 2016b, some data entries cause zic implementations
848 derived from tz releases 2005j through 2015e to issue warnings like
849 "time zone abbreviation differs from POSIX standard (+03)".
850 These warnings should not otherwise affect zic's output and can safely be
851 ignored on today's platforms, as the warnings refer to a restriction in
852 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
853 warnings is to upgrade to zic derived from tz releases 2015f and later.
855 Changes affecting future time stamps
857 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
858 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
859 2016-03-27 at 02:00 local time. They need distinct zones since their
860 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
861 Altai Republic, Russia, which will switch from +06 to +07 on the same date
862 and local time. The Astrakhan change is already official; the others have
863 passed the first reading in the State Duma and are extremely likely.
864 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
865 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
866 and Stepan Golosunov for followup.)
868 As a trial of a new system that needs less information to be made up,
869 the new zones use numeric time zone abbreviations like "+04"
870 instead of invented abbreviations like "ASTT".
872 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
875 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
876 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
877 Saturday at 01:00, not March's last Friday at 24:00.
879 Changes affecting past time stamps
881 Europe/Chisinau observed DST during 1990, and switched from +04 to
882 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
883 (Thanks to Stepan Golosunov.)
885 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
886 KUYT/KUYST. (Thanks to Stepan Golosunov.)
890 tzselect's diagnostics and checking, and checktab.awk's checking,
891 have been improved. (Thanks to J William Piggott.)
893 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
895 tzselect now tests Julian-date TZ settings more accurately.
896 (Thanks to J William Piggott.)
898 Changes to commentary
900 Comments in zone tables have been improved. (Thanks to J William Piggott.)
902 tzselect again limits its menu comments so that menus fit on a
903 24x80 alphanumeric display.
905 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
907 In the Theory file, the description of possible time zone abbreviations in
908 tzdata has been cleaned up, as the old description was unclear and
909 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
912 Release 2016a - 2016-01-26 23:28:02 -0800
914 Changes affecting future time stamps
916 America/Cayman will not observe daylight saving this year after all.
917 Revert our guess that it would. (Thanks to Matt Johnson.)
919 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
920 (Thanks to Alexander Krivenyshev.)
922 Asia/Tehran now has DST predictions for the year 2038 and later,
923 to be March 21 00:00 to September 21 00:00. This is likely better
924 than predicting no DST, albeit off by a day every now and then.
926 Changes affecting past and future time stamps
928 America/Metlakatla switched from PST all year to AKST/AKDT on
929 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
931 America/Santa_Isabel has been removed, and replaced with a
932 backward compatibility link to America/Tijuana. Its contents were
933 apparently based on a misreading of Mexican legislation.
935 Changes affecting past time stamps
937 Asia/Karachi's two transition times in 2002 were off by a minute.
938 (Thanks to Matt Johnson.)
940 Changes affecting build procedure
942 An installer can now combine leap seconds with use of the backzone file,
943 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
944 The old 'make posix_packrat' rule is now marked as obsolescent.
945 (Thanks to Ian Abbott for an initial implementation.)
947 Changes affecting documentation and commentary
949 A new file LICENSE makes it easier to see that the code and data
950 are mostly public-domain. (Thanks to James Knight.) The three
951 non-public-domain files now use the current (3-clause) BSD license
952 instead of older versions of that license.
954 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
955 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
956 on editing tz source files (with a mention of Sublime zoneinfo,
957 thanks to Gilmore Davidson).
959 The Theory and asia files now mention the 2015 book "The Global
960 Transformation of Time, 1870-1950", and cite a couple of reviews.
962 The America/Chicago entry now documents the informal use of US
963 central time in Fort Pierre, South Dakota. (Thanks to Rick
964 McDermid, Matt Johnson, and Steve Jones.)
967 Release 2015g - 2015-10-01 00:39:51 -0700
969 Changes affecting future time stamps
971 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
974 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
975 (Thanks to Alexander Krivenyshev.)
977 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
978 (Thanks to Ken Rylander.)
980 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
981 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
982 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
984 Changes affecting past time stamps
986 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
988 Changes affecting code
990 localtime no longer mishandles America/Anchorage after 2037.
991 (Thanks to Bradley White for reporting the bug.)
993 On hosts with signed 32-bit time_t, localtime no longer mishandles
994 Pacific/Fiji after 2038-01-16 14:00 UTC.
996 The localtime module allows the variables 'timezone', 'daylight',
997 and 'altzone' to be in common storage shared with other modules,
998 and declares them in case the system <time.h> does not.
999 (Problems reported by Kees Dekker.)
1001 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1002 This simplifies the code and is consistent with zdump.c.
1003 (Problem reported by Christos Zoulas.)
1005 Changes affecting documentation
1007 The tzfile man page now documents that transition times denote the
1008 starts (not the ends) of the corresponding time periods.
1009 (Ambiguity reported by Bill Seymour.)
1012 Release 2015f - 2015-08-10 18:06:56 -0700
1014 Changes affecting future time stamps
1016 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1017 The abbreviation remains "KST". (Thanks to Robert Elz.)
1019 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1022 Changes affecting past and future time stamps
1024 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1025 (Thanks to Roman Tudos.)
1027 Changes affecting data format and code
1029 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1030 field of a Rule line should now be '-'; the old values 'even',
1031 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1032 Although the implementation has not changed, these features do not
1033 work in the default installation, they are not used in the data,
1034 and they are now considered obsolescent.
1036 zic now checks that two rules don't take effect at the same time.
1037 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1038 simultaneity are now documented.
1040 The two characters '%z' in a zone format now stand for the UT
1041 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1042 five hours and thirty minutes ahead. This better supports time
1043 zone abbreviations conforming to POSIX.1-2001 and later.
1045 Changes affecting installed data files
1047 Comments for America/Halifax and America/Glace_Bay have been improved.
1048 (Thanks to Brian Inglis.)
1050 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1051 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1052 installed data files for Europe/Simferopol and Europe/Tallinn.
1053 It does not affect timestamps. (Thanks to Howard Hinnant.)
1055 Changes affecting code
1057 zdump and zic no longer warn about valid time zone abbreviations
1060 Some Visual Studio 2013 warnings have been suppressed.
1061 (Thanks to Kees Dekker.)
1063 'date' no longer sets the time of day and its -a, -d, -n and -t
1064 options have been removed. Long obsolescent, the implementation
1065 of these features had porting problems. Builders no longer need
1066 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1067 (Thanks to Kees Dekker for pointing out the problem.)
1069 Changes affecting documentation
1071 The Theory file mentions naming issues earlier, as these seem to be
1072 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1074 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1076 Mention that Herbert Samuel introduced the term "Summer Time".
1079 Release 2015e - 2015-06-13 10:56:02 -0700
1081 Changes affecting future time stamps
1083 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1084 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1086 Assume Cayman Islands will observe DST starting next year, using US rules.
1087 Although it isn't guaranteed, it is the most likely.
1089 Changes affecting data format
1091 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1092 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1094 Changes affecting code
1096 When displaying data, tzselect converts it to the current locale's
1097 encoding if the iconv command works. (Problem reported by random832.)
1099 tzselect no longer mishandles Dominica, fixing a bug introduced
1100 in Release 2014f. (Problem reported by Owen Leibman.)
1102 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1103 This fixes a bug introduced in Release 2014f.
1104 (Problem reported by Leonardo Chiquitto.)
1107 Release 2015d - 2015-04-24 08:09:46 -0700
1109 Changes affecting future time stamps
1111 Egypt will not observe DST in 2015 and will consider canceling it
1112 permanently. For now, assume no DST indefinitely.
1113 (Thanks to Ahmed Nazmy and Tim Parenti.)
1115 Changes affecting past time stamps
1117 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1118 1966-07-01. Also, Yukon's time zone history is documented better.
1119 (Thanks to Brian Inglis and Dennis Ferguson.)
1121 Change affecting past and future time zone abbreviations
1123 The abbreviations for Hawaii-Aleutian standard and daylight times
1124 have been changed from HAST/HADT to HST/HDT, as per US Government
1125 Printing Office style. This affects only America/Adak since 1983,
1126 as America/Honolulu was already using the new style.
1128 Changes affecting code
1130 zic has some minor performance improvements.
1133 Release 2015c - 2015-04-11 08:55:55 -0700
1135 Changes affecting future time stamps
1137 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1138 not 00:00 on April's last Friday. 2015's transition will therefore be on
1139 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1140 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1142 Changes affecting past time stamps
1144 The following changes affect some pre-1991 Chile-related time stamps
1145 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1147 The 1910 transition was January 10, not January 1.
1149 The 1918 transition was September 10, not September 1.
1151 The UT -04 time observed from 1932 to 1942 is now considered to
1152 be standard time, not year-round DST.
1154 Santiago observed DST (UT -03) from 1946-07-15 through
1155 1946-08-31, then reverted to standard time, then switched to -05
1158 Assume transitions before 1968 were at 00:00, since we have no data
1161 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1162 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1164 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1165 and omit all transitions on Pacific/Easter from 1942 through 1946
1166 since we have no data suggesting that they existed.
1168 One more zone has been turned into a link, as it differed
1169 from an existing zone only for older time stamps. As usual,
1170 this change affects UT offsets in pre-1970 time stamps only.
1171 The zone's old contents have been moved to the 'backzone' file.
1172 The affected zone is America/Montreal.
1174 Changes affecting commentary
1176 Mention the TZUpdater tool.
1178 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1181 Release 2015b - 2015-03-19 23:28:11 -0700
1183 Changes affecting future time stamps
1185 Mongolia will start observing DST again this year, from the last
1186 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1187 (Thanks to Ganbold Tsagaankhuu.)
1189 Palestine will start DST on March 28, not March 27. Also,
1190 correct the fall 2014 transition from September 26 to October 24.
1191 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1193 Changes affecting past time stamps
1195 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1196 regression. (Thanks to Stuart Bishop for reporting the problem.)
1198 Some more zones have been turned into links, when they differed
1199 from existing zones only for older time stamps. As usual,
1200 these changes affect UT offsets in pre-1970 time stamps only.
1201 Their old contents have been moved to the 'backzone' file.
1202 The affected zones are: America/Antigua, America/Cayman,
1203 Pacific/Midway, and Pacific/Saipan.
1205 Changes affecting time zone abbreviations
1207 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1210 Changes affecting code
1212 Fix integer overflow bug in reference 'mktime' implementation.
1213 (Problem reported by Jörg Richter.)
1215 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1216 to be used in the same executable as standard-library time_t functions.
1217 (Problems reported by Bradley White.)
1219 Changes affecting commentary
1221 Cite the recent Mexican decree changing Quintana Roo's time zone.
1222 (Thanks to Carlos Raúl Perasso.)
1224 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1226 Update info about Mars time.
1229 Release 2015a - 2015-01-29 22:35:20 -0800
1231 Changes affecting future time stamps
1233 The Mexican state of Quintana Roo, represented by America/Cancun,
1234 will shift from Central Time with DST to Eastern Time without DST
1235 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1237 Chile will not change clocks in April or thereafter; its new standard time
1238 will be its old daylight saving time. This affects America/Santiago,
1239 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1241 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1242 (Thanks to Tim Parenti.)
1244 Changes affecting past time stamps
1246 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1247 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1248 Shanks about time in Iceland between 1837 and 1908.
1250 Some more zones have been turned into links, when they differed
1251 from existing zones only for older time stamps. As usual,
1252 these changes affect UT offsets in pre-1970 time stamps only.
