1 News for the tz database
3 Release 2018a - 2018-01-12 22:29:21 -0800
6 São Tomé and Príncipe switched from +00 to +01.
7 Brazil's DST will now start on November's first Sunday.
8 Ireland's standard time is now in the summer, not the winter.
9 Use Debian-style installation locations, instead of 4.3BSD-style.
12 Changes to past and future time stamps
14 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
15 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
17 Changes to future time stamps
19 Starting in 2018 southern Brazil will begin DST on November's
20 first Sunday instead of October's third Sunday. (Thanks to
23 Changes to past time stamps
25 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
26 been corrected. The 'backzone' and 'zone.tab' files did not agree
27 with the 'africa' and 'zone1970.tab' files. (Problem reported by
30 The abbreviation invented for Bolivia Summer Time (1931-2) is now
31 BST instead of BOST, to be more consistent with the convention
32 used for Latvian Summer Time (1918-9) and for British Summer Time.
36 Change Europe/Dublin so that it observes Irish Standard Time (UT
37 +01) in summer and GMT (as negative daylight-saving) in winter,
38 instead of observing standard time (GMT) in winter and Irish
39 Summer Time (UT +01) in summer. This change does not affect UT
40 offsets or abbreviations; it affects only whether timestamps are
41 considered to be standard time or daylight-saving time, as
42 expressed in the tm_isdst flag of C's struct tm type.
43 (Discrepancy noted by Derick Rethans.)
45 Changes to build procedure
47 The default installation locations have been changed to mostly
48 match Debian circa 2017, instead of being designed as an add-on to
49 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
50 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
51 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
52 locations more precisely. (This responds to suggestions from
53 Brian Inglis and from Steve Summit.)
55 The default installation procedure no longer creates the
56 backward-compatibility link US/Pacific-New, which causes
57 confusion during user setup (e.g., see Debian bug 815200).
58 Use 'make BACKWARD="backward pacificnew"' to create the link
59 anyway, for now. Eventually we plan to remove the link entirely.
61 tzdata.zi now contains a version-number comment.
62 (Suggested by Tom Lane.)
64 The Makefile now quotes values like BACKWARD more carefully when
65 passing them to the shell. (Problem reported by Zefram.)
67 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
68 that have snprintf and use pre-C99 compilers. (Problem reported
73 zic has a new option -t FILE that specifies the location of the
74 file that determines local time when TZ is unset. The default for
75 this location can be configured via the new TZDEFAULT makefile
76 macro, which defaults to /etc/localtime.
78 Diagnostics and commentary now distinguish UT from UTC more
79 carefully; see theory.html for more information about UT vs UTC.
81 zic has been ported to GCC 8's -Wstringop-truncation option.
82 (Problem reported by Martin Sebor.)
84 Changes to documentation and commentary
86 The zic man page now documents the longstanding behavior that
87 times and years can be out of the usual range, with negative times
88 counting backwards from midnight and with year 0 preceding year 1.
89 (Problem reported by Michael Deckers.)
91 The theory.html file now mentions the POSIX limit of six chars
92 per abbreviation, and lists alphabetic abbreviations used.
94 The files tz-art.htm and tz-link.htm have been renamed to
95 tz-art.html and tz-link.html, respectively, for consistency with
96 other file names and to simplify web server configuration.
99 Release 2017c - 2017-10-20 14:49:34 -0700
102 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
103 Fiji ends DST 2018-01-14, not 2018-01-21.
104 Namibia switches from +01/+02 to +02 on 2018-04-01.
105 Sudan switches from +03 to +02 on 2017-11-01.
106 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
107 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
108 A new file tzdata.zi now holds a small text copy of all data.
109 The zic input format has been regularized slightly.
111 Changes to future time stamps
113 Northern Cyprus has decided to resume EU rules starting
114 2017-10-29, thus reinstituting winter time.
116 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
117 predicted. (Thanks to Dominic Fok.) Adjust future predictions
120 Namibia will switch from +01 with DST to +02 all year on
121 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
122 at 02:00. (Thanks to Steffen Thorsen.)
124 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
125 Atyya and Yahia Abdalla.) South Sudan is not switching, so
126 Africa/Juba is no longer a link to Africa/Khartoum.
128 Tonga has likely ended its experiment with DST, and will not
129 adjust its clocks on 2017-11-05. Although Tonga has not announced
130 whether it will continue to observe DST, the IATA is assuming that
131 it will not. (Thanks to David Wade.)
133 Turks & Caicos will switch from -04 all year to -05 with US DST on
134 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
135 at 02:00. (Thanks to Steffen Thorsen.)
137 Changes to past time stamps
139 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
140 (Thanks to Arthur David Olson.)
142 Detroit did not observe DST in 1967.
144 Use railway time for Asia/Kolkata before 1941, by switching to
145 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
146 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
148 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
149 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
151 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
152 American time in 1892, not 1879. (Thanks to Michael Deckers.)
154 Adjust the 1867 transition in Alaska to better reflect the
155 historical record, by changing it to occur on 1867-10-18 at 15:30
156 Sitka time rather than at the start of 1867-10-17 local time.
157 Although strictly speaking this is accurate only for Sitka,
158 the rest of Alaska's blanks need to be filled in somehow.
160 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
161 (Thanks to Michael Deckers.)
163 Add 7 s to the UT offset in Asia/Yangon before 1920.
165 Changes to zone names
167 Remove Canada/East-Saskatchewan from the 'backward' file, as it
168 exceeded the 14-character limit and was an unused misnomer anyway.
170 Changes to build procedure
172 To support applications that prefer to read time zone data in text
173 form, two zic input files tzdata.zi and leapseconds are now
174 installed by default. The commands 'zic tzdata.zi' and 'zic -L
175 leapseconds tzdata.zi' can reproduce the tzdata binary files
176 without and with leap seconds, respectively. To prevent these two
177 new files from being installed, use 'make TZDATA_TEXT=', and to
178 suppress leap seconds from the tzdata text installation, use 'make
179 TZDATA_TEXT=tzdata.zi'.
181 'make BACKWARD=' now suppresses backward-compatibility names
182 like 'US/Pacific' that are defined in the 'backward' and
185 'make check' now works on systems that lack a UTF-8 locale,
186 or that lack the nsgmls program. Set UTF8_LOCALE to configure
187 the name of a UTF-8 locale, if you have one.
189 Y2K runtime checks are no longer enabled by default. Add
190 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
191 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
192 to disable them. (New name suggested by Brian Inglis.)
194 The build procedure for zdump now works on AIX 7.1.
195 (Problem reported by Kees Dekker.)
199 zic and the reference runtime now reject multiple leap seconds
200 within 28 days of each other, or leap seconds before the Epoch.
201 As a result, support for double leap seconds, which was
202 obsolescent and undocumented, has been removed. Double leap
203 seconds were an error in the C89 standard; they have never existed
204 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
205 noticing glitches in the code that uncovered this problem.)
207 zic now warns about use of the obsolescent and undocumented -y
208 option, and about use of the obsolescent TYPE field of Rule lines.
210 zic now allows unambiguous abbreviations like "Sa" and "Su" for
211 weekdays; formerly it rejected them due to a bug. Conversely, zic
212 no longer considers non-prefixes to be abbreviations; for example,
213 it no longer accepts "lF" as an abbreviation for "lastFriday".
214 Also, zic warns about the undocumented usage with a "last-"
215 prefix, e.g., "last-Fri".
217 Similarly, zic now accepts the unambiguous abbreviation "L" for
218 "Link" in ordinary context and for "Leap" in leap-second context.
219 Conversely, zic no longer accepts non-prefixes such as "La" as
220 abbreviations for words like "Leap".
222 zic no longer accepts leap second lines in ordinary input, or
223 ordinary lines in leap second input. Formerly, zic sometimes
224 warned about this undocumented usage and handled it incorrectly.
226 The new macro HAVE_TZNAME governs whether the tzname external
227 variable is exported, instead of USG_COMPAT. USG_COMPAT now
228 governs only the external variables "timezone" and "daylight".
229 This change is needed because the three variables are not in the
230 same category: although POSIX requires tzname, it specifies the
231 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
232 if not defined, the code attempts to guess it from other macros.
234 localtime.c and difftime.c no longer require stdio.h, and .c files
235 other than zic.c no longer require sys/wait.h.
237 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
239 Calculation of time_t extrema works around a bug in GCC 4.8.4
240 (Reported by Stan Shebs and Joseph Myers.)
242 zic.c no longer mistranslates formats of line numbers in non-English
243 locales. (Problem reported by Benno Schulenberg.)
245 Several minor changes have been made to the code to make it a
246 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
247 Dekker for reporting the problems.)
249 Changes to documentation and commentary
251 The two new files 'theory.html' and 'calendars' contain the
252 contents of the removed file 'Theory'. The goal is to document
253 tzdb theory more accessibly.
255 The zic man page now documents abbreviation rules.
257 tz-link.htm now covers how to apply tzdata changes to clients.
258 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
260 The leap-seconds.list URL has been updated to something that is
261 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
263 Release 2017b - 2017-03-17 07:30:38 -0700
265 Briefly: Haiti has resumed DST.
267 Changes to past and future time stamps
269 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
271 Changes to past time stamps
273 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
275 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
276 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
280 The reference localtime implementation now falls back on the
281 current US daylight-saving transition rules rather than the
282 1987-2006 rules. This fallback occurs only when (1) the TZ
283 environment variable's value has a name like "AST4ADT" that asks
284 for daylight saving time but does not specify the rules, (2) there
285 is no file by that name, and (3) the TZDEFRULES file cannot be
286 loaded. (Thanks to Tom Lane.)
289 Release 2017a - 2017-02-28 00:05:36 -0800
291 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
294 Changes to future time stamps
296 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
298 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
299 Its clocks diverge from America/Santiago starting 2017-05-13 at
300 23:00, hiving off a new zone America/Punta_Arenas. Although the
301 Chilean government says this change expires in May 2019, for now
302 assume it's permanent. (Thanks to Juan Correa and Deborah
303 Goldsmith.) This also affects Antarctica/Palmer.
305 Changes to past time stamps
307 Fix many entries for historical time stamps for Europe/Madrid
308 before 1979, to agree with tables compiled by Pere Planesas of the
309 National Astronomical Observatory of Spain. As a side effect,
310 this changes some time stamps for Africa/Ceuta before 1929, which
311 are probably guesswork anyway. (Thanks to Steve Allen and
312 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
313 correcting the 1901 transition.)
315 Ecuador observed DST from 1992-11-28 to 1993-02-05.
316 (Thanks to Alois Treindl.)
318 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
319 (Thanks to Stepan Golosunov.)
321 Changes to past and future time zone abbreviations
323 Switch to numeric time zone abbreviations for South America, as
324 part of the ongoing project of removing invented abbreviations.
325 This avoids the need to invent an abbreviation for the new Chilean
326 new zone. Similarly, switch from invented to numeric time zone
327 abbreviations for Afghanistan, American Samoa, the Azores,
328 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
329 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
330 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
331 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
332 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
333 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
334 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
335 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
336 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
337 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
338 for half-hour daylight saving time in Belize before 1944 and in
339 the Dominican Republic before 1975; and for Canary Islands before
340 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
341 Indian Summer Time before 1942, for Indonesia before around 1964,
342 for Kenya before 1960, for Liberia before 1973, for Madeira before
343 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
344 Pakistan before 1971, for Western Sahara before 1977, and for
345 Zaporozhye in 1880-1924.
347 For Alaska time from 1900 through 1967, instead of "CAT" use the
348 abbreviation "AST", the abbreviation commonly used at the time
349 (Atlantic Standard Time had not been standardized yet). Use "AWT"
350 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
352 Use "CST" and "CDT" instead of invented abbreviations for Macau
353 before 1999 and Taiwan before 1938, and use "JST" instead of the
354 invented abbreviation "JCST" for Japan and Korea before 1938.
356 Change to database entry category
358 Move the Pacific/Johnston link from 'australasia' to 'backward',
359 since Johnston is now uninhabited.
363 zic no longer mishandles some transitions in January 2038 when it
364 attempts to work around Qt bug 53071. This fixes a bug affecting
365 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
366 now contains a workaround, useful when loading a file generated by
367 a buggy zic. (Problem and localtime.c fix reported by Bradley
370 zdump -i now outputs non-hour numeric time zone abbreviations
371 without a colon, e.g., "+0530" rather than "+05:30". This agrees
372 with zic %z and with common practice, and simplifies auditing of
375 zdump is now buildable again with -DUSE_LTZ=0.
376 (Problem reported by Joseph Myers.)
378 zdump.c now always includes private.h, to avoid code duplication
379 with private.h. (Problem reported by Kees Dekker.)
381 localtime.c no longer mishandles early or late timestamps
382 when TZ is set to a POSIX-style string that specifies DST.
383 (Problem reported by Kees Dekker.)
385 date and strftime now cause %z to generate "-0000" instead of
386 "+0000" when the UT offset is zero and the time zone abbreviation
389 Changes to documentation and commentary
391 The 'Theory' file now better documents choice of historical time
392 zone abbreviations. (Problems reported by Michael Deckers.)
394 tz-link.htm now covers leap smearing, which is popular in clouds.
397 Release 2016j - 2016-11-22 23:17:13 -0800
399 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
401 Changes to future time stamps
403 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
404 This hives off a new zone Europe/Saratov from Europe/Volgograd.
405 (Thanks to Yuri Konotopov and Stepan Golosunov.)
407 Changes to past time stamps
409 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
410 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
411 1999, not fall 1994. (Thanks to Stepan Golosunov.)
413 Changes to past time zone abbreviations
415 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
416 summer time before 1948. The old use of "EET" was a typo.
420 zic no longer mishandles file systems that lack hard links, fixing
421 bugs introduced in 2016g. (Problems reported by Tom Lane.)
422 Also, when the destination already contains symbolic links, zic
423 should now work better on systems where the 'link' system call
424 does not follow symbolic links.
426 Changes to documentation and commentary
428 tz-link.htm now documents the relationship between release version
429 numbers and development-repository commit tags. (Suggested by
432 The 'Theory' file now documents UT.
434 iso3166.tab now accents "Curaçao", and commentary now mentions
435 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
438 Release 2016i - 2016-11-01 23:19:52 -0700
440 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
441 reintroduces DST on 2016-11-06.
