1 News for the tz database
3 Release 2018f - 2018-10-18 00:14:18 -0700
6 Volgograd moves from +03 to +04 on 2018-10-28.
7 Fiji ends DST 2019-01-13, not 2019-01-20.
8 Most of Chile changes DST dates, effective 2019-04-06.
10 Changes to future timestamps
12 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
13 (Thanks to Alexander Fetisov and Stepan Golosunov.)
15 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
16 predicted. (Thanks to Raymond Kumar.) Adjust future predictions
19 Most of Chile will end DST on the first Saturday in April at 24:00 mainland
20 time, and resume DST on the first Saturday in September at 24:00 mainland
21 time. The changes are effective from 2019-04-06, and do not affect the
22 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa
23 and Tim Parenti.) Adjust future predictions accordingly.
25 Changes to past timestamps
27 The 2018-05-05 North Korea 30-minute time zone change took place
28 at 23:30 the previous day, not at 00:00 that day.
30 China's 1988 spring-forward transition was on April 17, not
31 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00.
34 Fix several issues for Macau before 1992. Macau's pre-1904 LMT
35 was off by 10 s. Macau switched to +08 in 1904 not 1912, and
36 temporarily switched to +09/+10 during World War II. Macau
37 observed DST in 1942/79, not 1961/80, and there were several
38 errors for transition times and dates. (Thanks to P Chan.)
40 The 1948-1951 fallback transitions in Japan were at 25:00 on
41 September's second Saturday, not at 24:00. (Thanks to Phake Nick.)
42 zic turns this into 01:00 on the day after September's second
43 Saturday, which is the best that POSIX or C platforms can do.
45 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
46 paper by Li Yu, replacing more-questionable data from Shanks.
48 Changes to time zone abbreviations
50 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.)
54 zic now always generates TZif files where time type 0 is used for
55 timestamps before the first transition. This simplifies the
56 reading of TZif files and should not affect behavior of existing
57 TZif readers because the same set of time types is used; only
58 their internal indexes may have changed. This affects only the
59 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
60 EET, which previously used nonzero types for these timestamps.
62 Because of the type 0 change, zic no longer outputs a dummy
63 transition at time -2**59 (before the Big Bang), as clients should
64 no longer need this to handle historical timestamps correctly.
65 This reverts a change introduced in 2013d and shrinks most TZif
68 zic now supports negative time-of-day in Rule and Leap lines, e.g.,
69 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
70 occurs at 18:00 on the Saturday before the last Sunday in April.
71 This behavior was documented in 2018a but the code did not
72 entirely match the documentation.
74 localtime.c no longer requires at least one time type in TZif
75 files that lack transitions or have a POSIX-style TZ string. This
76 future-proofs the code against possible future extensions to the
77 format that would allow TZif files with POSIX-style TZ strings and
78 without transitions or time types.
80 A read-access subscript error in localtime.c has been fixed.
81 It could occur only in TZif files with timecnt == 0, something that
82 does not happen in practice now but could happen in future versions.
84 localtime.c no longer ignores TZif POSIX-style TZ strings that
85 specify only standard time. Instead, these TZ strings now
86 override the default time type for timestamps after the last
87 transition (or for all time stamps if there are no transitions),
88 just as DST strings specifying DST have always done.
90 leapseconds.awk now outputs "#updated" and "#expires" comments,
91 and supports leap seconds at the ends of months other than June
92 and December. (Inspired by suggestions from Chris Woodbury.)
94 Changes to documentation
96 New restrictions: A Rule name must start with a character that
97 is neither an ASCII digit nor "-" nor "+", and an unquoted name
98 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
99 The latter restriction makes room for future extensions (a
100 possibility noted by Tom Lane).
102 tzfile.5 now documents what time types apply before the first and
103 after the last transition, if any.
105 Documentation now uses the spelling "timezone" for a TZ setting
106 that determines timestamp history, and "time zone" for a
107 geographic region currently sharing the same standard time.
109 The name "TZif" is now used for the tz binary data format.
111 tz-link.htm now mentions the A0 TimeZone Migration utilities.
112 (Thanks to Aldrin Martoq for the link.)
114 Changes to build procedure
116 New 'make' target 'rearguard_tarballs' to build the rearguard
117 tarball only. This is a convenience on platforms that lack lzip
118 if you want to build the rearguard tarball. (Problem reported by
121 tzdata.zi is now more stable from release to release. (Problem
122 noted by Tom Lane.) It is also a bit shorter.
124 tzdata.zi now can contain comment lines documenting configuration
125 information, such as which data format was selected, which input
126 files were used, and how leap seconds are treated. (Problems
127 noted by Lester Caine and Brian Inglis.) If the Makefile defaults
128 are used these comment lines are absent, for backward
129 compatibility. A redistributor intending to alter its copy of the
130 files should also append "-LABEL" to the 'version' file's first
131 line, where "LABEL" identifies the redistributor's change.
134 Release 2018e - 2018-05-01 23:42:51 -0700
138 North Korea switches back to +09 on 2018-05-05.
139 The main format uses negative DST again, for Ireland etc.
140 'make tarballs' now also builds a rearguard tarball.
141 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
143 Changes to past and future timestamps
145 North Korea switches back from +0830 to +09 on 2018-05-05.
146 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
149 Bring back the negative-DST changes of 2018a, except be more
150 compatible with data parsers that do not support negative DST.
151 Also, this now affects historical timestamps in Namibia and the
152 former Czechoslovakia, not just Ireland. The main format now uses
153 negative DST to model timestamps in Europe/Dublin (from 1971 on),
154 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
155 does not affect UT offsets, only time zone abbreviations and the
156 tm_isdst flag. Also, this does not affect rearguard or vanguard
157 formats; effectively the main format now uses vanguard instead of
158 rearguard format. Data parsers that do not support negative DST
159 can still use data from the rearguard tarball described below.
161 Changes to build procedure
163 The command 'make tarballs' now also builds the tarball
164 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
165 except that it uses rearguard format intended for trailing-edge
168 Changes to data format and to code
170 The SAVE column of Rule and Zone lines can now have an 's' or 'd'
171 suffix, which specifies whether the adjusted time is standard time
172 or daylight saving time. If no suffix is given, daylight saving
173 time is used if and only if the SAVE column is nonzero; this is
174 the longstanding behavior. Although this new feature is not used
175 in tzdata, it could be used to specify the legal time in Namibia
176 1994-2017, as opposed to the popular time (see below).
178 Changes to past timestamps
180 From 1994 through 2017 Namibia observed DST in winter, not summer.
181 That is, it used negative DST, as Ireland still does. This change
182 does not affect UTC offsets; it affects only the tm_isdst flag and
183 the abbreviation used during summer, which is now CAT, not WAST.
184 Although (as noted by Michael Deckers) summer and winter time were
185 both simply called "standard time" in Namibian law, in common
186 practice winter time was considered to be DST (as noted by Stephen
187 Colebourne). The full effect of this change is only in vanguard
188 and main format; in rearguard format, the tm_isdst flag is still
189 zero in winter and nonzero in summer.
191 In 1946/7 Czechoslovakia also observed negative DST in winter.
192 The full effect of this change is only in vanguard and main
193 formats; in rearguard format, it is modeled as plain GMT without
194 daylight saving. Also, the dates of some 1944/5 DST transitions
195 in Czechoslovakia have been changed.
198 Release 2018d - 2018-03-22 07:05:46 -0700
202 Palestine starts DST a week earlier in 2018.
203 Add support for vanguard and rearguard data consumers.
204 Add subsecond precision to source data format, though not to data.
206 Changes to future timestamps
208 In 2018, Palestine starts DST on March 24, not March 31.
209 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
211 Changes to past and future timestamps
213 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
214 at 04:00. (Thanks to Steffen Thorsen.)
216 Changes to past timestamps
218 Historical transitions for Uruguay, represented by
219 America/Montevideo, have been updated per official legal documents,
220 replacing previous data mainly originating from the inventions of
221 Shanks & Pottenger. This has resulted in adjustments ranging from
222 30 to 90 minutes in either direction over at least two dozen
223 distinct periods ranging from one day to several years in length.
224 A mere handful of pre-1991 transitions are unaffected; data since
225 then has come from more reliable contemporaneous reporting. These
226 changes affect various timestamps in 1920-1923, 1936, 1939,
227 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
228 Additionally, Uruguay's pre-standard-time UT offset has been
229 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
230 match the location of the Observatory of the National Meteorological
231 Institute in Montevideo.
232 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
234 Enderbury and Kiritimati skipped New Year's Eve 1994, not
235 New Year's Day 1995. (Thanks to Kerry Shetline.)
237 Fix the 1912-01-01 transition for Portugal and its colonies.
238 This transition was at 00:00 according to the new UT offset, not
239 according to the old one. Also assume that Cape Verde switched on
240 the same date as the rest, not in 1907. This affects
241 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
242 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
243 (Thanks to Michael Deckers.)
245 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
248 Changes to past time zone abbreviations
250 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There
251 is no clock change associated with the transition.
253 Changes to build procedure
255 The new DATAFORM macro in the Makefile lets the installer choose
256 among three source data formats. The idea is to lessen downstream
257 disruption when data formats are improved.
259 * DATAFORM=vanguard installs from the latest, bleeding-edge
260 format. DATAFORM=main (the default) installs from the format
261 used in the 'africa' etc. files. DATAFORM=rearguard installs
262 from a trailing-edge format. Eventually, elements of today's
263 vanguard format should move to the main format, and similarly
264 the main format's features should eventually move to the
267 * In the current version, the main and rearguard formats are
268 identical and match that of 2018c, so this change does not
269 affect default behavior. The vanguard format currently contains
270 one feature not in the main format: negative SAVE values. This
271 improves support for Ireland, which uses Irish Standard Time
272 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has
273 supported negative SAVE values for decades, and this feature
274 should move to the main format soon. However, it will not move
275 to the rearguard format for quite some time because some
276 downstream parsers do not support it.
278 * The build procedure constructs three files vanguard.zi, main.zi,
279 and rearguard.zi, one for each format. The files represent the
280 same data as closely as the formats allow. These three files
281 are intended for downstream data consumers and are not
282 installed. Zoneinfo parsers that do not support negative SAVE values
283 should start using rearguard.zi, so that they will be unaffected
284 when the negative-DST feature moves from vanguard to main.
285 Bleeding-edge Zoneinfo parsers that support the new features
286 already can use vanguard.zi; in this respect, current tzcode is
289 The Makefile should now be safe for parallelized builds, and 'make
290 -j to2050new.tzs' is now much faster on a multiprocessor host
293 When built with -DSUPPRESS_TZDIR, the tzcode library no longer
294 prepends TZDIR/ to file names that do not begin with '/'. This is
295 not recommended for general use, due to its security implications.
296 (From a suggestion by Manuela Friedrich.)
300 zic now accepts subsecond precision in expressions like
301 00:19:32.13, which is approximately the legal time of the
302 Netherlands from 1835 to 1937. However, because it is
303 questionable whether the few recorded uses of non-integer offsets
304 had subsecond precision in practice, there are no plans for tzdata
305 to use this feature. (Thanks to Steve Allen for pointing out
306 the limitations of historical data in this area.)
308 The code is a bit more portable to MS-Windows. Installers can
309 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
310 reserve identifiers like 'localtime'. (Thanks to Manuela
313 Changes to documentation and commentary
315 theory.html now outlines tzdb's extensions to POSIX's model for
316 civil time, and has a section "POSIX features no longer needed"
317 that lists POSIX API components that are now vestigial.
318 (From suggestions by Steve Summit.) It also better distinguishes
319 time zones from tz regions. (From a suggestion by Guy Harris.)
321 Commentary is now more consistent about using the phrase "daylight
322 saving time", to match the C name tm_isdst. Daylight saving time
323 need not occur in summer, and need not have a positive offset from
326 Commentary about historical transitions in Uruguay has been expanded
327 with links to many relevant legal documents.
328 (Thanks to Tim Parenti.)
330 Commentary now uses some non-ASCII characters with Unicode value
331 less than U+0100, as they can be useful and should work even with
332 older editors such as XEmacs.
335 Release 2018c - 2018-01-22 23:00:44 -0800
338 Revert Irish changes that relied on negative SAVE values.
342 Revert the 2018a change to Europe/Dublin. As before, this change
343 does not affect UT offsets or abbreviations; it affects only
344 whether timestamps are considered to be standard time or
345 daylight-saving time, as expressed in the tm_isdst flag of C's
346 struct tm type. This reversion is intended to be a temporary
347 workaround for problems discovered with downstream uses of
348 releases 2018a and 2018b, which implemented Irish time by using
349 negative SAVE values in the Eire rules of the 'europe' file.
350 Although negative SAVE values have been part of tzcode for many
351 years and are supported by many platforms, they were not
352 documented before 2018a and ICU and OpenJDK do not currently
353 support them. A mechanism to export data to platforms lacking
354 support for negative DST is planned to be developed before the
355 change is reapplied. (Problems reported by Deborah Goldsmith and
358 Changes to past timestamps
360 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
361 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
363 Changes to build procedure
365 The build procedure now works around mawk 1.3.3's lack of support
366 for character class expressions. (Problem reported by Ohyama.)
369 Release 2018b - 2018-01-17 23:24:48 -0800
372 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
374 Changes to build procedure
376 The distribution now contains the file 'pacificnew' again.
377 This file was inadvertantly omitted in the 2018a distribution.
378 (Problem reported by Matias Fonzo.)
381 Release 2018a - 2018-01-12 22:29:21 -0800
384 São Tomé and Príncipe switched from +00 to +01.
385 Brazil's DST will now start on November's first Sunday.
386 Ireland's standard time is now in the summer, not the winter.
387 Use Debian-style installation locations, instead of 4.3BSD-style.
390 Changes to past and future timestamps
392 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
393 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
395 Changes to future timestamps
397 Starting in 2018 southern Brazil will begin DST on November's
398 first Sunday instead of October's third Sunday. (Thanks to
401 Changes to past timestamps
403 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
404 been corrected. The 'backzone' and 'zone.tab' files did not agree
405 with the 'africa' and 'zone1970.tab' files. (Problem reported by
408 The abbreviation invented for Bolivia Summer Time (1931-2) is now
409 BST instead of BOST, to be more consistent with the convention
410 used for Latvian Summer Time (1918-9) and for British Summer Time.
414 Change Europe/Dublin so that it observes Irish Standard Time (UT
415 +01) in summer and GMT (as negative daylight-saving) in winter,
416 instead of observing standard time (GMT) in winter and Irish
417 Summer Time (UT +01) in summer. This change does not affect UT
418 offsets or abbreviations; it affects only whether timestamps are
419 considered to be standard time or daylight-saving time, as
420 expressed in the tm_isdst flag of C's struct tm type.
421 (Discrepancy noted by Derick Rethans.)
423 Changes to build procedure
425 The default installation locations have been changed to mostly
426 match Debian circa 2017, instead of being designed as an add-on to
427 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
428 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
429 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
430 locations more precisely. (This responds to suggestions from
431 Brian Inglis and from Steve Summit.)
433 The default installation procedure no longer creates the
434 backward-compatibility link US/Pacific-New, which causes
435 confusion during user setup (e.g., see Debian bug 815200).
436 Use 'make BACKWARD="backward pacificnew"' to create the link
437 anyway, for now. Eventually we plan to remove the link entirely.
439 tzdata.zi now contains a version-number comment.
440 (Suggested by Tom Lane.)
442 The Makefile now quotes values like BACKWARD more carefully when
443 passing them to the shell. (Problem reported by Zefram.)
445 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
446 that have snprintf and use pre-C99 compilers. (Problem reported
451 zic has a new option -t FILE that specifies the location of the
452 file that determines local time when TZ is unset. The default for
453 this location can be configured via the new TZDEFAULT makefile
454 macro, which defaults to /etc/localtime.
456 Diagnostics and commentary now distinguish UT from UTC more
457 carefully; see theory.html for more information about UT vs UTC.
459 zic has been ported to GCC 8's -Wstringop-truncation option.
460 (Problem reported by Martin Sebor.)
462 Changes to documentation and commentary
464 The zic man page now documents the longstanding behavior that
465 times and years can be out of the usual range, with negative times
466 counting backwards from midnight and with year 0 preceding year 1.
467 (Problem reported by Michael Deckers.)