1253 Their old contents have been moved to the 'backzone' file.
1254 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1257 Changes affecting code
1259 tzalloc now scrubs time zone abbreviations compatibly with the way
1260 that tzset always has, by replacing invalid bytes with '_' and by
1261 shortening too-long abbreviations.
1263 tzselect ports to POSIX awk implementations, no longer mishandles
1264 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1265 settings to the user. (Thanks to Stefan Kuhn.)
1267 Changes affecting build procedure
1269 'make check' now checks for links to links in the data.
1270 One such link (for Africa/Asmera) has been fixed.
1271 (Thanks to Stephen Colebourne for pointing out the problem.)
1273 Changes affecting commentary
1275 The leapseconds file commentary now mentions the expiration date.
1276 (Problem reported by Martin Burnicki.)
1278 Update Mexican Library of Congress URL.
1281 Release 2014j - 2014-11-10 17:37:11 -0800
1283 Changes affecting current and future time stamps
1285 Turks & Caicos' switch from US eastern time to UT -04 year-round
1286 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1287 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1289 Changes affecting past time stamps
1291 Many pre-1989 time stamps have been corrected for Asia/Seoul and
1292 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1293 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1294 longer guess that Pyongyang mimicked Seoul time after World War II,
1295 as this is politically implausible.
1297 Some more zones have been turned into links, when they differed
1298 from existing zones only for older time stamps. As usual,
1299 these changes affect UT offsets in pre-1970 time stamps only.
1300 Their old contents have been moved to the 'backzone' file.
1301 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1302 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1303 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1306 Changes affecting commentary
1308 The commentary is less enthusiastic about Shanks as a source,
1309 and is more careful to distinguish UT from UTC.
1312 Release 2014i - 2014-10-21 22:04:57 -0700
1314 Changes affecting future time stamps
1316 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1317 (Thanks to Ken Rylander for the heads-up.) Guess that future
1318 years will use a similar pattern.
1320 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1321 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1322 (Thanks to Kiley Walbom for the heads-up.)
1324 Changes affecting time zone abbreviations
1326 Since Belarus is not changing its clocks even though Moscow is,
1327 the time zone abbreviation in Europe/Minsk is changing from FET
1328 to its more-traditional value MSK on 2014-10-26 at 01:00.
1329 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1331 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1332 Indochina, to distinguish it better from ICT (+07).
1334 Changes affecting past time stamps
1336 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1337 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1338 authoritative book). Asia/Ho_Chi_Minh has been added to
1339 zone1970.tab, to give tzselect users in Vietnam two choices,
1340 since north and south Vietnam disagreed after our 1970 cutoff.
1342 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1343 they differed from existing zones only for older time stamps. As
1344 usual, these changes affect pre-1970 time stamps only. Their old
1345 contents have been moved to the 'backzone' file.
1347 Changes affecting code
1349 The time-related library functions now set errno on failure, and
1350 some crashes in the new tzalloc-related library functions have
1351 been fixed. (Thanks to Christos Zoulas for reporting most of
1352 these problems and for suggesting fixes.)
1354 If USG_COMPAT is defined and the requested timestamp is standard time,
1355 the tz library's localtime and mktime functions now set the extern
1356 variable timezone to a value appropriate for that timestamp; and
1357 similarly for ALTZONE, daylight saving time, and the altzone variable.
1358 This change is a companion to the tzname change in 2014h, and is
1359 designed to make timezone and altzone more compatible with tzname.
1361 The tz library's functions now set errno to EOVERFLOW if they fail
1362 because the result cannot be represented. ctime and ctime_r now
1363 return NULL and set errno when a timestamp is out of range, rather
1364 than having undefined behavior.
1366 Some bugs associated with the new 2014g functions have been fixed.
1367 This includes a bug that largely incapacitated the new functions
1368 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1369 It also includes some uses of uninitialized variables after tzalloc.
1370 The new code uses the standard type 'ssize_t', which the Makefile
1371 now gives porting advice about.
1373 Changes affecting commentary
1375 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1378 Release 2014h - 2014-09-25 18:59:03 -0700
1380 Changes affecting past timestamps
1382 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1384 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1385 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1387 Some more zones have been turned into links, when they differed
1388 from existing zones only for older timestamps. As usual,
1389 these changes affect UT offsets in pre-1970 timestamps only.
1390 Their old contents have been moved to the 'backzone' file.
1391 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1392 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1393 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1395 Changes affecting code
1397 zdump -V and -v now output gmtoff= values on all platforms,
1398 not merely on platforms defining TM_GMTOFF.
1400 The tz library's localtime and mktime functions now set tzname to a value
1401 appropriate for the requested timestamp, and zdump now uses this
1402 on platforms not defining TM_ZONE, fixing a 2014g regression.
1403 (Thanks to Tim Parenti for reporting the problem.)
1405 The tz library no longer sets tzname if localtime or mktime fails.
1407 zdump -c no longer mishandles transitions near year boundaries.
1408 (Thanks to Tim Parenti for reporting the problem.)
1410 An access to uninitialized data has been fixed.
1411 (Thanks to Jörg Richter for reporting the problem.)
1413 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1414 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1415 and two threads race to initialize data used by gmtime-like functions.
1416 (Thanks to Andy Heninger for reporting the problems.)
1418 Changes affecting build procedure
1420 'make check' now checks better for properly-sorted data.
1422 Changes affecting documentation and commentary
1424 zdump's gmtoff=N output is now documented, and its isdst=D output
1425 is now documented to possibly output D values other than 0 or 1.
1427 zdump -c's treatment of years is now documented to use the
1428 Gregorian calendar and Universal Time without leap seconds,
1429 and its behavior at cutoff boundaries is now documented better.
1430 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1432 Programs are now documented to use the proleptic Gregorian calendar.
1433 (Thanks to Alan Barrett for the suggestion.)
1435 Fractional-second GMT offsets have been documented for civil time
1436 in 19th-century Chennai, Jakarta, and New York.
1439 Release 2014g - 2014-08-28 12:31:23 -0700
1441 Changes affecting future timestamps
1443 Turks & Caicos is switching from US eastern time to UT -04
1444 year-round, modeled as a switch on 2014-11-02 at 02:00.
1445 [As noted in 2014j, this switch was later delayed.]
1447 Changes affecting past timestamps
1449 Time in Russia or the USSR before 1926 or so has been corrected by
1450 a few seconds in the following zones: Asia/Irkutsk,
1451 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1452 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1453 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1454 Vladimir Karpinsky.)
1456 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1457 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1458 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1459 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1460 (Thanks to Stephen Colebourne for pointing to the decree.)
1462 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1464 A new file 'backzone' contains data which may appeal to
1465 connoisseurs of old timestamps, although it is out of scope for
1466 the tz database, is often poorly sourced, and contains some data
1467 that is known to be incorrect. The new file is not recommended
1468 for ordinary use and its entries are not installed by default.
1469 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1470 Isle of Man entries.)
1472 Some more zones have been turned into links, when they differed
1473 from existing zones only for older timestamps. As usual,
1474 these changes affect UT offsets in pre-1970 timestamps only.
1475 Their old contents have been moved to the 'backzone' file.
1476 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1477 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1478 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1480 Changes affecting code
1482 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1483 supplies functions for creating and using objects that represent
1484 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1485 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1486 time2posix_z. They are intended for performance: for example,
1487 localtime_rz (unlike localtime_r) is trivially thread-safe without
1488 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1489 functions, and to Alan Barrett and Jonathan Lennox for helping to
1492 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1493 This lets zdump use tz features even if the system library lacks them.
1494 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1495 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1497 zdump now uses localtime_rz if available, as it's significantly faster,
1498 and it can help zdump better diagnose invalid time zone names.
1499 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1500 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1501 not available, zdump now uses localtime_r and tzset if available,
1502 as this is a bit cleaner and faster than plain localtime. Compile
1503 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1504 lacks these two functions.
1506 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1507 Although not needed for tz's own applications, which are single-threaded,
1508 this supports POSIX better if the tz library is used in multithreaded apps.
1510 Some crashes have been fixed when zdump or the tz library is given
1511 invalid or outlandish input.
1513 The tz library no longer mishandles leap seconds on platforms with
1514 unsigned time_t in time zones that lack ordinary transitions after 1970.
1516 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1517 already defined, to make it easier to configure on common platforms.
1518 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1520 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1521 assumes that reading uninitialized memory yields garbage values
1522 but does not cause other problems such as traps.
1524 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1525 more likely to guess right for ambiguous timestamps near
1526 transitions where tm_isdst does not change.
1528 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1529 strftime_l for compatibility with recent versions of POSIX.
1530 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1531 to 1 on recent POSIX versions, and to 0 otherwise.
1533 tzselect -c now uses a hybrid distance measure that works better
1534 in Africa. (Thanks to Alan Barrett for noting the problem.)
1536 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1537 or when time_tz is defined.
1539 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1540 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1541 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1542 This affects GNU/Linux and similar systems.
1544 For easier maintenance later, some C code has been simplified,
1545 some lint has been removed, and the code has been tweaked so that
1546 plain 'make' is more likely to work.
1548 The C type 'bool' is now used for boolean values, instead of 'int'.
1550 The long-obsolete LOCALE_HOME code has been removed.
1552 The long-obsolete 'gtime' function has been removed.
1554 Changes affecting build procedure
1556 'zdump' no longer links in ialloc.o, as it's not needed.
1558 'make check_time_t_alternatives' no longer assumes GNU diff.
1560 Changes affecting distribution tarballs
1562 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1563 the tzdata tarball instead of the tzcode tarball, since they help
1564 maintain the data. The NEWS and Theory files are now also
1565 distributed in the tzdata tarball, as they're relevant for data.
1566 (Thanks to Alan Barrett for pointing this out.) Also, the
1567 leapseconds.awk file is no longer distributed in the tzcode
1568 tarball, since it belongs in the tzdata tarball (where 2014f
1569 inadvertently also distributed it).
1571 Changes affecting documentation and commentary
1573 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1574 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1577 The man pages have been updated to use function prototypes,
1578 to document thread-safe variants like localtime_r, and to document
1579 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1582 The fields in Link lines have been renamed to be more descriptive
1583 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1584 and LINK-TO has become LINK-NAME.
1586 tz-link.htm mentions the IETF's tzdist working group; Windows
1587 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1589 Some broken URLs have been fixed in the commentary. (Thanks to
1592 Commentary about Philippines DST has been updated, and commentary
1593 on pre-1970 time in India has been added.
1596 Release 2014f - 2014-08-05 17:42:36 -0700
1598 Changes affecting future timestamps
1600 Russia will subtract an hour from most of its time zones on 2014-10-26
1601 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1602 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1603 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1604 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1605 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1606 (Europe/Samara) are not changing their clocks. The changed zones are
1607 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1608 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1609 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1610 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1611 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1612 but not its UTC offset. Two zones are added: Asia/Chita (split
1613 from Asia/Yakutsk, and also with two hours subtracted) and
1614 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1615 subtracted). (Thanks to Tim Parenti for much of the above.)
1617 Changes affecting time zone abbreviations
1619 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1620 and similarly for the other Australian zones. That is, for eastern
1621 standard and daylight saving time the abbreviations are AEST and AEDT
1622 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1623 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1624 This change does not affect UT offsets, only time zone abbreviations.
1625 (Thanks to Rich Tibbett and many others.)
1627 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1628 effective 2014-10-26 at 02:00 local time.