443 Changes to future time stamps
445 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
446 2017-01-15 at 03:00. Assume future observances in Tonga will be
447 from the first Sunday in November through the third Sunday in
448 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
449 time zone abbreviations for this zone.
451 Changes to past and future time stamps
453 Northern Cyprus is now +03 year round, causing a split in Cyprus
454 time zones starting 2016-10-30 at 04:00. This creates a zone
455 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
457 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
458 (Thanks to Steffen Thorsen.)
460 Changes to past time stamps
462 Several corrections were made for pre-1975 time stamps in Italy.
463 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
466 First, the 1893-11-01 00:00 transition in Italy used the new UT
467 offset (+01), not the old (+00:49:56). (Thanks to Michael
470 Second, rules for daylight saving in Italy were changed to agree
471 with Italy's National Institute of Metrological Research (INRiM)
472 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
473 Inglis, and Michael Deckers):
475 The 1916-06-03 transition was at 24:00, not 00:00.
477 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
480 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
483 The 1944-09-17 transition was at 03:00, not 01:00. This
484 particular change is taken from Italian law as INRiM's table,
485 (which says 02:00) appears to have a typo here. Also, keep the
486 1944-04-03 transition for Europe/Rome, as Rome was controlled by
489 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
494 The code should now be buildable on AmigaOS merely by setting the
495 appropriate Makefile variables. (From a patch by Carsten Larsen.)
498 Release 2016h - 2016-10-19 23:17:57 -0700
500 Changes to future time stamps
502 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
503 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
504 future fall transitions will be on the last Saturday of October
505 at 01:00, which is consistent with predicted spring transitions
506 on the last Saturday of March. (Thanks to Tim Parenti.)
508 Changes to past time stamps
510 In Turkey, transitions in 1986-1990 were at 01:00 standard time
511 not at 02:00, and the spring 1994 transition was on March 20, not
512 March 27. (Thanks to Kıvanç Yazan.)
514 Changes to past and future time zone abbreviations
516 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
517 instead of alphabetic ones like "IST" and "LKT". Various
518 English-language sources use "IST", "LKT" and "SLST", with no
519 working consensus. (Usage of "SLST" mentioned by Sadika
524 zic no longer mishandles relativizing file names when creating
525 symbolic links like /etc/localtime, when these symbolic links
526 are outside the usual directory hierarchy. This fixes a bug
527 introduced in 2016g. (Problem reported by Andreas Stieger.)
529 Changes to build procedure
531 New rules 'traditional_tarballs' and 'traditional_signatures' for
532 building just the traditional-format distribution. (Requested by
535 The file 'version' is now put into the tzdata tarball too.
536 (Requested by Howard Hinnant.)
538 Changes to documentation and commentary
540 The 'Theory' file now has a section on interface stability.
541 (Requested by Paul Koning.) It also mentions features like
542 tm_zone and localtime_rz that have long been supported by the
545 tz-link.htm has improved coverage of time zone boundaries suitable
546 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
549 The US commentary now mentions Allen and the "day of two noons".
551 The Fiji commentary mentions the government's 2016-10-03 press
552 release. (Thanks to Raymond Kumar.)
555 Release 2016g - 2016-09-13 08:56:38 -0700
557 Changes to future time stamps
559 Turkey switched from EET/EEST (+02/+03) to permanent +03,
560 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
561 than an invented abbreviation for the new time.
563 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
564 (Thanks to Tim Parenti.)
566 Changes to past time stamps
568 For America/Los_Angeles, spring-forward transition times have been
569 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
572 For zones using Soviet time on 1919-07-01, transitions to UT-based
573 time were at 00:00 UT, not at 02:00 local time. The affected
574 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
575 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
577 Changes to past and future time zone abbreviations
579 The Factory zone now uses the time zone abbreviation -00 instead
580 of a long English-language string, as -00 is now the normal way to
581 represent an undefined time zone.
583 Several zones in Antarctica and the former Soviet Union, along
584 with zones intended for ships at sea that cannot use POSIX TZ
585 strings, now use numeric time zone abbreviations instead of
586 invented or obsolete alphanumeric abbreviations. The affected
587 zones are Antarctica/Casey, Antarctica/Davis,
588 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
589 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
590 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
591 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
592 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
593 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
594 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
595 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
596 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
597 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
598 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
599 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
600 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
601 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
602 was replaced by +05, whereas MSK and MSD were kept as they are not
603 our invention and are widely used.
605 Changes to zone names
607 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
608 (Thanks to David Massoud.)
612 zic no longer generates binary files containing POSIX TZ-like
613 strings that disagree with the local time type after the last
614 explicit transition in the data. This fixes a bug with
615 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
616 stamps on the reference platform. (Thanks to Alexander Belopolsky
617 for reporting the bug and suggesting a way forward.)
619 If the installed localtime and/or posixrules files are symbolic
620 links, zic now keeps them symbolic links when updating them, for
621 compatibility with platforms like OpenSUSE where other programs
622 configure these files as symlinks.
624 zic now avoids hard linking to symbolic links, avoids some
625 unnecessary mkdir and stat system calls, and uses shorter file
628 zdump has a new -i option to generate transitions in a
629 more-compact but still human-readable format. This option is
630 experimental, and the output format may change in future versions.
631 (Thanks to Jon Skeet for suggesting that an option was needed,
632 and thanks to Tim Parenti and Chris Rovick for further comments.)
634 Changes to build procedure
636 An experimental distribution format is available, in addition
637 to the traditional format which will continue to be distributed.
638 The new format is a tarball tzdb-VERSION.tar.lz with signature
639 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
640 tzdb-VERSION containing the code and data of the traditional
641 two-tarball format, along with extra data that may be useful.
642 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
643 for comments about the experimental format.)
645 The release version number is now more accurate in the usual case
646 where releases are built from a Git repository. For example, if
647 23 commits and some working-file changes have been made since
648 release 2016g, the version number is now something like
649 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
650 Tagged releases use the same version number format as before,
651 e.g., '2016g'. To support the more-accurate version number, its
652 specification has moved from a line in the Makefile to a new
653 source file 'version'.
655 The experimental distribution contains a file to2050.tzs that
656 contains what should be the output of 'zdump -i -c 2050' on
657 primary zones. If this file is available, 'make check' now checks
658 that zdump generates this output.
660 'make check_web' now works on Fedora-like distributions.
662 Changes to documentation and commentary
664 tzfile.5 now documents the new restriction on POSIX TZ-like
665 strings that is now implemented by zic.
667 Comments now cite URLs for some 1917-1921 Russian DST decrees.
668 (Thanks to Alexander Belopolsky.)
670 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
671 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
672 description of Java 8 has been brought up to date (thanks to
673 Stephen Colebourne). Its description of local time on Mars has
674 been updated to match current practice, and URLs have been updated
675 and some obsolete ones removed.
678 Release 2016f - 2016-07-05 16:26:51 +0200
680 Changes affecting future time stamps
682 The Egyptian government changed its mind on short notice, and
683 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
684 (Thanks to Mina Samuel.)
686 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
687 (Thanks to Stepan Golosunov.)
689 Changes to past and future time stamps
691 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
692 abbreviations instead of invented ones.
694 Changes affecting past time stamps
696 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
697 (Thanks to Stepan Golosunov.)
700 Release 2016e - 2016-06-14 08:46:16 -0700
702 Changes affecting future time stamps
704 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
705 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
706 For future years, guess April's last Thursday to October's last
707 Thursday except for Ramadan.
709 Changes affecting past time stamps
711 Locations while uninhabited now use '-00', not 'zzz', as a
712 placeholder time zone abbreviation. This is inspired by Internet
713 RFC 3339 and is more consistent with numeric time zone
714 abbreviations already used elsewhere. The change affects several
715 arctic and antarctic locations, e.g., America/Cambridge_Bay before
716 1920 and Antarctica/Troll before 2005.
718 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
719 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
723 zic now outputs a dummy transition at time 2**31 - 1 in zones
724 whose POSIX-style TZ strings contain a '<'. This mostly works
725 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
726 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
728 Changes affecting documentation and commentary
730 tz-link.htm says why governments should give plenty of notice for
731 time zone or DST changes, and refers to Matt Johnson's blog post.
733 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
736 Release 2016d - 2016-04-17 22:50:29 -0700
738 Changes affecting future time stamps
740 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
741 (Thanks to Alexander Krivenyshev for the heads-up.)
743 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
744 (Thanks to Alexander Krivenyshev and Matt Johnson.)
746 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
747 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
748 at 02:00. (Thanks to Stepan Golosunov.)
750 Changes affecting past time stamps
752 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
753 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
754 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
755 the same change. (Thanks to Stepan Golosunov.)
757 Russia and nearby locations had daylight-saving transitions on
758 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
759 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
762 Many corrections to historical time in Kazakhstan from 1991
763 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
764 invented time zone abbreviations with numeric abbreviations.
766 Changes to commentary
768 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
771 Release 2016c - 2016-03-23 00:51:27 -0700
773 Changes affecting future time stamps
775 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
777 Chile reverts from permanent to seasonal DST. (Thanks to Juan
778 Correa for the heads-up, and to Tim Parenti for corrections.)
779 Guess that future transitions are August's and May's second
780 Saturdays at 24:00 mainland time. Also, call the period from
781 2014-09-07 through 2016-05-14 daylight saving time instead of
782 standard time, as that seems more appropriate now.
784 Changes affecting past time stamps
786 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
787 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
788 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
789 (Thanks to Stepan Golosunov.)
791 Changes to commentary
793 Several updates and URLs for historical and proposed Russian changes.
794 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
797 Release 2016b - 2016-03-12 17:30:14 -0800
801 Starting with release 2016b, some data entries cause zic implementations
802 derived from tz releases 2005j through 2015e to issue warnings like
803 "time zone abbreviation differs from POSIX standard (+03)".
804 These warnings should not otherwise affect zic's output and can safely be
805 ignored on today's platforms, as the warnings refer to a restriction in
806 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
807 warnings is to upgrade to zic derived from tz releases 2015f and later.
809 Changes affecting future time stamps
811 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
812 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
813 2016-03-27 at 02:00 local time. They need distinct zones since their
814 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
815 Altai Republic, Russia, which will switch from +06 to +07 on the same date
816 and local time. The Astrakhan change is already official; the others have
817 passed the first reading in the State Duma and are extremely likely.
818 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
819 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
820 and Stepan Golosunov for followup.)
822 As a trial of a new system that needs less information to be made up,
823 the new zones use numeric time zone abbreviations like "+04"
824 instead of invented abbreviations like "ASTT".
826 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
829 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
830 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
831 Saturday at 01:00, not March's last Friday at 24:00.
833 Changes affecting past time stamps
835 Europe/Chisinau observed DST during 1990, and switched from +04 to
836 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
837 (Thanks to Stepan Golosunov.)
839 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
840 KUYT/KUYST. (Thanks to Stepan Golosunov.)
844 tzselect's diagnostics and checking, and checktab.awk's checking,
845 have been improved. (Thanks to J William Piggott.)
847 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
849 tzselect now tests Julian-date TZ settings more accurately.
850 (Thanks to J William Piggott.)
852 Changes to commentary
854 Comments in zone tables have been improved. (Thanks to J William Piggott.)
856 tzselect again limits its menu comments so that menus fit on a
857 24x80 alphanumeric display.
859 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
861 In the Theory file, the description of possible time zone abbreviations in
862 tzdata has been cleaned up, as the old description was unclear and
863 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
866 Release 2016a - 2016-01-26 23:28:02 -0800
868 Changes affecting future time stamps
870 America/Cayman will not observe daylight saving this year after all.
871 Revert our guess that it would. (Thanks to Matt Johnson.)
873 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
874 (Thanks to Alexander Krivenyshev.)
876 Asia/Tehran now has DST predictions for the year 2038 and later,
877 to be March 21 00:00 to September 21 00:00. This is likely better
878 than predicting no DST, albeit off by a day every now and then.
880 Changes affecting past and future time stamps
882 America/Metlakatla switched from PST all year to AKST/AKDT on
883 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
885 America/Santa_Isabel has been removed, and replaced with a
886 backward compatibility link to America/Tijuana. Its contents were
887 apparently based on a misreading of Mexican legislation.
889 Changes affecting past time stamps
891 Asia/Karachi's two transition times in 2002 were off by a minute.
892 (Thanks to Matt Johnson.)
894 Changes affecting build procedure
896 An installer can now combine leap seconds with use of the backzone file,
897 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
898 The old 'make posix_packrat' rule is now marked as obsolescent.
899 (Thanks to Ian Abbott for an initial implementation.)
901 Changes affecting documentation and commentary
903 A new file LICENSE makes it easier to see that the code and data
904 are mostly public-domain. (Thanks to James Knight.) The three
905 non-public-domain files now use the current (3-clause) BSD license
906 instead of older versions of that license.
908 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
909 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
910 on editing tz source files (with a mention of Sublime zoneinfo,
911 thanks to Gilmore Davidson).
913 The Theory and asia files now mention the 2015 book "The Global
914 Transformation of Time, 1870-1950", and cite a couple of reviews.
916 The America/Chicago entry now documents the informal use of US
917 central time in Fort Pierre, South Dakota. (Thanks to Rick
918 McDermid, Matt Johnson, and Steve Jones.)
921 Release 2015g - 2015-10-01 00:39:51 -0700
923 Changes affecting future time stamps
925 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
928 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
929 (Thanks to Alexander Krivenyshev.)
931 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
932 (Thanks to Ken Rylander.)
934 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
935 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
936 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
938 Changes affecting past time stamps
940 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
942 Changes affecting code
944 localtime no longer mishandles America/Anchorage after 2037.
945 (Thanks to Bradley White for reporting the bug.)
947 On hosts with signed 32-bit time_t, localtime no longer mishandles
948 Pacific/Fiji after 2038-01-16 14:00 UTC.
950 The localtime module allows the variables 'timezone', 'daylight',
951 and 'altzone' to be in common storage shared with other modules,
952 and declares them in case the system <time.h> does not.
953 (Problems reported by Kees Dekker.)
955 On platforms with tm_zone, strftime.c now assumes it is not NULL.
956 This simplifies the code and is consistent with zdump.c.
957 (Problem reported by Christos Zoulas.)
959 Changes affecting documentation
961 The tzfile man page now documents that transition times denote the
962 starts (not the ends) of the corresponding time periods.
963 (Ambiguity reported by Bill Seymour.)
