NEWS revision 1.46
1 News for the tz database 2 3 Release 2025a - 2025-01-15 10:47:24 -0800 4 5 Briefly: 6 Paraguay adopts permanent -03 starting spring 2024. 7 Improve pre-1991 data for the Philippines. 8 Etc/Unknown is now reserved. 9 10 Changes to future timestamps 11 12 Paraguay will stop changing its clocks after the spring-forward 13 transition on 2024-10-06, so it is now permanently at -03. 14 (Thanks to Heitor David Pinto and Even Scharning.) 15 This affects timestamps starting 2025-03-22, as well as the 16 obsolescent tm_isdst flags starting 2024-10-15. 17 18 Changes to past timestamps 19 20 Correct timestamps for the Philippines before 1900, and from 1937 21 through 1990. (Thanks to P Chan for the heads-up and citations.) 22 This includes adjusting local mean time before 1899; fixing 23 transitions in September 1899, January 1937, and June 1954; adding 24 transitions in December 1941, November 1945, March and September 25 1977, and May and July 1990; and removing incorrect transitions in 26 March and September 1978. 27 28 Changes to data 29 30 Add zone1970.tab lines for the Concordia and Eyre Bird Observatory 31 research stations. (Thanks to Derick Rethans and Jule Dabars.) 32 33 Changes to code 34 35 strftime %s now generates the correct numeric string even when the 36 represented number does not fit into time_t. This is better than 37 generating the numeric equivalent of (time_t) -1, as strftime did 38 in TZDB releases 96a (when %s was introduced) through 2020a and in 39 releases 2022b through 2024b. It is also better than failing and 40 returning 0, as strftime did in releases 2020b through 2022a. 41 42 strftime now outputs an invalid conversion specifier as-is, 43 instead of eliding the leading '%', which confused debugging. 44 45 An invalid TZ now generates the time zone abbreviation "-00", not 46 "UTC", to help the user see that an error has occurred. (Thanks 47 to Arthur David Olson for suggesting a "wrong result".) 48 49 mktime and timeoff no longer incorrectly fail merely because a 50 struct tm component near INT_MIN or INT_MAX overflows when a 51 lower-order component carries into it. 52 53 TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ 54 string's time zone abbreviation, now defaults to 254 not 255. 55 This helps reduce the size of internal state from 25480 to 21384 56 on common platforms. This change should not be a problem, as 57 nobody uses such long "abbreviations" and the longstanding tzcode 58 maximum was 16 until release 2023a. For those who prefer no 59 arbitrary limits, you can now specify TZNAME_MAXIMUM values up to 60 PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently 61 misbehaved unless TZNAME_MAXIMUM was less than INT_MAX. 62 63 tzset and related functions no longer leak a file descriptor if 64 another thread forks or execs at about the same time and if the 65 platform has O_CLOFORK and O_CLOEXEC respectively. Also, the 66 functions no longer let a TZif file become a controlling terminal. 67 68 'zdump -' now reads TZif data from /dev/stdin. 69 (From a question by Arthur David Olson.) 70 71 Changes to documentation 72 73 The name Etc/Unknown is now reserved: it will not be used by TZDB. 74 This is for compatibility with CLDR, which uses the string 75 "Etc/Unknown" for an unknown or invalid timezone. (Thanks to 76 Justin Grant, Mark Davis, and Guy Harris.) 77 78 Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format. 79 80 81 Release 2024b - 2024-09-04 12:27:47 -0700 82 83 Briefly: 84 Improve historical data for Mexico, Mongolia, and Portugal. 85 System V names are now obsolescent. 86 The main data form now uses %z. 87 The code now conforms to RFC 8536 for early timestamps. 88 Support POSIX.1-2024, which removes asctime_r and ctime_r. 89 Assume POSIX.2-1992 or later for shell scripts. 90 SUPPORT_C89 now defaults to 1. 91 92 Changes to past timestamps 93 94 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 95 being a separate Zone with differing behavior before April 2008. 96 This seems better given our wildly conflicting information about 97 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 98 99 Historical transitions for Mexico have been updated based on 100 official Mexican decrees. The affected timestamps occur during 101 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 102 The affected zones are America/Bahia_Banderas, America/Cancun, 103 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 104 America/Mazatlan, America/Merida, America/Mexico_City, 105 America/Monterrey, America/Ojinaga, and America/Tijuana. 106 (Thanks to Heitor David Pinto.) 107 108 Historical transitions for Portugal, represented by Europe/Lisbon, 109 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 110 close reading of old Portuguese legislation, replacing previous data 111 mainly originating from Whitman and Shanks & Pottenger. These 112 changes affect a few transitions in 1917-1921, 1924, and 1940 113 throughout these regions by a few hours or days, and various 114 timestamps between 1977 and 1993 depending on the region. In 115 particular, the Azores and Madeira did not observe DST from 1977 to 116 1981. Additionally, the adoption of standard zonal time in former 117 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 118 Asia/Dili by 22 minutes at the start of 1912. 119 (Thanks to Tim Parenti.) 120 121 Changes to past tm_isdst flags 122 123 The period from 1966-04-03 through 1966-10-02 in Portugal is now 124 modeled as DST, to more closely reflect how contemporaneous changes 125 in law entered into force. 126 127 Changes to data 128 129 Names present only for compatibility with UNIX System V 130 (last released in the 1990s) have been moved to 'backward'. 131 These names, which for post-1970 timestamps mostly just duplicate 132 data of geographical names, were confusing downstream uses. 133 Names moved to 'backward' are now links to geographical names. 134 This affects behavior for TZ='EET' for some pre-1981 timestamps, 135 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 136 some pre-1996 timestamps. Also, TZ='MET' now behaves like 137 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 138 Those needing the previous TZDB behavior, which does not match any 139 real-world clocks, can find the old entries in 'backzone'. 140 (Problem reported by Justin Grant.) 141 142 The main source files' time zone abbreviations now use %z, 143 supported by zic since release 2015f and used in vanguard form 144 since release 2022b. For example, America/Sao_Paulo now contains 145 the zone continuation line "-3:00 Brazil %z", which is less error 146 prone than the old "-3:00 Brazil -03/-02". This does not change 147 the represented data: the generated TZif files are unchanged. 148 Rearguard form still avoids %z, to support obsolescent parsers. 149 150 Asia/Almaty has been removed from zonenow.tab as it now agrees 151 with Asia/Tashkent for future timestamps, due to Kazakhstan's 152 2024-02-29 time zone change. Similarly, America/Scoresbysund 153 has been removed, as it now agrees with America/Nuuk due to 154 its 2024-03-31 time zone change. 155 156 Changes to code 157 158 localtime.c now always uses a TZif file's time type 0 to handle 159 timestamps before the file's first transition. Formerly, 160 localtime.c sometimes inferred a different time type, in order to 161 handle problematic data generated by zic 2018e or earlier. As it 162 is now safe to assume more recent versions of zic, there is no 163 longer a pressing need to fail to conform RFC 8536 section 3.2, 164 which requires using time type 0 in this situation. This change 165 does not affect behavior when reading TZif files generated by zic 166 2018f and later. 167 168 POSIX.1-2024 removes asctime_r and ctime_r and does not let 169 libraries define them, so remove them except when needed to 170 conform to earlier POSIX. These functions are dangerous as they 171 can overrun user buffers. If you still need them, add 172 -DSUPPORT_POSIX2008 to CFLAGS. 173 174 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 175 POSIX-conformance bug introduced in 2023a. 176 177 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 178 assumes POSIX.2-1992 or later, as practical porting targets now 179 all support that, and it uses some features from POSIX.1-2024 if 180 available. 181 182 Changes to build procedure 183 184 'make check' no longer requires curl and Internet access. 185 186 The build procedure now assumes POSIX.2-1992 or later, to simplify 187 maintenance. To build on Solaris 10, the only extant system still 188 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 189 190 Changes to documentation 191 192 The documentation now reflects POSIX.1-2024. 193 194 Changes to commentary 195 196 Commentary about historical transitions in Portugal and her former 197 colonies has been expanded with links to relevant legislation. 198 (Thanks to Tim Parenti.) 199 200 201 Release 2024a - 2024-02-01 09:28:56 -0800 202 203 Briefly: 204 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 205 Palestine springs forward a week later after Ramadan. 206 zic no longer pretends to support indefinite-past DST. 207 localtime no longer mishandles Ciudad Jurez in 2422. 208 209 Changes to future timestamps 210 211 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 212 Asia/Qostanay which together represent the eastern portion of the 213 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 214 join the western portion. (Thanks to Zhanbolat Raimbekov.) 215 216 Palestine springs forward a week later than previously predicted 217 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 218 predictions to the second Saturday after Ramadan, not the first; 219 this also affects other predictions starting in 2039. 220 221 Changes to past timestamps 222 223 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 224 not 00:00. (Thanks to on Trn Cng Danh.) 225 226 From 1947 through 1949, Toronto's transitions occurred at 02:00 227 not 00:00. (Thanks to Chris Walton.) 228 229 In 1911 Miquelon adopted standard time on June 15, not May 15. 230 231 Changes to code 232 233 The FROM and TO columns of Rule lines can no longer be "minimum" 234 or an abbreviation of "minimum", because TZif files do not support 235 DST rules that extend into the indefinite past - although these 236 rules were supported when TZif files had only 32-bit data, this 237 stopped working when 64-bit TZif files were introduced in 1995. 238 This should not be a problem for realistic data, since DST was 239 first used in the 20th century. As a transition aid, FROM columns 240 like "minimum" are now diagnosed and then treated as if they were 241 the year 1900; this should suffice for TZif files on old systems 242 with only 32-bit time_t, and it is more compatible with bugs in 243 2023c-and-earlier localtime.c. (Problem reported by Yoshito 244 Umaoka.) 245 246 localtime and related functions no longer mishandle some 247 timestamps that occur about 400 years after a switch to a time 248 zone with a DST schedule. In 2023d data this problem was visible 249 for some timestamps in November 2422, November 2822, etc. in 250 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 251 252 strftime %s now uses tm_gmtoff if available. (Problem and draft 253 patch reported by Dag-Erling Smrgrav.) 