1630 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1631 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1633 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1634 Similarly, prefer EET/EEST for eastern European time in Russia.
1636 Change time zone abbreviations in (western) Samoa to use "ST" and
1637 "DT" suffixes, as this is more likely to match common practice.
1638 Prefix "W" to (western) Samoa time when its standard-time offset
1639 disagrees with that of American Samoa.
1641 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1643 Time zone abbreviations have been updated for Japan's two time
1644 zones used 1896-1937. JWST now stands for Western Standard
1645 Time, and JCST for Central Standard Time (formerly this was CJT).
1646 These abbreviations are now used for time in Korea, Taiwan,
1647 and Sakhalin while controlled by Japan.
1649 Changes affecting past timestamps
1651 China's five zones have been simplified to two, since the post-1970
1652 differences in the other three seem to have been imaginary. The
1653 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1654 removed; backwards-compatibility links still work, albeit with
1655 different behaviors for timestamps before May 1980. Asia/Urumqi's
1656 1980 transition to UT +08 has been removed, so that it is now at
1657 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1658 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1660 Some zones have been turned into links, when they differed from existing
1661 zones only for older UT offsets where data entries were likely invented.
1662 These changes affect UT offsets in pre-1970 timestamps only. This is
1663 similar to the change in release 2013e, except this time for western
1664 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1665 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1666 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1667 Atlantic/St_Helena. This also affects the backwards-compatibility
1668 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1669 Tim Parenti, and David Patte for reporting problems in earlier
1670 versions of this change.)
1672 Asia/Shanghai's pre-standard-time UT offset has been changed from
1673 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1674 transition to standard time has been changed from 1928 to 1901.
1676 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1677 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1678 In 1946 it observed DST from 05-15 through 09-30; in 1947
1679 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1680 (Thanks to Yu-Cheng Chuang.)
1682 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1684 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1685 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1687 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1688 period from 1911 to 1950.
1690 Pacific/Chatham has been changed to New Zealand standard time plus
1691 45 minutes for the period before 1957, reflecting a 1956 remark in
1692 the New Zealand parliament.
1694 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1695 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1696 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1697 not 04-06 at 02:00; and there was no DST in 1920.
1699 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1701 Time in Russia before 1927 or so has been corrected by a few seconds in
1702 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1703 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1704 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1705 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1707 Changes affecting data format
1709 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1710 The new file's extended format allows multiple country codes per zone.
1711 The older file is still installed but is deprecated; its format is
1712 not changing and it will still be distributed for a while, but new
1713 applications should use the new file.
1715 The new file format simplifies maintenance of obscure locations.
1716 To test this, it adds coverage for the Crozet Islands and the
1717 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1719 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1720 It is still ASCII now, but commentary about the switch has been added.
1721 The new file 'zone1970.tab' already uses UTF-8.
1723 Changes affecting code
1725 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1726 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1728 'zic' no longer mishandles input when ignoring case in locales that
1729 are not compatible with English, e.g., unibyte Turkish locales when
1730 compiled with HAVE_GETTEXT.
1732 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1733 they no longer use ASCII '-' as if it were a dash.
1735 'zic' now rejects output file names that contain '.' or '..' components.
1736 (Thanks to Tim Parenti for reporting the problem.)
1738 'zic -v' now warns about output file names that do not follow
1739 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1740 David Olson for starting the ball rolling on this.)
1742 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1744 Changes affecting build procedure
1746 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1747 (Thanks to John Cochran.)
1749 Changes affecting documentation and commentary
1751 The 'Theory' file documents legacy names, the longstanding
1752 exceptions to the POSIX-inspired file name rules.
1754 The 'zic' documentation clarifies the role of time types when
1755 interpreting dates. (Thanks to Arthur David Olson.)
1757 Documentation and commentary now prefer UTF-8 to US-ASCII,
1758 allowing the use of proper accents in foreign words and names.
1759 Code and data have not changed because of this. (Thanks to
1760 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1763 Non-HTML documentation and commentary now use plain-text URLs instead of
1764 HTML insertions, and are more consistent about bracketing URLs when they
1765 are not already surrounded by white space. (Thanks to suggestions by
1768 There is new commentary about Xujiahui Observatory, the five time-zone
1769 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1770 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1771 warlord Jin Shuren in the data.
1773 Commentary about the coverage of each Russian zone has been standardized.
1774 (Thanks to Tim Parenti).
1776 There is new commentary about contemporary timekeeping in Ethiopia.
1778 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1780 There is new commentary about time in Poland in 1919.
1782 Proper credit has been given to DST inventor George Vernon Hudson.
1784 Commentary about time in Metlakatla, AK and Resolute, NU has been
1785 improved, with a new source for the former.
1787 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1790 Commentary about permanent Antarctic bases has been updated.
1792 Several typos have been corrected. (Thanks to Tim Parenti for
1793 contributing some of these fixes.)
1795 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1796 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1797 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1798 (Thanks to a heads-up from Dirkjan Ochtman.)
1800 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1801 have been removed. These obsolescent US Naval Observatory entries were no
1802 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1805 Release 2014e - 2014-06-12 21:53:52 -0700
1807 Changes affecting near-future timestamps
1809 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1810 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1811 switch to standard time at 24:00 the last Thursday before Ramadan, and
1812 back to DST at 00:00 the first Friday after Ramadan.
1814 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1815 to Milamber Space Network.) Guess that from 2015 on Morocco will
1816 temporarily switch to standard time at 03:00 the last Saturday before
1817 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1819 Changes affecting past timestamps
1821 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1822 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1823 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1824 in 1991. (Thanks to Hank W. for reporting the problems.)
1826 Changes affecting commentary
1828 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1829 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1830 removes stale pointers to World Time Explorer and WORLDTIME.
1833 Release 2014d - 2014-05-27 21:34:40 -0700
1835 Changes affecting code
1837 zic no longer generates files containing timestamps before the Big Bang.
1838 This works around GNOME bug 730332
1839 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1840 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1841 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1843 Changes affecting documentation
1845 tz-link.htm now mentions GNOME.
1848 Release 2014c - 2014-05-13 07:44:13 -0700
1850 Changes affecting near-future timestamps
1852 Egypt observes DST starting 2014-05-15 at 24:00.
1853 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1854 Details have not been announced, except that DST will not be observed
1855 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1856 Morocco, and that Egypt's future spring and fall transitions will be the
1857 same as 2010 when it last observed DST, namely April's last Friday at
1858 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1859 that Ramadan transitions will be at 00:00 standard time.
1861 Changes affecting code
1863 zic now generates transitions for minimum time values, eliminating guesswork
1864 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
1866 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1868 Changes affecting commentary and documentation
1870 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1873 Release 2014b - 2014-03-24 21:28:50 -0700
1875 Changes affecting near-future timestamps
1877 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1878 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1880 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1881 Bengt-Inge Larsson.) This is currently an approximation; a better version
1882 will require the zic and localtime fixes mentioned below, and the plan is
1883 to wait for a while until at least the zic fixes propagate.
1885 Changes affecting code
1887 'zic' and 'localtime' no longer reject locations needing four transitions
1888 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1889 Also, 'zic' avoids some unlikely failures due to integer overflow.
1891 Changes affecting build procedure
1893 'make check' now detects Rule lines defined but never used.
1894 The NZAQ rules, an instance of this problem, have been removed.
1896 Changes affecting commentary and documentation
1898 Fix Tuesday/Thursday typo in description of time in Israel.
1899 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1901 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1902 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1903 library supports them.
1905 Add comments about Johnston Island time in the 1960s.
1906 (Thanks to Lyle McElhaney.)
1908 Morocco's 2014 DST start will be as predicted.
1909 (Thanks to Sebastien Willemijns.)
1912 Release 2014a - 2014-03-07 23:30:29 -0800
1914 Changes affecting near-future timestamps
1916 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1917 the heads-up, and to Tim Parenti for simplifying the update.)
1919 Changes affecting past timestamps
1921 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1922 (Thanks to Steffen Thorsen.)
1924 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1925 (not 1992-01-01), and observed DST during the entire next winter.
1926 (Thanks to Vladimir in Moscow via Alois Treindl.)
1928 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1929 (Thanks to Avigdor Finkelstein.)
1931 Changes affecting code
1933 A uninitialized-storage bug in 'localtime' has been fixed.
1934 (Thanks to Logan Chien.)
1936 Changes affecting the build procedure
1938 The settings for 'make check_web' now default to Ubuntu 13.10.
1940 Changes affecting commentary and documentation
1942 The boundary of the US Pacific time zone is given more accurately.
1943 (Thanks to Alan Mintz.)
1945 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1947 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1949 Better descriptions of countries with same time zone history as
1950 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1952 Several changes affect tz-link.htm, the main web page.
1954 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1957 Mention xCal (Internet RFC 6321) and jCal.
1959 Microsoft has some support for tz database names.
1961 CLDR data formats include both XML and JSON.
1963 Mention Maggiolo's map of solar vs standard time.
1964 (Thanks to Arthur David Olson.)
1966 Mention TZ4Net. (Thanks to Matt Johnson.)
1968 Mention the timezone-olson Haskell package.
1970 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1972 Remove moribund links to daylight-savings-time.info and to
1973 Simple Timer + Clocks.
1975 Update two links. (Thanks to Oscar van Vlijmen.)
1977 Fix some formatting glitches, e.g., remove random newlines from
1978 abbr elements' title attributes.
1981 Release 2013i - 2013-12-17 07:25:23 -0800
1983 Changes affecting near-future timestamps:
1985 Jordan switches back to standard time at 00:00 on December 20, 2013.
1986 The 2006-2011 transition schedule is planned to resume in 2014.
1987 (Thanks to Steffen Thorsen.)
1989 Changes affecting past timestamps:
1991 In 2004, Cuba began DST on March 28, not April 4.
1992 (Thanks to Steffen Thorsen.)
1994 Changes affecting code
1996 The compile-time flag NOSOLAR has been removed, as nowadays the
1997 benefit of slightly shrinking runtime table size is outweighed by the
1998 cost of disallowing potential future updates that exceed old limits.
2000 Changes affecting documentation and commentary
2002 The files solar87, solar88, and solar89 are no longer distributed.
2003 They were a negative experiment - that is, a demonstration that
2004 tz data can represent solar time only with some difficulty and error.
2005 Their presence in the distribution caused confusion, as Riyadh
2006 civil time was generally not solar time in those years.
2008 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2011 Release 2013h - 2013-10-25 15:32:32 -0700
2013 Changes affecting current and future timestamps:
2015 Libya has switched its UT offset back to +02 without DST, instead
2016 of +01 with DST. (Thanks to Even Scharning.)
2018 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2019 (Thanks to Gwillim Law.)
2021 Changes affecting future timestamps:
2023 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2024 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2025 (Thanks to Steffen Thorsen.)
2027 Add entries for DST transitions in Morocco in the year 2038.
2028 This avoids some year-2038 glitches introduced in 2013g.
2029 (Thanks to Yoshito Umaoka for reporting the problem.)
2031 Changes affecting API
2033 The 'tzselect' command no longer requires the 'select' command,
2034 and should now work with /bin/sh on more platforms. It also works
2035 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2036 Patrick 'P. J.' McDermott and Alan Barrett.)
2038 Changes affecting code
2040 Fix localtime overflow bugs with 32-bit unsigned time_t.
2042 zdump no longer assumes sscanf returns maximal values on overflow.