966 Release 2015f - 2015-08-10 18:06:56 -0700
968 Changes affecting future time stamps
970 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
971 The abbreviation remains "KST". (Thanks to Robert Elz.)
973 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
976 Changes affecting past and future time stamps
978 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
979 (Thanks to Roman Tudos.)
981 Changes affecting data format and code
983 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
984 field of a Rule line should now be '-'; the old values 'even',
985 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
986 Although the implementation has not changed, these features do not
987 work in the default installation, they are not used in the data,
988 and they are now considered obsolescent.
990 zic now checks that two rules don't take effect at the same time.
991 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
992 simultaneity are now documented.
994 The two characters '%z' in a zone format now stand for the UT
995 offset, e.g., '-07' for seven hours behind UT and '+0530' for
996 five hours and thirty minutes ahead. This better supports time
997 zone abbreviations conforming to POSIX.1-2001 and later.
999 Changes affecting installed data files
1001 Comments for America/Halifax and America/Glace_Bay have been improved.
1002 (Thanks to Brian Inglis.)
1004 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1005 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1006 installed data files for Europe/Simferopol and Europe/Tallinn.
1007 It does not affect timestamps. (Thanks to Howard Hinnant.)
1009 Changes affecting code
1011 zdump and zic no longer warn about valid time zone abbreviations
1014 Some Visual Studio 2013 warnings have been suppressed.
1015 (Thanks to Kees Dekker.)
1017 'date' no longer sets the time of day and its -a, -d, -n and -t
1018 options have been removed. Long obsolescent, the implementation
1019 of these features had porting problems. Builders no longer need
1020 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1021 (Thanks to Kees Dekker for pointing out the problem.)
1023 Changes affecting documentation
1025 The Theory file mentions naming issues earlier, as these seem to be
1026 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1028 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1030 Mention that Herbert Samuel introduced the term "Summer Time".
1033 Release 2015e - 2015-06-13 10:56:02 -0700
1035 Changes affecting future time stamps
1037 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1038 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1040 Assume Cayman Islands will observe DST starting next year, using US rules.
1041 Although it isn't guaranteed, it is the most likely.
1043 Changes affecting data format
1045 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1046 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1048 Changes affecting code
1050 When displaying data, tzselect converts it to the current locale's
1051 encoding if the iconv command works. (Problem reported by random832.)
1053 tzselect no longer mishandles Dominica, fixing a bug introduced
1054 in Release 2014f. (Problem reported by Owen Leibman.)
1056 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1057 This fixes a bug introduced in Release 2014f.
1058 (Problem reported by Leonardo Chiquitto.)
1061 Release 2015d - 2015-04-24 08:09:46 -0700
1063 Changes affecting future time stamps
1065 Egypt will not observe DST in 2015 and will consider canceling it
1066 permanently. For now, assume no DST indefinitely.
1067 (Thanks to Ahmed Nazmy and Tim Parenti.)
1069 Changes affecting past time stamps
1071 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1072 1966-07-01. Also, Yukon's time zone history is documented better.
1073 (Thanks to Brian Inglis and Dennis Ferguson.)
1075 Change affecting past and future time zone abbreviations
1077 The abbreviations for Hawaii-Aleutian standard and daylight times
1078 have been changed from HAST/HADT to HST/HDT, as per US Government
1079 Printing Office style. This affects only America/Adak since 1983,
1080 as America/Honolulu was already using the new style.
1082 Changes affecting code
1084 zic has some minor performance improvements.
1087 Release 2015c - 2015-04-11 08:55:55 -0700
1089 Changes affecting future time stamps
1091 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1092 not 00:00 on April's last Friday. 2015's transition will therefore be on
1093 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1094 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1096 Changes affecting past time stamps
1098 The following changes affect some pre-1991 Chile-related time stamps
1099 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1101 The 1910 transition was January 10, not January 1.
1103 The 1918 transition was September 10, not September 1.
1105 The UT -04 time observed from 1932 to 1942 is now considered to
1106 be standard time, not year-round DST.
1108 Santiago observed DST (UT -03) from 1946-07-15 through
1109 1946-08-31, then reverted to standard time, then switched to -05
1112 Assume transitions before 1968 were at 00:00, since we have no data
1115 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1116 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1118 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1119 and omit all transitions on Pacific/Easter from 1942 through 1946
1120 since we have no data suggesting that they existed.
1122 One more zone has been turned into a link, as it differed
1123 from an existing zone only for older time stamps. As usual,
1124 this change affects UT offsets in pre-1970 time stamps only.
1125 The zone's old contents have been moved to the 'backzone' file.
1126 The affected zone is America/Montreal.
1128 Changes affecting commentary
1130 Mention the TZUpdater tool.
1132 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1135 Release 2015b - 2015-03-19 23:28:11 -0700
1137 Changes affecting future time stamps
1139 Mongolia will start observing DST again this year, from the last
1140 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1141 (Thanks to Ganbold Tsagaankhuu.)
1143 Palestine will start DST on March 28, not March 27. Also,
1144 correct the fall 2014 transition from September 26 to October 24.
1145 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1147 Changes affecting past time stamps
1149 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1150 regression. (Thanks to Stuart Bishop for reporting the problem.)
1152 Some more zones have been turned into links, when they differed
1153 from existing zones only for older time stamps. As usual,
1154 these changes affect UT offsets in pre-1970 time stamps only.
1155 Their old contents have been moved to the 'backzone' file.
1156 The affected zones are: America/Antigua, America/Cayman,
1157 Pacific/Midway, and Pacific/Saipan.
1159 Changes affecting time zone abbreviations
1161 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1164 Changes affecting code
1166 Fix integer overflow bug in reference 'mktime' implementation.
1167 (Problem reported by Jörg Richter.)
1169 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1170 to be used in the same executable as standard-library time_t functions.
1171 (Problems reported by Bradley White.)
1173 Changes affecting commentary
1175 Cite the recent Mexican decree changing Quintana Roo's time zone.
1176 (Thanks to Carlos Raúl Perasso.)
1178 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1180 Update info about Mars time.
1183 Release 2015a - 2015-01-29 22:35:20 -0800
1185 Changes affecting future time stamps
1187 The Mexican state of Quintana Roo, represented by America/Cancun,
1188 will shift from Central Time with DST to Eastern Time without DST
1189 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1191 Chile will not change clocks in April or thereafter; its new standard time
1192 will be its old daylight saving time. This affects America/Santiago,
1193 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1195 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1196 (Thanks to Tim Parenti.)
1198 Changes affecting past time stamps
1200 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1201 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1202 Shanks about time in Iceland between 1837 and 1908.
1204 Some more zones have been turned into links, when they differed
1205 from existing zones only for older time stamps. As usual,
1206 these changes affect UT offsets in pre-1970 time stamps only.
1207 Their old contents have been moved to the 'backzone' file.
1208 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1211 Changes affecting code
1213 tzalloc now scrubs time zone abbreviations compatibly with the way
1214 that tzset always has, by replacing invalid bytes with '_' and by
1215 shortening too-long abbreviations.
1217 tzselect ports to POSIX awk implementations, no longer mishandles
1218 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1219 settings to the user. (Thanks to Stefan Kuhn.)
1221 Changes affecting build procedure
1223 'make check' now checks for links to links in the data.
1224 One such link (for Africa/Asmera) has been fixed.
1225 (Thanks to Stephen Colebourne for pointing out the problem.)
1227 Changes affecting commentary
1229 The leapseconds file commentary now mentions the expiration date.
1230 (Problem reported by Martin Burnicki.)
1232 Update Mexican Library of Congress URL.
1235 Release 2014j - 2014-11-10 17:37:11 -0800
1237 Changes affecting current and future time stamps
1239 Turks & Caicos' switch from US eastern time to UT -04 year-round
1240 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1241 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1243 Changes affecting past time stamps
1245 Many pre-1989 time stamps have been corrected for Asia/Seoul and
1246 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1247 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1248 longer guess that Pyongyang mimicked Seoul time after World War II,
1249 as this is politically implausible.
1251 Some more zones have been turned into links, when they differed
1252 from existing zones only for older time stamps. As usual,
1253 these changes affect UT offsets in pre-1970 time stamps only.
1254 Their old contents have been moved to the 'backzone' file.
1255 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1256 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1257 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1260 Changes affecting commentary
1262 The commentary is less enthusiastic about Shanks as a source,
1263 and is more careful to distinguish UT from UTC.
1266 Release 2014i - 2014-10-21 22:04:57 -0700
1268 Changes affecting future time stamps
1270 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1271 (Thanks to Ken Rylander for the heads-up.) Guess that future
1272 years will use a similar pattern.
1274 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1275 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1276 (Thanks to Kiley Walbom for the heads-up.)
1278 Changes affecting time zone abbreviations
1280 Since Belarus is not changing its clocks even though Moscow is,
1281 the time zone abbreviation in Europe/Minsk is changing from FET
1282 to its more-traditional value MSK on 2014-10-26 at 01:00.
1283 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1285 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1286 Indochina, to distinguish it better from ICT (+07).
1288 Changes affecting past time stamps
1290 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1291 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1292 authoritative book). Asia/Ho_Chi_Minh has been added to
1293 zone1970.tab, to give tzselect users in Vietnam two choices,
1294 since north and south Vietnam disagreed after our 1970 cutoff.
1296 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1297 they differed from existing zones only for older time stamps. As
1298 usual, these changes affect pre-1970 time stamps only. Their old
1299 contents have been moved to the 'backzone' file.
1301 Changes affecting code
1303 The time-related library functions now set errno on failure, and
1304 some crashes in the new tzalloc-related library functions have
1305 been fixed. (Thanks to Christos Zoulas for reporting most of
1306 these problems and for suggesting fixes.)
1308 If USG_COMPAT is defined and the requested timestamp is standard time,
1309 the tz library's localtime and mktime functions now set the extern
1310 variable timezone to a value appropriate for that timestamp; and
1311 similarly for ALTZONE, daylight saving time, and the altzone variable.
1312 This change is a companion to the tzname change in 2014h, and is
1313 designed to make timezone and altzone more compatible with tzname.
1315 The tz library's functions now set errno to EOVERFLOW if they fail
1316 because the result cannot be represented. ctime and ctime_r now
1317 return NULL and set errno when a timestamp is out of range, rather
1318 than having undefined behavior.
1320 Some bugs associated with the new 2014g functions have been fixed.
1321 This includes a bug that largely incapacitated the new functions
1322 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1323 It also includes some uses of uninitialized variables after tzalloc.
1324 The new code uses the standard type 'ssize_t', which the Makefile
1325 now gives porting advice about.
1327 Changes affecting commentary
1329 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1332 Release 2014h - 2014-09-25 18:59:03 -0700
1334 Changes affecting past timestamps
1336 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1338 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1339 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1341 Some more zones have been turned into links, when they differed
1342 from existing zones only for older timestamps. As usual,
1343 these changes affect UT offsets in pre-1970 timestamps only.
1344 Their old contents have been moved to the 'backzone' file.
1345 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1346 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1347 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1349 Changes affecting code
1351 zdump -V and -v now output gmtoff= values on all platforms,
1352 not merely on platforms defining TM_GMTOFF.
1354 The tz library's localtime and mktime functions now set tzname to a value
1355 appropriate for the requested timestamp, and zdump now uses this
1356 on platforms not defining TM_ZONE, fixing a 2014g regression.
1357 (Thanks to Tim Parenti for reporting the problem.)
1359 The tz library no longer sets tzname if localtime or mktime fails.
1361 zdump -c no longer mishandles transitions near year boundaries.
1362 (Thanks to Tim Parenti for reporting the problem.)
1364 An access to uninitialized data has been fixed.
1365 (Thanks to Jörg Richter for reporting the problem.)
1367 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1368 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1369 and two threads race to initialize data used by gmtime-like functions.
1370 (Thanks to Andy Heninger for reporting the problems.)
1372 Changes affecting build procedure
1374 'make check' now checks better for properly-sorted data.
1376 Changes affecting documentation and commentary
1378 zdump's gmtoff=N output is now documented, and its isdst=D output
1379 is now documented to possibly output D values other than 0 or 1.
1381 zdump -c's treatment of years is now documented to use the
1382 Gregorian calendar and Universal Time without leap seconds,
1383 and its behavior at cutoff boundaries is now documented better.
1384 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1386 Programs are now documented to use the proleptic Gregorian calendar.
1387 (Thanks to Alan Barrett for the suggestion.)
1389 Fractional-second GMT offsets have been documented for civil time
1390 in 19th-century Chennai, Jakarta, and New York.
1393 Release 2014g - 2014-08-28 12:31:23 -0700
1395 Changes affecting future timestamps
1397 Turks & Caicos is switching from US eastern time to UT -04
1398 year-round, modeled as a switch on 2014-11-02 at 02:00.
1399 [As noted in 2014j, this switch was later delayed.]
1401 Changes affecting past timestamps
1403 Time in Russia or the USSR before 1926 or so has been corrected by
1404 a few seconds in the following zones: Asia/Irkutsk,
1405 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1406 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1407 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1408 Vladimir Karpinsky.)
1410 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1411 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1412 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1413 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1414 (Thanks to Stephen Colebourne for pointing to the decree.)
1416 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1418 A new file 'backzone' contains data which may appeal to
1419 connoisseurs of old timestamps, although it is out of scope for
1420 the tz database, is often poorly sourced, and contains some data
1421 that is known to be incorrect. The new file is not recommended
1422 for ordinary use and its entries are not installed by default.
1423 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1424 Isle of Man entries.)
1426 Some more zones have been turned into links, when they differed
1427 from existing zones only for older timestamps. As usual,
1428 these changes affect UT offsets in pre-1970 timestamps only.
1429 Their old contents have been moved to the 'backzone' file.
1430 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1431 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1432 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1434 Changes affecting code
1436 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1437 supplies functions for creating and using objects that represent
1438 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1439 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1440 time2posix_z. They are intended for performance: for example,
1441 localtime_rz (unlike localtime_r) is trivially thread-safe without
1442 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1443 functions, and to Alan Barrett and Jonathan Lennox for helping to
1446 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1447 This lets zdump use tz features even if the system library lacks them.
1448 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1449 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1451 zdump now uses localtime_rz if available, as it's significantly faster,
1452 and it can help zdump better diagnose invalid time zone names.
1453 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1454 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1455 not available, zdump now uses localtime_r and tzset if available,
1456 as this is a bit cleaner and faster than plain localtime. Compile
1457 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1458 lacks these two functions.