254 255 Changes to build procedure 256 257 The leap-seconds.list file is now copied from the IERS instead of 258 from its downstream counterpart at NIST, as the IERS version is 259 now in the public domain too and tends to be more up-to-date. 260 (Thanks to Martin Burnicki for liaisoning with the IERS.) 261 262 Changes to documentation 263 264 The strftime man page documents which struct tm members affect 265 which conversion specs, and that tzset is called. (Problems 266 reported by Robert Elz and Steve Summit.) 267 268 269 Release 2023d - 2023-12-21 20:02:24 -0800 270 271 Briefly: 272 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 273 Vostok, Antarctica changed time zones on 2023-12-18. 274 Casey, Antarctica changed time zones five times since 2020. 275 Code and data fixes for Palestine timestamps starting in 2072. 276 A new data file zonenow.tab for timestamps starting now. 277 278 Changes to future timestamps 279 280 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 281 the rest of Greenland's timekeeping practice on 2024-03-31, by 282 changing its time zone from -01/+00 to -02/-01 at the same moment 283 as the spring-forward transition. Its clocks will therefore not 284 spring forward as previously scheduled. The time zone change 285 reverts to its common practice before 1981. (Thanks to Jule Dabars.) 286 287 Fix predictions for DST transitions in Palestine in 2072-2075, 288 correcting a typo introduced in 2023a. (Thanks to Jule Dabars.) 289 290 Changes to past and future timestamps 291 292 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 293 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 294 295 Change data for Casey, Antarctica to agree with timeanddate.com, 296 by adding five time zone changes since 2020. Casey is now at +08 297 instead of +11. 298 299 Changes to past tm_isdst flags 300 301 Much of Greenland, represented by America/Nuuk, changed its 302 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 303 This does not affect UTC offsets, only the tm_isdst flag. 304 (Thanks to Thomas M. Steenholdt.) 305 306 New data file 307 308 A new data file zonenow.tab helps configure applications that use 309 timestamps dated from now on. This simplifies configuration, 310 since users choose from a smaller Zone set. The file's format is 311 experimental and subject to change. 312 313 Changes to code 314 315 localtime.c no longer mishandles TZif files that contain a single 316 transition into a DST regime. Previously, it incorrectly assumed 317 DST was in effect before the transition too. (Thanks to Alois 318 Treindl for debugging help.) 319 320 localtime.c's timeoff no longer collides with OpenBSD 7.4. 321 322 The C code now uses _Generic only if __STDC_VERSION__ says the 323 compiler is C11 or later. 324 325 tzselect now optionally reads zonenow.tab, to simplify when 326 configuring only for timestamps dated from now on. 327 328 tzselect no longer creates temporary files. 329 330 tzselect no longer mishandles the following: 331 332 Spaces and most other special characters in BUGEMAIL, PACKAGE, 333 TZDIR, and VERSION. 334 335 TZ strings when using mawk 1.4.3, which mishandles regular 336 expressions of the form /X{2,}/. 337 338 ISO 6709 coordinates when using an awk that lacks the GNU 339 extension of newlines in -v option-arguments. 340 341 Non UTF-8 locales when using an iconv command that lacks the GNU 342 //TRANSLIT extension. 343 344 zic no longer mishandles data for Palestine after the year 2075. 345 Previously, it incorrectly omitted post-2075 transitions that are 346 predicted for just before and just after Ramadan. (Thanks to Ken 347 Murchison for debugging help.) 348 349 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 350 (Problem reported by Rune Torgersen.) 351 352 Changes to build procedure 353 354 The Makefile is now more compatible with POSIX: 355 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 356 * It no longer uses its own 'cc' in place of CC. 357 * It now uses ARFLAGS, with default specified by POSIX. 358 * It does not use LFLAGS incompatibly with POSIX. 359 * It uses the special .POSIX target. 360 * It quotes special characters more carefully. 361 * It no longer mishandles builds in an ISO 8859 locale. 362 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 363 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 364 now treated like TZDIR as they have similar roles. 365 366 Changes to commentary 367 368 Limitations and hazards of the optional support for obsolescent 369 C89 platforms are documented better, along with a tentative 370 schedule for removing this support. 371 372 373 Release 2023c - 2023-03-28 12:42:14 -0700 374 375 Changes to past and future timestamps 376 377 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 378 (Thanks to Rany Hany for the heads-up.) 379 380 381 Release 2023b - 2023-03-23 19:50:38 -0700 382 383 Changes to future timestamps 384 385 This year Lebanon springs forward April 20/21 not March 25/26. 386 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 387 388 389 Release 2023a - 2023-03-22 12:39:33 -0700 390 391 Briefly: 392 Egypt now uses DST again, from April through October. 393 This year Morocco springs forward April 23, not April 30. 394 Palestine delays the start of DST this year. 395 Much of Greenland still uses DST from 2024 on. 396 America/Yellowknife now links to America/Edmonton. 397 tzselect can now use current time to help infer timezone. 398 The code now defaults to C99 or later. 399 Fix use of C23 attributes. 400 401 Changes to future timestamps 402 403 Starting in 2023, Egypt will observe DST from April's last Friday 404 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 405 Assume the transition times are 00:00 and 24:00, respectively. 406 407 In 2023 Morocco's spring-forward transition after Ramadan 408 will occur April 23, not April 30. (Thanks to Milamber.) 409 Adjust predictions for future years accordingly. This affects 410 predictions for 2023, 2031, 2038, and later years. 411 412 This year Palestine will delay its spring forward from 413 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 414 Make guesses for future Ramadans too. 415 416 Much of Greenland, represented by America/Nuuk, will continue to 417 observe DST using European Union rules. When combined with 418 Greenland's decision not to change the clocks in fall 2023, 419 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 420 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 421 This change from 2022g doesn't affect timestamps until 2024-03-30, 422 and doesn't affect tm_isdst until 2023-03-25. 423 424 Changes to past timestamps 425 426 America/Yellowknife has changed from a Zone to a backward 427 compatibility Link, as it no longer differs from America/Edmonton 428 since 1970. (Thanks to Almaz Mingaleev.) This affects some 429 pre-1948 timestamps. The old data are now in 'backzone'. 430 431 Changes to past time zone abbreviations 432 433 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 434 use the abbreviations MSK/MSD instead of numeric abbreviations, 435 for consistency with other timezones observing Moscow time. 436 437 Changes to code 438 439 You can now tell tzselect local time, to simplify later choices. 440 Select the 'time' option in its first prompt. 441 442 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 443 abbreviations to N bytes (default 255). The reference runtime 444 library now rejects POSIX-style TZ strings that contain longer 445 abbreviations, treating them as UTC. Previously the limit was 446 platform dependent and abbreviations were silently truncated to 447 16 bytes even when the limit was greater than 16. 448 449 The code by default is now designed for C99 or later. To build on 450 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 451 work on C89 platforms that also support C99 'long long' and 452 perhaps a few other extensions to C89. To support C89 callers of 453 tzcode's library, compile with -DSUPPORT_C89; however, this could 454 trigger latent bugs in C99-or-later callers. The two new macros 455 are transitional aids planned to be removed in a future version 456 (say, in 2029), when C99 or later will be required. 457 458 The code now builds again on pre-C99 platforms, if you compile 459 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 460 461 On C23-compatible platforms tzcode no longer uses syntax like 462 'static [[noreturn]] void usage(void);'. Instead, it uses 463 '[[noreturn]] static void usage(void);' as strict C23 requires. 464 (Problem reported by Houge Langley.) 465 466 The code's functions now constrain their arguments with the C 467 'restrict' keyword consistently with their documentation. 468 This may allow future optimizations. 469 470 zdump again builds standalone with ckdadd and without setenv, 471 fixing a bug introduced in 2022g. (Problem reported by panic.) 472 473 leapseconds.awk can now process a leap seconds file that never 474 expires; this might be useful if leap seconds are discontinued. 475 476 Changes to commentary 477 478 tz-link.html has a new section "Coordinating with governments and 479 distributors". (Thanks to Neil Fuller for some of the text.) 480 481 To improve tzselect diagnostics, zone1970.tab's comments column is 482 now limited to countries that have multiple timezones. 483 484 Note that there are plans to discontinue leap seconds by 2035. 485 486 487 Release 2022g - 2022-11-29 08:58:31 -0800 488 489 Briefly: 490 The northern edge of Chihuahua changes to US timekeeping. 491 Much of Greenland stops changing clocks after March 2023. 492 Fix some pre-1996 timestamps in northern Canada. 493 C89 is now deprecated; please use C99 or later. 494 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 495 In C code, use more C23 features if available. 496 C23 timegm now supported by default 497 Fixes for unlikely integer overflows 498 499 Changes to future timestamps 500 501 In the Mexican state of Chihuahua, the border strip near the US 502 will change to agree with nearby US locations on 2022-11-30. 503 The strip's western part, represented by Ciudad Jurez, switches 504 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 505 The eastern part, represented by Ojinaga, will observe US DST next 506 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 507 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 508 509 Much of Greenland, represented by America/Nuuk, stops observing 510 winter time after March 2023, so its daylight saving time becomes 511 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 512 513 Changes to past timestamps 514 515 Changes for pre-1996 northern Canada (thanks to Chris Walton): 516 517 Merge America/Iqaluit and America/Pangnirtung into the former, 518 with a backward compatibility link for the latter name. 519 There is no good evidence the two locations differ since 1970. 520 This change affects pre-1996 America/Pangnirtung timestamps. 521 522 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 523 Yellowknife did not observe DST in 1965, and did observe DST 524 from 1972 through 1979. 525 526 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 527 528 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 529 (Thanks to Alois Treindl.) 530 531 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 532 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 533 534 Changes to code 535 536 Although tzcode still works with C89, bugs found in recent routine 537 maintenance indicate that bitrot has set in and that in practice 538 C89 is no longer used to build tzcode. As it is a maintenance 539 burden, support for C89 is planned to be removed soon. Instead, 540 please use compilers compatible with C99, C11, C17, or C23. 