2044 Changes affecting the build procedure
2046 The builder can specify which programs to use, if any, instead of
2047 'ar' and 'ranlib', and libtz.a is now built locally before being
2048 installed. (Thanks to Michael Forney.)
2050 A dependency typo in the 'zdump' rule has been fixed.
2051 (Thanks to Andrew Paprocki.)
2053 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2054 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2056 'make clean' no longer removes 'leapseconds', since it's
2057 host-independent and is part of the distribution.
2059 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2061 Changes affecting documentation and commentary
2063 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2064 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2066 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2067 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2068 longer maintained) and for old advisories. SOFA now does C.
2070 Release 2013g - 2013-09-30 21:08:26 -0700
2072 Changes affecting current and near-future timestamps
2074 Morocco now observes DST from the last Sunday in March to the last
2075 Sunday in October, not April to September respectively. (Thanks
2076 to Steffen Thorsen.)
2078 Changes affecting 'zic'
2080 'zic' now runs on platforms that lack both hard links and symlinks.
2081 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2082 Also, fix some bugs on platforms that lack hard links but have symlinks.
2084 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2085 to predict the far future, fixing a bug introduced in 2013e.
2087 Changes affecting the build procedure
2089 The 'leapseconds' file is again put into the tzdata tarball.
2090 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2091 Matt Burgess and Ian Abbott.) The timestamps of these and other
2092 dependent files in tarballs are adjusted more consistently.
2094 Changes affecting documentation and commentary
2096 The README file is now part of the data tarball as well as the code.
2097 It now states that files are public domain unless otherwise specified.
2098 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2099 Its details about the 1989 release moved to a place of honor near
2103 Release 2013f - 2013-09-24 23:37:36 -0700
2105 Changes affecting near-future timestamps
2107 Tocantins will very likely not observe DST starting this spring.
2108 (Thanks to Steffen Thorsen.)
2110 Jordan will likely stay at UT +03 indefinitely, and will not fall
2113 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2115 Changes affecting API
2117 The types of the global variables 'timezone' and 'altzone' (if present)
2118 have been changed back to 'long'. This is required for 'timezone'
2119 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2120 These variables were originally 'long' in the tz code, but were
2121 mistakenly changed to 'time_t' in 1987; nobody reported the
2122 incompatibility until now. The difference matters on x32, where
2123 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2125 Changes affecting the build procedure
2127 Avoid long strings in leapseconds.awk to work around a mawk bug.
2128 (Thanks to Cyril Baurand.)
2130 Changes affecting documentation and commentary
2132 New file 'NEWS' that contains release notes like this one.
2134 Paraguay's law does not specify DST transition time; 00:00 is customary.
2135 (Thanks to Waldemar Villamayor-Venialbo.)
2137 Minor capitalization fixes.
2139 Changes affecting version-control only
2141 The experimental GitHub repository now contains annotated and
2142 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2143 Releases are tagged starting with 2012e; earlier releases were
2144 done differently, and tags would either not have a simple name or
2145 not exactly match what was released.
2147 'make set-timestamps' is now simpler and a bit more portable.
2150 Release 2013e - 2013-09-19 23:50:04 -0700
2152 Changes affecting near-future timestamps
2154 This year Fiji will start DST on October 27, not October 20.
2155 (Thanks to David Wheeler for the heads-up.) For now, guess that
2156 Fiji will continue to spring forward the Sunday before the fourth
2159 Changes affecting current and future time zone abbreviations
2161 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2162 time zone abbreviations since 1932. (Thanks to George Ziegler,
2163 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2164 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2165 Asia/Makassar, and Asia/Pontianak.
2167 Use ART (UT -03, standard time), rather than WARST (also -03, but
2168 daylight saving time) for San Luis, Argentina since 2009.
2170 Changes affecting Godthåb timestamps after 2037 if version mismatch
2172 Allow POSIX-like TZ strings where the transition time's hour can
2173 range from -167 through 167, instead of the POSIX-required 0
2174 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2175 new Fiji rules. This is a more-compact way to represent
2176 far-future timestamps for America/Godthab, America/Santiago,
2177 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2178 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2179 this change. (Derived from a suggestion by Arthur David Olson.)
2181 Allow POSIX-like TZ strings where daylight saving time is in
2182 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2183 Argentina Summer Time all year. This supports a more-compact way
2184 to represent the 2013d data for America/Argentina/San_Luis.
2185 Because of the change for San Luis noted above this change does not
2186 affect the current data. (Thanks to Andrew Main (Zefram) for
2187 suggestions that improved this change.)
2189 Where these two TZ changes take effect, there is a minor extension
2190 to the tz file format in that it allows new values for the
2191 embedded TZ-format string, and the tz file format version number
2192 has therefore been increased from 2 to 3 as a precaution.
2193 Version-2-based client code should continue to work as before for
2194 all timestamps before 2038. Existing version-2-based client code
2195 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2196 files, and typically works in practice even for timestamps after
2197 2037; the only known exception is America/Godthab.
2199 Changes affecting timestamps before 1970
2201 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2202 some errors before 1947.
2204 Some zones have been turned into links, when they differ from existing
2205 zones only in older data entries that were likely invented or that
2206 differ only in LMT or transitions from LMT. These changes affect
2207 only timestamps before 1943. The affected zones are:
2208 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2209 America/Grenada, America/Guadeloupe, America/Marigot,
2210 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2211 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2212 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2213 confirming that the old Europe/Vaduz zone was wrong and the new
2214 link is better for WWII-era times.)
2216 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2217 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2220 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2221 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2224 Change the date of the circa-1850 Zurich transition from 1849-09-12
2225 to 1853-07-16, overriding Shanks with data from Messerli about
2226 postal and telegraph time in Switzerland.
2228 Changes affecting time zone abbreviations before 1970
2230 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2231 as Jakarta was called Batavia back then.
2233 Changes affecting API
2235 The 'zic' command now outputs a dummy transition when far-future
2236 data can't be summarized using a TZ string, and uses a 402-year
2237 window rather than a 400-year window. For the current data, this
2238 affects only the Asia/Tehran file. It does not affect any of the
2239 timestamps that this file represents, so zdump outputs the same
2240 information as before. (Thanks to Andrew Main (Zefram).)
2242 The 'date' command has a new '-r' option, which lets you specify
2243 the integer time to display, a la FreeBSD.
2245 The 'tzselect' command has two new options '-c' and '-n', which lets you
2246 select a zone based on latitude and longitude.
2248 The 'zic' command's '-v' option now warns about constructs that
2249 require the new version-3 binary file format. (Thanks to Arthur
2250 David Olson for the suggestion.)
2252 Support for floating-point time_t has been removed.
2253 It was always dicey, and POSIX no longer requires it.
2254 (Thanks to Eric Blake for suggesting to the POSIX committee to
2255 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2256 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2257 bugs and elucidating some of the corners of the old floating-point
2260 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2261 changed back to the old practice of using 'long' to represent UT
2262 offsets. This had been inadvertently and mistakenly changed to
2263 'int_fast32_t'. (Thanks to Christos Zoulas.)
2265 The code avoids undefined behavior on integer overflow in some
2266 more places, including gmtime, localtime, mktime and zdump.
2268 Changes affecting the zdump utility
2270 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2271 "UTC" does not make sense for timestamps that predate the introduction
2272 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2273 for clarifying UT vs UTC.)
2275 Data changes affecting behavior of tzselect and similar programs
2277 Country code BQ is now called the more-common name "Caribbean Netherlands"
2278 rather than the more-official "Bonaire, St Eustatius & Saba".
2280 Remove from zone.tab the names America/Montreal, America/Shiprock,
2281 and Antarctica/South_Pole, as they are equivalent to existing
2282 same-country-code zones for post-1970 timestamps. The data entries for
2283 these names are unchanged, so the names continue to work as before.
2285 Changes affecting code internals
2287 zic -c now runs way faster on 64-bit hosts when given large numbers.
2289 zic now uses vfprintf to avoid allocating and freeing some memory.
2291 tzselect now computes the list of continents from the data,
2292 rather than have it hard-coded.
2294 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2296 Changes affecting the build procedure
2298 The 'leapseconds' file is now generated automatically from a
2299 new file 'leap-seconds.list', which is a copy of
2300 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2301 A new source file 'leapseconds.awk' implements this.
2302 The goal is simplification of the future maintenance of 'leapseconds'.
2304 When building the 'posix' or 'right' subdirectories, if the
2305 subdirectory would be a copy of the default subdirectory, it is
2306 now made a symbolic link if that is supported. This saves about
2307 2 MB of file system space.
2309 The links America/Shiprock and Antarctica/South_Pole have been
2310 moved to the 'backward' file. This affects only nondefault builds
2311 that omit 'backward'.
2313 Changes affecting version-control only
2315 .gitignore now ignores 'date'.
2317 Changes affecting documentation and commentary
2319 Changes to the 'tzfile' man page
2321 It now mentions that the binary file format may be extended in
2322 future versions by appending data.
2324 It now refers to the 'zdump' and 'zic' man pages.
2326 Changes to the 'zic' man page
2328 It lists conditions that elicit a warning with '-v'.
2330 It says that the behavior is unspecified when duplicate names
2331 are given, or if the source of one link is the target of another.
2333 Its examples are updated to match the latest data.
2335 The definition of white space has been clarified slightly.
2336 (Thanks to Michael Deckers.)
2338 Changes to the 'Theory' file
2340 There is a new section about the accuracy of the tz database,
2341 describing the many ways that errors can creep in, and
2342 explaining why so many of the pre-1970 timestamps are wrong or
2343 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2344 Wollman for discussions that contributed to this).
2346 The 'Theory' file describes LMT better (this follows a
2347 suggestion by Guy Harris).
2349 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2351 It's mentioned that excluding 'backward' should not affect the
2352 other data, and it suggests at least one zone.tab name per
2353 inhabited country (thanks to Stephen Colebourne).
2355 Some longstanding restrictions on names are documented, e.g.,
2356 'America/New_York' precludes 'America/New_York/Bronx'.
2358 It gives more reasons for the 1970 cutoff.
2360 It now mentions which time_t variants are supported, such as
2361 signed integer time_t. (Thanks to Paul Goyette for reporting
2362 typos in an experimental version of this change.)
2364 (Thanks to Philip Newton for correcting typos in these changes.)
2366 Documentation and commentary is more careful to distinguish UT in
2367 general from UTC in particular. (Thanks to Steve Allen.)
2369 Add a better source for the Zurich 1894 transition.
2370 (Thanks to Pierre-Yves Berger.)
2372 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2375 Release 2013d - 2013-07-05 07:38:01 -0700
2377 Changes affecting future timestamps:
2379 Morocco's midsummer transitions this year are July 7 and August 10,
2380 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2382 Israel now falls back on the last Sunday of October.
2383 (Thanks to Ephraim Silverberg.)
2385 Changes affecting past timestamps:
2387 Specify Jerusalem's location more precisely; this changes the pre-1880
2390 Changing affecting metadata only:
2392 Fix typos in the entries for country codes BQ and SX.
2394 Changes affecting code:
2396 Rework the code to fix a bug with handling Australia/Macquarie on
2397 32-bit hosts (thanks to Arthur David Olson).
2399 Port to platforms like NetBSD, where time_t can be wider than long.
2401 Add support for testing time_t types other than the system's.
2402 Run 'make check_time_t_alternatives' to try this out.
2403 Currently, the tests fail for unsigned time_t;
2404 this should get fixed at some point.