469 The theory.html file now mentions the POSIX limit of six chars
470 per abbreviation, and lists alphabetic abbreviations used.
472 The files tz-art.htm and tz-link.htm have been renamed to
473 tz-art.html and tz-link.html, respectively, for consistency with
474 other file names and to simplify web server configuration.
477 Release 2017c - 2017-10-20 14:49:34 -0700
480 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
481 Fiji ends DST 2018-01-14, not 2018-01-21.
482 Namibia switches from +01/+02 to +02 on 2018-04-01.
483 Sudan switches from +03 to +02 on 2017-11-01.
484 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
485 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
486 A new file tzdata.zi now holds a small text copy of all data.
487 The zic input format has been regularized slightly.
489 Changes to future timestamps
491 Northern Cyprus has decided to resume EU rules starting
492 2017-10-29, thus reinstituting winter time.
494 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
495 predicted. (Thanks to Dominic Fok.) Adjust future predictions
498 Namibia will switch from +01 with DST to +02 all year on
499 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
500 at 02:00. (Thanks to Steffen Thorsen.)
502 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
503 Atyya and Yahia Abdalla.) South Sudan is not switching, so
504 Africa/Juba is no longer a link to Africa/Khartoum.
506 Tonga has likely ended its experiment with DST, and will not
507 adjust its clocks on 2017-11-05. Although Tonga has not announced
508 whether it will continue to observe DST, the IATA is assuming that
509 it will not. (Thanks to David Wade.)
511 Turks & Caicos will switch from -04 all year to -05 with US DST on
512 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
513 at 02:00. (Thanks to Steffen Thorsen.)
515 Changes to past timestamps
517 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
518 (Thanks to Arthur David Olson.)
520 Detroit did not observe DST in 1967.
522 Use railway time for Asia/Kolkata before 1941, by switching to
523 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
524 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
526 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
527 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
529 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
530 American time in 1892, not 1879. (Thanks to Michael Deckers.)
532 Adjust the 1867 transition in Alaska to better reflect the
533 historical record, by changing it to occur on 1867-10-18 at 15:30
534 Sitka time rather than at the start of 1867-10-17 local time.
535 Although strictly speaking this is accurate only for Sitka,
536 the rest of Alaska's blanks need to be filled in somehow.
538 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
539 (Thanks to Michael Deckers.)
541 Add 7 s to the UT offset in Asia/Yangon before 1920.
543 Changes to zone names
545 Remove Canada/East-Saskatchewan from the 'backward' file, as it
546 exceeded the 14-character limit and was an unused misnomer anyway.
548 Changes to build procedure
550 To support applications that prefer to read time zone data in text
551 form, two zic input files tzdata.zi and leapseconds are now
552 installed by default. The commands 'zic tzdata.zi' and 'zic -L
553 leapseconds tzdata.zi' can reproduce the tzdata binary files
554 without and with leap seconds, respectively. To prevent these two
555 new files from being installed, use 'make TZDATA_TEXT=', and to
556 suppress leap seconds from the tzdata text installation, use 'make
557 TZDATA_TEXT=tzdata.zi'.
559 'make BACKWARD=' now suppresses backward-compatibility names
560 like 'US/Pacific' that are defined in the 'backward' and
563 'make check' now works on systems that lack a UTF-8 locale,
564 or that lack the nsgmls program. Set UTF8_LOCALE to configure
565 the name of a UTF-8 locale, if you have one.
567 Y2K runtime checks are no longer enabled by default. Add
568 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
569 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
570 to disable them. (New name suggested by Brian Inglis.)
572 The build procedure for zdump now works on AIX 7.1.
573 (Problem reported by Kees Dekker.)
577 zic and the reference runtime now reject multiple leap seconds
578 within 28 days of each other, or leap seconds before the Epoch.
579 As a result, support for double leap seconds, which was
580 obsolescent and undocumented, has been removed. Double leap
581 seconds were an error in the C89 standard; they have never existed
582 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
583 noticing glitches in the code that uncovered this problem.)
585 zic now warns about use of the obsolescent and undocumented -y
586 option, and about use of the obsolescent TYPE field of Rule lines.
588 zic now allows unambiguous abbreviations like "Sa" and "Su" for
589 weekdays; formerly it rejected them due to a bug. Conversely, zic
590 no longer considers non-prefixes to be abbreviations; for example,
591 it no longer accepts "lF" as an abbreviation for "lastFriday".
592 Also, zic warns about the undocumented usage with a "last-"
593 prefix, e.g., "last-Fri".
595 Similarly, zic now accepts the unambiguous abbreviation "L" for
596 "Link" in ordinary context and for "Leap" in leap-second context.
597 Conversely, zic no longer accepts non-prefixes such as "La" as
598 abbreviations for words like "Leap".
600 zic no longer accepts leap second lines in ordinary input, or
601 ordinary lines in leap second input. Formerly, zic sometimes
602 warned about this undocumented usage and handled it incorrectly.
604 The new macro HAVE_TZNAME governs whether the tzname external
605 variable is exported, instead of USG_COMPAT. USG_COMPAT now
606 governs only the external variables "timezone" and "daylight".
607 This change is needed because the three variables are not in the
608 same category: although POSIX requires tzname, it specifies the
609 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
610 if not defined, the code attempts to guess it from other macros.
612 localtime.c and difftime.c no longer require stdio.h, and .c files
613 other than zic.c no longer require sys/wait.h.
615 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
617 Calculation of time_t extrema works around a bug in GCC 4.8.4
618 (Reported by Stan Shebs and Joseph Myers.)
620 zic.c no longer mistranslates formats of line numbers in non-English
621 locales. (Problem reported by Benno Schulenberg.)
623 Several minor changes have been made to the code to make it a
624 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
625 Dekker for reporting the problems.)
627 Changes to documentation and commentary
629 The two new files 'theory.html' and 'calendars' contain the
630 contents of the removed file 'Theory'. The goal is to document
631 tzdb theory more accessibly.
633 The zic man page now documents abbreviation rules.
635 tz-link.htm now covers how to apply tzdata changes to clients.
636 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
638 The leap-seconds.list URL has been updated to something that is
639 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
641 Release 2017b - 2017-03-17 07:30:38 -0700
643 Briefly: Haiti has resumed DST.
645 Changes to past and future timestamps
647 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
649 Changes to past timestamps
651 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
653 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
654 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
658 The reference localtime implementation now falls back on the
659 current US daylight-saving transition rules rather than the
660 1987-2006 rules. This fallback occurs only when (1) the TZ
661 environment variable has a value like "AST4ADT" that asks
662 for daylight saving time but does not specify the rules, (2) there
663 is no file by that name, and (3) the TZDEFRULES file cannot be
664 loaded. (Thanks to Tom Lane.)
667 Release 2017a - 2017-02-28 00:05:36 -0800
669 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
672 Changes to future timestamps
674 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
676 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
677 Its clocks diverge from America/Santiago starting 2017-05-13 at
678 23:00, hiving off a new zone America/Punta_Arenas. Although the
679 Chilean government says this change expires in May 2019, for now
680 assume it's permanent. (Thanks to Juan Correa and Deborah
681 Goldsmith.) This also affects Antarctica/Palmer.
683 Changes to past timestamps
685 Fix many entries for historical timestamps for Europe/Madrid
686 before 1979, to agree with tables compiled by Pere Planesas of the
687 National Astronomical Observatory of Spain. As a side effect,
688 this changes some timestamps for Africa/Ceuta before 1929, which
689 are probably guesswork anyway. (Thanks to Steve Allen and
690 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
691 correcting the 1901 transition.)
693 Ecuador observed DST from 1992-11-28 to 1993-02-05.
694 (Thanks to Alois Treindl.)
696 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
697 (Thanks to Stepan Golosunov.)
699 Changes to past and future time zone abbreviations
701 Switch to numeric time zone abbreviations for South America, as
702 part of the ongoing project of removing invented abbreviations.
703 This avoids the need to invent an abbreviation for the new Chilean
704 new zone. Similarly, switch from invented to numeric time zone
705 abbreviations for Afghanistan, American Samoa, the Azores,
706 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
707 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
708 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
709 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
710 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
711 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
712 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
713 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
714 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
715 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
716 for half-hour daylight saving time in Belize before 1944 and in
717 the Dominican Republic before 1975; and for Canary Islands before
718 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
719 Indian Summer Time before 1942, for Indonesia before around 1964,
720 for Kenya before 1960, for Liberia before 1973, for Madeira before
721 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
722 Pakistan before 1971, for Western Sahara before 1977, and for
723 Zaporozhye in 1880-1924.
725 For Alaska time from 1900 through 1967, instead of "CAT" use the
726 abbreviation "AST", the abbreviation commonly used at the time
727 (Atlantic Standard Time had not been standardized yet). Use "AWT"
728 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
730 Use "CST" and "CDT" instead of invented abbreviations for Macau
731 before 1999 and Taiwan before 1938, and use "JST" instead of the
732 invented abbreviation "JCST" for Japan and Korea before 1938.
734 Change to database entry category
736 Move the Pacific/Johnston link from 'australasia' to 'backward',
737 since Johnston is now uninhabited.
741 zic no longer mishandles some transitions in January 2038 when it
742 attempts to work around Qt bug 53071. This fixes a bug affecting
743 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
744 now contains a workaround, useful when loading a file generated by
745 a buggy zic. (Problem and localtime.c fix reported by Bradley
748 zdump -i now outputs non-hour numeric time zone abbreviations
749 without a colon, e.g., "+0530" rather than "+05:30". This agrees
750 with zic %z and with common practice, and simplifies auditing of
753 zdump is now buildable again with -DUSE_LTZ=0.
754 (Problem reported by Joseph Myers.)
756 zdump.c now always includes private.h, to avoid code duplication
757 with private.h. (Problem reported by Kees Dekker.)
759 localtime.c no longer mishandles early or late timestamps
760 when TZ is set to a POSIX-style string that specifies DST.
761 (Problem reported by Kees Dekker.)
763 date and strftime now cause %z to generate "-0000" instead of
764 "+0000" when the UT offset is zero and the time zone abbreviation
767 Changes to documentation and commentary
769 The 'Theory' file now better documents choice of historical time
770 zone abbreviations. (Problems reported by Michael Deckers.)
772 tz-link.htm now covers leap smearing, which is popular in clouds.
775 Release 2016j - 2016-11-22 23:17:13 -0800
777 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
779 Changes to future timestamps
781 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
782 This hives off a new zone Europe/Saratov from Europe/Volgograd.
783 (Thanks to Yuri Konotopov and Stepan Golosunov.)
785 Changes to past timestamps
787 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
788 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
789 1999, not fall 1994. (Thanks to Stepan Golosunov.)
791 Changes to past time zone abbreviations
793 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
794 summer time before 1948. The old use of "EET" was a typo.
798 zic no longer mishandles file systems that lack hard links, fixing
799 bugs introduced in 2016g. (Problems reported by Tom Lane.)
800 Also, when the destination already contains symbolic links, zic
801 should now work better on systems where the 'link' system call
802 does not follow symbolic links.
804 Changes to documentation and commentary
806 tz-link.htm now documents the relationship between release version
807 numbers and development-repository commit tags. (Suggested by
810 The 'Theory' file now documents UT.
812 iso3166.tab now accents "Curaçao", and commentary now mentions
813 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
816 Release 2016i - 2016-11-01 23:19:52 -0700
818 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
819 reintroduces DST on 2016-11-06.
821 Changes to future timestamps
823 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
824 2017-01-15 at 03:00. Assume future observances in Tonga will be
825 from the first Sunday in November through the third Sunday in
826 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
827 time zone abbreviations for this zone.
829 Changes to past and future timestamps
831 Northern Cyprus is now +03 year round, causing a split in Cyprus
832 time zones starting 2016-10-30 at 04:00. This creates a zone
833 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
835 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
836 (Thanks to Steffen Thorsen.)
838 Changes to past timestamps
840 Several corrections were made for pre-1975 timestamps in Italy.
841 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
844 First, the 1893-11-01 00:00 transition in Italy used the new UT
845 offset (+01), not the old (+00:49:56). (Thanks to Michael
848 Second, rules for daylight saving in Italy were changed to agree
849 with Italy's National Institute of Metrological Research (INRiM)
850 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
851 Inglis, and Michael Deckers):
853 The 1916-06-03 transition was at 24:00, not 00:00.
855 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
858 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
861 The 1944-09-17 transition was at 03:00, not 01:00. This
862 particular change is taken from Italian law as INRiM's table,
863 (which says 02:00) appears to have a typo here. Also, keep the
864 1944-04-03 transition for Europe/Rome, as Rome was controlled by
867 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
872 The code should now be buildable on AmigaOS merely by setting the
873 appropriate Makefile variables. (From a patch by Carsten Larsen.)
876 Release 2016h - 2016-10-19 23:17:57 -0700
878 Changes to future timestamps
880 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
881 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
882 future fall transitions will be on the last Saturday of October
883 at 01:00, which is consistent with predicted spring transitions
884 on the last Saturday of March. (Thanks to Tim Parenti.)
886 Changes to past timestamps
888 In Turkey, transitions in 1986-1990 were at 01:00 standard time
889 not at 02:00, and the spring 1994 transition was on March 20, not
890 March 27. (Thanks to Kıvanç Yazan.)
892 Changes to past and future time zone abbreviations
894 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
895 instead of alphabetic ones like "IST" and "LKT". Various
896 English-language sources use "IST", "LKT" and "SLST", with no
897 working consensus. (Usage of "SLST" mentioned by Sadika
902 zic no longer mishandles relativizing file names when creating
903 symbolic links like /etc/localtime, when these symbolic links
904 are outside the usual directory hierarchy. This fixes a bug
905 introduced in 2016g. (Problem reported by Andreas Stieger.)
907 Changes to build procedure
909 New rules 'traditional_tarballs' and 'traditional_signatures' for
910 building just the traditional-format distribution. (Requested by
913 The file 'version' is now put into the tzdata tarball too.
914 (Requested by Howard Hinnant.)
916 Changes to documentation and commentary
918 The 'Theory' file now has a section on interface stability.
919 (Requested by Paul Koning.) It also mentions features like
920 tm_zone and localtime_rz that have long been supported by the
923 tz-link.htm has improved coverage of time zone boundaries suitable
924 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
927 The US commentary now mentions Allen and the "day of two noons".
929 The Fiji commentary mentions the government's 2016-10-03 press
930 release. (Thanks to Raymond Kumar.)
933 Release 2016g - 2016-09-13 08:56:38 -0700
935 Changes to future timestamps
937 Turkey switched from EET/EEST (+02/+03) to permanent +03,
938 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
939 than an invented abbreviation for the new time.
941 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
942 (Thanks to Tim Parenti.)
944 Changes to past timestamps
946 For America/Los_Angeles, spring-forward transition times have been
947 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
950 For zones using Soviet time on 1919-07-01, transitions to UT-based
951 time were at 00:00 UT, not at 02:00 local time. The affected
952 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
953 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
955 Changes to past and future time zone abbreviations
957 The Factory zone now uses the time zone abbreviation -00 instead
958 of a long English-language string, as -00 is now the normal way to
959 represent an undefined time zone.
961 Several zones in Antarctica and the former Soviet Union, along
962 with zones intended for ships at sea that cannot use POSIX TZ
963 strings, now use numeric time zone abbreviations instead of
964 invented or obsolete alphanumeric abbreviations. The affected
965 zones are Antarctica/Casey, Antarctica/Davis,
966 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
967 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
968 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
969 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
970 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
971 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
972 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
973 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
974 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
975 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
976 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
977 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
978 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
979 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
980 was replaced by +05, whereas MSK and MSD were kept as they are not
981 our invention and are widely used.
983 Changes to zone names
985 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
986 (Thanks to David Massoud.)
990 zic no longer generates binary files containing POSIX TZ-like
991 strings that disagree with the local time type after the last
992 explicit transition in the data. This fixes a bug with
993 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
994 on the reference platform. (Thanks to Alexander Belopolsky for
995 reporting the bug and suggesting a way forward.)
997 If the installed localtime and/or posixrules files are symbolic
998 links, zic now keeps them symbolic links when updating them, for
999 compatibility with platforms like OpenSUSE where other programs
1000 configure these files as symlinks.