541 542 timegm, which tzcode implemented in 1989, will finally be 543 standardized 34 years later as part of C23, so timegm is now 544 supported even if STD_INSPIRED is not defined. 545 546 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 547 (Problem reported by on Trn Cng Danh.) 548 549 Fix bug in zic on hosts where malloc(0) yields NULL on success. 550 (Problem reported by Tim McBrayer for AIX 6.1.) 551 552 Fix zic configuration to avoid linkage failures on some platforms. 553 (Problems reported by Gilmore Davidson and Igor Ivanov.) 554 555 Work around MS-Windows nmake incompatibility with POSIX. 556 (Problem reported by Manuela Friedrich.) 557 558 Port mktime and strftime to debugging platforms where accessing 559 uninitialized data has undefined behavior (strftime problem 560 reported by Robert Elz). 561 562 Check more carefully for unlikely integer overflows, preferring 563 C23 <stdckdint.h> to overflow checking by hand, as the latter has 564 had obscure bugs. 565 566 Changes to build procedure 567 568 New Makefile rule check_mild that skips checking whether Link 569 lines are in the file 'backward'. (Inspired by a suggestion from 570 Stephen Colebourne.) 571 572 On C23-compatible platforms tzcode no longer uses syntax like 573 'static [[noreturn]] void usage(void);'. Instead, it uses 574 '[[noreturn]] static void usage(void);' as strict C23 requires. 575 (Problem reported by Houge Langley.) 576 577 578 Release 2022f - 2022-10-28 18:04:57 -0700 579 580 Briefly: 581 Mexico will no longer observe DST except near the US border. 582 Chihuahua moves to year-round -06 on 2022-10-30. 583 Fiji no longer observes DST. 584 Move links to 'backward'. 585 In vanguard form, GMT is now a Zone and Etc/GMT a link. 586 zic now supports links to links, and vanguard form uses this. 587 Simplify four Ontario zones. 588 Fix a Y2438 bug when reading TZif data. 589 Enable 64-bit time_t on 32-bit glibc platforms. 590 Omit large-file support when no longer needed. 591 In C code, use some C23 features if available. 592 Remove no-longer-needed workaround for Qt bug 53071. 593 594 Changes to future timestamps 595 596 Mexico will no longer observe DST after 2022, except for areas 597 near the US border that continue to observe US DST rules. 598 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 599 from -07 (-06 with DST) to year-round -06, thus not changing 600 its clocks that day. The new law states that Chihuahua 601 near the US border no longer observes US DST. 602 (Thanks to gera for the heads-up about Chihuahua.) 603 604 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 605 For now, assume DST is suspended indefinitely. 606 607 Changes to data 608 609 Move links to 'backward' to ease and simplify link maintenance. 610 This affects generated data only if you use 'make BACKWARD='. 611 612 GMT is now a Zone and Etc/GMT a link instead of vice versa, 613 as GMT is needed for leap second support whereas Etc/GMT is not. 614 However, this change exposes a bug in TZUpdater 2.3.2 so it is 615 present only in vanguard form for now. 616 617 Vanguard form now uses links to links, as zic now supports this. 618 619 Changes to past timestamps 620 621 Simplify four Ontario zones, as most of the post-1970 differences 622 seem to have been imaginary. (Problem reported by Chris Walton.) 623 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 624 to 'backzone'; backward-compatibility links still work, albeit 625 with some different timestamps before November 2005. 626 627 Changes to code 628 629 zic now supports links to links regardless of input line order. 630 For example, if Australia/Sydney is a Zone, the lines 631 Link Australia/Canberra Australia/ACT 632 Link Australia/Sydney Australia/Canberra 633 now work correctly, even though the shell commands 634 ln Australia/Canberra Australia/ACT 635 ln Australia/Sydney Australia/Canberra 636 would fail because the first command attempts to use a link 637 Australia/Canberra that does not exist until after the second 638 command is executed. Previously, zic had unspecified behavior if 639 a Link line's target was another link, and zic often misbehaved if 640 a Link line's target was a later Link line. 641 642 Fix line number in zic's diagnostic for a link to a link. 643 644 Fix a bug that caused localtime to mishandle timestamps starting 645 in the year 2438 when reading data generated by 'zic -b fat' when 646 distant-future DST transitions occur at times given in standard 647 time or in UT, not the usual case of local time. This occurs when 648 the corresponding .zi Rule lines specify DST transitions with TO 649 columns of 'max' and AT columns that end in 's' or 'u'. The 650 number 2438 comes from the 32-bit limit in the year 2038, plus the 651 400-year Gregorian cycle. (Problem reported by Bradley White.) 652 653 On glibc 2.34 and later, which optionally supports 64-bit time_t 654 on platforms like x86 where time_t was traditionally 32 bits, 655 default time_t to 64 instead of 32 bits. This lets functions like 656 localtime support timestamps after the year 2038, and fixes 657 year-2038 problems in zic when accessing files dated after 2038. 658 To continue to limit time_t to 32 bits on these platforms, use 659 "make CFLAGS='-D_TIME_BITS=32'". 660 661 In C code, do not enable large-file support on platforms like AIX 662 and macOS that no longer need it now that tzcode does not use 663 off_t or related functions like 'stat'. Large-file support is 664 still enabled by default on GNU/Linux, as it is needed for 64-bit 665 time_t support. 666 667 In C code, prefer C23 keywords to pre-C23 macros for alignof, 668 bool, false, and true. Also, use the following C23 features if 669 available: __has_include, unreachable. 670 671 zic no longer works around Qt bug 53071, as the relevant Qt 672 releases have been out of support since 2019. This change affects 673 only fat TZif files, as thin files never had the workaround. 674 675 zdump no longer modifies the environ vector when compiled on 676 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 677 This avoid undefined behavior on POSIX platforms. 678 679 680 Release 2022e - 2022-10-11 11:13:02 -0700 681 682 Briefly: 683 Jordan and Syria switch from +02/+03 with DST to year-round +03. 684 685 Changes to future timestamps 686 687 Jordan and Syria are abandoning the DST regime and are changing to 688 permanent +03, so they will not fall back from +03 to +02 on 689 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 690 691 Changes to past timestamps 692 693 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 694 695 Changes to past time zone abbreviations and DST flags 696 697 The temporary advancement of clocks in central Mexico in summer 698 1931 is now treated as daylight saving time, instead of as two 699 changes to standard time. 700 701 702 Release 2022d - 2022-09-23 12:02:57 -0700 703 704 Briefly: 705 Palestine transitions are now Saturdays at 02:00. 706 Simplify three Ukraine zones into one. 707 708 Changes to future timestamps 709 710 Palestine now springs forward and falls back at 02:00 on the 711 first Saturday on or after March 24 and October 24, respectively. 712 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 713 (Thanks to Heba Hamad.) 714 715 Changes to past timestamps 716 717 Simplify three Ukraine zones to one, since the post-1970 718 differences seem to have been imaginary. Move Europe/Uzhgorod and 719 Europe/Zaporozhye to 'backzone'; backward-compatibility links 720 still work, albeit with different timestamps before October 1991. 721 722 723 Release 2022c - 2022-08-15 17:47:18 -0700 724 725 Briefly: 726 Work around awk bug in FreeBSD, macOS, etc. 727 Improve tzselect on intercontinental Zones. 728 729 Changes to code 730 731 Work around a bug in onetrueawk that broke commands like 732 'make traditional_tarballs' on FreeBSD, macOS, etc. 733 (Problem reported by Deborah Goldsmith.) 734 735 Add code to tzselect that uses experimental structured comments in 736 zone1970.tab to clarify whether Zones like Africa/Abidjan and 737 Europe/Istanbul cross continent or ocean boundaries. 738 (Inspired by a problem reported by Peter Krefting.) 739 740 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 741 directory /a/b already exists. 742 743 Remove zoneinfo2tdf.pl, as it was unused and triggered false 744 malware alarms on some email servers. 745 746 747 Release 2022b - 2022-08-10 15:38:32 -0700 748 749 Briefly: 750 Chile's DST is delayed by a week in September 2022. 751 Iran no longer observes DST after 2022. 752 Rename Europe/Kiev to Europe/Kyiv. 753 New zic -R option 754 Vanguard form now uses %z. 755 Finish moving duplicate-since-1970 zones to 'backzone'. 756 New build option PACKRATLIST 757 New tailored_tarballs target, replacing rearguard_tarballs 758 759 Changes to future timestamps 760 761 Chile's 2022 DST start is delayed from September 4 to September 11. 762 (Thanks to Juan Correa.) 763 764 Iran plans to stop observing DST permanently, after it falls back 765 on 2022-09-21. (Thanks to Ali Mirjamali.) 766 767 Changes to past timestamps 768 769 Finish moving to 'backzone' the location-based zones whose 770 timestamps since 1970 are duplicates; adjust links accordingly. 771 This change ordinarily affects only pre-1970 timestamps, and with 772 the new PACKRATLIST option it does not affect any timestamps. 773 In this round the affected zones are Antarctica/Vostok, 774 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 775 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 776 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 777 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 778 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 779 Pacific/Wake and Pacific/Wallis, and the affected links are 780 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 781 Pacific/Truk, and Pacific/Yap. 782 783 From fall 1994 through fall 1995, Shanks wrote that Crimea's 784 DST transitions were at 02:00 standard time, not at 00:00. 785 (Thanks to Michael Deckers.) 786 787 Iran adopted standard time in 1935, not 1946. In 1977 it observed 788 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 789 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 790 transition was on 05-27, not 03-21. 791 (Thanks to Roozbeh Pournader and Francis Santoni.) 792 793 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 794 considered DST, not standard time. Santiago and environs had moved 795 their clocks back to rejoin the rest of mainland Chile; put this 796 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 797 798 Some old, small clock transitions have been removed, as people at 799 the time did not change their clocks. This affects Asia/Hong_Kong 800 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 801 802 Changes to zone name 803 804 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 805 English now. Spelling of other names in Ukraine has not yet 806 demonstrably changed in common English practice so for now these 807 names retain old spellings, as in other countries (e.g., 808 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 809 810 Changes to code 811 812 zic has a new option '-R @N' to output explicit transitions < N. 813 (Need suggested by Almaz Mingaleev.) 814 815 'zic -r @N' no longer outputs bad data when N < first transition. 816 (Problem introduced in 2021d and reported by Peter Krefting.) 