2406 Changes affecting documentation and commentary:
2408 Deemphasize the significance of national borders.
2410 Update the zdump man page.
2412 Remove obsolete NOID comment (thanks to Denis Excoffier).
2414 Update several URLs and comments in the web pages.
2416 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2418 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2421 Release 2013c - 2013-04-19 16:17:40 -0700
2423 Changes affecting current and future timestamps:
2425 Palestine observed DST starting March 29, 2013. (Thanks to
2426 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2427 with the predicted rules being the last Thursday in March at 24:00
2428 to the first Friday on or after September 21 at 01:00.
2430 Assume that the recent change to Paraguay's DST rules is permanent,
2431 by moving the end of DST to the 4th Sunday in March every year.
2432 (Thanks to Carlos Raúl Perasso.)
2434 Changes affecting past timestamps:
2436 Fix some historical data for Palestine to agree with that of
2437 timeanddate.com, as follows:
2439 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2442 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2445 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2447 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2449 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2451 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2453 Fix times of habitation for Macquarie to agree with the Tasmania
2454 Parks & Wildlife Service history, which indicates that permanent
2455 habitation was 1899-1919 and 1948 on.
2457 Changing affecting metadata only:
2459 Macquarie Island is politically part of Australia, not Antarctica.
2460 (Thanks to Tobias Conradi.)
2462 Sort Macquarie more-consistently with other parts of Australia.
2463 (Thanks to Tim Parenti.)
2466 Release 2013b - 2013-03-10 22:33:40 -0700
2468 Changes affecting current and future timestamps:
2470 Haiti uses US daylight-saving rules this year, and presumably future years.
2471 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2473 Paraguay will end DST on March 24 this year.
2474 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2476 Morocco does not observe DST during Ramadan;
2477 try to predict Ramadan in Morocco as best we can.
2478 (Thanks to Erik Homoet for the heads-up.)
2480 Changes affecting commentary:
2482 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2483 Update URL for Solaris. Mention Internet RFC 6557.
2484 Update Internet RFCs 2445->5545, 2822->5322.
2485 Switch from FTP to HTTP for Internet RFCs.
2488 Release 2013a - 2013-02-27 09:20:35 -0800
2490 Change affecting binary data format:
2492 The zone offset at the end of version-2-format zone files is now
2493 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2495 Changes affecting current and future timestamps:
2497 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2498 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2499 (Thanks to Steffen Thorsen and Robert Elz.)
2501 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2502 (Thanks to Tobias Conradi and Arthur David Olson.)
2504 Many changes affect historical timestamps before 1940.
2505 These were deduced from: Milne J. Civil time. Geogr J. 1899
2506 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2508 Changes affecting the code:
2510 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2511 the data). (Thanks to Arthur David Olson.)
2513 Fix localtime bug when time_t is unsigned and data files were generated
2514 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2515 to Arthur David Olson for fixing.)
2517 Allow the email address for bug reports to be set by the packager.
2518 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2520 Update HTML checking to be compatible with Ubuntu 12.10.
2522 Check that files are a safe subset of ASCII. At some point we may
2523 relax this requirement to a safe subset of UTF-8. Without the
2524 check, some non-UTF-8 encodings were leaking into the distribution.
2528 Restore a comment about copyright notices that was inadvertently deleted.
2529 (Thanks to Arthur David Olson.)
2531 Improve the commentary about which districts observe what times
2532 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2534 Add web page links to tz.js.
2536 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2539 Release 2012j - 2012-11-12 18:34:49 -0800
2541 Libya moved to CET this weekend, but with DST planned next year.
2542 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2544 Signatures now have the extension .asc, not .sign, as that's more
2545 standard. (Thanks to Phil Pennock.)
2547 The output of 'zdump --version', and of 'zic --version', now
2548 uses a format that is more typical for --version.
2549 (Thanks to Joseph S. Myers.)
2551 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2552 now uses tz@iana.org rather than the old elsie address.
2554 zic -v now complains about abbreviations that are less than 3
2555 or more than 6 characters, as per Posix. Formerly, it checked
2556 for abbreviations that were more than 3.
2558 'make public' no longer puts its temporary directory under /tmp,
2559 and uses the just-built zic rather than the system zic.
2561 Various fixes to documentation and commentary.
2564 Release 2012i - 2012-11-03 12:57:09 -0700
2566 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2568 Linker flags can now be specified via LDFLAGS.
2569 AWK now defaults to 'awk', not 'nawk'.
2570 The shell in tzselect now defaults to /bin/bash, but this can
2571 be overridden by specifying KSHELL.
2572 The main web page now mentions the unofficial GitHub repository.
2573 (Thanks to Mike Frysinger.)
2575 Tarball signatures can now be built by running 'make signatures'.
2576 There are also new makefile rules 'tarballs', 'check_public', and
2577 separate makefile rules for each tarball and signature file.
2578 A few makefile rules are now more portable to strict POSIX.
2580 The main web page now lists the canonical IANA URL.
2583 Release 2012h - 2012-10-26 22:49:10 -0700
2585 Bahia no longer has DST. (Thanks to Kelley Cook.)
2587 Tocantins has DST. (Thanks to Rodrigo Severo.)
2589 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2591 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2595 More C modernization, except that at Arthur David Olson's suggestion
2596 the instances of 'register' were kept.
2599 Release 2012g - 2012-10-17 20:59:45 -0700
2601 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2603 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2607 To attack the version-number problem, this release ships the file
2608 'Makefile' (which contains the release number) in both the tzcode and
2609 the tzdata tarballs. The two Makefiles are identical, and should be
2610 identical in any matching pair of tarballs, so it shouldn't matter
2611 which order you extract the tarballs. Perhaps we can come up with a
2612 better version-number scheme at some point; this scheme does have the
2613 virtue of not adding more files.
2616 Release 2012f - 2012-09-12 23:17:03 -0700
2618 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2619 20 this year. (Thanks to Steffen Thorsen.)
2622 Release 2012e - 2012-08-02 20:44:55 -0700
2624 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2625 (Thanks to Steffen Thorsen.)
2627 * Use a single version number for both code and data.
2629 * .gitignore: New file.
2631 * Remove trailing white space.
2634 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2636 Changes for Morocco's timestamps, which take effect in a couple of
2637 hours, along with infrastructure changes to accommodate how the tz
2638 code and data are released on IANA.
2641 Release data2012c - 2012-03-27 12:17:25 -0400
2644 Summer time changes for Morocco (to start late April 2012)
2647 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2650 Haiti following US/Canada rules for 2012 (and we're assuming,
2651 for now anyway, for the future).
2654 Release 2012b - 2012-03-02 12:29:15 +0700
2656 There is just one change to tzcode2012b (compared with 2012a):
2657 the Makefile that was accidentally included with 2012a has been
2658 replaced with the version that should have been there, which is
2659 identical with the previous version (from tzcode2011i).
2661 There are just two changes in tzdata2012b compared with 2012a.
2663 Most significantly, summer time in Cuba has been delayed 3 weeks
2664 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2665 date, as listed in 2012a) is just a little over a week away, this
2668 Less importantly, an excess tab in one of the changes in zone.tab
2669 in 2012a has been removed.
2672 Release 2012a - 2012-03-01 18:28:10 +0700
2674 The changes in tzcode2012a (compared to the previous version, 2011i)
2675 are entirely to the README and tz-art.htm and tz-link.htm files, if
2676 none of those concern you, you can ignore the code update. The changes
2677 reflect the changed addresses for the mailing list and the code and
2678 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2679 has been added to tz-link.htm).
2681 In tzdata2012a (compared to the previous release, which was 2011n)
2682 the major changes are:
2683 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2684 Falkland Islands onto permanent summer time (we're assuming for the
2685 foreseeable future, though 2012 is all we're fairly certain of.)
2686 Armenia has abolished Summer Time.
2687 Tokelau jumped the International Date Line back last December
2688 (just the same as their near neighbour, Samoa).
2689 America/Creston is a new zone for a small area of British Columbia
2690 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2692 Other minor changes are:
2693 Corrections to 1918 Canadian summer time end dates.
2694 Updated URL for UK time zone history (in comments)
2695 A few typos in Le Corre's list of free French place names (comments)
2698 Release data2011n - 2011-10-30 14:57:54 +0700
2700 There are three changes of note - most urgently, Cuba (America/Havana)
2701 has extended summer time by two weeks, now to end on Nov 13, rather than
2702 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2703 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2704 all, and consequently that zone has been removed (again) and reinstated
2705 in the "backward" file as a link to Europe/Chisinau. And third, the
2706 end date for Fiji's summer time this summer was moved forward from the
2707 earlier planned Feb 26, to Jan 22.
2709 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2710 (and the incorrect syntax that was in the 2011m version of that file
2711 is so fixed - it would have been fixed in a different way had this
2712 change not happened - that's the "missing" sccs version id).
2715 Release data2011m - 2011-10-24 21:42:16 +0700
2717 In particular, the typos in comments in the data (2011-11-17 should have
2718 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2719 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2720 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2721 Tim Parenti, and also Denys Gavrysh)
2723 In addition, I added Europe/Tiraspol to zone.tab.
2725 This time, all the files have new version numbers... (including the files
2726 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2727 version numbers there...)
2730 Release data2011l - 2011-10-10 11:15:43 +0700
2732 There are just 2 changes that cause different generated tzdata files from
2733 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2734 is included, but commented out. Compared with the diff I sent out last week,
2735 this version also includes attributions for the sources for the changes
2736 (in much the same format as ado used, but the html tags have not been
2737 checked, verified, or used in any way at all, so if there are errors there,
2738 please let me know.)
2741 Release data2011k - 2011-09-20 17:54:03 -0400
2746 Release data2011j - 2011-09-12 09:22:49 -0400
2748 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2749 Tanzania); there are also two spelling corrections to comments in
2750 the australasia file (with thanks to Christos Zoulas).