1460 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1461 Although not needed for tz's own applications, which are single-threaded,
1462 this supports POSIX better if the tz library is used in multithreaded apps.
1464 Some crashes have been fixed when zdump or the tz library is given
1465 invalid or outlandish input.
1467 The tz library no longer mishandles leap seconds on platforms with
1468 unsigned time_t in time zones that lack ordinary transitions after 1970.
1470 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1471 already defined, to make it easier to configure on common platforms.
1472 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1474 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1475 assumes that reading uninitialized memory yields garbage values
1476 but does not cause other problems such as traps.
1478 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1479 more likely to guess right for ambiguous timestamps near
1480 transitions where tm_isdst does not change.
1482 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1483 strftime_l for compatibility with recent versions of POSIX.
1484 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1485 to 1 on recent POSIX versions, and to 0 otherwise.
1487 tzselect -c now uses a hybrid distance measure that works better
1488 in Africa. (Thanks to Alan Barrett for noting the problem.)
1490 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1491 or when time_tz is defined.
1493 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1494 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1495 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1496 This affects GNU/Linux and similar systems.
1498 For easier maintenance later, some C code has been simplified,
1499 some lint has been removed, and the code has been tweaked so that
1500 plain 'make' is more likely to work.
1502 The C type 'bool' is now used for boolean values, instead of 'int'.
1504 The long-obsolete LOCALE_HOME code has been removed.
1506 The long-obsolete 'gtime' function has been removed.
1508 Changes affecting build procedure
1510 'zdump' no longer links in ialloc.o, as it's not needed.
1512 'make check_time_t_alternatives' no longer assumes GNU diff.
1514 Changes affecting distribution tarballs
1516 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1517 the tzdata tarball instead of the tzcode tarball, since they help
1518 maintain the data. The NEWS and Theory files are now also
1519 distributed in the tzdata tarball, as they're relevant for data.
1520 (Thanks to Alan Barrett for pointing this out.) Also, the
1521 leapseconds.awk file is no longer distributed in the tzcode
1522 tarball, since it belongs in the tzdata tarball (where 2014f
1523 inadvertently also distributed it).
1525 Changes affecting documentation and commentary
1527 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1528 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1531 The man pages have been updated to use function prototypes,
1532 to document thread-safe variants like localtime_r, and to document
1533 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1536 The fields in Link lines have been renamed to be more descriptive
1537 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1538 and LINK-TO has become LINK-NAME.
1540 tz-link.htm mentions the IETF's tzdist working group; Windows
1541 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1543 Some broken URLs have been fixed in the commentary. (Thanks to
1546 Commentary about Philippines DST has been updated, and commentary
1547 on pre-1970 time in India has been added.
1550 Release 2014f - 2014-08-05 17:42:36 -0700
1552 Changes affecting future timestamps
1554 Russia will subtract an hour from most of its time zones on 2014-10-26
1555 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1556 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1557 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1558 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1559 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1560 (Europe/Samara) are not changing their clocks. The changed zones are
1561 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1562 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1563 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1564 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1565 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1566 but not its UTC offset. Two zones are added: Asia/Chita (split
1567 from Asia/Yakutsk, and also with two hours subtracted) and
1568 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1569 subtracted). (Thanks to Tim Parenti for much of the above.)
1571 Changes affecting time zone abbreviations
1573 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1574 and similarly for the other Australian zones. That is, for eastern
1575 standard and daylight saving time the abbreviations are AEST and AEDT
1576 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1577 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1578 This change does not affect UT offsets, only time zone abbreviations.
1579 (Thanks to Rich Tibbett and many others.)
1581 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1582 effective 2014-10-26 at 02:00 local time.
1584 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1585 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1587 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1588 Similarly, prefer EET/EEST for eastern European time in Russia.
1590 Change time zone abbreviations in (western) Samoa to use "ST" and
1591 "DT" suffixes, as this is more likely to match common practice.
1592 Prefix "W" to (western) Samoa time when its standard-time offset
1593 disagrees with that of American Samoa.
1595 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1597 Time zone abbreviations have been updated for Japan's two time
1598 zones used 1896-1937. JWST now stands for Western Standard
1599 Time, and JCST for Central Standard Time (formerly this was CJT).
1600 These abbreviations are now used for time in Korea, Taiwan,
1601 and Sakhalin while controlled by Japan.
1603 Changes affecting past timestamps
1605 China's five zones have been simplified to two, since the post-1970
1606 differences in the other three seem to have been imaginary. The
1607 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1608 removed; backwards-compatibility links still work, albeit with
1609 different behaviors for timestamps before May 1980. Asia/Urumqi's
1610 1980 transition to UT +08 has been removed, so that it is now at
1611 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1612 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1614 Some zones have been turned into links, when they differed from existing
1615 zones only for older UT offsets where data entries were likely invented.
1616 These changes affect UT offsets in pre-1970 timestamps only. This is
1617 similar to the change in release 2013e, except this time for western
1618 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1619 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1620 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1621 Atlantic/St_Helena. This also affects the backwards-compatibility
1622 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1623 Tim Parenti, and David Patte for reporting problems in earlier
1624 versions of this change.)
1626 Asia/Shanghai's pre-standard-time UT offset has been changed from
1627 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1628 transition to standard time has been changed from 1928 to 1901.
1630 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1631 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1632 In 1946 it observed DST from 05-15 through 09-30; in 1947
1633 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1634 (Thanks to Yu-Cheng Chuang.)
1636 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1638 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1639 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1641 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1642 period from 1911 to 1950.
1644 Pacific/Chatham has been changed to New Zealand standard time plus
1645 45 minutes for the period before 1957, reflecting a 1956 remark in
1646 the New Zealand parliament.
1648 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1649 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1650 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1651 not 04-06 at 02:00; and there was no DST in 1920.
1653 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1655 Time in Russia before 1927 or so has been corrected by a few seconds in
1656 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1657 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1658 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1659 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1661 Changes affecting data format
1663 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1664 The new file's extended format allows multiple country codes per zone.
1665 The older file is still installed but is deprecated; its format is
1666 not changing and it will still be distributed for a while, but new
1667 applications should use the new file.
1669 The new file format simplifies maintenance of obscure locations.
1670 To test this, it adds coverage for the Crozet Islands and the
1671 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1673 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1674 It is still ASCII now, but commentary about the switch has been added.
1675 The new file 'zone1970.tab' already uses UTF-8.
1677 Changes affecting code
1679 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1680 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1682 'zic' no longer mishandles input when ignoring case in locales that
1683 are not compatible with English, e.g., unibyte Turkish locales when
1684 compiled with HAVE_GETTEXT.
1686 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1687 they no longer use ASCII '-' as if it were a dash.
1689 'zic' now rejects output file names that contain '.' or '..' components.
1690 (Thanks to Tim Parenti for reporting the problem.)
1692 'zic -v' now warns about output file names that do not follow
1693 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1694 David Olson for starting the ball rolling on this.)
1696 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1698 Changes affecting build procedure
1700 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1701 (Thanks to John Cochran.)
1703 Changes affecting documentation and commentary
1705 The 'Theory' file documents legacy names, the longstanding
1706 exceptions to the POSIX-inspired file name rules.
1708 The 'zic' documentation clarifies the role of time types when
1709 interpreting dates. (Thanks to Arthur David Olson.)
1711 Documentation and commentary now prefer UTF-8 to US-ASCII,
1712 allowing the use of proper accents in foreign words and names.
1713 Code and data have not changed because of this. (Thanks to
1714 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1717 Non-HTML documentation and commentary now use plain-text URLs instead of
1718 HTML insertions, and are more consistent about bracketing URLs when they
1719 are not already surrounded by white space. (Thanks to suggestions by
1722 There is new commentary about Xujiahui Observatory, the five time-zone
1723 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1724 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1725 warlord Jin Shuren in the data.
1727 Commentary about the coverage of each Russian zone has been standardized.
1728 (Thanks to Tim Parenti).
1730 There is new commentary about contemporary timekeeping in Ethiopia.
1732 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1734 There is new commentary about time in Poland in 1919.
1736 Proper credit has been given to DST inventor George Vernon Hudson.
1738 Commentary about time in Metlakatla, AK and Resolute, NU has been
1739 improved, with a new source for the former.
1741 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1744 Commentary about permanent Antarctic bases has been updated.
1746 Several typos have been corrected. (Thanks to Tim Parenti for
1747 contributing some of these fixes.)
1749 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1750 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1751 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1752 (Thanks to a heads-up from Dirkjan Ochtman.)
1754 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1755 have been removed. These obsolescent US Naval Observatory entries were no
1756 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1759 Release 2014e - 2014-06-12 21:53:52 -0700
1761 Changes affecting near-future timestamps
1763 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1764 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1765 switch to standard time at 24:00 the last Thursday before Ramadan, and
1766 back to DST at 00:00 the first Friday after Ramadan.
1768 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1769 to Milamber Space Network.) Guess that from 2015 on Morocco will
1770 temporarily switch to standard time at 03:00 the last Saturday before
1771 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1773 Changes affecting past timestamps
1775 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1776 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1777 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1778 in 1991. (Thanks to Hank W. for reporting the problems.)
1780 Changes affecting commentary
1782 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1783 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1784 removes stale pointers to World Time Explorer and WORLDTIME.
1787 Release 2014d - 2014-05-27 21:34:40 -0700
1789 Changes affecting code
1791 zic no longer generates files containing timestamps before the Big Bang.
1792 This works around GNOME bug 730332
1793 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1794 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1795 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1797 Changes affecting documentation
1799 tz-link.htm now mentions GNOME.
1802 Release 2014c - 2014-05-13 07:44:13 -0700
1804 Changes affecting near-future timestamps
1806 Egypt observes DST starting 2014-05-15 at 24:00.
1807 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1808 Details have not been announced, except that DST will not be observed
1809 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1810 Morocco, and that Egypt's future spring and fall transitions will be the
1811 same as 2010 when it last observed DST, namely April's last Friday at
1812 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1813 that Ramadan transitions will be at 00:00 standard time.
1815 Changes affecting code
1817 zic now generates transitions for minimum time values, eliminating guesswork
1818 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
1820 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1822 Changes affecting commentary and documentation
1824 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1827 Release 2014b - 2014-03-24 21:28:50 -0700
1829 Changes affecting near-future timestamps
1831 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1832 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1834 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1835 Bengt-Inge Larsson.) This is currently an approximation; a better version
1836 will require the zic and localtime fixes mentioned below, and the plan is
1837 to wait for a while until at least the zic fixes propagate.
1839 Changes affecting code
1841 'zic' and 'localtime' no longer reject locations needing four transitions
1842 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1843 Also, 'zic' avoids some unlikely failures due to integer overflow.
1845 Changes affecting build procedure
1847 'make check' now detects Rule lines defined but never used.
1848 The NZAQ rules, an instance of this problem, have been removed.
1850 Changes affecting commentary and documentation
1852 Fix Tuesday/Thursday typo in description of time in Israel.
1853 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1855 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1856 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1857 library supports them.
1859 Add comments about Johnston Island time in the 1960s.
1860 (Thanks to Lyle McElhaney.)
1862 Morocco's 2014 DST start will be as predicted.
1863 (Thanks to Sebastien Willemijns.)
1866 Release 2014a - 2014-03-07 23:30:29 -0800
1868 Changes affecting near-future timestamps
1870 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1871 the heads-up, and to Tim Parenti for simplifying the update.)
1873 Changes affecting past timestamps
1875 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1876 (Thanks to Steffen Thorsen.)
1878 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1879 (not 1992-01-01), and observed DST during the entire next winter.
1880 (Thanks to Vladimir in Moscow via Alois Treindl.)
1882 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1883 (Thanks to Avigdor Finkelstein.)
1885 Changes affecting code
1887 A uninitialized-storage bug in 'localtime' has been fixed.
1888 (Thanks to Logan Chien.)
1890 Changes affecting the build procedure
1892 The settings for 'make check_web' now default to Ubuntu 13.10.
1894 Changes affecting commentary and documentation
1896 The boundary of the US Pacific time zone is given more accurately.
1897 (Thanks to Alan Mintz.)
1899 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1901 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1903 Better descriptions of countries with same time zone history as
1904 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1906 Several changes affect tz-link.htm, the main web page.
1908 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1911 Mention xCal (Internet RFC 6321) and jCal.
1913 Microsoft has some support for tz database names.
1915 CLDR data formats include both XML and JSON.
1917 Mention Maggiolo's map of solar vs standard time.
1918 (Thanks to Arthur David Olson.)
1920 Mention TZ4Net. (Thanks to Matt Johnson.)
1922 Mention the timezone-olson Haskell package.
1924 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1926 Remove moribund links to daylight-savings-time.info and to
1927 Simple Timer + Clocks.
1929 Update two links. (Thanks to Oscar van Vlijmen.)
1931 Fix some formatting glitches, e.g., remove random newlines from
1932 abbr elements' title attributes.
1935 Release 2013i - 2013-12-17 07:25:23 -0800
1937 Changes affecting near-future timestamps:
1939 Jordan switches back to standard time at 00:00 on December 20, 2013.
1940 The 2006-2011 transition schedule is planned to resume in 2014.
1941 (Thanks to Steffen Thorsen.)
1943 Changes affecting past timestamps:
1945 In 2004, Cuba began DST on March 28, not April 4.
1946 (Thanks to Steffen Thorsen.)
1948 Changes affecting code
1950 The compile-time flag NOSOLAR has been removed, as nowadays the
1951 benefit of slightly shrinking runtime table size is outweighed by the
1952 cost of disallowing potential future updates that exceed old limits.
1954 Changes affecting documentation and commentary
1956 The files solar87, solar88, and solar89 are no longer distributed.
1957 They were a negative experiment - that is, a demonstration that
1958 tz data can represent solar time only with some difficulty and error.
1959 Their presence in the distribution caused confusion, as Riyadh
1960 civil time was generally not solar time in those years.
1962 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1965 Release 2013h - 2013-10-25 15:32:32 -0700
1967 Changes affecting current and future timestamps:
1969 Libya has switched its UT offset back to +02 without DST, instead
1970 of +01 with DST. (Thanks to Even Scharning.)
1972 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1973 (Thanks to Gwillim Law.)
1975 Changes affecting future timestamps:
1977 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1978 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1979 (Thanks to Steffen Thorsen.)