1002 zic now avoids hard linking to symbolic links, avoids some
1003 unnecessary mkdir and stat system calls, and uses shorter file
1006 zdump has a new -i option to generate transitions in a
1007 more-compact but still human-readable format. This option is
1008 experimental, and the output format may change in future versions.
1009 (Thanks to Jon Skeet for suggesting that an option was needed,
1010 and thanks to Tim Parenti and Chris Rovick for further comments.)
1012 Changes to build procedure
1014 An experimental distribution format is available, in addition
1015 to the traditional format which will continue to be distributed.
1016 The new format is a tarball tzdb-VERSION.tar.lz with signature
1017 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
1018 tzdb-VERSION containing the code and data of the traditional
1019 two-tarball format, along with extra data that may be useful.
1020 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
1021 for comments about the experimental format.)
1023 The release version number is now more accurate in the usual case
1024 where releases are built from a Git repository. For example, if
1025 23 commits and some working-file changes have been made since
1026 release 2016g, the version number is now something like
1027 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
1028 Tagged releases use the same version number format as before,
1029 e.g., '2016g'. To support the more-accurate version number, its
1030 specification has moved from a line in the Makefile to a new
1031 source file 'version'.
1033 The experimental distribution contains a file to2050.tzs that
1034 contains what should be the output of 'zdump -i -c 2050' on
1035 primary zones. If this file is available, 'make check' now checks
1036 that zdump generates this output.
1038 'make check_web' now works on Fedora-like distributions.
1040 Changes to documentation and commentary
1042 tzfile.5 now documents the new restriction on POSIX TZ-like
1043 strings that is now implemented by zic.
1045 Comments now cite URLs for some 1917-1921 Russian DST decrees.
1046 (Thanks to Alexander Belopolsky.)
1048 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
1049 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
1050 description of Java 8 has been brought up to date (thanks to
1051 Stephen Colebourne). Its description of local time on Mars has
1052 been updated to match current practice, and URLs have been updated
1053 and some obsolete ones removed.
1056 Release 2016f - 2016-07-05 16:26:51 +0200
1058 Changes affecting future timestamps
1060 The Egyptian government changed its mind on short notice, and
1061 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
1062 (Thanks to Mina Samuel.)
1064 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
1065 (Thanks to Stepan Golosunov.)
1067 Changes to past and future timestamps
1069 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
1070 abbreviations instead of invented ones.
1072 Changes affecting past timestamps
1074 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
1075 (Thanks to Stepan Golosunov.)
1078 Release 2016e - 2016-06-14 08:46:16 -0700
1080 Changes affecting future timestamps
1082 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
1083 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
1084 For future years, guess April's last Thursday to October's last
1085 Thursday except for Ramadan.
1087 Changes affecting past timestamps
1089 Locations while uninhabited now use '-00', not 'zzz', as a
1090 placeholder time zone abbreviation. This is inspired by Internet
1091 RFC 3339 and is more consistent with numeric time zone
1092 abbreviations already used elsewhere. The change affects several
1093 arctic and antarctic locations, e.g., America/Cambridge_Bay before
1094 1920 and Antarctica/Troll before 2005.
1096 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
1097 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
1101 zic now outputs a dummy transition at time 2**31 - 1 in zones
1102 whose POSIX-style TZ strings contain a '<'. This mostly works
1103 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
1104 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
1106 Changes affecting documentation and commentary
1108 tz-link.htm says why governments should give plenty of notice for
1109 time zone or DST changes, and refers to Matt Johnson's blog post.
1111 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
1114 Release 2016d - 2016-04-17 22:50:29 -0700
1116 Changes affecting future timestamps
1118 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
1119 (Thanks to Alexander Krivenyshev for the heads-up.)
1121 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
1122 (Thanks to Alexander Krivenyshev and Matt Johnson.)
1124 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
1125 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
1126 at 02:00. (Thanks to Stepan Golosunov.)
1128 Changes affecting past timestamps
1130 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
1131 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1132 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1133 the same change. (Thanks to Stepan Golosunov.)
1135 Russia and nearby locations had daylight-saving transitions on
1136 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1137 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
1140 Many corrections to historical time in Kazakhstan from 1991
1141 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
1142 invented time zone abbreviations with numeric abbreviations.
1144 Changes to commentary
1146 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1149 Release 2016c - 2016-03-23 00:51:27 -0700
1151 Changes affecting future timestamps
1153 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
1155 Chile reverts from permanent to seasonal DST. (Thanks to Juan
1156 Correa for the heads-up, and to Tim Parenti for corrections.)
1157 Guess that future transitions are August's and May's second
1158 Saturdays at 24:00 mainland time. Also, call the period from
1159 2014-09-07 through 2016-05-14 daylight saving time instead of
1160 standard time, as that seems more appropriate now.
1162 Changes affecting past timestamps
1164 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1165 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1166 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1167 (Thanks to Stepan Golosunov.)
1169 Changes to commentary
1171 Several updates and URLs for historical and proposed Russian changes.
1172 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1175 Release 2016b - 2016-03-12 17:30:14 -0800
1179 Starting with release 2016b, some data entries cause zic implementations
1180 derived from tz releases 2005j through 2015e to issue warnings like
1181 "time zone abbreviation differs from POSIX standard (+03)".
1182 These warnings should not otherwise affect zic's output and can safely be
1183 ignored on today's platforms, as the warnings refer to a restriction in
1184 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
1185 warnings is to upgrade to zic derived from tz releases 2015f and later.
1187 Changes affecting future timestamps
1189 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1190 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1191 2016-03-27 at 02:00 local time. They need distinct zones since their
1192 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
1193 Altai Republic, Russia, which will switch from +06 to +07 on the same date
1194 and local time. The Astrakhan change is already official; the others have
1195 passed the first reading in the State Duma and are extremely likely.
1196 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1197 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1198 and Stepan Golosunov for followup.)
1200 As a trial of a new system that needs less information to be made up,
1201 the new zones use numeric time zone abbreviations like "+04"
1202 instead of invented abbreviations like "ASTT".
1204 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
1207 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1208 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1209 Saturday at 01:00, not March's last Friday at 24:00.
1211 Changes affecting past timestamps
1213 Europe/Chisinau observed DST during 1990, and switched from +04 to
1214 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1215 (Thanks to Stepan Golosunov.)
1217 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1218 KUYT/KUYST. (Thanks to Stepan Golosunov.)
1222 tzselect's diagnostics and checking, and checktab.awk's checking,
1223 have been improved. (Thanks to J William Piggott.)
1225 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
1227 tzselect now tests Julian-date TZ settings more accurately.
1228 (Thanks to J William Piggott.)
1230 Changes to commentary
1232 Comments in zone tables have been improved. (Thanks to J William Piggott.)
1234 tzselect again limits its menu comments so that menus fit on a
1235 24×80 alphanumeric display.
1237 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
1239 In the Theory file, the description of possible time zone abbreviations in
1240 tzdata has been cleaned up, as the old description was unclear and
1241 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
1244 Release 2016a - 2016-01-26 23:28:02 -0800
1246 Changes affecting future timestamps
1248 America/Cayman will not observe daylight saving this year after all.
1249 Revert our guess that it would. (Thanks to Matt Johnson.)
1251 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1252 (Thanks to Alexander Krivenyshev.)
1254 Asia/Tehran now has DST predictions for the year 2038 and later,
1255 to be March 21 00:00 to September 21 00:00. This is likely better
1256 than predicting no DST, albeit off by a day every now and then.
1258 Changes affecting past and future timestamps
1260 America/Metlakatla switched from PST all year to AKST/AKDT on
1261 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1263 America/Santa_Isabel has been removed, and replaced with a
1264 backward compatibility link to America/Tijuana. Its contents were
1265 apparently based on a misreading of Mexican legislation.
1267 Changes affecting past timestamps
1269 Asia/Karachi's two transition times in 2002 were off by a minute.
1270 (Thanks to Matt Johnson.)
1272 Changes affecting build procedure
1274 An installer can now combine leap seconds with use of the backzone file,
1275 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1276 The old 'make posix_packrat' rule is now marked as obsolescent.
1277 (Thanks to Ian Abbott for an initial implementation.)
1279 Changes affecting documentation and commentary
1281 A new file LICENSE makes it easier to see that the code and data
1282 are mostly public-domain. (Thanks to James Knight.) The three
1283 non-public-domain files now use the current (3-clause) BSD license
1284 instead of older versions of that license.
1286 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1287 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1288 on editing tz source files (with a mention of Sublime zoneinfo,
1289 thanks to Gilmore Davidson).
1291 The Theory and asia files now mention the 2015 book "The Global
1292 Transformation of Time, 1870-1950", and cite a couple of reviews.
1294 The America/Chicago entry now documents the informal use of US
1295 central time in Fort Pierre, South Dakota. (Thanks to Rick
1296 McDermid, Matt Johnson, and Steve Jones.)
1299 Release 2015g - 2015-10-01 00:39:51 -0700
1301 Changes affecting future timestamps
1303 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1306 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1307 (Thanks to Alexander Krivenyshev.)
1309 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1310 (Thanks to Ken Rylander.)
1312 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
1313 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1314 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
1316 Changes affecting past timestamps
1318 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1320 Changes affecting code
1322 localtime no longer mishandles America/Anchorage after 2037.
1323 (Thanks to Bradley White for reporting the bug.)
1325 On hosts with signed 32-bit time_t, localtime no longer mishandles
1326 Pacific/Fiji after 2038-01-16 14:00 UTC.
1328 The localtime module allows the variables 'timezone', 'daylight',
1329 and 'altzone' to be in common storage shared with other modules,
1330 and declares them in case the system <time.h> does not.
1331 (Problems reported by Kees Dekker.)
1333 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1334 This simplifies the code and is consistent with zdump.c.
1335 (Problem reported by Christos Zoulas.)
1337 Changes affecting documentation
1339 The tzfile man page now documents that transition times denote the
1340 starts (not the ends) of the corresponding time periods.
1341 (Ambiguity reported by Bill Seymour.)
1344 Release 2015f - 2015-08-10 18:06:56 -0700
1346 Changes affecting future timestamps
1348 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1349 The abbreviation remains "KST". (Thanks to Robert Elz.)
1351 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1354 Changes affecting past and future timestamps
1356 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1357 (Thanks to Roman Tudos.)
1359 Changes affecting data format and code
1361 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1362 field of a Rule line should now be '-'; the old values 'even',
1363 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1364 Although the implementation has not changed, these features do not
1365 work in the default installation, they are not used in the data,
1366 and they are now considered obsolescent.
1368 zic now checks that two rules don't take effect at the same time.
1369 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1370 simultaneity are now documented.
1372 The two characters '%z' in a zone format now stand for the UT
1373 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1374 five hours and thirty minutes ahead. This better supports time
1375 zone abbreviations conforming to POSIX.1-2001 and later.
1377 Changes affecting installed data files
1379 Comments for America/Halifax and America/Glace_Bay have been improved.
1380 (Thanks to Brian Inglis.)
1382 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1383 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1384 installed data files for Europe/Simferopol and Europe/Tallinn.
1385 It does not affect timestamps. (Thanks to Howard Hinnant.)
1387 Changes affecting code
1389 zdump and zic no longer warn about valid time zone abbreviations
1392 Some Visual Studio 2013 warnings have been suppressed.
1393 (Thanks to Kees Dekker.)
1395 'date' no longer sets the time of day and its -a, -d, -n and -t
1396 options have been removed. Long obsolescent, the implementation
1397 of these features had porting problems. Builders no longer need
1398 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1399 (Thanks to Kees Dekker for pointing out the problem.)
1401 Changes affecting documentation
1403 The Theory file mentions naming issues earlier, as these seem to be
1404 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1406 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1408 Mention that Herbert Samuel introduced the term "Summer Time".
1411 Release 2015e - 2015-06-13 10:56:02 -0700
1413 Changes affecting future timestamps
1415 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1416 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1418 Assume Cayman Islands will observe DST starting next year, using US rules.
1419 Although it isn't guaranteed, it is the most likely.
1421 Changes affecting data format
1423 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1424 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1426 Changes affecting code
1428 When displaying data, tzselect converts it to the current locale's
1429 encoding if the iconv command works. (Problem reported by random832.)
1431 tzselect no longer mishandles Dominica, fixing a bug introduced
1432 in Release 2014f. (Problem reported by Owen Leibman.)
1434 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1435 This fixes a bug introduced in Release 2014f.
1436 (Problem reported by Leonardo Chiquitto.)
1439 Release 2015d - 2015-04-24 08:09:46 -0700
1441 Changes affecting future timestamps
1443 Egypt will not observe DST in 2015 and will consider canceling it
1444 permanently. For now, assume no DST indefinitely.
1445 (Thanks to Ahmed Nazmy and Tim Parenti.)
1447 Changes affecting past timestamps
1449 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1450 1966-07-01. Also, Yukon's time zone history is documented better.
1451 (Thanks to Brian Inglis and Dennis Ferguson.)
1453 Change affecting past and future time zone abbreviations
1455 The abbreviations for Hawaii-Aleutian standard and daylight times
1456 have been changed from HAST/HADT to HST/HDT, as per US Government
1457 Printing Office style. This affects only America/Adak since 1983,
1458 as America/Honolulu was already using the new style.
1460 Changes affecting code
1462 zic has some minor performance improvements.
1465 Release 2015c - 2015-04-11 08:55:55 -0700
1467 Changes affecting future timestamps
1469 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1470 not 00:00 on April's last Friday. 2015's transition will therefore be on
1471 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1472 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1474 Changes affecting past timestamps
1476 The following changes affect some pre-1991 Chile-related timestamps
1477 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1479 The 1910 transition was January 10, not January 1.
1481 The 1918 transition was September 10, not September 1.
1483 The UT -04 time observed from 1932 to 1942 is now considered to
1484 be standard time, not year-round DST.
1486 Santiago observed DST (UT -03) from 1946-07-15 through
1487 1946-08-31, then reverted to standard time, then switched to -05
1490 Assume transitions before 1968 were at 00:00, since we have no data
1493 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1494 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1496 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1497 and omit all transitions on Pacific/Easter from 1942 through 1946
1498 since we have no data suggesting that they existed.
1500 One more zone has been turned into a link, as it differed
1501 from an existing zone only for older timestamps. As usual,
1502 this change affects UT offsets in pre-1970 timestamps only.
1503 The zone's old contents have been moved to the 'backzone' file.
1504 The affected zone is America/Montreal.
1506 Changes affecting commentary
1508 Mention the TZUpdater tool.
1510 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1513 Release 2015b - 2015-03-19 23:28:11 -0700
1515 Changes affecting future timestamps
1517 Mongolia will start observing DST again this year, from the last
1518 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1519 (Thanks to Ganbold Tsagaankhuu.)
1521 Palestine will start DST on March 28, not March 27. Also,
1522 correct the fall 2014 transition from September 26 to October 24.
1523 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1525 Changes affecting past timestamps
1527 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1528 regression. (Thanks to Stuart Bishop for reporting the problem.)
1530 Some more zones have been turned into links, when they differed
1531 from existing zones only for older timestamps. As usual,
1532 these changes affect UT offsets in pre-1970 timestamps only.
1533 Their old contents have been moved to the 'backzone' file.
1534 The affected zones are: America/Antigua, America/Cayman,
1535 Pacific/Midway, and Pacific/Saipan.
1537 Changes affecting time zone abbreviations
1539 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1542 Changes affecting code
1544 Fix integer overflow bug in reference 'mktime' implementation.
1545 (Problem reported by Jörg Richter.)
1547 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1548 to be used in the same executable as standard-library time_t functions.
1549 (Problems reported by Bradley White.)
1551 Changes affecting commentary
1553 Cite the recent Mexican decree changing Quintana Roo's time zone.
1554 (Thanks to Carlos Raúl Perasso.)
1556 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1558 Update info about Mars time.
1561 Release 2015a - 2015-01-29 22:35:20 -0800
1563 Changes affecting future timestamps
1565 The Mexican state of Quintana Roo, represented by America/Cancun,
1566 will shift from Central Time with DST to Eastern Time without DST
1567 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1569 Chile will not change clocks in April or thereafter; its new standard time
1570 will be its old daylight saving time. This affects America/Santiago,
1571 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1573 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1574 (Thanks to Tim Parenti.)
1576 Changes affecting past timestamps
1578 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1579 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1580 Shanks about time in Iceland between 1837 and 1908.