817 818 zic now checks its input for NUL bytes and unterminated lines, and 819 now supports input line lengths up to 2048 (not 512) bytes. 820 821 gmtime and related code now use the abbreviation "UTC" not "GMT". 822 POSIX is being revised to require this. 823 824 When tzset and related functions set vestigial static variables 825 like tzname, they now prefer specified timestamps to unspecified ones. 826 (Problem reported by Almaz Mingaleev.) 827 828 zic no longer complains "can't determine time zone abbreviation to 829 use just after until time" when a transition to a new standard 830 time occurs simultaneously with the first DST fallback transition. 831 832 Changes to build procedure 833 834 Source data in vanguard form now uses the %z notation, introduced 835 in release 2015f. For example, for America/Sao_Paulo vanguard 836 form contains the zone continuation line "-3:00 Brazil %z", which 837 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 838 used in main and rearguard forms. The plan is for the main form 839 to use %z eventually; in the meantime maintainers of zi parsers 840 are encouraged to test the parsers on vanguard.zi. 841 842 The Makefile has a new PACKRATLIST option to select a subset of 843 'backzone'. For example, 'make PACKRATDATA=backzone 844 PACKRATLIST=zone.tab' now generates TZif files identical to those 845 of the global-tz project. 846 847 The Makefile has a new tailored_tarballs target for generating 848 special-purpose tarballs. It generalizes and replaces the 849 rearguard_tarballs target and related targets and macros, which 850 are now obsolescent. 851 852 'make install' now defaults LOCALTIME to Factory not GMT, 853 which means the default abbreviation is now "-00" not "GMT". 854 855 Remove the posix_packrat target, marked obsolescent in 2016a. 856 857 858 Release 2022a - 2022-03-15 23:02:01 -0700 859 860 Briefly: 861 Palestine will spring forward on 2022-03-27, not -03-26. 862 zdump -v now outputs better failure indications. 863 Bug fixes for code that reads corrupted TZif data. 864 865 Changes to future timestamps 866 867 Palestine will spring forward on 2022-03-27, not 2022-03-26. 868 (Thanks to Heba Hamad.) Predict future transitions for first 869 Sunday >= March 25. Additionally, predict fallbacks to be the first 870 Friday on or after October 23, not October's last Friday, to be more 871 consistent with recent practice. The first differing fallback 872 prediction is on 2025-10-24, not 2025-10-31. 873 874 Changes to past timestamps 875 876 From 1992 through spring 1996, Ukraine's DST transitions were at 877 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 878 879 Chile's Santiago Mean Time and its LMT precursor have been adjusted 880 eastward by 1 second to align with past and present law. 881 882 Changes to commentary 883 884 Add several references for Chile's 1946/1947 transitions, some of 885 which only affected portions of the country. 886 887 Changes to code 888 889 Fix bug when mktime gets confused by truncated TZif files with 890 unspecified local time. (Problem reported by Almaz Mingaleev.) 891 892 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 893 (Problem reported by Christos Zoulas.) 894 895 When reading a version 2 or later TZif file, the TZif reader now 896 validates the version 1 header and data block only enough to skip 897 over them, as recommended by RFC 8536 section 4. Also, the TZif 898 reader no longer mistakenly attempts to parse a version 1 TZIf 899 file header as a TZ string. 900 901 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 902 when local time and UT cannot be determined for a timestamp. 903 904 Changes to build procedure 905 906 Distribution tarballs now use standard POSIX.1-1988 ustar format 907 instead of GNU format. Although the formats are almost identical 908 for these tarballs, ustar headers' magic fields contain "ustar" 909 instead of "ustar ", and their version fields contain "00" instead 910 of " ". The two formats are planned to diverge more significantly 911 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 912 format becomes obsolete and the tarballs switch to pax format, an 913 extension of ustar. For details about these formats, please see 914 "pax - portable archive interchange", IEEE Std 1003.1-2017, 915 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 916 917 918 Release 2021e - 2021-10-21 18:41:00 -0700 919 920 Changes to future timestamps 921 922 Palestine will fall back 10-29 (not 10-30) at 01:00. 923 (Thanks to P Chan and Heba Hemad.) 924 925 926 Release 2021d - 2021-10-15 13:48:18 -0700 927 928 Briefly: 929 Fiji suspends DST for the 2021/2022 season. 930 'zic -r' marks unspecified timestamps with "-00". 931 932 Changes to future timestamps 933 934 Fiji will suspend observance of DST for the 2021/2022 season. 935 Assume for now that it will return next year. (Thanks to Jashneel 936 Kumar and P Chan.) 937 938 Changes to code 939 940 'zic -r' now uses "-00" time zone abbreviations for intervals 941 with UT offsets that are unspecified due to -r truncation. 942 This implements a change in draft Internet RFC 8536bis. 943 944 945 Release 2021c - 2021-10-01 14:21:49 -0700 946 947 Briefly: 948 Revert most 2021b changes to 'backward'. 949 Fix 'zic -b fat' bug in pre-1970 32-bit data. 950 Fix two Link line typos. 951 Distribute SECURITY file. 952 953 This release is intended as a bugfix release, to fix compatibility 954 problems and typos reported since 2021b was released. 955 956 Changes to Link directives 957 958 Revert almost all of 2021b's changes to the 'backward' file, 959 by moving Link directives back to where they were in 2021a. 960 Although 'zic' doesn't care which source file contains a Link 961 directive, some downstream uses ran into trouble with the move. 962 (Problem reported by Stephen Colebourne for Joda-Time.) 963 964 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 965 (problem reported by Chris Walton). 966 967 Fix 'backzone' typo that linked America/Virgin to the wrong 968 location (problem reported by Michael Deckers). 969 970 Changes to code 971 972 Fix a bug in 'zic -b fat' that caused old timestamps to be 973 mishandled in 32-bit-only readers (problem reported by Daniel 974 Fischer). 975 976 Changes to documentation 977 978 Distribute the SECURITY file (problem reported by Andreas Radke). 979 980 981 Release 2021b - 2021-09-24 16:23:00 -0700 982 983 Briefly: 984 Jordan now starts DST on February's last Thursday. 985 Samoa no longer observes DST. 986 Merge more location-based Zones whose timestamps agree since 1970. 987 Move some backward-compatibility links to 'backward'. 988 Rename Pacific/Enderbury to Pacific/Kanton. 989 Correct many pre-1993 transitions in Malawi, Portugal, etc. 990 zic now creates each output file or link atomically. 991 zic -L no longer omits the POSIX TZ string in its output. 992 zic fixes for truncation and leap second table expiration. 993 zic now follows POSIX for TZ strings using all-year DST. 994 Fix some localtime crashes and bugs in obscure cases. 995 zdump -v now outputs more-useful boundary cases. 996 tzfile.5 better matches a draft successor to RFC 8536. 997 A new file SECURITY. 998 999 This release is prompted by recent announcements by Jordan and Samoa. 1000 It incorporates many other changes that had accumulated since 2021a. 1001 However, it omits most proposed changes that merged all Zones 1002 agreeing since 1970, as concerns were raised about doing too many of 1003 these changes at once. It does keeps some of these changes in the 1004 interest of making tzdb more equitable one step at a time; see 1005 "Merge more location-based Zones" below. 1006 1007 Changes to future timestamps 1008 1009 Jordan now starts DST on February's last Thursday. 1010 (Thanks to Steffen Thorsen.) 1011 1012 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1013 1014 Changes to zone name 1015 1016 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1017 Enderbury in 1993, we did not know that it is uninhabited and that 1018 Kanton (population two dozen) is the only inhabited location in 1019 that timezone. The old name is now a backward-compatibility link. 1020 1021 Changes to past timestamps 1022 1023 Correct many pre-1993 transitions, fixing entries originally 1024 derived from Shanks, Whitman, and Mundell. The fixes include: 1025 - Barbados: standard time was introduced in 1911, not 1932; and 1026 DST was observed in 1942-1944 1027 - Cook Islands: In 1899 they switched from east to west of GMT, 1028 celebrating Christmas for two days. They (and Niue) switched 1029 to standard time in 1952, not 1901. 1030 - Guyana: corrected LMT for Georgetown; the introduction of 1031 standard time in 1911, not 1915; and corrections to 1975 and 1032 1992 transitions 1033 - Kanton: uninhabited before 1937-08-31 1034 - Niue: only observed -11:20 from 1952 through 1964, then went to 1035 -11 instead of -11:30 1036 - Portugal: DST was observed in 1950 1037 - Tonga: corrected LMT; the introduction of standard time in 1945, 1038 not 1901; and corrections to the transition from +12:20 to +13 1039 in 1961, not 1941 1040 Additional fixes to entries in the 'backzone' file include: 1041 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1042 - The Gambia: 1933 and 1942 transitions 1043 - Malawi: several 1911 through 1925 transitions 1044 - Sierra Leone: several 1913 through 1941 transitions, and DST 1045 was NOT observed in 1957 through 1962 1046 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1047 Alois Treindl.) 1048 1049 Merge more location-based Zones whose timestamps agree since 1970, 1050 as pre-1970 timestamps are out of scope. This is part of a 1051 process that has been ongoing since 2013. This does not affect 1052 post-1970 timestamps, and timezone historians who build with 'make 1053 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1054 When merging, keep the most-populous location's data, and move 1055 data for other locations to 'backzone' with a backward 1056 link in 'backward'. For example, move America/Creston data to 1057 'backzone' with a link in 'backward' from America/Phoenix because 1058 the two timezones' timestamps agree since 1970; this change 1059 affects some pre-1968 timestamps in America/Creston because 1060 Creston and Phoenix disagreed before 1968. The affected Zones 1061 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1062 America/Creston, America/Curacao, America/Nassau, 1063 America/Port_of_Spain, Antarctica/DumontDUrville, and 1064 Antarctica/Syowa. 1065 1066 Changes to maintenance procedure 1067 1068 The new file SECURITY covers how to report security-related bugs. 1069 1070 Several backward-compatibility links have been moved to the 1071 'backward' file. These links, which range from Africa/Addis_Ababa 1072 to Pacific/Saipan, are only for compatibility with now-obsolete 1073 guidelines suggesting an entry for every ISO 3166 code. 1074 The intercontinental convenience links Asia/Istanbul and 1075 Europe/Nicosia have also been moved to 'backward'. 1076 1077 Changes to code 1078 1079 zic now creates each output file or link atomically, 1080 possibly by creating a temporary file and then renaming it. 1081 This avoids races where a TZ setting would temporarily stop 1082 working while zic was installing a replacement file or link. 1083 1084 zic -L no longer omits the POSIX TZ string in its output. 