1981 Add entries for DST transitions in Morocco in the year 2038.
1982 This avoids some year-2038 glitches introduced in 2013g.
1983 (Thanks to Yoshito Umaoka for reporting the problem.)
1985 Changes affecting API
1987 The 'tzselect' command no longer requires the 'select' command,
1988 and should now work with /bin/sh on more platforms. It also works
1989 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1990 Patrick 'P. J.' McDermott and Alan Barrett.)
1992 Changes affecting code
1994 Fix localtime overflow bugs with 32-bit unsigned time_t.
1996 zdump no longer assumes sscanf returns maximal values on overflow.
1998 Changes affecting the build procedure
2000 The builder can specify which programs to use, if any, instead of
2001 'ar' and 'ranlib', and libtz.a is now built locally before being
2002 installed. (Thanks to Michael Forney.)
2004 A dependency typo in the 'zdump' rule has been fixed.
2005 (Thanks to Andrew Paprocki.)
2007 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2008 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2010 'make clean' no longer removes 'leapseconds', since it's
2011 host-independent and is part of the distribution.
2013 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2015 Changes affecting documentation and commentary
2017 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2018 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2020 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2021 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2022 longer maintained) and for old advisories. SOFA now does C.
2024 Release 2013g - 2013-09-30 21:08:26 -0700
2026 Changes affecting current and near-future timestamps
2028 Morocco now observes DST from the last Sunday in March to the last
2029 Sunday in October, not April to September respectively. (Thanks
2030 to Steffen Thorsen.)
2032 Changes affecting 'zic'
2034 'zic' now runs on platforms that lack both hard links and symlinks.
2035 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2036 Also, fix some bugs on platforms that lack hard links but have symlinks.
2038 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2039 to predict the far future, fixing a bug introduced in 2013e.
2041 Changes affecting the build procedure
2043 The 'leapseconds' file is again put into the tzdata tarball.
2044 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2045 Matt Burgess and Ian Abbott.) The timestamps of these and other
2046 dependent files in tarballs are adjusted more consistently.
2048 Changes affecting documentation and commentary
2050 The README file is now part of the data tarball as well as the code.
2051 It now states that files are public domain unless otherwise specified.
2052 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2053 Its details about the 1989 release moved to a place of honor near
2057 Release 2013f - 2013-09-24 23:37:36 -0700
2059 Changes affecting near-future timestamps
2061 Tocantins will very likely not observe DST starting this spring.
2062 (Thanks to Steffen Thorsen.)
2064 Jordan will likely stay at UT +03 indefinitely, and will not fall
2067 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2069 Changes affecting API
2071 The types of the global variables 'timezone' and 'altzone' (if present)
2072 have been changed back to 'long'. This is required for 'timezone'
2073 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2074 These variables were originally 'long' in the tz code, but were
2075 mistakenly changed to 'time_t' in 1987; nobody reported the
2076 incompatibility until now. The difference matters on x32, where
2077 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2079 Changes affecting the build procedure
2081 Avoid long strings in leapseconds.awk to work around a mawk bug.
2082 (Thanks to Cyril Baurand.)
2084 Changes affecting documentation and commentary
2086 New file 'NEWS' that contains release notes like this one.
2088 Paraguay's law does not specify DST transition time; 00:00 is customary.
2089 (Thanks to Waldemar Villamayor-Venialbo.)
2091 Minor capitalization fixes.
2093 Changes affecting version-control only
2095 The experimental GitHub repository now contains annotated and
2096 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2097 Releases are tagged starting with 2012e; earlier releases were
2098 done differently, and tags would either not have a simple name or
2099 not exactly match what was released.
2101 'make set-timestamps' is now simpler and a bit more portable.
2104 Release 2013e - 2013-09-19 23:50:04 -0700
2106 Changes affecting near-future timestamps
2108 This year Fiji will start DST on October 27, not October 20.
2109 (Thanks to David Wheeler for the heads-up.) For now, guess that
2110 Fiji will continue to spring forward the Sunday before the fourth
2113 Changes affecting current and future time zone abbreviations
2115 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2116 time zone abbreviations since 1932. (Thanks to George Ziegler,
2117 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2118 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2119 Asia/Makassar, and Asia/Pontianak.
2121 Use ART (UT -03, standard time), rather than WARST (also -03, but
2122 daylight saving time) for San Luis, Argentina since 2009.
2124 Changes affecting Godthåb timestamps after 2037 if version mismatch
2126 Allow POSIX-like TZ strings where the transition time's hour can
2127 range from -167 through 167, instead of the POSIX-required 0
2128 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2129 new Fiji rules. This is a more-compact way to represent
2130 far-future timestamps for America/Godthab, America/Santiago,
2131 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2132 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2133 this change. (Derived from a suggestion by Arthur David Olson.)
2135 Allow POSIX-like TZ strings where daylight saving time is in
2136 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2137 Argentina Summer Time all year. This supports a more-compact way
2138 to represent the 2013d data for America/Argentina/San_Luis.
2139 Because of the change for San Luis noted above this change does not
2140 affect the current data. (Thanks to Andrew Main (Zefram) for
2141 suggestions that improved this change.)
2143 Where these two TZ changes take effect, there is a minor extension
2144 to the tz file format in that it allows new values for the
2145 embedded TZ-format string, and the tz file format version number
2146 has therefore been increased from 2 to 3 as a precaution.
2147 Version-2-based client code should continue to work as before for
2148 all timestamps before 2038. Existing version-2-based client code
2149 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2150 files, and typically works in practice even for timestamps after
2151 2037; the only known exception is America/Godthab.
2153 Changes affecting timestamps before 1970
2155 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2156 some errors before 1947.
2158 Some zones have been turned into links, when they differ from existing
2159 zones only in older data entries that were likely invented or that
2160 differ only in LMT or transitions from LMT. These changes affect
2161 only timestamps before 1943. The affected zones are:
2162 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2163 America/Grenada, America/Guadeloupe, America/Marigot,
2164 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2165 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2166 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2167 confirming that the old Europe/Vaduz zone was wrong and the new
2168 link is better for WWII-era times.)
2170 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2171 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2174 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2175 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2178 Change the date of the circa-1850 Zurich transition from 1849-09-12
2179 to 1853-07-16, overriding Shanks with data from Messerli about
2180 postal and telegraph time in Switzerland.
2182 Changes affecting time zone abbreviations before 1970
2184 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2185 as Jakarta was called Batavia back then.
2187 Changes affecting API
2189 The 'zic' command now outputs a dummy transition when far-future
2190 data can't be summarized using a TZ string, and uses a 402-year
2191 window rather than a 400-year window. For the current data, this
2192 affects only the Asia/Tehran file. It does not affect any of the
2193 timestamps that this file represents, so zdump outputs the same
2194 information as before. (Thanks to Andrew Main (Zefram).)
2196 The 'date' command has a new '-r' option, which lets you specify
2197 the integer time to display, a la FreeBSD.
2199 The 'tzselect' command has two new options '-c' and '-n', which lets you
2200 select a zone based on latitude and longitude.
2202 The 'zic' command's '-v' option now warns about constructs that
2203 require the new version-3 binary file format. (Thanks to Arthur
2204 David Olson for the suggestion.)
2206 Support for floating-point time_t has been removed.
2207 It was always dicey, and POSIX no longer requires it.
2208 (Thanks to Eric Blake for suggesting to the POSIX committee to
2209 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2210 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2211 bugs and elucidating some of the corners of the old floating-point
2214 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2215 changed back to the old practice of using 'long' to represent UT
2216 offsets. This had been inadvertently and mistakenly changed to
2217 'int_fast32_t'. (Thanks to Christos Zoulas.)
2219 The code avoids undefined behavior on integer overflow in some
2220 more places, including gmtime, localtime, mktime and zdump.
2222 Changes affecting the zdump utility
2224 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2225 "UTC" does not make sense for timestamps that predate the introduction
2226 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2227 for clarifying UT vs UTC.)
2229 Data changes affecting behavior of tzselect and similar programs
2231 Country code BQ is now called the more-common name "Caribbean Netherlands"
2232 rather than the more-official "Bonaire, St Eustatius & Saba".
2234 Remove from zone.tab the names America/Montreal, America/Shiprock,
2235 and Antarctica/South_Pole, as they are equivalent to existing
2236 same-country-code zones for post-1970 timestamps. The data entries for
2237 these names are unchanged, so the names continue to work as before.
2239 Changes affecting code internals
2241 zic -c now runs way faster on 64-bit hosts when given large numbers.
2243 zic now uses vfprintf to avoid allocating and freeing some memory.
2245 tzselect now computes the list of continents from the data,
2246 rather than have it hard-coded.
2248 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2250 Changes affecting the build procedure
2252 The 'leapseconds' file is now generated automatically from a
2253 new file 'leap-seconds.list', which is a copy of
2254 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2255 A new source file 'leapseconds.awk' implements this.
2256 The goal is simplification of the future maintenance of 'leapseconds'.
2258 When building the 'posix' or 'right' subdirectories, if the
2259 subdirectory would be a copy of the default subdirectory, it is
2260 now made a symbolic link if that is supported. This saves about
2261 2 MB of file system space.
2263 The links America/Shiprock and Antarctica/South_Pole have been
2264 moved to the 'backward' file. This affects only nondefault builds
2265 that omit 'backward'.
2267 Changes affecting version-control only
2269 .gitignore now ignores 'date'.
2271 Changes affecting documentation and commentary
2273 Changes to the 'tzfile' man page
2275 It now mentions that the binary file format may be extended in
2276 future versions by appending data.
2278 It now refers to the 'zdump' and 'zic' man pages.
2280 Changes to the 'zic' man page
2282 It lists conditions that elicit a warning with '-v'.
2284 It says that the behavior is unspecified when duplicate names
2285 are given, or if the source of one link is the target of another.
2287 Its examples are updated to match the latest data.
2289 The definition of white space has been clarified slightly.
2290 (Thanks to Michael Deckers.)
2292 Changes to the 'Theory' file
2294 There is a new section about the accuracy of the tz database,
2295 describing the many ways that errors can creep in, and
2296 explaining why so many of the pre-1970 timestamps are wrong or
2297 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2298 Wollman for discussions that contributed to this).
2300 The 'Theory' file describes LMT better (this follows a
2301 suggestion by Guy Harris).
2303 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2305 It's mentioned that excluding 'backward' should not affect the
2306 other data, and it suggests at least one zone.tab name per
2307 inhabited country (thanks to Stephen Colebourne).
2309 Some longstanding restrictions on names are documented, e.g.,
2310 'America/New_York' precludes 'America/New_York/Bronx'.
2312 It gives more reasons for the 1970 cutoff.
2314 It now mentions which time_t variants are supported, such as
2315 signed integer time_t. (Thanks to Paul Goyette for reporting
2316 typos in an experimental version of this change.)
2318 (Thanks to Philip Newton for correcting typos in these changes.)
2320 Documentation and commentary is more careful to distinguish UT in
2321 general from UTC in particular. (Thanks to Steve Allen.)
2323 Add a better source for the Zurich 1894 transition.
2324 (Thanks to Pierre-Yves Berger.)
2326 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2329 Release 2013d - 2013-07-05 07:38:01 -0700
2331 Changes affecting future timestamps:
2333 Morocco's midsummer transitions this year are July 7 and August 10,
2334 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2336 Israel now falls back on the last Sunday of October.
2337 (Thanks to Ephraim Silverberg.)
2339 Changes affecting past timestamps:
2341 Specify Jerusalem's location more precisely; this changes the pre-1880
2344 Changing affecting metadata only:
2346 Fix typos in the entries for country codes BQ and SX.
2348 Changes affecting code:
2350 Rework the code to fix a bug with handling Australia/Macquarie on
2351 32-bit hosts (thanks to Arthur David Olson).
2353 Port to platforms like NetBSD, where time_t can be wider than long.
2355 Add support for testing time_t types other than the system's.
2356 Run 'make check_time_t_alternatives' to try this out.
2357 Currently, the tests fail for unsigned time_t;
2358 this should get fixed at some point.
2360 Changes affecting documentation and commentary:
2362 Deemphasize the significance of national borders.
2364 Update the zdump man page.
2366 Remove obsolete NOID comment (thanks to Denis Excoffier).
2368 Update several URLs and comments in the web pages.
2370 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2372 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2375 Release 2013c - 2013-04-19 16:17:40 -0700
2377 Changes affecting current and future timestamps:
2379 Palestine observed DST starting March 29, 2013. (Thanks to
2380 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2381 with the predicted rules being the last Thursday in March at 24:00
2382 to the first Friday on or after September 21 at 01:00.
2384 Assume that the recent change to Paraguay's DST rules is permanent,
2385 by moving the end of DST to the 4th Sunday in March every year.
2386 (Thanks to Carlos Raúl Perasso.)
2388 Changes affecting past timestamps:
2390 Fix some historical data for Palestine to agree with that of
2391 timeanddate.com, as follows:
2393 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2396 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2399 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2401 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2403 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2405 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2407 Fix times of habitation for Macquarie to agree with the Tasmania
2408 Parks & Wildlife Service history, which indicates that permanent
2409 habitation was 1899-1919 and 1948 on.
2411 Changing affecting metadata only:
2413 Macquarie Island is politically part of Australia, not Antarctica.
2414 (Thanks to Tobias Conradi.)
2416 Sort Macquarie more-consistently with other parts of Australia.
2417 (Thanks to Tim Parenti.)
2420 Release 2013b - 2013-03-10 22:33:40 -0700
2422 Changes affecting current and future timestamps:
2424 Haiti uses US daylight-saving rules this year, and presumably future years.
2425 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2427 Paraguay will end DST on March 24 this year.
2428 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2430 Morocco does not observe DST during Ramadan;
2431 try to predict Ramadan in Morocco as best we can.
2432 (Thanks to Erik Homoet for the heads-up.)
2434 Changes affecting commentary:
2436 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2437 Update URL for Solaris. Mention Internet RFC 6557.
2438 Update Internet RFCs 2445->5545, 2822->5322.
2439 Switch from FTP to HTTP for Internet RFCs.
2442 Release 2013a - 2013-02-27 09:20:35 -0800
2444 Change affecting binary data format:
2446 The zone offset at the end of version-2-format zone files is now
2447 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2449 Changes affecting current and future timestamps:
2451 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2452 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2453 (Thanks to Steffen Thorsen and Robert Elz.)