1582 Some more zones have been turned into links, when they differed
1583 from existing zones only for older timestamps. As usual,
1584 these changes affect UT offsets in pre-1970 timestamps only.
1585 Their old contents have been moved to the 'backzone' file.
1586 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1589 Changes affecting code
1591 tzalloc now scrubs time zone abbreviations compatibly with the way
1592 that tzset always has, by replacing invalid bytes with '_' and by
1593 shortening too-long abbreviations.
1595 tzselect ports to POSIX awk implementations, no longer mishandles
1596 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1597 settings to the user. (Thanks to Stefan Kuhn.)
1599 Changes affecting build procedure
1601 'make check' now checks for links to links in the data.
1602 One such link (for Africa/Asmera) has been fixed.
1603 (Thanks to Stephen Colebourne for pointing out the problem.)
1605 Changes affecting commentary
1607 The leapseconds file commentary now mentions the expiration date.
1608 (Problem reported by Martin Burnicki.)
1610 Update Mexican Library of Congress URL.
1613 Release 2014j - 2014-11-10 17:37:11 -0800
1615 Changes affecting current and future timestamps
1617 Turks & Caicos' switch from US eastern time to UT -04 year-round
1618 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1619 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1621 Changes affecting past timestamps
1623 Many pre-1989 timestamps have been corrected for Asia/Seoul and
1624 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1625 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1626 longer guess that Pyongyang mimicked Seoul time after World War II,
1627 as this is politically implausible.
1629 Some more zones have been turned into links, when they differed
1630 from existing zones only for older timestamps. As usual,
1631 these changes affect UT offsets in pre-1970 timestamps only.
1632 Their old contents have been moved to the 'backzone' file.
1633 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1634 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1635 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1638 Changes affecting commentary
1640 The commentary is less enthusiastic about Shanks as a source,
1641 and is more careful to distinguish UT from UTC.
1644 Release 2014i - 2014-10-21 22:04:57 -0700
1646 Changes affecting future timestamps
1648 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1649 (Thanks to Ken Rylander for the heads-up.) Guess that future
1650 years will use a similar pattern.
1652 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1653 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1654 (Thanks to Kiley Walbom for the heads-up.)
1656 Changes affecting time zone abbreviations
1658 Since Belarus is not changing its clocks even though Moscow is,
1659 the time zone abbreviation in Europe/Minsk is changing from FET
1660 to its more-traditional value MSK on 2014-10-26 at 01:00.
1661 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1663 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1664 Indochina, to distinguish it better from ICT (+07).
1666 Changes affecting past timestamps
1668 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
1669 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1670 authoritative book). Asia/Ho_Chi_Minh has been added to
1671 zone1970.tab, to give tzselect users in Vietnam two choices,
1672 since north and south Vietnam disagreed after our 1970 cutoff.
1674 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1675 they differed from existing zones only for older timestamps. As
1676 usual, these changes affect pre-1970 timestamps only. Their old
1677 contents have been moved to the 'backzone' file.
1679 Changes affecting code
1681 The time-related library functions now set errno on failure, and
1682 some crashes in the new tzalloc-related library functions have
1683 been fixed. (Thanks to Christos Zoulas for reporting most of
1684 these problems and for suggesting fixes.)
1686 If USG_COMPAT is defined and the requested timestamp is standard time,
1687 the tz library's localtime and mktime functions now set the extern
1688 variable timezone to a value appropriate for that timestamp; and
1689 similarly for ALTZONE, daylight saving time, and the altzone variable.
1690 This change is a companion to the tzname change in 2014h, and is
1691 designed to make timezone and altzone more compatible with tzname.
1693 The tz library's functions now set errno to EOVERFLOW if they fail
1694 because the result cannot be represented. ctime and ctime_r now
1695 return NULL and set errno when a timestamp is out of range, rather
1696 than having undefined behavior.
1698 Some bugs associated with the new 2014g functions have been fixed.
1699 This includes a bug that largely incapacitated the new functions
1700 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1701 It also includes some uses of uninitialized variables after tzalloc.
1702 The new code uses the standard type 'ssize_t', which the Makefile
1703 now gives porting advice about.
1705 Changes affecting commentary
1707 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1710 Release 2014h - 2014-09-25 18:59:03 -0700
1712 Changes affecting past timestamps
1714 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1716 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1717 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1719 Some more zones have been turned into links, when they differed
1720 from existing zones only for older timestamps. As usual,
1721 these changes affect UT offsets in pre-1970 timestamps only.
1722 Their old contents have been moved to the 'backzone' file.
1723 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1724 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1725 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1727 Changes affecting code
1729 zdump -V and -v now output gmtoff= values on all platforms,
1730 not merely on platforms defining TM_GMTOFF.
1732 The tz library's localtime and mktime functions now set tzname to a value
1733 appropriate for the requested timestamp, and zdump now uses this
1734 on platforms not defining TM_ZONE, fixing a 2014g regression.
1735 (Thanks to Tim Parenti for reporting the problem.)
1737 The tz library no longer sets tzname if localtime or mktime fails.
1739 zdump -c no longer mishandles transitions near year boundaries.
1740 (Thanks to Tim Parenti for reporting the problem.)
1742 An access to uninitialized data has been fixed.
1743 (Thanks to Jörg Richter for reporting the problem.)
1745 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1746 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1747 and two threads race to initialize data used by gmtime-like functions.
1748 (Thanks to Andy Heninger for reporting the problems.)
1750 Changes affecting build procedure
1752 'make check' now checks better for properly-sorted data.
1754 Changes affecting documentation and commentary
1756 zdump's gmtoff=N output is now documented, and its isdst=D output
1757 is now documented to possibly output D values other than 0 or 1.
1759 zdump -c's treatment of years is now documented to use the
1760 Gregorian calendar and Universal Time without leap seconds,
1761 and its behavior at cutoff boundaries is now documented better.
1762 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1764 Programs are now documented to use the proleptic Gregorian calendar.
1765 (Thanks to Alan Barrett for the suggestion.)
1767 Fractional-second GMT offsets have been documented for civil time
1768 in 19th-century Chennai, Jakarta, and New York.
1771 Release 2014g - 2014-08-28 12:31:23 -0700
1773 Changes affecting future timestamps
1775 Turks & Caicos is switching from US eastern time to UT -04
1776 year-round, modeled as a switch on 2014-11-02 at 02:00.
1777 [As noted in 2014j, this switch was later delayed.]
1779 Changes affecting past timestamps
1781 Time in Russia or the USSR before 1926 or so has been corrected by
1782 a few seconds in the following zones: Asia/Irkutsk,
1783 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1784 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1785 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1786 Vladimir Karpinsky.)
1788 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1789 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1790 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1791 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1792 (Thanks to Stephen Colebourne for pointing to the decree.)
1794 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1796 A new file 'backzone' contains data which may appeal to
1797 connoisseurs of old timestamps, although it is out of scope for
1798 the tz database, is often poorly sourced, and contains some data
1799 that is known to be incorrect. The new file is not recommended
1800 for ordinary use and its entries are not installed by default.
1801 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1802 Isle of Man entries.)
1804 Some more zones have been turned into links, when they differed
1805 from existing zones only for older timestamps. As usual,
1806 these changes affect UT offsets in pre-1970 timestamps only.
1807 Their old contents have been moved to the 'backzone' file.
1808 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1809 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1810 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1812 Changes affecting code
1814 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1815 supplies functions for creating and using objects that represent
1816 timezones. The new functions are tzalloc, tzfree, localtime_rz,
1817 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1818 time2posix_z. They are intended for performance: for example,
1819 localtime_rz (unlike localtime_r) is trivially thread-safe without
1820 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1821 functions, and to Alan Barrett and Jonathan Lennox for helping to
1824 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1825 This lets zdump use tz features even if the system library lacks them.
1826 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1827 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1829 zdump now uses localtime_rz if available, as it's significantly faster,
1830 and it can help zdump better diagnose invalid timezone names.
1831 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1832 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1833 not available, zdump now uses localtime_r and tzset if available,
1834 as this is a bit cleaner and faster than plain localtime. Compile
1835 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1836 lacks these two functions.
1838 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1839 Although not needed for tz's own applications, which are single-threaded,
1840 this supports POSIX better if the tz library is used in multithreaded apps.
1842 Some crashes have been fixed when zdump or the tz library is given
1843 invalid or outlandish input.
1845 The tz library no longer mishandles leap seconds on platforms with
1846 unsigned time_t in timezones that lack ordinary transitions after 1970.
1848 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1849 already defined, to make it easier to configure on common platforms.
1850 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1852 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1853 assumes that reading uninitialized memory yields garbage values
1854 but does not cause other problems such as traps.
1856 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1857 more likely to guess right for ambiguous timestamps near
1858 transitions where tm_isdst does not change.
1860 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1861 strftime_l for compatibility with recent versions of POSIX.
1862 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1863 to 1 on recent POSIX versions, and to 0 otherwise.
1865 tzselect -c now uses a hybrid distance measure that works better
1866 in Africa. (Thanks to Alan Barrett for noting the problem.)
1868 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1869 or when time_tz is defined.
1871 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1872 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1873 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1874 This affects GNU/Linux and similar systems.
1876 For easier maintenance later, some C code has been simplified,
1877 some lint has been removed, and the code has been tweaked so that
1878 plain 'make' is more likely to work.
1880 The C type 'bool' is now used for boolean values, instead of 'int'.
1882 The long-obsolete LOCALE_HOME code has been removed.
1884 The long-obsolete 'gtime' function has been removed.
1886 Changes affecting build procedure
1888 'zdump' no longer links in ialloc.o, as it's not needed.
1890 'make check_time_t_alternatives' no longer assumes GNU diff.
1892 Changes affecting distribution tarballs
1894 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1895 the tzdata tarball instead of the tzcode tarball, since they help
1896 maintain the data. The NEWS and Theory files are now also
1897 distributed in the tzdata tarball, as they're relevant for data.
1898 (Thanks to Alan Barrett for pointing this out.) Also, the
1899 leapseconds.awk file is no longer distributed in the tzcode
1900 tarball, since it belongs in the tzdata tarball (where 2014f
1901 inadvertently also distributed it).
1903 Changes affecting documentation and commentary
1905 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1906 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1909 The man pages have been updated to use function prototypes,
1910 to document thread-safe variants like localtime_r, and to document
1911 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1914 The fields in Link lines have been renamed to be more descriptive
1915 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1916 and LINK-TO has become LINK-NAME.
1918 tz-link.htm mentions the IETF's tzdist working group; Windows
1919 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1921 Some broken URLs have been fixed in the commentary. (Thanks to
1924 Commentary about Philippines DST has been updated, and commentary
1925 on pre-1970 time in India has been added.
1928 Release 2014f - 2014-08-05 17:42:36 -0700
1930 Changes affecting future timestamps
1932 Russia will subtract an hour from most of its time zones on 2014-10-26
1933 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1934 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1935 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1936 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1937 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1938 (Europe/Samara) are not changing their clocks. The changed zones are
1939 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1940 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1941 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1942 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1943 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1944 but not its UTC offset. Two zones are added: Asia/Chita (split
1945 from Asia/Yakutsk, and also with two hours subtracted) and
1946 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1947 subtracted). (Thanks to Tim Parenti for much of the above.)
1949 Changes affecting time zone abbreviations
1951 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1952 and similarly for the other Australian zones. That is, for eastern
1953 standard and daylight saving time the abbreviations are AEST and AEDT
1954 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1955 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1956 This change does not affect UT offsets, only time zone abbreviations.
1957 (Thanks to Rich Tibbett and many others.)
1959 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1960 effective 2014-10-26 at 02:00 local time.
1962 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1963 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1965 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1966 Similarly, prefer EET/EEST for eastern European time in Russia.
1968 Change time zone abbreviations in (western) Samoa to use "ST" and
1969 "DT" suffixes, as this is more likely to match common practice.
1970 Prefix "W" to (western) Samoa time when its standard-time offset
1971 disagrees with that of American Samoa.
1973 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1975 Time zone abbreviations have been updated for Japan's two time
1976 zones used 1896-1937. JWST now stands for Western Standard
1977 Time, and JCST for Central Standard Time (formerly this was CJT).
1978 These abbreviations are now used for time in Korea, Taiwan,
1979 and Sakhalin while controlled by Japan.
1981 Changes affecting past timestamps
1983 China's five zones have been simplified to two, since the post-1970
1984 differences in the other three seem to have been imaginary. The
1985 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1986 removed; backwards-compatibility links still work, albeit with
1987 different behaviors for timestamps before May 1980. Asia/Urumqi's
1988 1980 transition to UT +08 has been removed, so that it is now at
1989 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1990 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1992 Some zones have been turned into links, when they differed from existing
1993 zones only for older UT offsets where data entries were likely invented.
1994 These changes affect UT offsets in pre-1970 timestamps only. This is
1995 similar to the change in release 2013e, except this time for western
1996 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1997 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1998 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1999 Atlantic/St_Helena. This also affects the backwards-compatibility
2000 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
2001 Tim Parenti, and David Patte for reporting problems in earlier
2002 versions of this change.)
2004 Asia/Shanghai's pre-standard-time UT offset has been changed from
2005 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
2006 transition to standard time has been changed from 1928 to 1901.
2008 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
2009 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
2010 In 1946 it observed DST from 05-15 through 09-30; in 1947
2011 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
2012 (Thanks to Yu-Cheng Chuang.)
2014 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
2016 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
2017 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
2019 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
2020 period from 1911 to 1950.
2022 Pacific/Chatham has been changed to New Zealand standard time plus
2023 45 minutes for the period before 1957, reflecting a 1956 remark in
2024 the New Zealand parliament.
2026 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
2027 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
2028 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
2029 not 04-06 at 02:00; and there was no DST in 1920.
2031 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
2033 Time in Russia before 1927 or so has been corrected by a few seconds in
2034 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
2035 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
2036 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
2037 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
2039 Changes affecting data format
2041 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
2042 The new file's extended format allows multiple country codes per zone.
2043 The older file is still installed but is deprecated; its format is
2044 not changing and it will still be distributed for a while, but new
2045 applications should use the new file.
2047 The new file format simplifies maintenance of obscure locations.
2048 To test this, it adds coverage for the Crozet Islands and the
2049 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
2051 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
2052 It is still ASCII now, but commentary about the switch has been added.
2053 The new file 'zone1970.tab' already uses UTF-8.
2055 Changes affecting code
2057 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
2058 is defined. (Thanks to Elliott Hughes for reporting the problem.)
2060 'zic' no longer mishandles input when ignoring case in locales that
2061 are not compatible with English, e.g., unibyte Turkish locales when
2062 compiled with HAVE_GETTEXT.
2064 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
2065 they no longer use ASCII '-' as if it were a dash.
2067 'zic' now rejects output file names that contain '.' or '..' components.
2068 (Thanks to Tim Parenti for reporting the problem.)
2070 'zic -v' now warns about output file names that do not follow
2071 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
2072 David Olson for starting the ball rolling on this.)
2074 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
2076 Changes affecting build procedure
2078 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
2079 (Thanks to John Cochran.)
2081 Changes affecting documentation and commentary
2083 The 'Theory' file documents legacy names, the longstanding
2084 exceptions to the POSIX-inspired file name rules.
2086 The 'zic' documentation clarifies the role of time types when
2087 interpreting dates. (Thanks to Arthur David Olson.)
2089 Documentation and commentary now prefer UTF-8 to US-ASCII,
2090 allowing the use of proper accents in foreign words and names.
2091 Code and data have not changed because of this. (Thanks to
2092 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
2095 Non-HTML documentation and commentary now use plain-text URLs instead of
2096 HTML insertions, and are more consistent about bracketing URLs when they
2097 are not already surrounded by white space. (Thanks to suggestions by
2100 There is new commentary about Xujiahui Observatory, the five time-zone
2101 project in China from 1918 to 1949, timekeeping in Japanese-occupied
2102 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
2103 warlord Jin Shuren in the data.
2105 Commentary about the coverage of each Russian zone has been standardized.
2106 (Thanks to Tim Parenti).
2108 There is new commentary about contemporary timekeeping in Ethiopia.
2110 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
2112 There is new commentary about time in Poland in 1919.
2114 Proper credit has been given to DST inventor George Vernon Hudson.
2116 Commentary about time in Metlakatla, AK and Resolute, NU has been
2117 improved, with a new source for the former.