1085 Starting with 2020a, zic -L truncated its output according to the 1086 "Expires" directive or "#expires" comment in the leapseconds file. 1087 The resulting TZif files omitted daylight saving transitions after 1088 the leap second table expired, which led to far less accurate 1089 predictions of times after the expiry. Although future timestamps 1090 cannot be converted accurately in the presence of leap seconds, it 1091 is more accurate to convert near-future timestamps with a few 1092 seconds error than with an hour error, so zic -L no longer 1093 truncates output in this way. 1094 1095 Instead, when zic -L is given the "Expires" directive, it now 1096 outputs the expiration by appending a no-change entry to the leap 1097 second table. Although this should work well with most TZif 1098 readers, it does not conform to Internet RFC 8536 and some pickier 1099 clients (including tzdb 2017c through 2021a) reject it, so 1100 "Expires" directives are currently disabled by default. To enable 1101 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1102 this new feature it is marked with a new TZif version number 4, 1103 a format intended to be documented in a successor to RFC 8536. 1104 The old-format "#expires" comments are now treated solely as 1105 comments and have no effect on the TZif files. 1106 1107 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1108 that omits leap second information for the range LO..B when LO 1109 falls between two leap seconds A and B. Instead, it generates a 1110 TZif version 4 file that represents the previously missing 1111 information. 1112 1113 The TZif reader now allows the leap second table to begin with a 1114 correction other than -1 or +1, and to contain adjacent 1115 transitions with equal corrections. This supports TZif version 4. 1116 1117 The TZif reader now lets leap seconds occur less than 28 days 1118 apart. This supports possible future TZif extensions. 1119 1120 Fix bug that caused 'localtime' etc. to crash when TZ was 1121 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1122 not conform to POSIX but does conform to Internet RFC 8536. 1123 1124 Fix another bug that caused 'localtime' etc. to crash when TZ was 1125 set to a POSIX-conforming but unusual TZ string like 1126 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1127 1128 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1129 TZif files containing leap seconds after the last explicit 1130 transition in the table, or when handling far-future timestamps 1131 in slim TZif files lacking leap seconds. 1132 1133 Fix localtime misbehavior involving positive leap seconds. 1134 This change affects only behavior for "right" system time, 1135 which contains leap seconds, and only if the UT offset is 1136 not a multiple of 60 seconds when a positive leap second occurs. 1137 (No such timezone exists in tzdb, luckily.) Without the fix, 1138 the timestamp was ambiguous during a positive leap second. 1139 With the fix, any seconds occurring after a positive leap second 1140 and within the same localtime minute are counted through 60, not 1141 through 59; their UT offset (tm_gmtoff) is the same as before. 1142 Here is how the fix affects timestamps in a timezone with UT 1143 offset +01:23:45 (5025 seconds) and with a positive leap second at 1144 1972-06-30 23:59:60 UTC (78796800): 1145 1146 time_t without the fix with the fix 1147 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1148 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1149 ... 1150 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1151 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1152 1153 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1154 civil time changes a few seconds before time_t wraps around, when 1155 leap seconds are enabled. 1156 1157 Fix bug in zic -r; in some cases, the dummy time type after the 1158 last time transition disagreed with the TZ string, contrary to 1159 Internet RFC 8563 section 3.3. 1160 1161 Fix a bug with 'zic -r @X' when X is a negative leap second that 1162 has a nonnegative correction. Without the fix, the output file 1163 was truncated so that X appeared to be a positive leap second. 1164 Fix a similar, even less likely bug when truncating at a positive 1165 leap second that has a nonpositive correction. 1166 1167 zic -r now reports an error if given rolling leap seconds, as this 1168 usage has never generally worked and is evidently unused. 1169 1170 zic now generates a POSIX-conforming TZ string for TZif files 1171 where all-year DST is predicted for the indefinite future. 1172 For example, for all-year Eastern Daylight Time, zic now generates 1173 "XXX3EDT4,0/0,J365/23" where it previously generated 1174 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1175 noting the possibility of POSIX conformance.) 1176 1177 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1178 noting it wasn't needed). 1179 1180 When reading slim TZif files, zdump no longer mishandles leap 1181 seconds on the rare platforms where time_t counts leap seconds, 1182 fixing a bug introduced in 2014g. 1183 1184 zdump -v now outputs timestamps at boundaries of what localtime 1185 and gmtime can represent, instead of the less useful timestamps 1186 one day after the minimum and one day before the maximum. 1187 (Thanks to Arthur David Olson for prototype code, and to Manuela 1188 Friedrich for debugging help.) 1189 1190 zdump's -c and -t options are now consistently inclusive for the 1191 lower time bound and exclusive for the upper. Formerly they were 1192 inconsistent. (Confusion noted by Martin Burnicki.) 1193 1194 Changes to build procedure 1195 1196 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1197 non-POSIX hosts where malloc doesn't set errno. 1198 (Problem reported by Jan Engelhardt.) 1199 1200 Changes to documentation 1201 1202 tzfile.5 better matches a draft successor to RFC 8536 1203 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1204 1205 1206 Release 2021a - 2021-01-24 10:54:57 -0800 1207 1208 Changes to future timestamps 1209 1210 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1211 (Thanks to Steffen Thorsen.) 1212 1213 1214 Release 2020f - 2020-12-29 00:17:46 -0800 1215 1216 Change to build procedure 1217 1218 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1219 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1220 1221 1222 Release 2020e - 2020-12-22 15:14:34 -0800 1223 1224 Briefly: 1225 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1226 1227 Changes to future timestamps 1228 1229 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1230 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1231 1232 Changes to past timestamps 1233 1234 Correct many pre-1986 transitions, fixing entries originally 1235 derived from Shanks. The fixes include: 1236 - Australia: several 1917 through 1971 transitions 1237 - The Bahamas: several 1941 through 1945 transitions 1238 - Bermuda: several 1917 through 1956 transitions 1239 - Belize: several 1942 through 1968 transitions 1240 - Ghana: several 1915 through 1956 transitions 1241 - Israel and Palestine: several 1940 through 1985 transitions 1242 - Kenya and adjacent: several 1908 through 1960 transitions 1243 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1244 through 1919 transitions 1245 - Seychelles: the introduction of standard time in 1907, not 1906 1246 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1247 (Thanks to P Chan.) 1248 1249 Because of the Australia change, Australia/Currie (King Island) is 1250 no longer needed, as it is identical to Australia/Hobart for all 1251 timestamps since 1970 and was therefore created by mistake. 1252 Australia/Currie has been moved to the 'backward' file and its 1253 corrected data moved to the 'backzone' file. 1254 1255 Changes to past time zone abbreviations and DST flags 1256 1257 To better match legislation in Turks and Caicos, the 2015 shift to 1258 year-round observance of -04 is now modeled as AST throughout before 1259 returning to Eastern Time with US DST in 2018, rather than as 1260 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1261 1262 Changes to documentation 1263 1264 The zic man page now documents zic's coalescing of transitions 1265 when a zone falls back just before DST springs forward. 1266 1267 1268 Release 2020d - 2020-10-21 11:24:13 -0700 1269 1270 Briefly: 1271 Palestine ends DST earlier than predicted, on 2020-10-24. 1272 1273 Changes to past and future timestamps 1274 1275 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1276 as previously predicted (thanks to Sharef Mustafa.) Its 1277 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1278 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1279 its spring 2020 transition was on March 28 at 00:00, not March 27 1280 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1281 Asia/Hebron. Assume future spring and fall transitions will be on 1282 the Saturday preceding the last Sunday of March and October, 1283 respectively. 1284 1285 1286 Release 2020c - 2020-10-16 11:15:53 -0700 1287 1288 Briefly: 1289 Fiji starts DST later than usual, on 2020-12-20. 1290 1291 Changes to future timestamps 1292 1293 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1294 previously predicted. DST will still end on 2021-01-17. 1295 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1296 the later-than-usual start date is a one-time departure from the 1297 recent pattern. 1298 1299 Changes to build procedure 1300 1301 Rearguard tarballs now contain an empty file pacificnew. 1302 Some older downstream software expects this file to exist. 1303 (Problem reported by Mike Cullinan.) 1304 1305 1306 Release 2020b - 2020-10-06 18:35:04 -0700 1307 1308 Briefly: 1309 Revised predictions for Morocco's changes starting in 2023. 1310 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1311 Macquarie Island has stayed in sync with Tasmania since 2011. 1312 Casey, Antarctica is at +08 in winter and +11 in summer. 1313 zic no longer supports -y, nor the TYPE field of Rules. 1314 1315 Changes to future timestamps 1316 1317 Morocco's spring-forward after Ramadan is now predicted to occur 1318 no sooner than two days after Ramadan, instead of one day. 1319 (Thanks to Milamber.) The first altered prediction is for 2023, 1320 now predicted to spring-forward on April 30 instead of April 23. 1321 1322 Changes to past and future timestamps 1323 1324 Casey Station, Antarctica has been using +08 in winter and +11 in 1325 summer since 2018. The most recent transition from +08 to +11 was 1326 2020-10-04 00:01. Also, Macquarie Island has been staying in 1327 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1328 1329 Changes to past and future time zone abbreviations and DST flags 1330 1331 Canada's Yukon, represented by America/Whitehorse and 1332 America/Dawson, changes its time zone rules from -08/-07 to 1333 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1334 This change affects only the time zone abbreviation (MST vs PDT) 1335 and daylight saving flag for the period between the two dates. 1336 (Thanks to Andrew G. Smith.) 1337 1338 Changes to past timestamps 1339 1340 Correct several transitions for Hungary for 1918/1983. 1341 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1342 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1343 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1344 1345 The 1891 French transition was on March 16, not March 15. The 1346 1911-03-11 French transition was at midnight, not a minute later. 