2753 Release 2011i - 2011-08-29 05:56:32 -0400
2758 Release data2011h - 2011-06-15 18:41:48 -0400
2760 Russia and Curaçao changes
2763 Release 2011g - 2011-04-25 09:07:22 -0400
2765 update the rules for Egypt to reflect its abandonment of DST this year
2768 Release 2011f - 2011-04-06 17:14:53 -0400
2773 Release 2011e - 2011-03-31 16:04:38 -0400
2775 Morocco, Chile, and tz-link changes
2778 Release 2011d - 2011-03-14 09:18:01 -0400
2780 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2783 Release 2011c - 2011-03-07 09:30:09 -0500
2785 These do affect current timestamps in Chile and Annette Island, Canada.
2788 Release 2011b - 2011-02-07 08:44:50 -0500
2793 Release 2011a - 2011-01-24 10:30:16 -0500
2798 Release data2010o - 2010-11-01 09:18:23 -0400
2800 change to the end of DST in Fiji in 2011
2803 Release 2010n - 2010-10-25 08:19:17 -0400
2808 Release 2010m - 2010-09-27 09:24:48 -0400
2810 Hong Kong, Vostok, and zic.c changes
2813 Release 2010l - 2010-08-16 06:57:25 -0400
2818 Release 2010k - 2010-07-26 10:42:27 -0400
2823 Release 2010j - 2010-05-10 09:07:48 -0400
2825 changes for Bahía de Banderas and for version naming
2828 Release data2010i - 2010-04-16 18:50:45 -0400
2830 the end of DST in Morocco on 2010-08-08
2833 Release data2010h - 2010-04-05 09:58:56 -0400
2838 Release data2010g - 2010-03-24 11:14:53 -0400
2843 Release 2010f - 2010-03-22 09:45:46 -0400
2848 Release data2010e - 2010-03-08 14:24:27 -0500
2850 corrects the Dhaka bug found by Danvin Ruangchan
2853 Release data2010d - 2010-03-06 07:26:01 -0500
2858 Release 2010c - 2010-03-01 09:20:58 -0500
2860 changes including KRE's suggestion for earlier initialization of
2861 "goahead" and "goback" structure elements
2864 Release code2010a - 2010-02-16 10:40:04 -0500
2869 Release data2010b - 2010-01-20 12:37:01 -0500
2874 Release data2010a - 2010-01-18 08:30:04 -0500
2879 Release data2009u - 2009-12-26 08:32:28 -0500
2881 changes to DST in Bangladesh
2884 Release 2009t - 2009-12-21 13:24:27 -0500
2889 Release data2009s - 2009-11-14 10:26:32 -0500
2891 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2894 Release 2009r - 2009-11-09 10:10:31 -0500
2896 "antarctica" and "tz-link.htm" changes
2899 Release 2009q - 2009-11-02 09:12:40 -0500
2901 with two corrections as reported by Eric Muller and Philip Newton
2904 Release data2009p - 2009-10-23 15:05:27 -0400
2906 Argentina (including San Luis) changes (with the correction from
2910 Release data2009o - 2009-10-14 16:49:38 -0400
2912 Samoa (commentary only), Pakistan, and Bangladesh changes
2915 Release data2009n - 2009-09-22 15:13:38 -0400
2917 added commentary for Argentina and a change to the end of DST in
2921 Release data2009m - 2009-09-03 10:23:43 -0400
2923 Samoa and Palestine changes
2926 Release data2009l - 2009-08-14 09:13:07 -0400
2928 Samoa (comments only) and Egypt
2931 Release 2009k - 2009-07-20 09:46:08 -0400
2936 Release data2009j - 2009-06-15 06:43:59 -0400
2938 Bangladesh change (with a short turnaround since the DST change is
2942 Release 2009i - 2009-06-08 09:21:22 -0400
2944 updating for DST in Bangladesh this year
2947 Release 2009h - 2009-05-26 09:19:14 -0400
2952 Release data2009g - 2009-04-20 16:34:07 -0400
2957 Release data2009f - 2009-04-10 11:00:52 -0400
2959 correct DST in Pakistan
2962 Release 2009e - 2009-04-06 09:08:11 -0400
2967 Release 2009d - 2009-03-23 09:38:12 -0400
2969 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2972 Release data2009c - 2009-03-16 09:47:51 -0400
2974 change to the start of Cuban DST
2977 Release 2009b - 2009-02-09 11:15:22 -0500
2982 Release 2009a - 2009-01-21 10:09:39 -0500
2987 Release data2008i - 2008-10-21 12:10:25 -0400
2989 southamerica and zone.tab files, with Argentina DST rule changes and
2990 United States zone reordering and recommenting
2993 Release 2008h - 2008-10-13 07:33:56 -0400
2998 Release 2008g - 2008-10-06 09:03:18 -0400
3000 Fix a broken HTML anchor and update Brazil's DST transitions;
3001 there's also a slight reordering of information in tz-art.htm.
3004 Release data2008f - 2008-09-09 22:33:26 -0400
3009 Release 2008e - 2008-07-28 14:11:17 -0400
3011 changes by Arthur David Olson and Jesper Nørgaard Welen
3014 Release data2008d - 2008-07-07 09:51:38 -0400
3016 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3019 Release data2008c - 2008-05-19 17:48:03 -0400
3021 Pakistan, Morocco, and Mongolia
3024 Release data2008b - 2008-03-24 08:30:59 -0400
3026 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3030 Release 2008a - 2008-03-08 05:42:16 -0500
3035 Release 2007k - 2007-12-31 10:25:22 -0500
3037 most importantly, changes to the "southamerica" file based on
3038 Argentina's readoption of daylight saving time
3041 Release 2007j - 2007-12-03 09:51:01 -0500
3043 1. eliminate the "P" (parameter) macro;
3045 2. the "noncontroversial" changes circulated on the time zone
3046 mailing list (less the changes to "logwtmp.c");
3048 3. eliminate "too many transition" errors when "min" is used in time
3051 4. changes by Paul Eggert (including updated information for Venezuela).
3054 Release data2007i - 2007-10-30 10:28:11 -0400
3056 changes for Cuba and Syria
3059 Release 2007h - 2007-10-01 10:05:51 -0400
3061 changes by Paul Eggert, as well as an updated link to the ICU
3062 project in tz-link.htm
3065 Release 2007g - 2007-08-20 10:47:59 -0400
3067 changes by Paul Eggert
3069 The "leapseconds" file has been updated to incorporate the most
3070 recent International Earth Rotation and Reference Systems Service
3073 There's an addition to tz-art.htm regarding the television show "Medium".
3076 Release 2007f - 2007-05-07 10:46:46 -0400
3078 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3081 changes to zic.c to allow hour values greater than 24 (along with
3082 Paul's improved time value overflow checking)
3085 Release 2007e - 2007-04-02 10:11:52 -0400
3087 Syria and Honduras changes by Paul Eggert
3089 zic.c variable renaming changes by Arthur David Olson
3092 Release 2007d - 2007-03-20 08:48:30 -0400
3094 changes by Paul Eggert
3096 the elimination of white space at the ends of lines
3099 Release 2007c - 2007-02-26 09:09:37 -0500
3101 changes by Paul Eggert
3104 Release 2007b - 2007-02-12 09:34:20 -0500
3106 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3108 changes to the commentary in "leapseconds" reflecting the IERS
3109 announcement that there is to be no positive leap second at the end
3113 Release 2007a - 2007-01-08 12:28:29 -0500
3115 changes by Paul Eggert
3117 Derick Rethan's Asmara change
3119 Oscar van Vlijmen's Easter Island local mean time change
3121 symbolic link changes
3124 Release 2006p - 2006-11-27 08:54:27 -0500
3126 changes by Paul Eggert
3129 Release 2006o - 2006-11-06 09:18:07 -0500
3131 changes by Paul Eggert
3134 Release 2006n - 2006-10-10 11:32:06 -0400
3136 changes by Paul Eggert
3139 Release 2006m - 2006-10-02 15:32:35 -0400
3141 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3143 (minimalist) changes to zic.8 to clarify "until" information
3146 Release data2006l - 2006-09-18 12:58:11 -0400
3148 Paul's best-effort work on this coming weekend's Egypt time change
3151 Release 2006k - 2006-08-28 12:19:09 -0400
3153 changes by Paul Eggert
3156 Release 2006j - 2006-08-21 09:56:32 -0400
3158 changes by Paul Eggert
3161 Release code2006i - 2006-08-07 12:30:55 -0400
3165 Ken Pizzini's conversion script
3168 Release code2006h - 2006-07-24 09:19:37 -0400
3170 adds public domain notices to four files
3172 includes a fix for transition times being off by a second
3174 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3177 Release 2006g - 2006-05-08 17:18:09 -0400
3179 northamerica changes by Paul Eggert
3182 Release 2006f - 2006-05-01 11:46:00 -0400
3184 a missing version number problem is fixed (with thanks to Bradley
3185 White for catching the problem)
3188 Release 2006d - 2006-04-17 14:33:43 -0400
3190 changes by Paul Eggert
3192 added new items to tz-arts.htm that were found by Paul
3195 Release 2006c - 2006-04-03 10:09:32 -0400
3197 two sets of data changes by Paul Eggert
3199 a fencepost error fix in zic.c
3201 changes to zic.c and the "europe" file to minimize differences
3202 between output produced by the old 32-bit zic and the new 64-bit
3206 Release 2006b - 2006-02-20 10:08:18 -0500
3207 [tz32code2006b + tz64code2006b + tzdata2006b]
3211 All SCCS IDs were bumped to "8.1" for this release.
3214 Release 2006a - 2006-01-30 08:59:31 -0500
3216 changes by Paul Eggert (in particular, Indiana time zone moves)
3218 an addition to the zic manual page to describe how special-case
3219 transitions are handled
3222 Release 2005r - 2005-12-27 09:27:13 -0500
3224 Canadian changes by Paul Eggert
3226 They also add "<pre>" directives to time zone data files and reflect
3227 changes to warning message logic in "zdump.c" (but with calls to
3228 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3231 Release 2005q - 2005-12-13 09:17:09 -0500
3233 Nothing earth-shaking here:
3234 1. Electronic mail addresses have been removed.
3235 2. Casts of the return value of exit have been removed.
3236 3. Casts of the argument of is.* macros have been added.
3237 4. Indentation in one section of zic.c has been fixed.
3238 5. References to dead URLs in the data files have been dealt with.
3241 Release 2005p - 2005-12-05 10:30:53 -0500
3243 "systemv", "tz-link.htm", and "zdump.c" changes
3244 (less the casts of arguments to the is* macros)
3247 Release 2005o - 2005-11-28 10:55:26 -0500
3249 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3251 zdump.c lint fixes by Arthur David Olson
3254 Release 2005n - 2005-10-03 09:44:09 -0400
3256 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3260 Release 2005m - 2005-08-29 12:15:40 -0400
3262 changes by Paul Eggert (with a small tweak to the tz-art change)
3264 a declaration of an unused variable has been removed from zdump.c
3267 Release 2005l - 2005-08-22 12:06:39 -0400
3269 changes by Paul Eggert
3271 overflow/underflow checks by Arthur David Olson, minus changes to
3272 the "Theory" file about the pending addition of 64-bit data (I grow
3273 less confident of the changes being accepted with each passing day,
3274 and the changes no longer increase the data files nine-fold--there's
3275 less than a doubling in size by my local Sun's reckoning)
3278 Release 2005k - 2005-07-14 14:14:24 -0400
3280 The "leapseconds" file has been edited to reflect the recently
3281 announced leap second at the end of 2005.
3283 I've also deleted electronic mail addresses from the files as an
3287 Release 2005j - 2005-06-13 14:34:13 -0400
3289 These reflect changes to limit the length of time zone abbreviations
3290 and the characters used in those abbreviations.
3292 There are also changes to handle POSIX-style "quoted" time zone
3293 environment variables.
3295 The changes were circulated on the time zone mailing list; the only
3296 change since then was the removal of a couple of minimum-length of
3297 abbreviation checks.