2119 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
2122 Commentary about permanent Antarctic bases has been updated.
2124 Several typos have been corrected. (Thanks to Tim Parenti for
2125 contributing some of these fixes.)
2127 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
2128 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
2129 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
2130 (Thanks to a heads-up from Dirkjan Ochtman.)
2132 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2133 have been removed. These obsolescent US Naval Observatory entries were no
2134 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
2137 Release 2014e - 2014-06-12 21:53:52 -0700
2139 Changes affecting near-future timestamps
2141 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2142 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
2143 switch to standard time at 24:00 the last Thursday before Ramadan, and
2144 back to DST at 00:00 the first Friday after Ramadan.
2146 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
2147 to Milamber Space Network.) Guess that from 2015 on Morocco will
2148 temporarily switch to standard time at 03:00 the last Saturday before
2149 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2151 Changes affecting past timestamps
2153 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2154 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
2155 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2156 in 1991. (Thanks to Hank W. for reporting the problems.)
2158 Changes affecting commentary
2160 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2161 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2162 removes stale pointers to World Time Explorer and WORLDTIME.
2165 Release 2014d - 2014-05-27 21:34:40 -0700
2167 Changes affecting code
2169 zic no longer generates files containing timestamps before the Big Bang.
2170 This works around GNOME glib bug 878
2171 <https://gitlab.gnome.org/GNOME/glib/issues/878>
2172 (Thanks to Leonardo Chiquitto for reporting the bug, and to
2173 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2175 Changes affecting documentation
2177 tz-link.htm now mentions GNOME.
2180 Release 2014c - 2014-05-13 07:44:13 -0700
2182 Changes affecting near-future timestamps
2184 Egypt observes DST starting 2014-05-15 at 24:00.
2185 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2186 Details have not been announced, except that DST will not be observed
2187 during Ramadan. Guess that DST will stop during the same Ramadan dates as
2188 Morocco, and that Egypt's future spring and fall transitions will be the
2189 same as 2010 when it last observed DST, namely April's last Friday at
2190 00:00 to September's last Thursday at 23:00 standard time. Also, guess
2191 that Ramadan transitions will be at 00:00 standard time.
2193 Changes affecting code
2195 zic now generates transitions for minimum time values, eliminating guesswork
2196 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
2198 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
2200 Changes affecting commentary and documentation
2202 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
2205 Release 2014b - 2014-03-24 21:28:50 -0700
2207 Changes affecting near-future timestamps
2209 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2210 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
2212 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
2213 Bengt-Inge Larsson.) This is currently an approximation; a better version
2214 will require the zic and localtime fixes mentioned below, and the plan is
2215 to wait for a while until at least the zic fixes propagate.
2217 Changes affecting code
2219 'zic' and 'localtime' no longer reject locations needing four transitions
2220 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
2221 Also, 'zic' avoids some unlikely failures due to integer overflow.
2223 Changes affecting build procedure
2225 'make check' now detects Rule lines defined but never used.
2226 The NZAQ rules, an instance of this problem, have been removed.
2228 Changes affecting commentary and documentation
2230 Fix Tuesday/Thursday typo in description of time in Israel.
2231 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2233 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
2234 to Donald MacQueen.) Instead, the Microsoft Windows Store app
2235 library supports them.
2237 Add comments about Johnston Island time in the 1960s.
2238 (Thanks to Lyle McElhaney.)
2240 Morocco's 2014 DST start will be as predicted.
2241 (Thanks to Sebastien Willemijns.)
2244 Release 2014a - 2014-03-07 23:30:29 -0800
2246 Changes affecting near-future timestamps
2248 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
2249 the heads-up, and to Tim Parenti for simplifying the update.)
2251 Changes affecting past timestamps
2253 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2254 (Thanks to Steffen Thorsen.)
2256 Ukraine switched from Moscow to Eastern European time on 1990-07-01
2257 (not 1992-01-01), and observed DST during the entire next winter.
2258 (Thanks to Vladimir in Moscow via Alois Treindl.)
2260 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2261 (Thanks to Avigdor Finkelstein.)
2263 Changes affecting code
2265 A uninitialized-storage bug in 'localtime' has been fixed.
2266 (Thanks to Logan Chien.)
2268 Changes affecting the build procedure
2270 The settings for 'make check_web' now default to Ubuntu 13.10.
2272 Changes affecting commentary and documentation
2274 The boundary of the US Pacific time zone is given more accurately.
2275 (Thanks to Alan Mintz.)
2277 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
2279 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
2281 Better descriptions of countries with same time zone history as
2282 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
2284 Several changes affect tz-link.htm, the main web page.
2286 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2289 Mention xCal (Internet RFC 6321) and jCal.
2291 Microsoft has some support for tz database names.
2293 CLDR data formats include both XML and JSON.
2295 Mention Maggiolo's map of solar vs standard time.
2296 (Thanks to Arthur David Olson.)
2298 Mention TZ4Net. (Thanks to Matt Johnson.)
2300 Mention the timezone-olson Haskell package.
2302 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
2304 Remove moribund links to daylight-savings-time.info and to
2305 Simple Timer + Clocks.
2307 Update two links. (Thanks to Oscar van Vlijmen.)
2309 Fix some formatting glitches, e.g., remove random newlines from
2310 abbr elements' title attributes.
2313 Release 2013i - 2013-12-17 07:25:23 -0800
2315 Changes affecting near-future timestamps:
2317 Jordan switches back to standard time at 00:00 on December 20, 2013.
2318 The 2006-2011 transition schedule is planned to resume in 2014.
2319 (Thanks to Steffen Thorsen.)
2321 Changes affecting past timestamps:
2323 In 2004, Cuba began DST on March 28, not April 4.
2324 (Thanks to Steffen Thorsen.)
2326 Changes affecting code
2328 The compile-time flag NOSOLAR has been removed, as nowadays the
2329 benefit of slightly shrinking runtime table size is outweighed by the
2330 cost of disallowing potential future updates that exceed old limits.
2332 Changes affecting documentation and commentary
2334 The files solar87, solar88, and solar89 are no longer distributed.
2335 They were a negative experiment - that is, a demonstration that
2336 tz data can represent solar time only with some difficulty and error.
2337 Their presence in the distribution caused confusion, as Riyadh
2338 civil time was generally not solar time in those years.
2340 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2343 Release 2013h - 2013-10-25 15:32:32 -0700
2345 Changes affecting current and future timestamps:
2347 Libya has switched its UT offset back to +02 without DST, instead
2348 of +01 with DST. (Thanks to Even Scharning.)
2350 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2351 (Thanks to Gwillim Law.)
2353 Changes affecting future timestamps:
2355 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2356 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2357 (Thanks to Steffen Thorsen.)
2359 Add entries for DST transitions in Morocco in the year 2038.
2360 This avoids some year-2038 glitches introduced in 2013g.
2361 (Thanks to Yoshito Umaoka for reporting the problem.)
2363 Changes affecting API
2365 The 'tzselect' command no longer requires the 'select' command,
2366 and should now work with /bin/sh on more platforms. It also works
2367 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2368 Patrick 'P. J.' McDermott and Alan Barrett.)
2370 Changes affecting code
2372 Fix localtime overflow bugs with 32-bit unsigned time_t.
2374 zdump no longer assumes sscanf returns maximal values on overflow.
2376 Changes affecting the build procedure
2378 The builder can specify which programs to use, if any, instead of
2379 'ar' and 'ranlib', and libtz.a is now built locally before being
2380 installed. (Thanks to Michael Forney.)
2382 A dependency typo in the 'zdump' rule has been fixed.
2383 (Thanks to Andrew Paprocki.)
2385 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2386 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2388 'make clean' no longer removes 'leapseconds', since it's
2389 host-independent and is part of the distribution.
2391 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2393 Changes affecting documentation and commentary
2395 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2396 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2398 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2399 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2400 longer maintained) and for old advisories. SOFA now does C.
2402 Release 2013g - 2013-09-30 21:08:26 -0700
2404 Changes affecting current and near-future timestamps
2406 Morocco now observes DST from the last Sunday in March to the last
2407 Sunday in October, not April to September respectively. (Thanks
2408 to Steffen Thorsen.)
2410 Changes affecting 'zic'
2412 'zic' now runs on platforms that lack both hard links and symlinks.
2413 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2414 Also, fix some bugs on platforms that lack hard links but have symlinks.
2416 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2417 to predict the far future, fixing a bug introduced in 2013e.
2419 Changes affecting the build procedure
2421 The 'leapseconds' file is again put into the tzdata tarball.
2422 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2423 Matt Burgess and Ian Abbott.) The timestamps of these and other
2424 dependent files in tarballs are adjusted more consistently.
2426 Changes affecting documentation and commentary
2428 The README file is now part of the data tarball as well as the code.
2429 It now states that files are public domain unless otherwise specified.
2430 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2431 Its details about the 1989 release moved to a place of honor near
2435 Release 2013f - 2013-09-24 23:37:36 -0700
2437 Changes affecting near-future timestamps
2439 Tocantins will very likely not observe DST starting this spring.
2440 (Thanks to Steffen Thorsen.)
2442 Jordan will likely stay at UT +03 indefinitely, and will not fall
2445 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2447 Changes affecting API
2449 The types of the global variables 'timezone' and 'altzone' (if present)
2450 have been changed back to 'long'. This is required for 'timezone'
2451 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2452 These variables were originally 'long' in the tz code, but were
2453 mistakenly changed to 'time_t' in 1987; nobody reported the
2454 incompatibility until now. The difference matters on x32, where
2455 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2457 Changes affecting the build procedure
2459 Avoid long strings in leapseconds.awk to work around a mawk bug.
2460 (Thanks to Cyril Baurand.)
2462 Changes affecting documentation and commentary
2464 New file 'NEWS' that contains release notes like this one.
2466 Paraguay's law does not specify DST transition time; 00:00 is customary.
2467 (Thanks to Waldemar Villamayor-Venialbo.)
2469 Minor capitalization fixes.
2471 Changes affecting version-control only
2473 The experimental GitHub repository now contains annotated and
2474 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2475 Releases are tagged starting with 2012e; earlier releases were
2476 done differently, and tags would either not have a simple name or
2477 not exactly match what was released.
2479 'make set-timestamps' is now simpler and a bit more portable.
2482 Release 2013e - 2013-09-19 23:50:04 -0700
2484 Changes affecting near-future timestamps
2486 This year Fiji will start DST on October 27, not October 20.
2487 (Thanks to David Wheeler for the heads-up.) For now, guess that
2488 Fiji will continue to spring forward the Sunday before the fourth
2491 Changes affecting current and future time zone abbreviations
2493 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2494 time zone abbreviations since 1932. (Thanks to George Ziegler,
2495 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2496 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2497 Asia/Makassar, and Asia/Pontianak.
2499 Use ART (UT -03, standard time), rather than WARST (also -03, but
2500 daylight saving time) for San Luis, Argentina since 2009.
2502 Changes affecting Godthåb timestamps after 2037 if version mismatch
2504 Allow POSIX-like TZ strings where the transition time's hour can
2505 range from -167 through 167, instead of the POSIX-required 0
2506 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2507 new Fiji rules. This is a more-compact way to represent
2508 far-future timestamps for America/Godthab, America/Santiago,
2509 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2510 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2511 this change. (Derived from a suggestion by Arthur David Olson.)
2513 Allow POSIX-like TZ strings where daylight saving time is in
2514 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2515 Argentina Summer Time all year. This supports a more-compact way
2516 to represent the 2013d data for America/Argentina/San_Luis.
2517 Because of the change for San Luis noted above this change does not
2518 affect the current data. (Thanks to Andrew Main (Zefram) for
2519 suggestions that improved this change.)
2521 Where these two TZ changes take effect, there is a minor extension
2522 to the tz file format in that it allows new values for the
2523 embedded TZ-format string, and the tz file format version number
2524 has therefore been increased from 2 to 3 as a precaution.
2525 Version-2-based client code should continue to work as before for
2526 all timestamps before 2038. Existing version-2-based client code
2527 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2528 files, and typically works in practice even for timestamps after
2529 2037; the only known exception is America/Godthab.
2531 Changes affecting timestamps before 1970
2533 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2534 some errors before 1947.
2536 Some zones have been turned into links, when they differ from existing
2537 zones only in older data entries that were likely invented or that
2538 differ only in LMT or transitions from LMT. These changes affect
2539 only timestamps before 1943. The affected zones are:
2540 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2541 America/Grenada, America/Guadeloupe, America/Marigot,
2542 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2543 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2544 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2545 confirming that the old Europe/Vaduz zone was wrong and the new
2546 link is better for WWII-era times.)
2548 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2549 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2552 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2553 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2556 Change the date of the circa-1850 Zurich transition from 1849-09-12
2557 to 1853-07-16, overriding Shanks with data from Messerli about
2558 postal and telegraph time in Switzerland.
2560 Changes affecting time zone abbreviations before 1970
2562 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2563 as Jakarta was called Batavia back then.
2565 Changes affecting API
2567 The 'zic' command now outputs a dummy transition when far-future
2568 data can't be summarized using a TZ string, and uses a 402-year
2569 window rather than a 400-year window. For the current data, this
2570 affects only the Asia/Tehran file. It does not affect any of the
2571 timestamps that this file represents, so zdump outputs the same
2572 information as before. (Thanks to Andrew Main (Zefram).)
2574 The 'date' command has a new '-r' option, which lets you specify
2575 the integer time to display, a la FreeBSD.
2577 The 'tzselect' command has two new options '-c' and '-n', which lets you
2578 select a zone based on latitude and longitude.
2580 The 'zic' command's '-v' option now warns about constructs that
2581 require the new version-3 binary file format. (Thanks to Arthur
2582 David Olson for the suggestion.)
2584 Support for floating-point time_t has been removed.
2585 It was always dicey, and POSIX no longer requires it.
2586 (Thanks to Eric Blake for suggesting to the POSIX committee to
2587 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2588 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2589 bugs and elucidating some of the corners of the old floating-point
2592 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2593 changed back to the old practice of using 'long' to represent UT
2594 offsets. This had been inadvertently and mistakenly changed to
2595 'int_fast32_t'. (Thanks to Christos Zoulas.)
2597 The code avoids undefined behavior on integer overflow in some
2598 more places, including gmtime, localtime, mktime and zdump.
2600 Changes affecting the zdump utility
2602 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2603 "UTC" does not make sense for timestamps that predate the introduction
2604 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2605 for clarifying UT vs UTC.)
2607 Data changes affecting behavior of tzselect and similar programs
2609 Country code BQ is now called the more-common name "Caribbean Netherlands"
2610 rather than the more-official "Bonaire, St Eustatius & Saba".
2612 Remove from zone.tab the names America/Montreal, America/Shiprock,
2613 and Antarctica/South_Pole, as they are equivalent to existing
2614 same-country-code zones for post-1970 timestamps. The data entries for
2615 these names are unchanged, so the names continue to work as before.
2617 Changes affecting code internals
2619 zic -c now runs way faster on 64-bit hosts when given large numbers.
2621 zic now uses vfprintf to avoid allocating and freeing some memory.
2623 tzselect now computes the list of continents from the data,
2624 rather than have it hard-coded.
2626 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2628 Changes affecting the build procedure
2630 The 'leapseconds' file is now generated automatically from a
2631 new file 'leap-seconds.list', which is a copy of
2632 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2633 A new source file 'leapseconds.awk' implements this.
2634 The goal is simplification of the future maintenance of 'leapseconds'.
2636 When building the 'posix' or 'right' subdirectories, if the
2637 subdirectory would be a copy of the default subdirectory, it is
2638 now made a symbolic link if that is supported. This saves about
2639 2 MB of file system space.
2641 The links America/Shiprock and Antarctica/South_Pole have been
2642 moved to the 'backward' file. This affects only nondefault builds
2643 that omit 'backward'.
2645 Changes affecting version-control only
2647 .gitignore now ignores 'date'.
2649 Changes affecting documentation and commentary
2651 Changes to the 'tzfile' man page
2653 It now mentions that the binary file format may be extended in
2654 future versions by appending data.
2656 It now refers to the 'zdump' and 'zic' man pages.
2658 Changes to the 'zic' man page
2660 It lists conditions that elicit a warning with '-v'.
2662 It says that the behavior is unspecified when duplicate names
2663 are given, or if the source of one link is the target of another.