1347 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1348 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1349 1350 Changes to code 1351 1352 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1353 removed and, with it, so has support for the TYPE field in Rule 1354 lines, which is now reserved for compatibility with earlier zic. 1355 These features were previously deprecated in release 2015f. 1356 (Thanks to Tim Parenti.) 1357 1358 zic now defaults to '-b slim' instead of to '-b fat'. 1359 1360 zic's new '-l -' and '-p -' options uninstall any existing 1361 localtime and posixrules files, respectively. 1362 1363 The undocumented and ineffective tzsetwall function has been 1364 removed. 1365 1366 Changes to build procedure 1367 1368 The Makefile now defaults POSIXRULES to '-', so the posixrules 1369 feature (obsolete as of 2019b) is no longer installed by default. 1370 1371 Changes to documentation and commentary 1372 1373 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1374 been removed from the distribution. (Thanks to Tim Parenti.) 1375 1376 1377 Release 2020a - 2020-04-23 16:03:47 -0700 1378 1379 Briefly: 1380 Morocco springs forward on 2020-05-31, not 2020-05-24. 1381 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1382 America/Nuuk renamed from America/Godthab. 1383 zic now supports expiration dates for leap second lists. 1384 1385 Changes to future timestamps 1386 1387 Morocco's second spring-forward transition in 2020 will be May 31, 1388 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1389 Adjust future-year predictions to use the first Sunday after the 1390 day after Ramadan, not the first Sunday after Ramadan. 1391 1392 Canada's Yukon, represented by America/Whitehorse and 1393 America/Dawson, advanced to -07 year-round, beginning with its 1394 spring-forward transition on 2020-03-08, and will not fall back on 1395 2020-11-01. Although a government press release calls this 1396 "permanent Pacific Daylight Saving Time", we prefer MST for 1397 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1398 (Thanks to Tim Parenti.) 1399 1400 Changes to past timestamps 1401 1402 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1403 1404 Changes to timezone identifiers 1405 1406 To reflect current usage in English better, America/Godthab has 1407 been renamed to America/Nuuk. A backwards-compatibility link 1408 remains for the old name. 1409 1410 Changes to code 1411 1412 localtime.c no longer mishandles timestamps after the last 1413 transition in a TZif file with leap seconds and with daylight 1414 saving time transitions projected into the indefinite future. 1415 For example, with TZ='America/Los_Angeles' with leap seconds, 1416 zdump formerly reported a DST transition on 2038-03-14 1417 from 01:59:32.999... to 02:59:33 instead of the correct transition 1418 from 01:59:59.999... to 03:00:00. 1419 1420 zic -L now supports an Expires line in the leapseconds file, and 1421 truncates the TZif output accordingly. This propagates leap 1422 second expiration information into the TZif file, and avoids the 1423 abovementioned localtime.c bug as well as similar bugs present in 1424 many client implementations. If no Expires line is present, zic 1425 -L instead truncates the TZif output based on the #expires comment 1426 present in leapseconds files distributed by tzdb 2018f and later; 1427 however, this usage is obsolescent. For now, the distributed 1428 leapseconds file has an Expires line that is commented out, so 1429 that the file can be fed to older versions of zic which ignore the 1430 commented-out line. Future tzdb distributions are planned to 1431 contain a leapseconds file with an Expires line. 1432 1433 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1434 set to 1 if the system library supports the feature, and 2 if not. 1435 As before, these macros are nonzero if tzcode should support the 1436 feature, zero otherwise. 1437 1438 The configuration macro ALTZONE now has the same values with the 1439 same meaning as HAVE_TZNAME and USG_COMPAT. 1440 1441 The code's defense against CRLF in leap-seconds.list is now 1442 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1443 1444 Although the undocumented tzsetwall function is not changed in 1445 this release, it is now deprecated in preparation for removal in 1446 future releases. Due to POSIX requirements, tzsetwall has not 1447 worked for some time. Any code that uses it should instead use 1448 tzalloc(NULL) or, if portability trumps thread-safety, should 1449 unset the TZ environment variable. 1450 1451 Changes to commentary 1452 1453 The les-de-la-Madeleine and the Listuguj reserve are noted as 1454 following America/Halifax, and comments about Yukon's "south" and 1455 "north" have been corrected to say "east" and "west". (Thanks to 1456 Jeffery Nichols.) 1457 1458 1459 Release 2019c - 2019-09-11 08:59:48 -0700 1460 1461 Briefly: 1462 Fiji observes DST from 2019-11-10 to 2020-01-12. 1463 Norfolk Island starts observing Australian-style DST. 1464 1465 Changes to future timestamps 1466 1467 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1468 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1469 Adjust future guesses accordingly. 1470 1471 Norfolk Island will observe Australian-style DST starting in 1472 spring 2019. The first transition is on 2019-10-06. (Thanks to 1473 Kyle Czech and Michael Deckers.) 1474 1475 Changes to past timestamps 1476 1477 Many corrections to time in Turkey from 1940 through 1985. 1478 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1479 1480 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1481 time, not 02:00 DST. (Thanks to Michael Deckers.) 1482 1483 South Korea observed DST from 1948 through 1951. Although this 1484 info was supposed to appear in release 2014j, a typo inadvertently 1485 suppressed the change. (Thanks to Alois Treindl.) 1486 1487 Detroit observed DST in 1967 and 1968 following the US DST rules, 1488 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1489 Alois Treindl for pointing out that the old data entries were 1490 probably wrong.) 1491 1492 Fix several errors in pre-1970 transitions in Perry County, IN. 1493 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1494 1495 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1496 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1497 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1498 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1499 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1500 Knigsberg switched to +03 on 04-07 not 01-01. 1501 1502 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1503 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1504 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1505 1506 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1507 (Thanks to Michael Deckers.) 1508 1509 Changes to past time zone abbreviations and DST flags 1510 1511 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1512 is now flagged as DST and is abbreviated HKWT not HKT. 1513 1514 Changes to code 1515 1516 leapseconds.awk now relies only on its input data, rather than 1517 also relying on its comments. (Inspired by code from Dennis 1518 Ferguson and Chris Woodbury.) 1519 1520 The code now defends against CRLFs in leap-seconds.list. 1521 (Thanks to Brian Inglis and Chris Woodbury.) 1522 1523 Changes to documentation and commentary 1524 1525 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1526 1527 Nashville's newspapers dueled about the time of day in the 1950s. 1528 (Thanks to John Seigenthaler.) 1529 1530 Liechtenstein observed Swiss DST in 1941/2. 1531 (Thanks to Alois Treindl.) 1532 1533 1534 Release 2019b - 2019-07-01 00:09:53 -0700 1535 1536 Briefly: 1537 Brazil no longer observes DST. 1538 'zic -b slim' outputs smaller TZif files; please try it out. 1539 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1540 1541 Changes to future timestamps 1542 1543 Brazil has canceled DST and will stay on standard time indefinitely. 1544 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1545 Oliveira.) 1546 1547 Predictions for Morocco now go through 2087 instead of 2037, to 1548 work around a problem on newlib when using TZif files output by 1549 zic 2019a or earlier. (Problem reported by David Gauchard.) 1550 1551 Changes to past and future timestamps 1552 1553 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1554 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1555 future transitions to be March's last Friday at 00:00. 1556 1557 Changes to past timestamps 1558 1559 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1560 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1561 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1562 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1563 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1564 In 1947 its fall-back transition was on 11-30, not 12-30. 1565 (Thanks to P Chan.) 1566 1567 Changes to past time zone abbreviations 1568 1569 Italy's 1866 transition to Rome Mean Time was on December 12, not 1570 September 22. This affects only the time zone abbreviation for 1571 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1572 Luigi Rosa.) 1573 1574 Changes affecting metadata only 1575 1576 Add info about the Crimea situation in zone1970.tab and zone.tab. 1577 (Problem reported by Serhii Demediuk.) 1578 1579 Changes to code 1580 1581 zic's new -b option supports a way to control data bloat and to 1582 test for year-2038 bugs in software that reads TZif files. 1583 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1584 for example, changing from fat to slim shrinks the Europe/London 1585 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1586 files represent the same set of timestamps and use the same TZif 1587 format as documented in tzfile(5) and in Internet RFC 8536. 1588 Fat format attempts to work around bugs or incompatibilities in 1589 older software, notably software that mishandles 64-bit TZif data 1590 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1591 Slim format is more efficient and does not work around 64-bit bugs 1592 or obsolete TZ strings. Currently zic defaults to fat format 1593 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1594 out-of-the-box default is intended to change in future releases 1595 as the buggy software often mishandles timestamps anyway. 1596 1597 zic no longer treats a set of rules ending in 2037 specially. 1598 Previously, zic assumed that such a ruleset meant that future 1599 timestamps could not be predicted, and therefore omitted a 1600 POSIX-like TZ string in the TZif output. The old behavior is no 1601 longer needed for current tzdata, and caused problems with newlib 1602 when used with older tzdata (reported by David Gauchard). 1603 1604 zic no longer generates some artifact transitions. For example, 1605 Europe/London no longer has a no-op transition in January 1996. 1606 1607 Changes to build procedure 1608 1609 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1610 by a percent or so. 1611 1612 Changes to documentation and commentary 1613 1614 The Makefile now documents the POSIXRULES macro as being obsolete, 1615 and similarly, zic's -p POSIXRULES option is now documented as 1616 being obsolete. Although the POSIXRULES feature still exists and 1617 works as before, in practice it is rarely used for its intended 1618 purpose, and it does not work either in the default reference 1619 implementation (for timestamps after 2037) or in common 1620 implementations such as GNU/Linux (for contemporary timestamps). 