3300 Release data2005i - 2005-04-21 15:04:16 -0400
3302 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3305 Release 2005h - 2005-04-04 11:24:47 -0400
3307 changes by Paul Eggert
3309 minor changes to Makefile and zdump.c to produce more useful output
3310 when doing a "make typecheck"
3313 Release 2005g - 2005-03-14 10:11:21 -0500
3315 changes by Paul Eggert (a change to current DST rules in Uruguay and
3316 an update to a link to time zone software)
3319 Release 2005f - 2005-03-01 08:45:32 -0500
3321 data and documentation changes by Paul Eggert
3324 Release 2005e - 2005-02-10 15:59:44 -0500
3329 Release code2005d - 2005-01-31 09:21:47 -0500
3331 make zic complain about links to links if the -v flag is used
3333 have "make public" do more code checking
3335 add an include to "localtime.c" for the benefit of gcc systems
3338 Release 2005c - 2005-01-17 18:36:29 -0500
3340 get better results when mktime runs on a system where time_t is double
3342 changes to the data files (most importantly to Paraguay)
3345 Release 2005b - 2005-01-10 09:19:54 -0500
3347 Get localtime and gmtime working on systems with exotic time_t types.
3349 Update the leap second commentary in the "leapseconds" file.
3352 Release 2005a - 2005-01-01 13:13:44 -0500
3357 Release code2004i - 2004-12-14 13:42:58 -0500
3359 Deal with systems where time_t is unsigned.
3362 Release code2004h - 2004-12-07 11:40:18 -0500
3364 64-bit-time_t changes
3367 Release 2004g - 2004-11-02 09:06:01 -0500
3369 update to Cuba (taking effect this weekend)
3371 other changes by Paul Eggert
3373 correction of the spelling of Oslo
3375 changed versions of difftime.c and private.h
3378 Release code2004f - 2004-10-21 10:25:22 -0400
3380 Cope with wide-ranging tm_year values.
3383 Release 2004e - 2004-10-11 14:47:21 -0400
3385 Brazil/Argentina/Israel changes by Paul Eggert
3387 changes to tz-link.htm by Paul
3389 one small fix to Makefile
3392 Release 2004d - 2004-09-22 08:27:29 -0400
3394 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3397 Release 2004c - 2004-08-11 12:06:26 -0400
3399 asctime-related changes
3401 (variants of) some of the documentation changes suggested by Paul Eggert
3404 Release 2004b - 2004-07-19 14:33:35 -0400
3406 data changes by Paul Eggert - most importantly, updates for Argentina
3409 Release 2004a - 2004-05-27 12:00:47 -0400
3411 changes by Paul Eggert
3413 Handle DST transitions that occur at the end of a month in some
3414 years but at the start of the following month in other years.
3416 Add a copy of the correspondence that's the basis for claims about
3417 DST in the Navajo Nation.
3420 Release 2003e - 2003-12-15 09:36:47 -0500
3422 changes by Arthur David Olson (primarily code changes)
3424 changes by Paul Eggert (primarily data changes)
3426 minor changes to "Makefile" and "northamerica" (in the latter case,
3427 optimization of the "Toronto" rules)
3430 Release 2003d - 2003-10-06 09:34:44 -0400
3432 changes by Paul Eggert
3435 Release 2003c - 2003-09-16 10:47:05 -0400
3437 Fix bad returns in zic.c's inleap function.
3438 Thanks to Bradley White for catching the problem!
3441 Release 2003b - 2003-09-16 07:13:44 -0400
3443 Add a "--version" option (and documentation) to the zic and zdump commands.
3445 changes to overflow/underflow checking in zic
3447 a localtime typo fix.
3449 Update the leapseconds and tz-art.htm files.
3452 Release 2003a - 2003-03-24 09:30:54 -0500
3454 changes by Paul Eggert
3456 a few additions and modifications to the tz-art.htm file
3459 Release 2002d - 2002-10-15 13:12:42 -0400
3461 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3463 There's also a new time zone quote in "tz-art.htm".
3466 Release 2002c - 2002-04-04 11:55:20 -0500
3468 changes by Paul Eggert
3470 Change zic.c to avoid creating symlinks to files that don't exist.
3473 Release 2002b - 2002-01-28 12:56:03 -0500
3475 [These change notes are for Release 2002a, which was corrupted.
3476 2002b was a corrected version of 2002a.]
3478 changes by Paul Eggert
3480 Update the "leapseconds" file to note that there'll be no leap
3481 second at the end of June, 2002.
3483 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3485 Change to "difftime.c" to avoid sizeof problems.
3488 Release 2001d - 2001-10-09 13:31:32 -0400
3490 changes by Paul Eggert
3493 Release 2001c - 2001-06-05 13:59:55 -0400
3495 changes by Paul Eggert and Andrew Brown
3498 Release 2001b - 2001-04-05 16:44:38 -0400
3500 changes by Paul Eggert (modulo jnorgard's typo fix)
3502 tz-art.htm has been HTMLified.
3505 Release 2001a - 2001-03-13 12:57:44 -0500
3507 changes by Paul Eggert
3509 An addition to the "leapseconds" file: comments with the text of the
3510 latest IERS leap second notice.
3512 Trailing white space has been removed from data file lines, and
3513 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3517 Release 2000h - 2000-12-14 15:33:38 -0500
3519 changes by Paul Eggert
3521 one typo fix in the "art" file
3523 With providence, this is the last update of the millennium.
3526 Release 2000g - 2000-10-10 11:35:22 -0400
3528 changes by Paul Eggert
3530 correction of John Mackin's name submitted by Robert Elz
3532 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3533 Emmy Awards broadcast.
3536 Release 2000f - 2000-08-10 09:31:58 -0400
3538 changes by Paul Eggert
3540 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3542 Error checking and messages in the "yearistype" script have been
3546 Release 2000e - 2000-07-31 09:27:54 -0400
3548 data changes by Paul Eggert
3550 a change to the default value of the defined constant HAVE_STRERROR
3552 the addition of a Dave Barry quote on DST to the tz-arts file
3555 Release 2000d - 2000-04-20 15:43:04 -0400
3557 changes to the documentation and code of strftime for C99 conformance
3559 a bug fix for date.c
3561 These are based on (though modified from) changes by Paul Eggert.
3564 Release 2000c - 2000-03-04 10:31:43 -0500
3566 changes by Paul Eggert
3569 Release 2000b - 2000-02-21 12:16:29 -0500
3571 changes by Paul Eggert and Joseph Myers
3573 modest tweaks to the tz-art.htm and tz-link.htm files
3576 Release 2000a - 2000-01-18 09:21:26 -0500
3578 changes by Paul Eggert
3580 The two hypertext documents have also been renamed.
3583 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3585 Paul Eggert's changes
3587 additions to the "zic" manual page and the "Arts.htm" file
3590 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3595 Release data1999h - 1999-10-07 03:50:29 -0400
3597 changes by Paul Eggert to "europe" (most importantly, fixing
3598 Lithuania and Estonia)
3601 Release 1999g - 1999-09-28 11:06:18 -0400
3603 data changes by Paul Eggert (most importantly, the change for
3604 Lebanon that buys correctness for this coming Sunday)
3606 The "code" file contains changes to "Makefile" and "checktab.awk" to
3607 allow better checking of time zone files before they are published.
3610 Release 1999f - 1999-09-23 09:48:14 -0400
3612 changes by Arthur David Olson and Paul Eggert
3615 Release 1999e - 1999-08-17 15:20:54 -0400
3617 changes circulated by Paul Eggert, although the change to handling
3618 of DST-specifying time zone names has been commented out for now
3619 (search for "XXX" in "localtime.c" for details). These files also
3620 do not make any changes to the start of DST in Brazil.
3622 In addition to Paul's changes, there are updates to "Arts.htm" and
3626 Release 1999d - 1999-03-30 11:31:07 -0500
3628 changes by Paul Eggert
3630 The Makefile's "make public" rule has also been changed to do a test
3631 compile of each individual time zone data file (which should help
3632 avoid problems such as the one we had with Nicosia).
3635 Release 1999c - 1999-03-25 09:47:47 -0500
3637 changes by Paul Eggert, most importantly the change for Chile.
3640 Release 1999b - 1999-02-01 17:51:44 -0500
3642 changes by Paul Eggert
3644 code changes (suggested by Mani Varadarajan, mani at be.com) for
3645 correct handling of symbolic links when building using a relative directory
3647 code changes to generate correct messages for failed links
3649 updates to the URLs in Arts.htm
3652 Release 1999a - 1999-01-19 16:20:29 -0500
3654 error message internationalizations and corrections in zic.c and
3655 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3659 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3661 changes for Brazil, Chile, and Germany
3663 support for use of "24:00" in the input files for the time zone compiler
3666 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3668 changes by Paul Eggert
3670 correction to a define in the "private.h" file
3673 Release data1998g - 1998-08-11 03:28:35 -0000
3674 [tzdata1998g.tar.gz is missing!]
3676 Lithuanian change provided by mgedmin at pub.osf.it
3678 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3679 "backward") to ensure that the GMT file is created even where folks
3680 don't want the "backward" links (as suggested by Paul Eggert).
3683 Release data1998f - 1998-07-20 13:50:00 -0000
3684 [tzdata1998f.tar.gz is missing!]
3686 Update the "leapseconds" file to include the newly-announced
3687 insertion at the end of 1998.
3690 Release code1998f - 1998-06-01 10:18:31 -0400
3692 addition to localtime.c by Guy Harris
3695 Release 1998e - 1998-05-28 09:56:26 -0400
3697 The Makefile is changed to produce zoneinfo-posix rather than
3698 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3701 data changes by Paul Eggert
3703 changes from Guy Harris to provide asctime_r and ctime_r
3705 A usno1998 file (substantially identical to usno1997) has been added.
3708 Release 1998d - 1998-05-14 11:58:34 -0400
3710 changes to comments (in particular, elimination of references to CIA maps).
3711 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3712 where changes occur.
3715 Release 1998c - 1998-02-28 12:32:26 -0500
3717 changes by Paul Eggert (save the "French correction," on which I'll
3718 wait for the dust to settle)
3722 changes and additions to Arts.htm
3725 Release 1998b - 1998-01-17 14:31:51 -0500
3727 URL cleanups and additions
3730 Release 1998a - 1998-01-13 12:37:35 -0500
3732 changes by Paul Eggert
3735 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3737 changes by Paul Eggert, with minor modifications from Arthur David
3738 Olson to make the files more browser friendly
3741 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3743 minor changes to put "TZif" at the start of each time zone information file
3745 a rule has also been added to the Makefile so you can
3747 to just recompile the zone information files (rather than doing a
3748 full "make install" with its other effects).
3751 Release data1997i - 1997-10-07 08:45:38 -0400
3753 changes to Africa by Paul Eggert
3756 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3758 corrections for Uruguay (and other locations)
3760 Arthur David Olson's simple-minded fix allowing mktime to both
3761 correctly handle leap seconds and correctly handle tm_sec values
3762 upon which arithmetic has been performed.
3765 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3767 Paul Eggert's updates
3769 a small change to a function prototype;
3771 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3772 include information on Around the World in Eighty Days.
3775 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3777 fixes to zic's error handling
3779 changes inspired by the item circulated on Slovenia
3781 The description of Web resources has been HTMLified for browsing
3784 A new piece of tz-related music has been added to the "Music" file.
3787 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3789 Paul Eggert's latest suggestions
3792 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3794 changes to "zic.c" to correct performance of the "-s" option
3796 a new file "usno1997"
3799 Release data1997c - 1997-03-04 09:58:18 -0500
3804 Release 1997b - 1997-02-27 18:34:19 -0500
3806 The data file incorporates the 1997 leap second.
3808 The code file incorporates Arthur David Olson's take on the
3809 zic/multiprocessor/directory-creation situation.
3812 Release 1997a - 1997-01-21 09:11:10 -0500
3814 Paul Eggert's Antarctica (and other changes)
3816 Arthur David Olson finessed the "getopt" issue by checking against
3817 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3818 is returned while SunOS 5.5's manual says EOF is returned).
3821 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3823 Paul Eggert's latest changes
3826 Release code1996n - 1996-12-16 09:42:02 -0500
3828 link snapping fix from Bruce Evans (via Garrett Wollman)
3831 Release data1996m - 1996-11-24 02:37:34 -0000
3832 [tzdata1996m.tar.gz is missing!]