2665 Its examples are updated to match the latest data.
2667 The definition of white space has been clarified slightly.
2668 (Thanks to Michael Deckers.)
2670 Changes to the 'Theory' file
2672 There is a new section about the accuracy of the tz database,
2673 describing the many ways that errors can creep in, and
2674 explaining why so many of the pre-1970 timestamps are wrong or
2675 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2676 Wollman for discussions that contributed to this).
2678 The 'Theory' file describes LMT better (this follows a
2679 suggestion by Guy Harris).
2681 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2683 It's mentioned that excluding 'backward' should not affect the
2684 other data, and it suggests at least one zone.tab name per
2685 inhabited country (thanks to Stephen Colebourne).
2687 Some longstanding restrictions on names are documented, e.g.,
2688 'America/New_York' precludes 'America/New_York/Bronx'.
2690 It gives more reasons for the 1970 cutoff.
2692 It now mentions which time_t variants are supported, such as
2693 signed integer time_t. (Thanks to Paul Goyette for reporting
2694 typos in an experimental version of this change.)
2696 (Thanks to Philip Newton for correcting typos in these changes.)
2698 Documentation and commentary is more careful to distinguish UT in
2699 general from UTC in particular. (Thanks to Steve Allen.)
2701 Add a better source for the Zurich 1894 transition.
2702 (Thanks to Pierre-Yves Berger.)
2704 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2707 Release 2013d - 2013-07-05 07:38:01 -0700
2709 Changes affecting future timestamps:
2711 Morocco's midsummer transitions this year are July 7 and August 10,
2712 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2714 Israel now falls back on the last Sunday of October.
2715 (Thanks to Ephraim Silverberg.)
2717 Changes affecting past timestamps:
2719 Specify Jerusalem's location more precisely; this changes the pre-1880
2722 Changing affecting metadata only:
2724 Fix typos in the entries for country codes BQ and SX.
2726 Changes affecting code:
2728 Rework the code to fix a bug with handling Australia/Macquarie on
2729 32-bit hosts (thanks to Arthur David Olson).
2731 Port to platforms like NetBSD, where time_t can be wider than long.
2733 Add support for testing time_t types other than the system's.
2734 Run 'make check_time_t_alternatives' to try this out.
2735 Currently, the tests fail for unsigned time_t;
2736 this should get fixed at some point.
2738 Changes affecting documentation and commentary:
2740 Deemphasize the significance of national borders.
2742 Update the zdump man page.
2744 Remove obsolete NOID comment (thanks to Denis Excoffier).
2746 Update several URLs and comments in the web pages.
2748 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2750 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2753 Release 2013c - 2013-04-19 16:17:40 -0700
2755 Changes affecting current and future timestamps:
2757 Palestine observed DST starting March 29, 2013. (Thanks to
2758 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2759 with the predicted rules being the last Thursday in March at 24:00
2760 to the first Friday on or after September 21 at 01:00.
2762 Assume that the recent change to Paraguay's DST rules is permanent,
2763 by moving the end of DST to the 4th Sunday in March every year.
2764 (Thanks to Carlos Raúl Perasso.)
2766 Changes affecting past timestamps:
2768 Fix some historical data for Palestine to agree with that of
2769 timeanddate.com, as follows:
2771 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2774 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2777 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2779 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2781 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2783 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2785 Fix times of habitation for Macquarie to agree with the Tasmania
2786 Parks & Wildlife Service history, which indicates that permanent
2787 habitation was 1899-1919 and 1948 on.
2789 Changing affecting metadata only:
2791 Macquarie Island is politically part of Australia, not Antarctica.
2792 (Thanks to Tobias Conradi.)
2794 Sort Macquarie more-consistently with other parts of Australia.
2795 (Thanks to Tim Parenti.)
2798 Release 2013b - 2013-03-10 22:33:40 -0700
2800 Changes affecting current and future timestamps:
2802 Haiti uses US daylight-saving rules this year, and presumably future years.
2803 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2805 Paraguay will end DST on March 24 this year.
2806 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2808 Morocco does not observe DST during Ramadan;
2809 try to predict Ramadan in Morocco as best we can.
2810 (Thanks to Erik Homoet for the heads-up.)
2812 Changes affecting commentary:
2814 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2815 Update URL for Solaris. Mention Internet RFC 6557.
2816 Update Internet RFCs 2445->5545, 2822->5322.
2817 Switch from FTP to HTTP for Internet RFCs.
2820 Release 2013a - 2013-02-27 09:20:35 -0800
2822 Change affecting binary data format:
2824 The zone offset at the end of version-2-format zone files is now
2825 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2827 Changes affecting current and future timestamps:
2829 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2830 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2831 (Thanks to Steffen Thorsen and Robert Elz.)
2833 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2834 (Thanks to Tobias Conradi and Arthur David Olson.)
2836 Many changes affect historical timestamps before 1940.
2837 These were deduced from: Milne J. Civil time. Geogr J. 1899
2838 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2840 Changes affecting the code:
2842 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2843 the data). (Thanks to Arthur David Olson.)
2845 Fix localtime bug when time_t is unsigned and data files were generated
2846 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2847 to Arthur David Olson for fixing.)
2849 Allow the email address for bug reports to be set by the packager.
2850 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2852 Update HTML checking to be compatible with Ubuntu 12.10.
2854 Check that files are a safe subset of ASCII. At some point we may
2855 relax this requirement to a safe subset of UTF-8. Without the
2856 check, some non-UTF-8 encodings were leaking into the distribution.
2860 Restore a comment about copyright notices that was inadvertently deleted.
2861 (Thanks to Arthur David Olson.)
2863 Improve the commentary about which districts observe what times
2864 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2866 Add web page links to tz.js.
2868 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2871 Release 2012j - 2012-11-12 18:34:49 -0800
2873 Libya moved to CET this weekend, but with DST planned next year.
2874 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2876 Signatures now have the extension .asc, not .sign, as that's more
2877 standard. (Thanks to Phil Pennock.)
2879 The output of 'zdump --version', and of 'zic --version', now
2880 uses a format that is more typical for --version.
2881 (Thanks to Joseph S. Myers.)
2883 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2884 now uses tz@iana.org rather than the old elsie address.
2886 zic -v now complains about abbreviations that are less than 3
2887 or more than 6 characters, as per Posix. Formerly, it checked
2888 for abbreviations that were more than 3.
2890 'make public' no longer puts its temporary directory under /tmp,
2891 and uses the just-built zic rather than the system zic.
2893 Various fixes to documentation and commentary.
2896 Release 2012i - 2012-11-03 12:57:09 -0700
2898 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2900 Linker flags can now be specified via LDFLAGS.
2901 AWK now defaults to 'awk', not 'nawk'.
2902 The shell in tzselect now defaults to /bin/bash, but this can
2903 be overridden by specifying KSHELL.
2904 The main web page now mentions the unofficial GitHub repository.
2905 (Thanks to Mike Frysinger.)
2907 Tarball signatures can now be built by running 'make signatures'.
2908 There are also new makefile rules 'tarballs', 'check_public', and
2909 separate makefile rules for each tarball and signature file.
2910 A few makefile rules are now more portable to strict POSIX.
2912 The main web page now lists the canonical IANA URL.
2915 Release 2012h - 2012-10-26 22:49:10 -0700
2917 Bahia no longer has DST. (Thanks to Kelley Cook.)
2919 Tocantins has DST. (Thanks to Rodrigo Severo.)
2921 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2923 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2927 More C modernization, except that at Arthur David Olson's suggestion
2928 the instances of 'register' were kept.
2931 Release 2012g - 2012-10-17 20:59:45 -0700
2933 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2935 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2939 To attack the version-number problem, this release ships the file
2940 'Makefile' (which contains the release number) in both the tzcode and
2941 the tzdata tarballs. The two Makefiles are identical, and should be
2942 identical in any matching pair of tarballs, so it shouldn't matter
2943 which order you extract the tarballs. Perhaps we can come up with a
2944 better version-number scheme at some point; this scheme does have the
2945 virtue of not adding more files.
2948 Release 2012f - 2012-09-12 23:17:03 -0700
2950 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2951 20 this year. (Thanks to Steffen Thorsen.)
2954 Release 2012e - 2012-08-02 20:44:55 -0700
2956 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2957 (Thanks to Steffen Thorsen.)
2959 * Use a single version number for both code and data.
2961 * .gitignore: New file.
2963 * Remove trailing white space.
2966 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2968 Changes for Morocco's timestamps, which take effect in a couple of
2969 hours, along with infrastructure changes to accommodate how the tz
2970 code and data are released on IANA.
2973 Release data2012c - 2012-03-27 12:17:25 -0400
2976 Summer time changes for Morocco (to start late April 2012)
2979 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2982 Haiti following US/Canada rules for 2012 (and we're assuming,
2983 for now anyway, for the future).
2986 Release 2012b - 2012-03-02 12:29:15 +0700
2988 There is just one change to tzcode2012b (compared with 2012a):
2989 the Makefile that was accidentally included with 2012a has been
2990 replaced with the version that should have been there, which is
2991 identical with the previous version (from tzcode2011i).
2993 There are just two changes in tzdata2012b compared with 2012a.
2995 Most significantly, summer time in Cuba has been delayed 3 weeks
2996 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2997 date, as listed in 2012a) is just a little over a week away, this
3000 Less importantly, an excess tab in one of the changes in zone.tab
3001 in 2012a has been removed.
3004 Release 2012a - 2012-03-01 18:28:10 +0700
3006 The changes in tzcode2012a (compared to the previous version, 2011i)
3007 are entirely to the README and tz-art.htm and tz-link.htm files, if
3008 none of those concern you, you can ignore the code update. The changes
3009 reflect the changed addresses for the mailing list and the code and
3010 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
3011 has been added to tz-link.htm).
3013 In tzdata2012a (compared to the previous release, which was 2011n)
3014 the major changes are:
3015 Chile 2011/2012 and 2012/2013 summer time date adjustments.
3016 Falkland Islands onto permanent summer time (we're assuming for the
3017 foreseeable future, though 2012 is all we're fairly certain of.)
3018 Armenia has abolished Summer Time.
3019 Tokelau jumped the International Date Line back last December
3020 (just the same as their near neighbour, Samoa).
3021 America/Creston is a new zone for a small area of British Columbia
3022 There will be a leapsecond 2012-06-30 23:59:60 UTC.
3024 Other minor changes are:
3025 Corrections to 1918 Canadian summer time end dates.
3026 Updated URL for UK time zone history (in comments)
3027 A few typos in Le Corre's list of free French place names (comments)
3030 Release data2011n - 2011-10-30 14:57:54 +0700
3032 There are three changes of note - most urgently, Cuba (America/Havana)
3033 has extended summer time by two weeks, now to end on Nov 13, rather than
3034 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
3035 (Europe/Tiraspol) decided not to split from the rest of Moldova after
3036 all, and consequently that zone has been removed (again) and reinstated
3037 in the "backward" file as a link to Europe/Chisinau. And third, the
3038 end date for Fiji's summer time this summer was moved forward from the
3039 earlier planned Feb 26, to Jan 22.
3041 Apart from that, Moldova (MD) returns to a single entry in zone.tab
3042 (and the incorrect syntax that was in the 2011m version of that file
3043 is so fixed - it would have been fixed in a different way had this
3044 change not happened - that's the "missing" sccs version id).
3047 Release data2011m - 2011-10-24 21:42:16 +0700
3049 In particular, the typos in comments in the data (2011-11-17 should have
3050 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
3051 Tim Parenti noted) have been fixed, and the change for Ukraine has been
3052 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
3053 Tim Parenti, and also Denys Gavrysh)
3055 In addition, I added Europe/Tiraspol to zone.tab.
3057 This time, all the files have new version numbers... (including the files
3058 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
3059 version numbers there...)
3062 Release data2011l - 2011-10-10 11:15:43 +0700
3064 There are just 2 changes that cause different generated tzdata files from
3065 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
3066 is included, but commented out. Compared with the diff I sent out last week,
3067 this version also includes attributions for the sources for the changes
3068 (in much the same format as ado used, but the html tags have not been
3069 checked, verified, or used in any way at all, so if there are errors there,
3070 please let me know.)
3073 Release data2011k - 2011-09-20 17:54:03 -0400
3078 Release data2011j - 2011-09-12 09:22:49 -0400
3080 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
3081 Tanzania); there are also two spelling corrections to comments in
3082 the australasia file (with thanks to Christos Zoulas).
3085 Release 2011i - 2011-08-29 05:56:32 -0400
3090 Release data2011h - 2011-06-15 18:41:48 -0400
3092 Russia and Curaçao changes
3095 Release 2011g - 2011-04-25 09:07:22 -0400
3097 update the rules for Egypt to reflect its abandonment of DST this year
3100 Release 2011f - 2011-04-06 17:14:53 -0400
3105 Release 2011e - 2011-03-31 16:04:38 -0400
3107 Morocco, Chile, and tz-link changes
3110 Release 2011d - 2011-03-14 09:18:01 -0400
3112 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
3115 Release 2011c - 2011-03-07 09:30:09 -0500
3117 These do affect current timestamps in Chile and Annette Island, Canada.
3120 Release 2011b - 2011-02-07 08:44:50 -0500
3125 Release 2011a - 2011-01-24 10:30:16 -0500
3130 Release data2010o - 2010-11-01 09:18:23 -0400
3132 change to the end of DST in Fiji in 2011
3135 Release 2010n - 2010-10-25 08:19:17 -0400
3140 Release 2010m - 2010-09-27 09:24:48 -0400
3142 Hong Kong, Vostok, and zic.c changes
3145 Release 2010l - 2010-08-16 06:57:25 -0400
3150 Release 2010k - 2010-07-26 10:42:27 -0400
3155 Release 2010j - 2010-05-10 09:07:48 -0400
3157 changes for Bahía de Banderas and for version naming
3160 Release data2010i - 2010-04-16 18:50:45 -0400
3162 the end of DST in Morocco on 2010-08-08
3165 Release data2010h - 2010-04-05 09:58:56 -0400
3170 Release data2010g - 2010-03-24 11:14:53 -0400
3175 Release 2010f - 2010-03-22 09:45:46 -0400
3180 Release data2010e - 2010-03-08 14:24:27 -0500
3182 corrects the Dhaka bug found by Danvin Ruangchan
3185 Release data2010d - 2010-03-06 07:26:01 -0500
3190 Release 2010c - 2010-03-01 09:20:58 -0500
3192 changes including KRE's suggestion for earlier initialization of
3193 "goahead" and "goback" structure elements
3196 Release code2010a - 2010-02-16 10:40:04 -0500
3201 Release data2010b - 2010-01-20 12:37:01 -0500
3206 Release data2010a - 2010-01-18 08:30:04 -0500
3211 Release data2009u - 2009-12-26 08:32:28 -0500
3213 changes to DST in Bangladesh
3216 Release 2009t - 2009-12-21 13:24:27 -0500
3221 Release data2009s - 2009-11-14 10:26:32 -0500
3223 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3226 Release 2009r - 2009-11-09 10:10:31 -0500
3228 "antarctica" and "tz-link.htm" changes
3231 Release 2009q - 2009-11-02 09:12:40 -0500
3233 with two corrections as reported by Eric Muller and Philip Newton
3236 Release data2009p - 2009-10-23 15:05:27 -0400
3238 Argentina (including San Luis) changes (with the correction from
3242 Release data2009o - 2009-10-14 16:49:38 -0400
3244 Samoa (commentary only), Pakistan, and Bangladesh changes
3247 Release data2009n - 2009-09-22 15:13:38 -0400
3249 added commentary for Argentina and a change to the end of DST in
3253 Release data2009m - 2009-09-03 10:23:43 -0400
3255 Samoa and Palestine changes
3258 Release data2009l - 2009-08-14 09:13:07 -0400
3260 Samoa (comments only) and Egypt
3263 Release 2009k - 2009-07-20 09:46:08 -0400
3268 Release data2009j - 2009-06-15 06:43:59 -0400
3270 Bangladesh change (with a short turnaround since the DST change is
3274 Release 2009i - 2009-06-08 09:21:22 -0400
3276 updating for DST in Bangladesh this year
3279 Release 2009h - 2009-05-26 09:19:14 -0400
3284 Release data2009g - 2009-04-20 16:34:07 -0400
3289 Release data2009f - 2009-04-10 11:00:52 -0400
3291 correct DST in Pakistan
3294 Release 2009e - 2009-04-06 09:08:11 -0400
3299 Release 2009d - 2009-03-23 09:38:12 -0400
3301 Morocco, Tunisia, Argentina, and American Astronomical Society changes
3304 Release data2009c - 2009-03-16 09:47:51 -0400
3306 change to the start of Cuban DST
3309 Release 2009b - 2009-02-09 11:15:22 -0500
3314 Release 2009a - 2009-01-21 10:09:39 -0500
3319 Release data2008i - 2008-10-21 12:10:25 -0400
3321 southamerica and zone.tab files, with Argentina DST rule changes and
3322 United States zone reordering and recommenting
3325 Release 2008h - 2008-10-13 07:33:56 -0400
3330 Release 2008g - 2008-10-06 09:03:18 -0400
3332 Fix a broken HTML anchor and update Brazil's DST transitions;
3333 there's also a slight reordering of information in tz-art.htm.