2455 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2456 (Thanks to Tobias Conradi and Arthur David Olson.)
2458 Many changes affect historical timestamps before 1940.
2459 These were deduced from: Milne J. Civil time. Geogr J. 1899
2460 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2462 Changes affecting the code:
2464 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2465 the data). (Thanks to Arthur David Olson.)
2467 Fix localtime bug when time_t is unsigned and data files were generated
2468 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2469 to Arthur David Olson for fixing.)
2471 Allow the email address for bug reports to be set by the packager.
2472 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2474 Update HTML checking to be compatible with Ubuntu 12.10.
2476 Check that files are a safe subset of ASCII. At some point we may
2477 relax this requirement to a safe subset of UTF-8. Without the
2478 check, some non-UTF-8 encodings were leaking into the distribution.
2482 Restore a comment about copyright notices that was inadvertently deleted.
2483 (Thanks to Arthur David Olson.)
2485 Improve the commentary about which districts observe what times
2486 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2488 Add web page links to tz.js.
2490 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2493 Release 2012j - 2012-11-12 18:34:49 -0800
2495 Libya moved to CET this weekend, but with DST planned next year.
2496 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2498 Signatures now have the extension .asc, not .sign, as that's more
2499 standard. (Thanks to Phil Pennock.)
2501 The output of 'zdump --version', and of 'zic --version', now
2502 uses a format that is more typical for --version.
2503 (Thanks to Joseph S. Myers.)
2505 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2506 now uses tz@iana.org rather than the old elsie address.
2508 zic -v now complains about abbreviations that are less than 3
2509 or more than 6 characters, as per Posix. Formerly, it checked
2510 for abbreviations that were more than 3.
2512 'make public' no longer puts its temporary directory under /tmp,
2513 and uses the just-built zic rather than the system zic.
2515 Various fixes to documentation and commentary.
2518 Release 2012i - 2012-11-03 12:57:09 -0700
2520 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2522 Linker flags can now be specified via LDFLAGS.
2523 AWK now defaults to 'awk', not 'nawk'.
2524 The shell in tzselect now defaults to /bin/bash, but this can
2525 be overridden by specifying KSHELL.
2526 The main web page now mentions the unofficial GitHub repository.
2527 (Thanks to Mike Frysinger.)
2529 Tarball signatures can now be built by running 'make signatures'.
2530 There are also new makefile rules 'tarballs', 'check_public', and
2531 separate makefile rules for each tarball and signature file.
2532 A few makefile rules are now more portable to strict POSIX.
2534 The main web page now lists the canonical IANA URL.
2537 Release 2012h - 2012-10-26 22:49:10 -0700
2539 Bahia no longer has DST. (Thanks to Kelley Cook.)
2541 Tocantins has DST. (Thanks to Rodrigo Severo.)
2543 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2545 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2549 More C modernization, except that at Arthur David Olson's suggestion
2550 the instances of 'register' were kept.
2553 Release 2012g - 2012-10-17 20:59:45 -0700
2555 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2557 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2561 To attack the version-number problem, this release ships the file
2562 'Makefile' (which contains the release number) in both the tzcode and
2563 the tzdata tarballs. The two Makefiles are identical, and should be
2564 identical in any matching pair of tarballs, so it shouldn't matter
2565 which order you extract the tarballs. Perhaps we can come up with a
2566 better version-number scheme at some point; this scheme does have the
2567 virtue of not adding more files.
2570 Release 2012f - 2012-09-12 23:17:03 -0700
2572 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2573 20 this year. (Thanks to Steffen Thorsen.)
2576 Release 2012e - 2012-08-02 20:44:55 -0700
2578 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2579 (Thanks to Steffen Thorsen.)
2581 * Use a single version number for both code and data.
2583 * .gitignore: New file.
2585 * Remove trailing white space.
2588 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2590 Changes for Morocco's timestamps, which take effect in a couple of
2591 hours, along with infrastructure changes to accommodate how the tz
2592 code and data are released on IANA.
2595 Release data2012c - 2012-03-27 12:17:25 -0400
2598 Summer time changes for Morocco (to start late April 2012)
2601 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2604 Haiti following US/Canada rules for 2012 (and we're assuming,
2605 for now anyway, for the future).
2608 Release 2012b - 2012-03-02 12:29:15 +0700
2610 There is just one change to tzcode2012b (compared with 2012a):
2611 the Makefile that was accidentally included with 2012a has been
2612 replaced with the version that should have been there, which is
2613 identical with the previous version (from tzcode2011i).
2615 There are just two changes in tzdata2012b compared with 2012a.
2617 Most significantly, summer time in Cuba has been delayed 3 weeks
2618 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2619 date, as listed in 2012a) is just a little over a week away, this
2622 Less importantly, an excess tab in one of the changes in zone.tab
2623 in 2012a has been removed.
2626 Release 2012a - 2012-03-01 18:28:10 +0700
2628 The changes in tzcode2012a (compared to the previous version, 2011i)
2629 are entirely to the README and tz-art.htm and tz-link.htm files, if
2630 none of those concern you, you can ignore the code update. The changes
2631 reflect the changed addresses for the mailing list and the code and
2632 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2633 has been added to tz-link.htm).
2635 In tzdata2012a (compared to the previous release, which was 2011n)
2636 the major changes are:
2637 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2638 Falkland Islands onto permanent summer time (we're assuming for the
2639 foreseeable future, though 2012 is all we're fairly certain of.)
2640 Armenia has abolished Summer Time.
2641 Tokelau jumped the International Date Line back last December
2642 (just the same as their near neighbour, Samoa).
2643 America/Creston is a new zone for a small area of British Columbia
2644 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2646 Other minor changes are:
2647 Corrections to 1918 Canadian summer time end dates.
2648 Updated URL for UK time zone history (in comments)
2649 A few typos in Le Corre's list of free French place names (comments)
2652 Release data2011n - 2011-10-30 14:57:54 +0700
2654 There are three changes of note - most urgently, Cuba (America/Havana)
2655 has extended summer time by two weeks, now to end on Nov 13, rather than
2656 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2657 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2658 all, and consequently that zone has been removed (again) and reinstated
2659 in the "backward" file as a link to Europe/Chisinau. And third, the
2660 end date for Fiji's summer time this summer was moved forward from the
2661 earlier planned Feb 26, to Jan 22.
2663 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2664 (and the incorrect syntax that was in the 2011m version of that file
2665 is so fixed - it would have been fixed in a different way had this
2666 change not happened - that's the "missing" sccs version id).
2669 Release data2011m - 2011-10-24 21:42:16 +0700
2671 In particular, the typos in comments in the data (2011-11-17 should have
2672 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2673 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2674 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2675 Tim Parenti, and also Denys Gavrysh)
2677 In addition, I added Europe/Tiraspol to zone.tab.
2679 This time, all the files have new version numbers... (including the files
2680 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2681 version numbers there...)
2684 Release data2011l - 2011-10-10 11:15:43 +0700
2686 There are just 2 changes that cause different generated tzdata files from
2687 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2688 is included, but commented out. Compared with the diff I sent out last week,
2689 this version also includes attributions for the sources for the changes
2690 (in much the same format as ado used, but the html tags have not been
2691 checked, verified, or used in any way at all, so if there are errors there,
2692 please let me know.)
2695 Release data2011k - 2011-09-20 17:54:03 -0400
2700 Release data2011j - 2011-09-12 09:22:49 -0400
2702 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2703 Tanzania); there are also two spelling corrections to comments in
2704 the australasia file (with thanks to Christos Zoulas).
2707 Release 2011i - 2011-08-29 05:56:32 -0400
2712 Release data2011h - 2011-06-15 18:41:48 -0400
2714 Russia and Curaçao changes
2717 Release 2011g - 2011-04-25 09:07:22 -0400
2719 update the rules for Egypt to reflect its abandonment of DST this year
2722 Release 2011f - 2011-04-06 17:14:53 -0400
2727 Release 2011e - 2011-03-31 16:04:38 -0400
2729 Morocco, Chile, and tz-link changes
2732 Release 2011d - 2011-03-14 09:18:01 -0400
2734 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2737 Release 2011c - 2011-03-07 09:30:09 -0500
2739 These do affect current timestamps in Chile and Annette Island, Canada.
2742 Release 2011b - 2011-02-07 08:44:50 -0500
2747 Release 2011a - 2011-01-24 10:30:16 -0500
2752 Release data2010o - 2010-11-01 09:18:23 -0400
2754 change to the end of DST in Fiji in 2011
2757 Release 2010n - 2010-10-25 08:19:17 -0400
2762 Release 2010m - 2010-09-27 09:24:48 -0400
2764 Hong Kong, Vostok, and zic.c changes
2767 Release 2010l - 2010-08-16 06:57:25 -0400
2772 Release 2010k - 2010-07-26 10:42:27 -0400
2777 Release 2010j - 2010-05-10 09:07:48 -0400
2779 changes for Bahía de Banderas and for version naming
2782 Release data2010i - 2010-04-16 18:50:45 -0400
2784 the end of DST in Morocco on 2010-08-08
2787 Release data2010h - 2010-04-05 09:58:56 -0400
2792 Release data2010g - 2010-03-24 11:14:53 -0400
2797 Release 2010f - 2010-03-22 09:45:46 -0400
2802 Release data2010e - 2010-03-08 14:24:27 -0500
2804 corrects the Dhaka bug found by Danvin Ruangchan
2807 Release data2010d - 2010-03-06 07:26:01 -0500
2812 Release 2010c - 2010-03-01 09:20:58 -0500
2814 changes including KRE's suggestion for earlier initialization of
2815 "goahead" and "goback" structure elements
2818 Release code2010a - 2010-02-16 10:40:04 -0500
2823 Release data2010b - 2010-01-20 12:37:01 -0500
2828 Release data2010a - 2010-01-18 08:30:04 -0500
2833 Release data2009u - 2009-12-26 08:32:28 -0500
2835 changes to DST in Bangladesh
2838 Release 2009t - 2009-12-21 13:24:27 -0500
2843 Release data2009s - 2009-11-14 10:26:32 -0500
2845 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2848 Release 2009r - 2009-11-09 10:10:31 -0500
2850 "antarctica" and "tz-link.htm" changes
2853 Release 2009q - 2009-11-02 09:12:40 -0500
2855 with two corrections as reported by Eric Muller and Philip Newton
2858 Release data2009p - 2009-10-23 15:05:27 -0400
2860 Argentina (including San Luis) changes (with the correction from
2864 Release data2009o - 2009-10-14 16:49:38 -0400
2866 Samoa (commentary only), Pakistan, and Bangladesh changes
2869 Release data2009n - 2009-09-22 15:13:38 -0400
2871 added commentary for Argentina and a change to the end of DST in
2875 Release data2009m - 2009-09-03 10:23:43 -0400
2877 Samoa and Palestine changes
2880 Release data2009l - 2009-08-14 09:13:07 -0400
2882 Samoa (comments only) and Egypt
2885 Release 2009k - 2009-07-20 09:46:08 -0400
2890 Release data2009j - 2009-06-15 06:43:59 -0400
2892 Bangladesh change (with a short turnaround since the DST change is
2896 Release 2009i - 2009-06-08 09:21:22 -0400
2898 updating for DST in Bangladesh this year
2901 Release 2009h - 2009-05-26 09:19:14 -0400
2906 Release data2009g - 2009-04-20 16:34:07 -0400
2911 Release data2009f - 2009-04-10 11:00:52 -0400
2913 correct DST in Pakistan
2916 Release 2009e - 2009-04-06 09:08:11 -0400
2921 Release 2009d - 2009-03-23 09:38:12 -0400
2923 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2926 Release data2009c - 2009-03-16 09:47:51 -0400
2928 change to the start of Cuban DST
2931 Release 2009b - 2009-02-09 11:15:22 -0500
2936 Release 2009a - 2009-01-21 10:09:39 -0500
2941 Release data2008i - 2008-10-21 12:10:25 -0400
2943 southamerica and zone.tab files, with Argentina DST rule changes and
2944 United States zone reordering and recommenting
2947 Release 2008h - 2008-10-13 07:33:56 -0400
2952 Release 2008g - 2008-10-06 09:03:18 -0400
2954 Fix a broken HTML anchor and update Brazil's DST transitions;
2955 there's also a slight reordering of information in tz-art.htm.
2958 Release data2008f - 2008-09-09 22:33:26 -0400
2963 Release 2008e - 2008-07-28 14:11:17 -0400
2965 changes by Arthur David Olson and Jesper Nørgaard Welen
2968 Release data2008d - 2008-07-07 09:51:38 -0400
2970 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2973 Release data2008c - 2008-05-19 17:48:03 -0400
2975 Pakistan, Morocco, and Mongolia
2978 Release data2008b - 2008-03-24 08:30:59 -0400
2980 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2984 Release 2008a - 2008-03-08 05:42:16 -0500
2989 Release 2007k - 2007-12-31 10:25:22 -0500
2991 most importantly, changes to the "southamerica" file based on
2992 Argentina's readoption of daylight saving time
2995 Release 2007j - 2007-12-03 09:51:01 -0500
2997 1. eliminate the "P" (parameter) macro;
2999 2. the "noncontroversial" changes circulated on the time zone
3000 mailing list (less the changes to "logwtmp.c");
3002 3. eliminate "too many transition" errors when "min" is used in time
3005 4. changes by Paul Eggert (including updated information for Venezuela).