3834 Paul Eggert's batch of changes
3837 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3839 No functional changes here; the files have simply been changed to
3840 make more use of ISO style dates in comments. The names of the above
3841 files now include the year in full.
3844 Release code96l - 1996-09-08 17:12:20 -0400
3846 tzcode96k was missing a couple of pieces.
3849 Release 96k - 1996-09-08 16:06:22 -0400
3851 the latest round of changes from Paul Eggert
3853 the recent Year 2000 material
3856 Release code96j - 1996-07-30 13:18:53 -0400
3858 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3861 Release code96i - 1996-07-27 20:11:35 -0400
3863 Paul's suggested patch for strftime %V week numbers
3866 Release data96i - 1996-07-01 18:13:04 -0400
3868 "northamerica" and "europe" changes by Paul Eggert
3871 Release code96h - 1996-06-05 08:02:21 -0400
3873 fix for handling transitions specified in Universal Time
3875 Some "public domain" notices have also been added.
3878 Release code96g - 1996-05-16 14:00:26 -0400
3880 fix for the simultaneous-DST-and-zone-change challenge
3883 Release data96h - 1996-05-09 17:40:51 -0400
3885 changes by Paul Eggert
3888 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3889 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3891 The changes get us some of the way to fixing the problems noted in Paul
3892 Eggert's letter yesterday (in addition to a few others). The approach
3893 has been to make zic a bit smarter about figuring out what time zone
3894 abbreviations apply just after the time specified in the "UNTIL" part
3895 of a zone line. Putting the smarts in zic means avoiding having
3896 transition times show up in both "Zone" lines and "Rule" lines, which
3897 in turn avoids multiple transition time entries in time zone files.
3898 (This also makes the zic input files such as "europe" a bit shorter and
3899 should ease maintenance.)
3902 Release data96f - 1996-04-19 19:20:03 -0000
3903 [tzdata96f.tar.gz is missing!]
3905 The only changes are to the "northamerica" file; the time zone
3906 abbreviation for Denver is corrected to MST (and MDT), and the
3907 comments for Mexico have been updated.
3910 Release data96e - 1996-03-19 17:37:26 -0500
3912 Proposals by Paul Eggert, in particular the Portugal change that
3913 comes into play at the end of this month.
3916 Release data96d - 1996-03-18 20:49:39 -0500
3921 Release code96e - 1996-02-29 15:43:27 -0000
3922 [tzcode96e.tar.gz is missing!]
3924 internationalization changes and the fix to the documentation for strftime
3927 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3929 The "code" file simply updates Bob Kridle's electronic address.
3931 The "data" file updates rules for Mexico.
3934 Release data96b - 1996-01-27 15:44:42 -0500
3939 Release code96c - 1996-01-16 16:58:15 -0500
3941 leap-year streamlining and binary-search changes
3946 Release code96b - 1996-01-10 20:42:39 -0500
3948 fixes and enhancements from Paul Eggert, including code that
3949 emulates the behavior of recent versions of the SunOS "date"
3953 Release 96a - 1996-01-06 09:08:24 -0500
3957 fixes to strftime.c for correct ISO 8601 week number generation,
3958 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3959 numbers (which are not necessarily the same as calendar year numbers)
3962 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3964 The latest revisions from Paul Eggert are included, the usno1995
3965 file has been updated, and a new file ("WWW") covering useful URLs
3969 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3971 A simplification of a macro definition, a change to data for Sudan,
3972 and (for last minute shoppers) notes in the "Music" file on the CD
3976 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3978 (slightly reformatted) 8-bit-clean proposed patch
3980 minor patch: US/Eastern -> America/New_York
3982 snapshot of the USNO's latest data ("usno1995")
3984 some other minor cleanups
3987 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3988 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3992 support for 64-bit time_t's
3994 optimization in localtime.c
3997 Release code95e - 1995-10-13 13:23:57 -0400
3999 the mktime change to scan from future to past when trying to find time zone
4003 Release data95i - 1995-09-26 10:43:26 -0400
4005 For Canada/Central, guess that the Sun customer's "one week too
4006 early" was just a approximation, and the true error is one month
4007 too early. This is consistent with the rest of Canada.
4010 Release data95h - 1995-09-21 11:26:48 -0400
4012 latest changes from Paul Eggert
4015 Release code95d - 1995-09-14 11:14:45 -0400
4017 the addition of a "Music" file, which documents four recorded
4018 versions of the tune "Save That Time".
4021 Release data95g - 1995-09-01 17:21:36 -0400
4023 "yearistype" correction
4026 Release data95f - 1995-08-28 20:46:56 -0400
4028 Paul Eggert's change to the australasia file
4031 Release data95e - 1995-07-08 18:02:34 -0400
4033 The only change is a leap second at the end of this year.
4034 Thanks to Bradley White for forwarding news on the leap second.
4037 Release data95d - 1995-07-03 13:26:22 -0400
4039 Paul Eggert's changes
4042 Release data95c - 1995-07-02 19:19:28 -0400
4044 changes to "asia", "backward", "europe", and "southamerica"
4045 (read: northamericacentrics need not apply)
4048 Release code95c - 1995-03-13 14:00:46 -0500
4050 one-line fix for sign extension problems in detzcode
4053 Release 95b - 1995-03-04 11:22:38 -0500
4055 Minor changes in both:
4057 The "code" file contains a workaround for the lack of "unistd.h" in
4058 Microsoft C++ version 7.
4060 The "data" file contains a fixed "Link" for America/Shiprock.
4063 Release 94h - 1994-12-10 12:51:14 -0500
4067 * incorporate the changes to "zdump" and "date" to make changes to
4068 the "TZ" environment variable permanent;
4070 * incorporate the table changes by Paul Eggert;
4072 * include (and document) support for universal time specifications in
4073 data files - but do not (yet) include use of this feature in the
4076 Think of this as "TZ Classic" - the software has been set up not to break if
4077 universal time shows up in its input, and data entries have been
4078 left as is so as not to break existing implementations.
4081 Release data94f - 1994-08-20 12:56:09 -0400
4083 (with thanks!) the latest data updates from Paul Eggert
4086 Release data94e - 1994-06-04 13:13:53 -0400
4091 Release code94g - 1994-05-05 12:14:07 -0400
4093 fix missing "optind.c" and a reference to it in the Makefile
4096 Release code94f - 1994-05-05 13:00:33 -0000
4097 [tzcode94f.tar.gz is missing!]
4099 changes to avoid overflow in difftime, as well as changes to cope
4100 with the 52/53 challenge in strftime
4103 Release code94e - 1994-03-30 23:32:59 -0500
4105 change for the benefit of PCTS
4108 Release 94d - 1994-02-24 15:42:25 -0500
4110 Avoid clashes with POSIX semantics for zones such as GMT+4.
4112 Some other very minor housekeeping is also present.
4115 Release code94c - 1994-02-10 08:52:40 -0500
4117 Fix bug where mkdirs was broken unless you compile with
4118 -fwritable-strings (which is generally losing to do).
4121 Release 94b - 1994-02-07 10:04:33 -0500
4123 work by Paul Eggert who notes:
4125 I found another book of time zone histories by E W Whitman; it's not
4126 as extensive as Shanks but has a few goodies of its own. I used it
4127 to update the tables. I also fixed some more as a result of
4128 correspondence with Adam David and Peter Ilieve, and move some stray
4129 links from 'europe' to 'backward'. I corrected some scanning errors
4132 As far as the code goes, I fixed zic to allow years in the range
4133 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4134 And I cleaned up the zic documentation a little bit.
4137 Release data94a - 1994-02-03 08:58:54 -0500
4139 It simply incorporates the recently announced leap second into the
4143 Release 93g - 1993-11-22 17:28:27 -0500
4145 Paul Eggert has provided a good deal of historic information (based
4146 on Shanks), and there are some code changes to deal with the buglets
4147 that crawled out in dealing with the new information.
4150 Release 93f - 1993-10-15 12:27:46 -0400
4152 Paul Eggert's changes
4155 Release 93e - 1993-09-05 21:21:44 -0400
4157 This has updated data for Israel, England, and Kwajalein. There's
4158 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4159 Thanks to Paul Eggert and Peter Ilieve for the changes.
4162 Release 93d - 1993-06-17 23:34:17 -0400
4164 new fix and new data on Israel
4167 Release 93c - 1993-06-06 19:31:55 -0400
4172 Release 93b - 1993-02-02 14:53:58 -0500
4174 updated "leapseconds" file
4177 Release 93 - 1993-01-08 07:01:06 -0500
4179 At kre's suggestion, the package has been split in two - a code piece
4180 (which also includes documentation) that's only of use to folks who
4181 want to recompile things and a data piece useful to anyone who can
4184 The new version has a few changes to the data files, a few
4185 portability changes, and an off-by-one fix (with thanks to
4186 Tom Karzes at deshaw.com for providing a description and a
4190 Release 92c - 1992-11-21 17:35:36 -0000
4191 [tz92c.tar.Z is missing!]
4193 The fallout from the latest round of DST transitions.
4195 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4196 there's also a change to "zic.c" that makes it portable to more systems.
4199 Release 92 - 1992-04-25 18:17:03 -0000
4200 [tz92.tar.Z is missing!]
4202 By popular demand (well, at any rate, following a request by kre at munnari)
4205 The 1989 update of the time zone package featured:
4207 * POSIXization (including interpretation of POSIX-style TZ environment
4208 variables, provided by Guy Harris),
4209 * ANSIfication (including versions of "mktime" and "difftime"),
4210 * SVIDulation (an "altzone" variable)
4211 * MACHination (the "gtime" function)
4212 * corrections to some time zone data (including corrections to the rules
4213 for Great Britain and New Zealand)
4214 * reference data from the United States Naval Observatory for folks who
4215 want to do additional time zones
4216 * and the 1989 data for Saudi Arabia.
4218 (Since this code will be treated as "part of the implementation" in some
4219 places and as "part of the application" in others, there's no good way to
4220 name functions, such as timegm, that are not part of the proposed ANSI C
4221 standard; such functions have kept their old, underscore-free names in this
4224 And the "dysize" function has disappeared; it was present to allow
4225 compilation of the "date" command on old BSD systems, and a version of "date"
4226 is now provided in the package. The "date" command is not created when you
4227 "make all" since it may lack options provided by the version distributed with
4228 your operating system, or may not interact with the system in the same way
4229 the native version does.
4231 Since POSIX frowns on correct leap second handling, the default behavior of
4232 the "zic" command (in the absence of a "-L" option) has been changed to omit
4233 leap second information from its output files.
4239 This file contains copies of the part of each release announcement
4240 that talks about the changes in that release. The text has been
4241 adapted and reformatted for the purposes of this file.
4243 Traditionally a release R consists of a pair of tarball files,
4244 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4245 code2010a, data2012c) consist of just one or the other tarball, and a
4246 few (e.g., code2012c-data2012d) have tarballs with mixed version
4247 numbers. Recent releases also come in an experimental format
4248 consisting of a single tarball tzdb-R.tar.lz with extra data.
4250 Release timestamps are taken from the release's commit (for newer,
4251 Git-based releases), from the newest file in the tarball (for older
4252 releases, where this info is available) or from the email announcing
4253 the release (if all else fails; these are marked with a time zone of
4254 -0000 and an "is missing!" comment).
4256 Earlier versions of the code and data were not announced on the tz
4257 list and are not summarized here.
4259 This file is in the public domain.