3336 Release data2008f - 2008-09-09 22:33:26 -0400
3341 Release 2008e - 2008-07-28 14:11:17 -0400
3343 changes by Arthur David Olson and Jesper Nørgaard Welen
3346 Release data2008d - 2008-07-07 09:51:38 -0400
3348 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3351 Release data2008c - 2008-05-19 17:48:03 -0400
3353 Pakistan, Morocco, and Mongolia
3356 Release data2008b - 2008-03-24 08:30:59 -0400
3358 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3362 Release 2008a - 2008-03-08 05:42:16 -0500
3367 Release 2007k - 2007-12-31 10:25:22 -0500
3369 most importantly, changes to the "southamerica" file based on
3370 Argentina's readoption of daylight saving time
3373 Release 2007j - 2007-12-03 09:51:01 -0500
3375 1. eliminate the "P" (parameter) macro;
3377 2. the "noncontroversial" changes circulated on the time zone
3378 mailing list (less the changes to "logwtmp.c");
3380 3. eliminate "too many transition" errors when "min" is used in time
3383 4. changes by Paul Eggert (including updated information for Venezuela).
3386 Release data2007i - 2007-10-30 10:28:11 -0400
3388 changes for Cuba and Syria
3391 Release 2007h - 2007-10-01 10:05:51 -0400
3393 changes by Paul Eggert, as well as an updated link to the ICU
3394 project in tz-link.htm
3397 Release 2007g - 2007-08-20 10:47:59 -0400
3399 changes by Paul Eggert
3401 The "leapseconds" file has been updated to incorporate the most
3402 recent International Earth Rotation and Reference Systems Service
3405 There's an addition to tz-art.htm regarding the television show "Medium".
3408 Release 2007f - 2007-05-07 10:46:46 -0400
3410 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3413 changes to zic.c to allow hour values greater than 24 (along with
3414 Paul's improved time value overflow checking)
3417 Release 2007e - 2007-04-02 10:11:52 -0400
3419 Syria and Honduras changes by Paul Eggert
3421 zic.c variable renaming changes by Arthur David Olson
3424 Release 2007d - 2007-03-20 08:48:30 -0400
3426 changes by Paul Eggert
3428 the elimination of white space at the ends of lines
3431 Release 2007c - 2007-02-26 09:09:37 -0500
3433 changes by Paul Eggert
3436 Release 2007b - 2007-02-12 09:34:20 -0500
3438 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3440 changes to the commentary in "leapseconds" reflecting the IERS
3441 announcement that there is to be no positive leap second at the end
3445 Release 2007a - 2007-01-08 12:28:29 -0500
3447 changes by Paul Eggert
3449 Derick Rethan's Asmara change
3451 Oscar van Vlijmen's Easter Island local mean time change
3453 symbolic link changes
3456 Release 2006p - 2006-11-27 08:54:27 -0500
3458 changes by Paul Eggert
3461 Release 2006o - 2006-11-06 09:18:07 -0500
3463 changes by Paul Eggert
3466 Release 2006n - 2006-10-10 11:32:06 -0400
3468 changes by Paul Eggert
3471 Release 2006m - 2006-10-02 15:32:35 -0400
3473 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3475 (minimalist) changes to zic.8 to clarify "until" information
3478 Release data2006l - 2006-09-18 12:58:11 -0400
3480 Paul's best-effort work on this coming weekend's Egypt time change
3483 Release 2006k - 2006-08-28 12:19:09 -0400
3485 changes by Paul Eggert
3488 Release 2006j - 2006-08-21 09:56:32 -0400
3490 changes by Paul Eggert
3493 Release code2006i - 2006-08-07 12:30:55 -0400
3497 Ken Pizzini's conversion script
3500 Release code2006h - 2006-07-24 09:19:37 -0400
3502 adds public domain notices to four files
3504 includes a fix for transition times being off by a second
3506 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3509 Release 2006g - 2006-05-08 17:18:09 -0400
3511 northamerica changes by Paul Eggert
3514 Release 2006f - 2006-05-01 11:46:00 -0400
3516 a missing version number problem is fixed (with thanks to Bradley
3517 White for catching the problem)
3520 Release 2006d - 2006-04-17 14:33:43 -0400
3522 changes by Paul Eggert
3524 added new items to tz-arts.htm that were found by Paul
3527 Release 2006c - 2006-04-03 10:09:32 -0400
3529 two sets of data changes by Paul Eggert
3531 a fencepost error fix in zic.c
3533 changes to zic.c and the "europe" file to minimize differences
3534 between output produced by the old 32-bit zic and the new 64-bit
3538 Release 2006b - 2006-02-20 10:08:18 -0500
3539 [tz32code2006b + tz64code2006b + tzdata2006b]
3543 All SCCS IDs were bumped to "8.1" for this release.
3546 Release 2006a - 2006-01-30 08:59:31 -0500
3548 changes by Paul Eggert (in particular, Indiana time zone moves)
3550 an addition to the zic manual page to describe how special-case
3551 transitions are handled
3554 Release 2005r - 2005-12-27 09:27:13 -0500
3556 Canadian changes by Paul Eggert
3558 They also add "<pre>" directives to time zone data files and reflect
3559 changes to warning message logic in "zdump.c" (but with calls to
3560 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3563 Release 2005q - 2005-12-13 09:17:09 -0500
3565 Nothing earth-shaking here:
3566 1. Electronic mail addresses have been removed.
3567 2. Casts of the return value of exit have been removed.
3568 3. Casts of the argument of is.* macros have been added.
3569 4. Indentation in one section of zic.c has been fixed.
3570 5. References to dead URLs in the data files have been dealt with.
3573 Release 2005p - 2005-12-05 10:30:53 -0500
3575 "systemv", "tz-link.htm", and "zdump.c" changes
3576 (less the casts of arguments to the is* macros)
3579 Release 2005o - 2005-11-28 10:55:26 -0500
3581 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3583 zdump.c lint fixes by Arthur David Olson
3586 Release 2005n - 2005-10-03 09:44:09 -0400
3588 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3592 Release 2005m - 2005-08-29 12:15:40 -0400
3594 changes by Paul Eggert (with a small tweak to the tz-art change)
3596 a declaration of an unused variable has been removed from zdump.c
3599 Release 2005l - 2005-08-22 12:06:39 -0400
3601 changes by Paul Eggert
3603 overflow/underflow checks by Arthur David Olson, minus changes to
3604 the "Theory" file about the pending addition of 64-bit data (I grow
3605 less confident of the changes being accepted with each passing day,
3606 and the changes no longer increase the data files nine-fold--there's
3607 less than a doubling in size by my local Sun's reckoning)
3610 Release 2005k - 2005-07-14 14:14:24 -0400
3612 The "leapseconds" file has been edited to reflect the recently
3613 announced leap second at the end of 2005.
3615 I've also deleted electronic mail addresses from the files as an
3619 Release 2005j - 2005-06-13 14:34:13 -0400
3621 These reflect changes to limit the length of time zone abbreviations
3622 and the characters used in those abbreviations.
3624 There are also changes to handle POSIX-style "quoted" timezone
3625 environment variables.
3627 The changes were circulated on the time zone mailing list; the only
3628 change since then was the removal of a couple of minimum-length of
3629 abbreviation checks.
3632 Release data2005i - 2005-04-21 15:04:16 -0400
3634 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3637 Release 2005h - 2005-04-04 11:24:47 -0400
3639 changes by Paul Eggert
3641 minor changes to Makefile and zdump.c to produce more useful output
3642 when doing a "make typecheck"
3645 Release 2005g - 2005-03-14 10:11:21 -0500
3647 changes by Paul Eggert (a change to current DST rules in Uruguay and
3648 an update to a link to time zone software)
3651 Release 2005f - 2005-03-01 08:45:32 -0500
3653 data and documentation changes by Paul Eggert
3656 Release 2005e - 2005-02-10 15:59:44 -0500
3661 Release code2005d - 2005-01-31 09:21:47 -0500
3663 make zic complain about links to links if the -v flag is used
3665 have "make public" do more code checking
3667 add an include to "localtime.c" for the benefit of gcc systems
3670 Release 2005c - 2005-01-17 18:36:29 -0500
3672 get better results when mktime runs on a system where time_t is double
3674 changes to the data files (most importantly to Paraguay)
3677 Release 2005b - 2005-01-10 09:19:54 -0500
3679 Get localtime and gmtime working on systems with exotic time_t types.
3681 Update the leap second commentary in the "leapseconds" file.
3684 Release 2005a - 2005-01-01 13:13:44 -0500
3689 Release code2004i - 2004-12-14 13:42:58 -0500
3691 Deal with systems where time_t is unsigned.
3694 Release code2004h - 2004-12-07 11:40:18 -0500
3696 64-bit-time_t changes
3699 Release 2004g - 2004-11-02 09:06:01 -0500
3701 update to Cuba (taking effect this weekend)
3703 other changes by Paul Eggert
3705 correction of the spelling of Oslo
3707 changed versions of difftime.c and private.h
3710 Release code2004f - 2004-10-21 10:25:22 -0400
3712 Cope with wide-ranging tm_year values.
3715 Release 2004e - 2004-10-11 14:47:21 -0400
3717 Brazil/Argentina/Israel changes by Paul Eggert
3719 changes to tz-link.htm by Paul
3721 one small fix to Makefile
3724 Release 2004d - 2004-09-22 08:27:29 -0400
3726 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3729 Release 2004c - 2004-08-11 12:06:26 -0400
3731 asctime-related changes
3733 (variants of) some of the documentation changes suggested by Paul Eggert
3736 Release 2004b - 2004-07-19 14:33:35 -0400
3738 data changes by Paul Eggert - most importantly, updates for Argentina
3741 Release 2004a - 2004-05-27 12:00:47 -0400
3743 changes by Paul Eggert
3745 Handle DST transitions that occur at the end of a month in some
3746 years but at the start of the following month in other years.
3748 Add a copy of the correspondence that's the basis for claims about
3749 DST in the Navajo Nation.
3752 Release 2003e - 2003-12-15 09:36:47 -0500
3754 changes by Arthur David Olson (primarily code changes)
3756 changes by Paul Eggert (primarily data changes)
3758 minor changes to "Makefile" and "northamerica" (in the latter case,
3759 optimization of the "Toronto" rules)
3762 Release 2003d - 2003-10-06 09:34:44 -0400
3764 changes by Paul Eggert
3767 Release 2003c - 2003-09-16 10:47:05 -0400
3769 Fix bad returns in zic.c's inleap function.
3770 Thanks to Bradley White for catching the problem!
3773 Release 2003b - 2003-09-16 07:13:44 -0400
3775 Add a "--version" option (and documentation) to the zic and zdump commands.
3777 changes to overflow/underflow checking in zic
3779 a localtime typo fix.
3781 Update the leapseconds and tz-art.htm files.
3784 Release 2003a - 2003-03-24 09:30:54 -0500
3786 changes by Paul Eggert
3788 a few additions and modifications to the tz-art.htm file
3791 Release 2002d - 2002-10-15 13:12:42 -0400
3793 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3795 There's also a new time zone quote in "tz-art.htm".
3798 Release 2002c - 2002-04-04 11:55:20 -0500
3800 changes by Paul Eggert
3802 Change zic.c to avoid creating symlinks to files that don't exist.
3805 Release 2002b - 2002-01-28 12:56:03 -0500
3807 [These change notes are for Release 2002a, which was corrupted.
3808 2002b was a corrected version of 2002a.]
3810 changes by Paul Eggert
3812 Update the "leapseconds" file to note that there'll be no leap
3813 second at the end of June, 2002.
3815 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3817 Change to "difftime.c" to avoid sizeof problems.
3820 Release 2001d - 2001-10-09 13:31:32 -0400
3822 changes by Paul Eggert
3825 Release 2001c - 2001-06-05 13:59:55 -0400
3827 changes by Paul Eggert and Andrew Brown
3830 Release 2001b - 2001-04-05 16:44:38 -0400
3832 changes by Paul Eggert (modulo jnorgard's typo fix)
3834 tz-art.htm has been HTMLified.
3837 Release 2001a - 2001-03-13 12:57:44 -0500
3839 changes by Paul Eggert
3841 An addition to the "leapseconds" file: comments with the text of the
3842 latest IERS leap second notice.
3844 Trailing white space has been removed from data file lines, and
3845 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3849 Release 2000h - 2000-12-14 15:33:38 -0500
3851 changes by Paul Eggert
3853 one typo fix in the "art" file
3855 With providence, this is the last update of the millennium.
3858 Release 2000g - 2000-10-10 11:35:22 -0400
3860 changes by Paul Eggert
3862 correction of John Mackin's name submitted by Robert Elz
3864 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3865 Emmy Awards broadcast.
3868 Release 2000f - 2000-08-10 09:31:58 -0400
3870 changes by Paul Eggert
3872 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3874 Error checking and messages in the "yearistype" script have been
3878 Release 2000e - 2000-07-31 09:27:54 -0400
3880 data changes by Paul Eggert
3882 a change to the default value of the defined constant HAVE_STRERROR
3884 the addition of a Dave Barry quote on DST to the tz-arts file
3887 Release 2000d - 2000-04-20 15:43:04 -0400
3889 changes to the documentation and code of strftime for C99 conformance
3891 a bug fix for date.c
3893 These are based on (though modified from) changes by Paul Eggert.
3896 Release 2000c - 2000-03-04 10:31:43 -0500
3898 changes by Paul Eggert
3901 Release 2000b - 2000-02-21 12:16:29 -0500
3903 changes by Paul Eggert and Joseph Myers
3905 modest tweaks to the tz-art.htm and tz-link.htm files
3908 Release 2000a - 2000-01-18 09:21:26 -0500
3910 changes by Paul Eggert
3912 The two hypertext documents have also been renamed.
3915 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3917 Paul Eggert's changes
3919 additions to the "zic" manual page and the "Arts.htm" file
3922 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3927 Release data1999h - 1999-10-07 03:50:29 -0400
3929 changes by Paul Eggert to "europe" (most importantly, fixing
3930 Lithuania and Estonia)
3933 Release 1999g - 1999-09-28 11:06:18 -0400
3935 data changes by Paul Eggert (most importantly, the change for
3936 Lebanon that buys correctness for this coming Sunday)
3938 The "code" file contains changes to "Makefile" and "checktab.awk" to
3939 allow better checking of time zone files before they are published.
3942 Release 1999f - 1999-09-23 09:48:14 -0400
3944 changes by Arthur David Olson and Paul Eggert
3947 Release 1999e - 1999-08-17 15:20:54 -0400
3949 changes circulated by Paul Eggert, although the change to handling
3950 of DST-specifying timezone names has been commented out for now
3951 (search for "XXX" in "localtime.c" for details). These files also
3952 do not make any changes to the start of DST in Brazil.
3954 In addition to Paul's changes, there are updates to "Arts.htm" and
3958 Release 1999d - 1999-03-30 11:31:07 -0500
3960 changes by Paul Eggert
3962 The Makefile's "make public" rule has also been changed to do a test
3963 compile of each individual time zone data file (which should help
3964 avoid problems such as the one we had with Nicosia).
3967 Release 1999c - 1999-03-25 09:47:47 -0500
3969 changes by Paul Eggert, most importantly the change for Chile.