1621 Since POSIXRULES was designed primarily as a temporary transition 1622 facility for System V platforms that died off decades ago, it is 1623 being decommissioned rather than institutionalized. 1624 1625 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1626 1627 1628 Release 2019a - 2019-03-25 22:01:33 -0700 1629 1630 Briefly: 1631 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1632 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1633 1634 Changes to past and future timestamps 1635 1636 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1637 previously predicted. Adjust our prediction by guessing that spring 1638 transitions will be between 24 and 30 March, which matches recent practice 1639 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1640 1641 Metlakatla ended its observance of Pacific standard time, 1642 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1643 Stanley and Tim Parenti.) 1644 1645 Changes to past timestamps 1646 1647 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1648 (Thanks to Alois Treindl and Isaac Starkman.) 1649 1650 Changes to time zone abbreviations 1651 1652 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1653 of being a separate zone that generates the abbreviation "UCT", 1654 which nowadays is typically a typo. (Problem reported by Isiah 1655 Meadows.) 1656 1657 Changes to code 1658 1659 zic now has an -r option to limit the time range of output data. 1660 For example, 'zic -r @1000000000' limits the output data to 1661 timestamps starting 1000000000 seconds after the Epoch. 1662 This helps shrink output size and can be useful for applications 1663 not needing the full timestamp history, such as TZDIST truncation; 1664 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1665 from Christopher Wong, helped along by bug reports from Wong and 1666 from Tim Parenti.) 1667 1668 Changes to documentation 1669 1670 Mention Internet RFC 8536 (February 2019), which documents TZif. 1671 1672 tz-link.html now cites tzdata-meta 1673 <https://tzdata-meta.timtimeonline.com/>. 1674 1675 1676 Release 2018i - 2018-12-30 11:05:43 -0800 1677 1678 Briefly: 1679 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1680 1681 Changes to future timestamps 1682 1683 Due to a change in government, So Tom and Prncipe switches back 1684 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1685 Nasardinov and Michael Deckers.) 1686 1687 1688 Release 2018h - 2018-12-23 17:59:32 -0800 1689 1690 Briefly: 1691 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1692 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1693 Metlakatla, Alaska observes PST this winter only. 1694 Guess Morocco will continue to adjust clocks around Ramadan. 1695 Add predictions for Iran from 2038 through 2090. 1696 1697 Changes to future timestamps 1698 1699 Guess that Morocco will continue to fall back just before and 1700 spring forward just after Ramadan, the practice since 2012. 1701 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1702 negative DST during Ramadan in main and vanguard formats, and in 1703 rearguard format it stays in the +00 timezone and observes 1704 ordinary DST in all months other than Ramadan. As before, extend 1705 this guesswork to the year 2037. As a consequence, Morocco is 1706 scheduled to observe three DST transitions in some Gregorian years 1707 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1708 calendars. 1709 1710 The table of exact transitions for Iranian DST has been extended. 1711 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1712 It now cuts off before 2091 as there is doubt about how the Persian 1713 calendar will treat 2091. This change predicts DST transitions in 1714 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1715 predicted. As before, post-cutoff transitions are approximated. 1716 1717 Changes to past and future timestamps 1718 1719 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1720 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1721 Kostanay) did not switch, so create a zone Asia/Qostanay. 1722 1723 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1724 It did not change clocks that day and remains on -08 this winter. 1725 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1726 rules next spring, so this change affects only timestamps 1727 from 2018-11-04 through 2019-03-10. 1728 1729 Change to past timestamps 1730 1731 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1732 not 00:00. I transcribed the time incorrectly from Shanks. 1733 (Thanks to Phake Nick.) 1734 1735 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1736 (Thanks to Phake Nick.) 1737 1738 Guam observed DST irregularly from 1959 through 1977. 1739 (Thanks to Phake Nick.) 1740 1741 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1742 10-01 changed standard time to +08:30 (not +08). Its transition 1743 back to +08 after WWII was on 1945-09-15, not the previous day. 1744 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1745 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1746 its 1952 fallback was on 11-02 (not 10-25). 1747 1748 This release contains many changes to timestamps before 1946 due 1749 to Japanese possession or occupation of Pacific/Chuuk, 1750 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1751 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1752 (Thanks to Phake Nick.) 1753 1754 Assume that the Spanish East Indies was like the Philippines and 1755 observed American time until the end of 1844. This affects 1756 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1757 1758 Changes to past tm_isdst flags 1759 1760 For the recent Morocco change, the tm_isdst flag should be 1 from 1761 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1762 Give a URL to the official decree. (Thanks to Matt Johnson.) 1763 1764 1765 Release 2018g - 2018-10-26 22:22:45 -0700 1766 1767 Briefly: 1768 Morocco switches to permanent +01 on 2018-10-28. 1769 1770 Changes to future timestamps 1771 1772 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1773 so its clocks will not fall back as previously scheduled. 1774 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1775 1776 Changes to code 1777 1778 When generating TZif files with leap seconds, zic no longer uses a 1779 format that trips up older 32-bit clients, fixing a bug introduced 1780 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1781 for QTBUG-53071 now also works for TZif files with leap seconds. 1782 1783 The translator to rearguard format now rewrites the line 1784 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1785 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1786 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1787 and earlier. (Reported by Christos Zoulas.) 1788 1789 Changes to past time zone abbreviations 1790 1791 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1792 This reverts to 2011h, as the abbreviation change in 2011i was 1793 likely inadvertent. 1794 1795 Changes to documentation 1796 1797 tzfile.5 has new sections on interoperability issues. 1798 1799 1800 Release 2018f - 2018-10-18 00:14:18 -0700 1801 1802 Briefly: 1803 Volgograd moves from +03 to +04 on 2018-10-28. 1804 Fiji ends DST 2019-01-13, not 2019-01-20. 1805 Most of Chile changes DST dates, effective 2019-04-06. 1806 1807 Changes to future timestamps 1808 1809 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1810 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1811 1812 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1813 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1814 accordingly. 1815 1816 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1817 time, and resume DST on the first Saturday in September at 24:00 mainland 1818 time. The changes are effective from 2019-04-06, and do not affect the 1819 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1820 and Tim Parenti.) Adjust future predictions accordingly. 1821 1822 Changes to past timestamps 1823 1824 The 2018-05-05 North Korea 30-minute time zone change took place 1825 at 23:30 the previous day, not at 00:00 that day. 1826 1827 China's 1988 spring-forward transition was on April 17, not 1828 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1829 (Thanks to P Chan.) 1830 1831 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1832 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1833 temporarily switched to +09/+10 during World War II. Macau 1834 observed DST in 1942/79, not 1961/80, and there were several 1835 errors for transition times and dates. (Thanks to P Chan.) 1836 1837 The 1948-1951 fallback transitions in Japan were at 25:00 on 1838 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1839 zic turns this into 01:00 on the day after September's second 1840 Saturday, which is the best that POSIX or C platforms can do. 1841 1842 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1843 paper by Li Yu, replacing more-questionable data from Shanks. 1844 1845 Changes to time zone abbreviations 1846 1847 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1848 1849 Changes to code 1850 1851 zic now always generates TZif files where time type 0 is used for 1852 timestamps before the first transition. This simplifies the 1853 reading of TZif files and should not affect behavior of existing 1854 TZif readers because the same set of time types is used; only 1855 their internal indexes may have changed. This affects only the 1856 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1857 EET, which previously used nonzero types for these timestamps. 1858 1859 Because of the type 0 change, zic no longer outputs a dummy 1860 transition at time -2**59 (before the Big Bang), as clients should 1861 no longer need this to handle historical timestamps correctly. 1862 This reverts a change introduced in 2013d and shrinks most TZif 1863 files by a few bytes. 1864 1865 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1866 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1867 occurs at 18:00 on the Saturday before the last Sunday in April. 1868 This behavior was documented in 2018a but the code did not 1869 entirely match the documentation. 1870 1871 localtime.c no longer requires at least one time type in TZif 1872 files that lack transitions or have a POSIX-style TZ string. This 1873 future-proofs the code against possible future extensions to the 1874 format that would allow TZif files with POSIX-style TZ strings and 1875 without transitions or time types. 1876 1877 A read-access subscript error in localtime.c has been fixed. 1878 It could occur only in TZif files with timecnt == 0, something that 1879 does not happen in practice now but could happen in future versions. 1880 1881 localtime.c no longer ignores TZif POSIX-style TZ strings that 1882 specify only standard time. Instead, these TZ strings now 1883 override the default time type for timestamps after the last 1884 transition (or for all timestamps if there are no transitions), 1885 just as DST strings specifying DST have always done. 1886 1887 leapseconds.awk now outputs "#updated" and "#expires" comments, 1888 and supports leap seconds at the ends of months other than June 1889 and December. (Inspired by suggestions from Chris Woodbury.) 1890 1891 Changes to documentation 1892 1893 New restrictions: A Rule name must start with a character that 1894 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1895 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1896 The latter restriction makes room for future extensions (a 1897 possibility noted by Tom Lane). 