3008 Release data2007i - 2007-10-30 10:28:11 -0400
3010 changes for Cuba and Syria
3013 Release 2007h - 2007-10-01 10:05:51 -0400
3015 changes by Paul Eggert, as well as an updated link to the ICU
3016 project in tz-link.htm
3019 Release 2007g - 2007-08-20 10:47:59 -0400
3021 changes by Paul Eggert
3023 The "leapseconds" file has been updated to incorporate the most
3024 recent International Earth Rotation and Reference Systems Service
3027 There's an addition to tz-art.htm regarding the television show "Medium".
3030 Release 2007f - 2007-05-07 10:46:46 -0400
3032 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3035 changes to zic.c to allow hour values greater than 24 (along with
3036 Paul's improved time value overflow checking)
3039 Release 2007e - 2007-04-02 10:11:52 -0400
3041 Syria and Honduras changes by Paul Eggert
3043 zic.c variable renaming changes by Arthur David Olson
3046 Release 2007d - 2007-03-20 08:48:30 -0400
3048 changes by Paul Eggert
3050 the elimination of white space at the ends of lines
3053 Release 2007c - 2007-02-26 09:09:37 -0500
3055 changes by Paul Eggert
3058 Release 2007b - 2007-02-12 09:34:20 -0500
3060 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3062 changes to the commentary in "leapseconds" reflecting the IERS
3063 announcement that there is to be no positive leap second at the end
3067 Release 2007a - 2007-01-08 12:28:29 -0500
3069 changes by Paul Eggert
3071 Derick Rethan's Asmara change
3073 Oscar van Vlijmen's Easter Island local mean time change
3075 symbolic link changes
3078 Release 2006p - 2006-11-27 08:54:27 -0500
3080 changes by Paul Eggert
3083 Release 2006o - 2006-11-06 09:18:07 -0500
3085 changes by Paul Eggert
3088 Release 2006n - 2006-10-10 11:32:06 -0400
3090 changes by Paul Eggert
3093 Release 2006m - 2006-10-02 15:32:35 -0400
3095 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3097 (minimalist) changes to zic.8 to clarify "until" information
3100 Release data2006l - 2006-09-18 12:58:11 -0400
3102 Paul's best-effort work on this coming weekend's Egypt time change
3105 Release 2006k - 2006-08-28 12:19:09 -0400
3107 changes by Paul Eggert
3110 Release 2006j - 2006-08-21 09:56:32 -0400
3112 changes by Paul Eggert
3115 Release code2006i - 2006-08-07 12:30:55 -0400
3119 Ken Pizzini's conversion script
3122 Release code2006h - 2006-07-24 09:19:37 -0400
3124 adds public domain notices to four files
3126 includes a fix for transition times being off by a second
3128 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3131 Release 2006g - 2006-05-08 17:18:09 -0400
3133 northamerica changes by Paul Eggert
3136 Release 2006f - 2006-05-01 11:46:00 -0400
3138 a missing version number problem is fixed (with thanks to Bradley
3139 White for catching the problem)
3142 Release 2006d - 2006-04-17 14:33:43 -0400
3144 changes by Paul Eggert
3146 added new items to tz-arts.htm that were found by Paul
3149 Release 2006c - 2006-04-03 10:09:32 -0400
3151 two sets of data changes by Paul Eggert
3153 a fencepost error fix in zic.c
3155 changes to zic.c and the "europe" file to minimize differences
3156 between output produced by the old 32-bit zic and the new 64-bit
3160 Release 2006b - 2006-02-20 10:08:18 -0500
3161 [tz32code2006b + tz64code2006b + tzdata2006b]
3165 All SCCS IDs were bumped to "8.1" for this release.
3168 Release 2006a - 2006-01-30 08:59:31 -0500
3170 changes by Paul Eggert (in particular, Indiana time zone moves)
3172 an addition to the zic manual page to describe how special-case
3173 transitions are handled
3176 Release 2005r - 2005-12-27 09:27:13 -0500
3178 Canadian changes by Paul Eggert
3180 They also add "<pre>" directives to time zone data files and reflect
3181 changes to warning message logic in "zdump.c" (but with calls to
3182 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3185 Release 2005q - 2005-12-13 09:17:09 -0500
3187 Nothing earth-shaking here:
3188 1. Electronic mail addresses have been removed.
3189 2. Casts of the return value of exit have been removed.
3190 3. Casts of the argument of is.* macros have been added.
3191 4. Indentation in one section of zic.c has been fixed.
3192 5. References to dead URLs in the data files have been dealt with.
3195 Release 2005p - 2005-12-05 10:30:53 -0500
3197 "systemv", "tz-link.htm", and "zdump.c" changes
3198 (less the casts of arguments to the is* macros)
3201 Release 2005o - 2005-11-28 10:55:26 -0500
3203 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3205 zdump.c lint fixes by Arthur David Olson
3208 Release 2005n - 2005-10-03 09:44:09 -0400
3210 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3214 Release 2005m - 2005-08-29 12:15:40 -0400
3216 changes by Paul Eggert (with a small tweak to the tz-art change)
3218 a declaration of an unused variable has been removed from zdump.c
3221 Release 2005l - 2005-08-22 12:06:39 -0400
3223 changes by Paul Eggert
3225 overflow/underflow checks by Arthur David Olson, minus changes to
3226 the "Theory" file about the pending addition of 64-bit data (I grow
3227 less confident of the changes being accepted with each passing day,
3228 and the changes no longer increase the data files nine-fold--there's
3229 less than a doubling in size by my local Sun's reckoning)
3232 Release 2005k - 2005-07-14 14:14:24 -0400
3234 The "leapseconds" file has been edited to reflect the recently
3235 announced leap second at the end of 2005.
3237 I've also deleted electronic mail addresses from the files as an
3241 Release 2005j - 2005-06-13 14:34:13 -0400
3243 These reflect changes to limit the length of time zone abbreviations
3244 and the characters used in those abbreviations.
3246 There are also changes to handle POSIX-style "quoted" time zone
3247 environment variables.
3249 The changes were circulated on the time zone mailing list; the only
3250 change since then was the removal of a couple of minimum-length of
3251 abbreviation checks.
3254 Release data2005i - 2005-04-21 15:04:16 -0400
3256 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3259 Release 2005h - 2005-04-04 11:24:47 -0400
3261 changes by Paul Eggert
3263 minor changes to Makefile and zdump.c to produce more useful output
3264 when doing a "make typecheck"
3267 Release 2005g - 2005-03-14 10:11:21 -0500
3269 changes by Paul Eggert (a change to current DST rules in Uruguay and
3270 an update to a link to time zone software)
3273 Release 2005f - 2005-03-01 08:45:32 -0500
3275 data and documentation changes by Paul Eggert
3278 Release 2005e - 2005-02-10 15:59:44 -0500
3283 Release code2005d - 2005-01-31 09:21:47 -0500
3285 make zic complain about links to links if the -v flag is used
3287 have "make public" do more code checking
3289 add an include to "localtime.c" for the benefit of gcc systems
3292 Release 2005c - 2005-01-17 18:36:29 -0500
3294 get better results when mktime runs on a system where time_t is double
3296 changes to the data files (most importantly to Paraguay)
3299 Release 2005b - 2005-01-10 09:19:54 -0500
3301 Get localtime and gmtime working on systems with exotic time_t types.
3303 Update the leap second commentary in the "leapseconds" file.
3306 Release 2005a - 2005-01-01 13:13:44 -0500
3311 Release code2004i - 2004-12-14 13:42:58 -0500
3313 Deal with systems where time_t is unsigned.
3316 Release code2004h - 2004-12-07 11:40:18 -0500
3318 64-bit-time_t changes
3321 Release 2004g - 2004-11-02 09:06:01 -0500
3323 update to Cuba (taking effect this weekend)
3325 other changes by Paul Eggert
3327 correction of the spelling of Oslo
3329 changed versions of difftime.c and private.h
3332 Release code2004f - 2004-10-21 10:25:22 -0400
3334 Cope with wide-ranging tm_year values.
3337 Release 2004e - 2004-10-11 14:47:21 -0400
3339 Brazil/Argentina/Israel changes by Paul Eggert
3341 changes to tz-link.htm by Paul
3343 one small fix to Makefile
3346 Release 2004d - 2004-09-22 08:27:29 -0400
3348 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3351 Release 2004c - 2004-08-11 12:06:26 -0400
3353 asctime-related changes
3355 (variants of) some of the documentation changes suggested by Paul Eggert
3358 Release 2004b - 2004-07-19 14:33:35 -0400
3360 data changes by Paul Eggert - most importantly, updates for Argentina
3363 Release 2004a - 2004-05-27 12:00:47 -0400
3365 changes by Paul Eggert
3367 Handle DST transitions that occur at the end of a month in some
3368 years but at the start of the following month in other years.
3370 Add a copy of the correspondence that's the basis for claims about
3371 DST in the Navajo Nation.
3374 Release 2003e - 2003-12-15 09:36:47 -0500
3376 changes by Arthur David Olson (primarily code changes)
3378 changes by Paul Eggert (primarily data changes)
3380 minor changes to "Makefile" and "northamerica" (in the latter case,
3381 optimization of the "Toronto" rules)
3384 Release 2003d - 2003-10-06 09:34:44 -0400
3386 changes by Paul Eggert
3389 Release 2003c - 2003-09-16 10:47:05 -0400
3391 Fix bad returns in zic.c's inleap function.
3392 Thanks to Bradley White for catching the problem!
3395 Release 2003b - 2003-09-16 07:13:44 -0400
3397 Add a "--version" option (and documentation) to the zic and zdump commands.
3399 changes to overflow/underflow checking in zic
3401 a localtime typo fix.
3403 Update the leapseconds and tz-art.htm files.
3406 Release 2003a - 2003-03-24 09:30:54 -0500
3408 changes by Paul Eggert
3410 a few additions and modifications to the tz-art.htm file
3413 Release 2002d - 2002-10-15 13:12:42 -0400
3415 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3417 There's also a new time zone quote in "tz-art.htm".
3420 Release 2002c - 2002-04-04 11:55:20 -0500
3422 changes by Paul Eggert
3424 Change zic.c to avoid creating symlinks to files that don't exist.
3427 Release 2002b - 2002-01-28 12:56:03 -0500
3429 [These change notes are for Release 2002a, which was corrupted.
3430 2002b was a corrected version of 2002a.]
3432 changes by Paul Eggert
3434 Update the "leapseconds" file to note that there'll be no leap
3435 second at the end of June, 2002.
3437 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3439 Change to "difftime.c" to avoid sizeof problems.
3442 Release 2001d - 2001-10-09 13:31:32 -0400
3444 changes by Paul Eggert
3447 Release 2001c - 2001-06-05 13:59:55 -0400
3449 changes by Paul Eggert and Andrew Brown
3452 Release 2001b - 2001-04-05 16:44:38 -0400
3454 changes by Paul Eggert (modulo jnorgard's typo fix)
3456 tz-art.htm has been HTMLified.
3459 Release 2001a - 2001-03-13 12:57:44 -0500
3461 changes by Paul Eggert
3463 An addition to the "leapseconds" file: comments with the text of the
3464 latest IERS leap second notice.
3466 Trailing white space has been removed from data file lines, and
3467 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3471 Release 2000h - 2000-12-14 15:33:38 -0500
3473 changes by Paul Eggert
3475 one typo fix in the "art" file
3477 With providence, this is the last update of the millennium.
3480 Release 2000g - 2000-10-10 11:35:22 -0400
3482 changes by Paul Eggert
3484 correction of John Mackin's name submitted by Robert Elz
3486 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3487 Emmy Awards broadcast.
3490 Release 2000f - 2000-08-10 09:31:58 -0400
3492 changes by Paul Eggert
3494 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3496 Error checking and messages in the "yearistype" script have been
3500 Release 2000e - 2000-07-31 09:27:54 -0400
3502 data changes by Paul Eggert
3504 a change to the default value of the defined constant HAVE_STRERROR
3506 the addition of a Dave Barry quote on DST to the tz-arts file
3509 Release 2000d - 2000-04-20 15:43:04 -0400
3511 changes to the documentation and code of strftime for C99 conformance
3513 a bug fix for date.c
3515 These are based on (though modified from) changes by Paul Eggert.
3518 Release 2000c - 2000-03-04 10:31:43 -0500
3520 changes by Paul Eggert
3523 Release 2000b - 2000-02-21 12:16:29 -0500
3525 changes by Paul Eggert and Joseph Myers
3527 modest tweaks to the tz-art.htm and tz-link.htm files
3530 Release 2000a - 2000-01-18 09:21:26 -0500
3532 changes by Paul Eggert
3534 The two hypertext documents have also been renamed.
3537 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3539 Paul Eggert's changes
3541 additions to the "zic" manual page and the "Arts.htm" file
3544 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3549 Release data1999h - 1999-10-07 03:50:29 -0400
3551 changes by Paul Eggert to "europe" (most importantly, fixing
3552 Lithuania and Estonia)
3555 Release 1999g - 1999-09-28 11:06:18 -0400
3557 data changes by Paul Eggert (most importantly, the change for
3558 Lebanon that buys correctness for this coming Sunday)
3560 The "code" file contains changes to "Makefile" and "checktab.awk" to
3561 allow better checking of time zone files before they are published.
3564 Release 1999f - 1999-09-23 09:48:14 -0400
3566 changes by Arthur David Olson and Paul Eggert
3569 Release 1999e - 1999-08-17 15:20:54 -0400
3571 changes circulated by Paul Eggert, although the change to handling
3572 of DST-specifying time zone names has been commented out for now
3573 (search for "XXX" in "localtime.c" for details). These files also
3574 do not make any changes to the start of DST in Brazil.
3576 In addition to Paul's changes, there are updates to "Arts.htm" and
3580 Release 1999d - 1999-03-30 11:31:07 -0500
3582 changes by Paul Eggert
3584 The Makefile's "make public" rule has also been changed to do a test
3585 compile of each individual time zone data file (which should help
3586 avoid problems such as the one we had with Nicosia).
3589 Release 1999c - 1999-03-25 09:47:47 -0500
3591 changes by Paul Eggert, most importantly the change for Chile.
3594 Release 1999b - 1999-02-01 17:51:44 -0500
3596 changes by Paul Eggert
3598 code changes (suggested by Mani Varadarajan, mani at be.com) for
3599 correct handling of symbolic links when building using a relative directory
3601 code changes to generate correct messages for failed links
3603 updates to the URLs in Arts.htm
3606 Release 1999a - 1999-01-19 16:20:29 -0500
3608 error message internationalizations and corrections in zic.c and
3609 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3613 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3615 changes for Brazil, Chile, and Germany
3617 support for use of "24:00" in the input files for the time zone compiler
3620 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3622 changes by Paul Eggert
3624 correction to a define in the "private.h" file
3627 Release data1998g - 1998-08-11 03:28:35 -0000
3628 [tzdata1998g.tar.gz is missing!]
3630 Lithuanian change provided by mgedmin at pub.osf.it
3632 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3633 "backward") to ensure that the GMT file is created even where folks
3634 don't want the "backward" links (as suggested by Paul Eggert).
3637 Release data1998f - 1998-07-20 13:50:00 -0000
3638 [tzdata1998f.tar.gz is missing!]
3640 Update the "leapseconds" file to include the newly-announced
3641 insertion at the end of 1998.