3972 Release 1999b - 1999-02-01 17:51:44 -0500
3974 changes by Paul Eggert
3976 code changes (suggested by Mani Varadarajan, mani at be.com) for
3977 correct handling of symbolic links when building using a relative directory
3979 code changes to generate correct messages for failed links
3981 updates to the URLs in Arts.htm
3984 Release 1999a - 1999-01-19 16:20:29 -0500
3986 error message internationalizations and corrections in zic.c and
3987 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3991 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3993 changes for Brazil, Chile, and Germany
3995 support for use of "24:00" in the input files for the time zone compiler
3998 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
4000 changes by Paul Eggert
4002 correction to a define in the "private.h" file
4005 Release data1998g - 1998-08-11 03:28:35 -0000
4006 [tzdata1998g.tar.gz is missing!]
4008 Lithuanian change provided by mgedmin at pub.osf.it
4010 Move creation of the GMT link with Etc/GMT to "etcetera" (from
4011 "backward") to ensure that the GMT file is created even where folks
4012 don't want the "backward" links (as suggested by Paul Eggert).
4015 Release data1998f - 1998-07-20 13:50:00 -0000
4016 [tzdata1998f.tar.gz is missing!]
4018 Update the "leapseconds" file to include the newly-announced
4019 insertion at the end of 1998.
4022 Release code1998f - 1998-06-01 10:18:31 -0400
4024 addition to localtime.c by Guy Harris
4027 Release 1998e - 1998-05-28 09:56:26 -0400
4029 The Makefile is changed to produce zoneinfo-posix rather than
4030 zoneinfo/posix, and to produce zoneinfo-leaps rather than
4033 data changes by Paul Eggert
4035 changes from Guy Harris to provide asctime_r and ctime_r
4037 A usno1998 file (substantially identical to usno1997) has been added.
4040 Release 1998d - 1998-05-14 11:58:34 -0400
4042 changes to comments (in particular, elimination of references to CIA maps).
4043 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
4044 where changes occur.
4047 Release 1998c - 1998-02-28 12:32:26 -0500
4049 changes by Paul Eggert (save the "French correction," on which I'll
4050 wait for the dust to settle)
4054 changes and additions to Arts.htm
4057 Release 1998b - 1998-01-17 14:31:51 -0500
4059 URL cleanups and additions
4062 Release 1998a - 1998-01-13 12:37:35 -0500
4064 changes by Paul Eggert
4067 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
4069 changes by Paul Eggert, with minor modifications from Arthur David
4070 Olson to make the files more browser friendly
4073 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
4075 minor changes to put "TZif" at the start of each timezone information file
4077 a rule has also been added to the Makefile so you can
4079 to just recompile the zone information files (rather than doing a
4080 full "make install" with its other effects).
4083 Release data1997i - 1997-10-07 08:45:38 -0400
4085 changes to Africa by Paul Eggert
4088 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
4090 corrections for Uruguay (and other locations)
4092 Arthur David Olson's simple-minded fix allowing mktime to both
4093 correctly handle leap seconds and correctly handle tm_sec values
4094 upon which arithmetic has been performed.
4097 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
4099 Paul Eggert's updates
4101 a small change to a function prototype;
4103 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
4104 include information on Around the World in Eighty Days.
4107 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
4109 fixes to zic's error handling
4111 changes inspired by the item circulated on Slovenia
4113 The description of Web resources has been HTMLified for browsing
4116 A new piece of tz-related music has been added to the "Music" file.
4119 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
4121 Paul Eggert's latest suggestions
4124 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
4126 changes to "zic.c" to correct performance of the "-s" option
4128 a new file "usno1997"
4131 Release data1997c - 1997-03-04 09:58:18 -0500
4136 Release 1997b - 1997-02-27 18:34:19 -0500
4138 The data file incorporates the 1997 leap second.
4140 The code file incorporates Arthur David Olson's take on the
4141 zic/multiprocessor/directory-creation situation.
4144 Release 1997a - 1997-01-21 09:11:10 -0500
4146 Paul Eggert's Antarctica (and other changes)
4148 Arthur David Olson finessed the "getopt" issue by checking against
4149 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4150 is returned while SunOS 5.5's manual says EOF is returned).
4153 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4155 Paul Eggert's latest changes
4158 Release code1996n - 1996-12-16 09:42:02 -0500
4160 link snapping fix from Bruce Evans (via Garrett Wollman)
4163 Release data1996m - 1996-11-24 02:37:34 -0000
4164 [tzdata1996m.tar.gz is missing!]
4166 Paul Eggert's batch of changes
4169 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4171 No functional changes here; the files have simply been changed to
4172 make more use of ISO style dates in comments. The names of the above
4173 files now include the year in full.
4176 Release code96l - 1996-09-08 17:12:20 -0400
4178 tzcode96k was missing a couple of pieces.
4181 Release 96k - 1996-09-08 16:06:22 -0400
4183 the latest round of changes from Paul Eggert
4185 the recent Year 2000 material
4188 Release code96j - 1996-07-30 13:18:53 -0400
4190 Set sp->typecnt as suggested by Timothy Patrick Murphy.
4193 Release code96i - 1996-07-27 20:11:35 -0400
4195 Paul's suggested patch for strftime %V week numbers
4198 Release data96i - 1996-07-01 18:13:04 -0400
4200 "northamerica" and "europe" changes by Paul Eggert
4203 Release code96h - 1996-06-05 08:02:21 -0400
4205 fix for handling transitions specified in Universal Time
4207 Some "public domain" notices have also been added.
4210 Release code96g - 1996-05-16 14:00:26 -0400
4212 fix for the simultaneous-DST-and-zone-change challenge
4215 Release data96h - 1996-05-09 17:40:51 -0400
4217 changes by Paul Eggert
4220 Release code96f-data96g - 1996-05-03 03:09:59 -0000
4221 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4223 The changes get us some of the way to fixing the problems noted in Paul
4224 Eggert's letter yesterday (in addition to a few others). The approach
4225 has been to make zic a bit smarter about figuring out what time zone
4226 abbreviations apply just after the time specified in the "UNTIL" part
4227 of a zone line. Putting the smarts in zic means avoiding having
4228 transition times show up in both "Zone" lines and "Rule" lines, which
4229 in turn avoids multiple transition time entries in time zone files.
4230 (This also makes the zic input files such as "europe" a bit shorter and
4231 should ease maintenance.)
4234 Release data96f - 1996-04-19 19:20:03 -0000
4235 [tzdata96f.tar.gz is missing!]
4237 The only changes are to the "northamerica" file; the time zone
4238 abbreviation for Denver is corrected to MST (and MDT), and the
4239 comments for Mexico have been updated.
4242 Release data96e - 1996-03-19 17:37:26 -0500
4244 Proposals by Paul Eggert, in particular the Portugal change that
4245 comes into play at the end of this month.
4248 Release data96d - 1996-03-18 20:49:39 -0500
4253 Release code96e - 1996-02-29 15:43:27 -0000
4254 [tzcode96e.tar.gz is missing!]
4256 internationalization changes and the fix to the documentation for strftime
4259 Release code96d-data96c - 1996-02-12 11:05:27 -0500
4261 The "code" file simply updates Bob Kridle's electronic address.
4263 The "data" file updates rules for Mexico.
4266 Release data96b - 1996-01-27 15:44:42 -0500
4271 Release code96c - 1996-01-16 16:58:15 -0500
4273 leap-year streamlining and binary-search changes
4278 Release code96b - 1996-01-10 20:42:39 -0500
4280 fixes and enhancements from Paul Eggert, including code that
4281 emulates the behavior of recent versions of the SunOS "date"
4285 Release 96a - 1996-01-06 09:08:24 -0500
4289 fixes to strftime.c for correct ISO 8601 week number generation,
4290 plus support for two new formats ('G' and 'g') to give ISO 8601 year
4291 numbers (which are not necessarily the same as calendar year numbers)
4294 Release code95i-data95m - 1995-12-21 12:46:47 -0500
4296 The latest revisions from Paul Eggert are included, the usno1995
4297 file has been updated, and a new file ("WWW") covering useful URLs
4301 Release code95h-data95l - 1995-12-19 18:10:12 -0500
4303 A simplification of a macro definition, a change to data for Sudan,
4304 and (for last minute shoppers) notes in the "Music" file on the CD
4308 Release code95g-data95k - 1995-10-30 10:32:47 -0500
4310 (slightly reformatted) 8-bit-clean proposed patch
4312 minor patch: US/Eastern -> America/New_York
4314 snapshot of the USNO's latest data ("usno1995")
4316 some other minor cleanups
4319 Release code95f-data95j - 1995-10-28 21:01:34 -0000
4320 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4324 support for 64-bit time_t's
4326 optimization in localtime.c
4329 Release code95e - 1995-10-13 13:23:57 -0400
4331 the mktime change to scan from future to past when trying to find time zone
4335 Release data95i - 1995-09-26 10:43:26 -0400
4337 For Canada/Central, guess that the Sun customer's "one week too
4338 early" was just a approximation, and the true error is one month
4339 too early. This is consistent with the rest of Canada.
4342 Release data95h - 1995-09-21 11:26:48 -0400
4344 latest changes from Paul Eggert
4347 Release code95d - 1995-09-14 11:14:45 -0400
4349 the addition of a "Music" file, which documents four recorded
4350 versions of the tune "Save That Time".
4353 Release data95g - 1995-09-01 17:21:36 -0400
4355 "yearistype" correction
4358 Release data95f - 1995-08-28 20:46:56 -0400
4360 Paul Eggert's change to the australasia file
4363 Release data95e - 1995-07-08 18:02:34 -0400
4365 The only change is a leap second at the end of this year.
4366 Thanks to Bradley White for forwarding news on the leap second.
4369 Release data95d - 1995-07-03 13:26:22 -0400
4371 Paul Eggert's changes
4374 Release data95c - 1995-07-02 19:19:28 -0400
4376 changes to "asia", "backward", "europe", and "southamerica"
4377 (read: northamericacentrics need not apply)
4380 Release code95c - 1995-03-13 14:00:46 -0500
4382 one-line fix for sign extension problems in detzcode
4385 Release 95b - 1995-03-04 11:22:38 -0500
4387 Minor changes in both:
4389 The "code" file contains a workaround for the lack of "unistd.h" in
4390 Microsoft C++ version 7.
4392 The "data" file contains a fixed "Link" for America/Shiprock.
4395 Release 94h - 1994-12-10 12:51:14 -0500
4399 * incorporate the changes to "zdump" and "date" to make changes to
4400 the "TZ" environment variable permanent;
4402 * incorporate the table changes by Paul Eggert;
4404 * include (and document) support for universal time specifications in
4405 data files - but do not (yet) include use of this feature in the
4408 Think of this as "TZ Classic" - the software has been set up not to break if
4409 universal time shows up in its input, and data entries have been
4410 left as is so as not to break existing implementations.
4413 Release data94f - 1994-08-20 12:56:09 -0400
4415 (with thanks!) the latest data updates from Paul Eggert
4418 Release data94e - 1994-06-04 13:13:53 -0400
4423 Release code94g - 1994-05-05 12:14:07 -0400
4425 fix missing "optind.c" and a reference to it in the Makefile
4428 Release code94f - 1994-05-05 13:00:33 -0000
4429 [tzcode94f.tar.gz is missing!]
4431 changes to avoid overflow in difftime, as well as changes to cope
4432 with the 52/53 challenge in strftime
4435 Release code94e - 1994-03-30 23:32:59 -0500
4437 change for the benefit of PCTS
4440 Release 94d - 1994-02-24 15:42:25 -0500
4442 Avoid clashes with POSIX semantics for zones such as GMT+4.
4444 Some other very minor housekeeping is also present.
4447 Release code94c - 1994-02-10 08:52:40 -0500
4449 Fix bug where mkdirs was broken unless you compile with
4450 -fwritable-strings (which is generally losing to do).
4453 Release 94b - 1994-02-07 10:04:33 -0500
4455 work by Paul Eggert who notes:
4457 I found another book of time zone histories by E W Whitman; it's not
4458 as extensive as Shanks but has a few goodies of its own. I used it
4459 to update the tables. I also fixed some more as a result of
4460 correspondence with Adam David and Peter Ilieve, and move some stray
4461 links from 'europe' to 'backward'. I corrected some scanning errors
4464 As far as the code goes, I fixed zic to allow years in the range
4465 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4466 And I cleaned up the zic documentation a little bit.
4469 Release data94a - 1994-02-03 08:58:54 -0500
4471 It simply incorporates the recently announced leap second into the
4475 Release 93g - 1993-11-22 17:28:27 -0500
4477 Paul Eggert has provided a good deal of historic information (based
4478 on Shanks), and there are some code changes to deal with the buglets
4479 that crawled out in dealing with the new information.
4482 Release 93f - 1993-10-15 12:27:46 -0400
4484 Paul Eggert's changes
4487 Release 93e - 1993-09-05 21:21:44 -0400
4489 This has updated data for Israel, England, and Kwajalein. There's
4490 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4491 Thanks to Paul Eggert and Peter Ilieve for the changes.
4494 Release 93d - 1993-06-17 23:34:17 -0400
4496 new fix and new data on Israel
4499 Release 93c - 1993-06-06 19:31:55 -0400
4504 Release 93b - 1993-02-02 14:53:58 -0500
4506 updated "leapseconds" file
4509 Release 93 - 1993-01-08 07:01:06 -0500
4511 At kre's suggestion, the package has been split in two - a code piece
4512 (which also includes documentation) that's only of use to folks who
4513 want to recompile things and a data piece useful to anyone who can
4516 The new version has a few changes to the data files, a few
4517 portability changes, and an off-by-one fix (with thanks to
4518 Tom Karzes at deshaw.com for providing a description and a
4522 Release 92c - 1992-11-21 17:35:36 -0000
4523 [tz92c.tar.Z is missing!]
4525 The fallout from the latest round of DST transitions.
4527 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4528 there's also a change to "zic.c" that makes it portable to more systems.
4531 Release 92 - 1992-04-25 18:17:03 -0000
4532 [tz92.tar.Z is missing!]
4534 By popular demand (well, at any rate, following a request by kre at munnari)
4537 The 1989 update of the time zone package featured:
4539 * POSIXization (including interpretation of POSIX-style TZ environment
4540 variables, provided by Guy Harris),
4541 * ANSIfication (including versions of "mktime" and "difftime"),
4542 * SVIDulation (an "altzone" variable)
4543 * MACHination (the "gtime" function)
4544 * corrections to some time zone data (including corrections to the rules
4545 for Great Britain and New Zealand)
4546 * reference data from the United States Naval Observatory for folks who
4547 want to do additional time zones
4548 * and the 1989 data for Saudi Arabia.
4550 (Since this code will be treated as "part of the implementation" in some
4551 places and as "part of the application" in others, there's no good way to
4552 name functions, such as timegm, that are not part of the proposed ANSI C
4553 standard; such functions have kept their old, underscore-free names in this
4556 And the "dysize" function has disappeared; it was present to allow
4557 compilation of the "date" command on old BSD systems, and a version of "date"
4558 is now provided in the package. The "date" command is not created when you
4559 "make all" since it may lack options provided by the version distributed with
4560 your operating system, or may not interact with the system in the same way
4561 the native version does.
4563 Since POSIX frowns on correct leap second handling, the default behavior of
4564 the "zic" command (in the absence of a "-L" option) has been changed to omit
4565 leap second information from its output files.
4571 This file contains copies of the part of each release announcement
4572 that talks about the changes in that release. The text has been
4573 adapted and reformatted for the purposes of this file.
4575 Traditionally a release R consists of a pair of tarball files,
4576 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4577 code2010a, data2012c) consist of just one or the other tarball, and a
4578 few (e.g., code2012c-data2012d) have tarballs with mixed version
4579 numbers. Recent releases also come in an experimental format
4580 consisting of a single tarball tzdb-R.tar.lz with extra data.
4582 Release timestamps are taken from the release's commit (for newer,
4583 Git-based releases), from the newest file in the tarball (for older
4584 releases, where this info is available) or from the email announcing
4585 the release (if all else fails; these are marked with a time zone
4586 abbreviation of -0000 and an "is missing!" comment).
4588 Earlier versions of the code and data were not announced on the tz
4589 list and are not summarized here.
4591 This file is in the public domain.