3644 Release code1998f - 1998-06-01 10:18:31 -0400
3646 addition to localtime.c by Guy Harris
3649 Release 1998e - 1998-05-28 09:56:26 -0400
3651 The Makefile is changed to produce zoneinfo-posix rather than
3652 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3655 data changes by Paul Eggert
3657 changes from Guy Harris to provide asctime_r and ctime_r
3659 A usno1998 file (substantially identical to usno1997) has been added.
3662 Release 1998d - 1998-05-14 11:58:34 -0400
3664 changes to comments (in particular, elimination of references to CIA maps).
3665 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3666 where changes occur.
3669 Release 1998c - 1998-02-28 12:32:26 -0500
3671 changes by Paul Eggert (save the "French correction," on which I'll
3672 wait for the dust to settle)
3676 changes and additions to Arts.htm
3679 Release 1998b - 1998-01-17 14:31:51 -0500
3681 URL cleanups and additions
3684 Release 1998a - 1998-01-13 12:37:35 -0500
3686 changes by Paul Eggert
3689 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3691 changes by Paul Eggert, with minor modifications from Arthur David
3692 Olson to make the files more browser friendly
3695 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3697 minor changes to put "TZif" at the start of each time zone information file
3699 a rule has also been added to the Makefile so you can
3701 to just recompile the zone information files (rather than doing a
3702 full "make install" with its other effects).
3705 Release data1997i - 1997-10-07 08:45:38 -0400
3707 changes to Africa by Paul Eggert
3710 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3712 corrections for Uruguay (and other locations)
3714 Arthur David Olson's simple-minded fix allowing mktime to both
3715 correctly handle leap seconds and correctly handle tm_sec values
3716 upon which arithmetic has been performed.
3719 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3721 Paul Eggert's updates
3723 a small change to a function prototype;
3725 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3726 include information on Around the World in Eighty Days.
3729 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3731 fixes to zic's error handling
3733 changes inspired by the item circulated on Slovenia
3735 The description of Web resources has been HTMLified for browsing
3738 A new piece of tz-related music has been added to the "Music" file.
3741 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3743 Paul Eggert's latest suggestions
3746 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3748 changes to "zic.c" to correct performance of the "-s" option
3750 a new file "usno1997"
3753 Release data1997c - 1997-03-04 09:58:18 -0500
3758 Release 1997b - 1997-02-27 18:34:19 -0500
3760 The data file incorporates the 1997 leap second.
3762 The code file incorporates Arthur David Olson's take on the
3763 zic/multiprocessor/directory-creation situation.
3766 Release 1997a - 1997-01-21 09:11:10 -0500
3768 Paul Eggert's Antarctica (and other changes)
3770 Arthur David Olson finessed the "getopt" issue by checking against
3771 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3772 is returned while SunOS 5.5's manual says EOF is returned).
3775 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3777 Paul Eggert's latest changes
3780 Release code1996n - 1996-12-16 09:42:02 -0500
3782 link snapping fix from Bruce Evans (via Garrett Wollman)
3785 Release data1996m - 1996-11-24 02:37:34 -0000
3786 [tzdata1996m.tar.gz is missing!]
3788 Paul Eggert's batch of changes
3791 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3793 No functional changes here; the files have simply been changed to
3794 make more use of ISO style dates in comments. The names of the above
3795 files now include the year in full.
3798 Release code96l - 1996-09-08 17:12:20 -0400
3800 tzcode96k was missing a couple of pieces.
3803 Release 96k - 1996-09-08 16:06:22 -0400
3805 the latest round of changes from Paul Eggert
3807 the recent Year 2000 material
3810 Release code96j - 1996-07-30 13:18:53 -0400
3812 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3815 Release code96i - 1996-07-27 20:11:35 -0400
3817 Paul's suggested patch for strftime %V week numbers
3820 Release data96i - 1996-07-01 18:13:04 -0400
3822 "northamerica" and "europe" changes by Paul Eggert
3825 Release code96h - 1996-06-05 08:02:21 -0400
3827 fix for handling transitions specified in Universal Time
3829 Some "public domain" notices have also been added.
3832 Release code96g - 1996-05-16 14:00:26 -0400
3834 fix for the simultaneous-DST-and-zone-change challenge
3837 Release data96h - 1996-05-09 17:40:51 -0400
3839 changes by Paul Eggert
3842 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3843 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3845 The changes get us some of the way to fixing the problems noted in Paul
3846 Eggert's letter yesterday (in addition to a few others). The approach
3847 has been to make zic a bit smarter about figuring out what time zone
3848 abbreviations apply just after the time specified in the "UNTIL" part
3849 of a zone line. Putting the smarts in zic means avoiding having
3850 transition times show up in both "Zone" lines and "Rule" lines, which
3851 in turn avoids multiple transition time entries in time zone files.
3852 (This also makes the zic input files such as "europe" a bit shorter and
3853 should ease maintenance.)
3856 Release data96f - 1996-04-19 19:20:03 -0000
3857 [tzdata96f.tar.gz is missing!]
3859 The only changes are to the "northamerica" file; the time zone
3860 abbreviation for Denver is corrected to MST (and MDT), and the
3861 comments for Mexico have been updated.
3864 Release data96e - 1996-03-19 17:37:26 -0500
3866 Proposals by Paul Eggert, in particular the Portugal change that
3867 comes into play at the end of this month.
3870 Release data96d - 1996-03-18 20:49:39 -0500
3875 Release code96e - 1996-02-29 15:43:27 -0000
3876 [tzcode96e.tar.gz is missing!]
3878 internationalization changes and the fix to the documentation for strftime
3881 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3883 The "code" file simply updates Bob Kridle's electronic address.
3885 The "data" file updates rules for Mexico.
3888 Release data96b - 1996-01-27 15:44:42 -0500
3893 Release code96c - 1996-01-16 16:58:15 -0500
3895 leap-year streamlining and binary-search changes
3900 Release code96b - 1996-01-10 20:42:39 -0500
3902 fixes and enhancements from Paul Eggert, including code that
3903 emulates the behavior of recent versions of the SunOS "date"
3907 Release 96a - 1996-01-06 09:08:24 -0500
3911 fixes to strftime.c for correct ISO 8601 week number generation,
3912 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3913 numbers (which are not necessarily the same as calendar year numbers)
3916 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3918 The latest revisions from Paul Eggert are included, the usno1995
3919 file has been updated, and a new file ("WWW") covering useful URLs
3923 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3925 A simplification of a macro definition, a change to data for Sudan,
3926 and (for last minute shoppers) notes in the "Music" file on the CD
3930 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3932 (slightly reformatted) 8-bit-clean proposed patch
3934 minor patch: US/Eastern -> America/New_York
3936 snapshot of the USNO's latest data ("usno1995")
3938 some other minor cleanups
3941 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3942 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3946 support for 64-bit time_t's
3948 optimization in localtime.c
3951 Release code95e - 1995-10-13 13:23:57 -0400
3953 the mktime change to scan from future to past when trying to find time zone
3957 Release data95i - 1995-09-26 10:43:26 -0400
3959 For Canada/Central, guess that the Sun customer's "one week too
3960 early" was just a approximation, and the true error is one month
3961 too early. This is consistent with the rest of Canada.
3964 Release data95h - 1995-09-21 11:26:48 -0400
3966 latest changes from Paul Eggert
3969 Release code95d - 1995-09-14 11:14:45 -0400
3971 the addition of a "Music" file, which documents four recorded
3972 versions of the tune "Save That Time".
3975 Release data95g - 1995-09-01 17:21:36 -0400
3977 "yearistype" correction
3980 Release data95f - 1995-08-28 20:46:56 -0400
3982 Paul Eggert's change to the australasia file
3985 Release data95e - 1995-07-08 18:02:34 -0400
3987 The only change is a leap second at the end of this year.
3988 Thanks to Bradley White for forwarding news on the leap second.
3991 Release data95d - 1995-07-03 13:26:22 -0400
3993 Paul Eggert's changes
3996 Release data95c - 1995-07-02 19:19:28 -0400
3998 changes to "asia", "backward", "europe", and "southamerica"
3999 (read: northamericacentrics need not apply)
4002 Release code95c - 1995-03-13 14:00:46 -0500
4004 one-line fix for sign extension problems in detzcode
4007 Release 95b - 1995-03-04 11:22:38 -0500
4009 Minor changes in both:
4011 The "code" file contains a workaround for the lack of "unistd.h" in
4012 Microsoft C++ version 7.
4014 The "data" file contains a fixed "Link" for America/Shiprock.
4017 Release 94h - 1994-12-10 12:51:14 -0500
4021 * incorporate the changes to "zdump" and "date" to make changes to
4022 the "TZ" environment variable permanent;
4024 * incorporate the table changes by Paul Eggert;
4026 * include (and document) support for universal time specifications in
4027 data files - but do not (yet) include use of this feature in the
4030 Think of this as "TZ Classic" - the software has been set up not to break if
4031 universal time shows up in its input, and data entries have been
4032 left as is so as not to break existing implementations.
4035 Release data94f - 1994-08-20 12:56:09 -0400
4037 (with thanks!) the latest data updates from Paul Eggert
4040 Release data94e - 1994-06-04 13:13:53 -0400
4045 Release code94g - 1994-05-05 12:14:07 -0400
4047 fix missing "optind.c" and a reference to it in the Makefile
4050 Release code94f - 1994-05-05 13:00:33 -0000
4051 [tzcode94f.tar.gz is missing!]
4053 changes to avoid overflow in difftime, as well as changes to cope
4054 with the 52/53 challenge in strftime
4057 Release code94e - 1994-03-30 23:32:59 -0500
4059 change for the benefit of PCTS
4062 Release 94d - 1994-02-24 15:42:25 -0500
4064 Avoid clashes with POSIX semantics for zones such as GMT+4.
4066 Some other very minor housekeeping is also present.
4069 Release code94c - 1994-02-10 08:52:40 -0500
4071 Fix bug where mkdirs was broken unless you compile with
4072 -fwritable-strings (which is generally losing to do).
4075 Release 94b - 1994-02-07 10:04:33 -0500
4077 work by Paul Eggert who notes:
4079 I found another book of time zone histories by E W Whitman; it's not
4080 as extensive as Shanks but has a few goodies of its own. I used it
4081 to update the tables. I also fixed some more as a result of
4082 correspondence with Adam David and Peter Ilieve, and move some stray
4083 links from 'europe' to 'backward'. I corrected some scanning errors
4086 As far as the code goes, I fixed zic to allow years in the range
4087 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4088 And I cleaned up the zic documentation a little bit.
4091 Release data94a - 1994-02-03 08:58:54 -0500
4093 It simply incorporates the recently announced leap second into the
4097 Release 93g - 1993-11-22 17:28:27 -0500
4099 Paul Eggert has provided a good deal of historic information (based
4100 on Shanks), and there are some code changes to deal with the buglets
4101 that crawled out in dealing with the new information.
4104 Release 93f - 1993-10-15 12:27:46 -0400
4106 Paul Eggert's changes
4109 Release 93e - 1993-09-05 21:21:44 -0400
4111 This has updated data for Israel, England, and Kwajalein. There's
4112 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4113 Thanks to Paul Eggert and Peter Ilieve for the changes.
4116 Release 93d - 1993-06-17 23:34:17 -0400
4118 new fix and new data on Israel
4121 Release 93c - 1993-06-06 19:31:55 -0400
4126 Release 93b - 1993-02-02 14:53:58 -0500
4128 updated "leapseconds" file
4131 Release 93 - 1993-01-08 07:01:06 -0500
4133 At kre's suggestion, the package has been split in two - a code piece
4134 (which also includes documentation) that's only of use to folks who
4135 want to recompile things and a data piece useful to anyone who can
4138 The new version has a few changes to the data files, a few
4139 portability changes, and an off-by-one fix (with thanks to
4140 Tom Karzes at deshaw.com for providing a description and a
4144 Release 92c - 1992-11-21 17:35:36 -0000
4145 [tz92c.tar.Z is missing!]
4147 The fallout from the latest round of DST transitions.
4149 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4150 there's also a change to "zic.c" that makes it portable to more systems.
4153 Release 92 - 1992-04-25 18:17:03 -0000
4154 [tz92.tar.Z is missing!]
4156 By popular demand (well, at any rate, following a request by kre at munnari)
4159 The 1989 update of the time zone package featured:
4161 * POSIXization (including interpretation of POSIX-style TZ environment
4162 variables, provided by Guy Harris),
4163 * ANSIfication (including versions of "mktime" and "difftime"),
4164 * SVIDulation (an "altzone" variable)
4165 * MACHination (the "gtime" function)
4166 * corrections to some time zone data (including corrections to the rules
4167 for Great Britain and New Zealand)
4168 * reference data from the United States Naval Observatory for folks who
4169 want to do additional time zones
4170 * and the 1989 data for Saudi Arabia.
4172 (Since this code will be treated as "part of the implementation" in some
4173 places and as "part of the application" in others, there's no good way to
4174 name functions, such as timegm, that are not part of the proposed ANSI C
4175 standard; such functions have kept their old, underscore-free names in this
4178 And the "dysize" function has disappeared; it was present to allow
4179 compilation of the "date" command on old BSD systems, and a version of "date"
4180 is now provided in the package. The "date" command is not created when you
4181 "make all" since it may lack options provided by the version distributed with
4182 your operating system, or may not interact with the system in the same way
4183 the native version does.
4185 Since POSIX frowns on correct leap second handling, the default behavior of
4186 the "zic" command (in the absence of a "-L" option) has been changed to omit
4187 leap second information from its output files.
4193 This file contains copies of the part of each release announcement
4194 that talks about the changes in that release. The text has been
4195 adapted and reformatted for the purposes of this file.
4197 Traditionally a release R consists of a pair of tarball files,
4198 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4199 code2010a, data2012c) consist of just one or the other tarball, and a
4200 few (e.g., code2012c-data2012d) have tarballs with mixed version
4201 numbers. Recent releases also come in an experimental format
4202 consisting of a single tarball tzdb-R.tar.lz with extra data.
4204 Release timestamps are taken from the release's commit (for newer,
4205 Git-based releases), from the newest file in the tarball (for older
4206 releases, where this info is available) or from the email announcing
4207 the release (if all else fails; these are marked with a time zone of
4208 -0000 and an "is missing!" comment).
4210 Earlier versions of the code and data were not announced on the tz
4211 list and are not summarized here.
4213 This file is in the public domain.