1898 1899 tzfile.5 now documents what time types apply before the first and 1900 after the last transition, if any. 1901 1902 Documentation now uses the spelling "timezone" for a TZ setting 1903 that determines timestamp history, and "time zone" for a 1904 geographic region currently sharing the same standard time. 1905 1906 The name "TZif" is now used for the tz binary data format. 1907 1908 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1909 (Thanks to Aldrin Martoq for the link.) 1910 1911 Changes to build procedure 1912 1913 New 'make' target 'rearguard_tarballs' to build the rearguard 1914 tarball only. This is a convenience on platforms that lack lzip 1915 if you want to build the rearguard tarball. (Problem reported by 1916 Deborah Goldsmith.) 1917 1918 tzdata.zi is now more stable from release to release. (Problem 1919 noted by Tom Lane.) It is also a bit shorter. 1920 1921 tzdata.zi now can contain comment lines documenting configuration 1922 information, such as which data format was selected, which input 1923 files were used, and how leap seconds are treated. (Problems 1924 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1925 are used these comment lines are absent, for backward 1926 compatibility. A redistributor intending to alter its copy of the 1927 files should also append "-LABEL" to the 'version' file's first 1928 line, where "LABEL" identifies the redistributor's change. 1929 1930 1931 Release 2018e - 2018-05-01 23:42:51 -0700 1932 1933 Briefly: 1934 1935 North Korea switches back to +09 on 2018-05-05. 1936 The main format uses negative DST again, for Ireland etc. 1937 'make tarballs' now also builds a rearguard tarball. 1938 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1939 1940 Changes to past and future timestamps 1941 1942 North Korea switches back from +0830 to +09 on 2018-05-05. 1943 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1944 and Tim Parenti.) 1945 1946 Bring back the negative-DST changes of 2018a, except be more 1947 compatible with data parsers that do not support negative DST. 1948 Also, this now affects historical timestamps in Namibia and the 1949 former Czechoslovakia, not just Ireland. The main format now uses 1950 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1951 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1952 does not affect UT offsets, only time zone abbreviations and the 1953 tm_isdst flag. Also, this does not affect rearguard or vanguard 1954 formats; effectively the main format now uses vanguard instead of 1955 rearguard format. Data parsers that do not support negative DST 1956 can still use data from the rearguard tarball described below. 1957 1958 Changes to build procedure 1959 1960 The command 'make tarballs' now also builds the tarball 1961 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1962 except that it uses rearguard format intended for trailing-edge 1963 data parsers. 1964 1965 Changes to data format and to code 1966 1967 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1968 suffix, which specifies whether the adjusted time is standard time 1969 or daylight saving time. If no suffix is given, daylight saving 1970 time is used if and only if the SAVE column is nonzero; this is 1971 the longstanding behavior. Although this new feature is not used 1972 in tzdata, it could be used to specify the legal time in Namibia 1973 1994-2017, as opposed to the popular time (see below). 1974 1975 Changes to past timestamps 1976 1977 From 1994 through 2017 Namibia observed DST in winter, not summer. 1978 That is, it used negative DST, as Ireland still does. This change 1979 does not affect UTC offsets; it affects only the tm_isdst flag and 1980 the abbreviation used during summer, which is now CAT, not WAST. 1981 Although (as noted by Michael Deckers) summer and winter time were 1982 both simply called "standard time" in Namibian law, in common 1983 practice winter time was considered to be DST (as noted by Stephen 1984 Colebourne). The full effect of this change is only in vanguard 1985 and main format; in rearguard format, the tm_isdst flag is still 1986 zero in winter and nonzero in summer. 1987 1988 In 1946/7 Czechoslovakia also observed negative DST in winter. 1989 The full effect of this change is only in vanguard and main 1990 formats; in rearguard format, it is modeled as plain GMT without 1991 daylight saving. Also, the dates of some 1944/5 DST transitions 1992 in Czechoslovakia have been changed. 1993 1994 1995 Release 2018d - 2018-03-22 07:05:46 -0700 1996 1997 Briefly: 1998 1999 Palestine starts DST a week earlier in 2018. 2000 Add support for vanguard and rearguard data consumers. 2001 Add subsecond precision to source data format, though not to data. 2002 2003 Changes to future timestamps 2004 2005 In 2018, Palestine starts DST on March 24, not March 31. 2006 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2007 2008 Changes to past and future timestamps 2009 2010 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2011 at 04:00. (Thanks to Steffen Thorsen.) 2012 2013 Changes to past timestamps 2014 2015 Historical transitions for Uruguay, represented by 2016 America/Montevideo, have been updated per official legal documents, 2017 replacing previous data mainly originating from the inventions of 2018 Shanks & Pottenger. This has resulted in adjustments ranging from 2019 30 to 90 minutes in either direction over at least two dozen 2020 distinct periods ranging from one day to several years in length. 2021 A mere handful of pre-1991 transitions are unaffected; data since 2022 then has come from more reliable contemporaneous reporting. These 2023 changes affect various timestamps in 1920-1923, 1936, 1939, 2024 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2025 Additionally, Uruguay's pre-standard-time UT offset has been 2026 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2027 match the location of the Observatory of the National Meteorological 2028 Institute in Montevideo. 2029 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2030 2031 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2032 (Thanks to Kerry Shetline.) 2033 2034 Fix the 1912-01-01 transition for Portugal and its colonies. 2035 This transition was at 00:00 according to the new UT offset, not 2036 according to the old one. Also assume that Cape Verde switched on 2037 the same date as the rest, not in 1907. This affects 2038 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2039 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2040 (Thanks to Michael Deckers.) 2041 2042 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2043 Turks & Caicos. 2044 2045 Changes to past time zone abbreviations 2046 2047 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2048 is no clock change associated with the transition. 2049 2050 Changes to build procedure 2051 2052 The new DATAFORM macro in the Makefile lets the installer choose 2053 among three source data formats. The idea is to lessen downstream 2054 disruption when data formats are improved. 2055 2056 * DATAFORM=vanguard installs from the latest, bleeding-edge 2057 format. DATAFORM=main (the default) installs from the format 2058 used in the 'africa' etc. files. DATAFORM=rearguard installs 2059 from a trailing-edge format. Eventually, elements of today's 2060 vanguard format should move to the main format, and similarly 2061 the main format's features should eventually move to the 2062 rearguard format. 2063 2064 * In the current version, the main and rearguard formats are 2065 identical and match that of 2018c, so this change does not 2066 affect default behavior. The vanguard format currently contains 2067 one feature not in the main format: negative SAVE values. This 2068 improves support for Ireland, which uses Irish Standard Time 2069 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2070 supported negative SAVE values for decades, and this feature 2071 should move to the main format soon. However, it will not move 2072 to the rearguard format for quite some time because some 2073 downstream parsers do not support it. 2074 2075 * The build procedure constructs three files vanguard.zi, main.zi, 2076 and rearguard.zi, one for each format. Although the files 2077 represent essentially the same data, they may have minor 2078 discrepancies that users are not likely to notice. The files 2079 are intended for downstream data consumers and are not 2080 installed. Zoneinfo parsers that do not support negative SAVE values 2081 should start using rearguard.zi, so that they will be unaffected 2082 when the negative-DST feature moves from vanguard to main. 2083 Bleeding-edge Zoneinfo parsers that support the new features 2084 already can use vanguard.zi; in this respect, current tzcode is 2085 bleeding-edge. 2086 2087 The Makefile should now be safe for parallelized builds, and 'make 2088 -j to2050new.tzs' is now much faster on a multiprocessor host 2089 with GNU Make. 2090 2091 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2092 prepends TZDIR/ to file names that do not begin with '/'. This is 2093 not recommended for general use, due to its security implications. 2094 (From a suggestion by Manuela Friedrich.) 2095 2096 Changes to code 2097 2098 zic now accepts subsecond precision in expressions like 2099 00:19:32.13, which is approximately the legal time of the 2100 Netherlands from 1835 to 1937. However, because it is 2101 questionable whether the few recorded uses of non-integer offsets 2102 had subsecond precision in practice, there are no plans for tzdata 2103 to use this feature. (Thanks to Steve Allen for pointing out 2104 the limitations of historical data in this area.) 2105 2106 The code is a bit more portable to MS-Windows. Installers can 2107 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2108 reserve identifiers like 'localtime'. (Thanks to Manuela 2109 Friedrich.) 2110 2111 Changes to documentation and commentary 2112 2113 theory.html now outlines tzdb's extensions to POSIX's model for 2114 civil time, and has a section "POSIX features no longer needed" 2115 that lists POSIX API components that are now vestigial. 2116 (From suggestions by Steve Summit.) It also better distinguishes 2117 time zones from tz regions. (From a suggestion by Guy Harris.) 2118 2119 Commentary is now more consistent about using the phrase "daylight 2120 saving time", to match the C name tm_isdst. Daylight saving time 2121 need not occur in summer, and need not have a positive offset from 2122 standard time. 2123 2124 Commentary about historical transitions in Uruguay has been expanded 2125 with links to many relevant legal documents. 2126 (Thanks to Tim Parenti.) 2127 2128 Commentary now uses some non-ASCII characters with Unicode value 2129 less than U+0100, as they can be useful and should work even with 2130 older editors such as XEmacs. 2131 2132 2133 Release 2018c - 2018-01-22 23:00:44 -0800 2134 2135 Briefly: 2136 Revert Irish changes that relied on negative SAVE values. 2137 2138 Changes to tm_isdst 2139 2140 Revert the 2018a change to Europe/Dublin. As before, this change 2141 does not affect UT offsets or abbreviations; it affects only 2142 whether timestamps are considered to be standard time or 2143 daylight-saving time, as expressed in the tm_isdst flag of C's 2144 struct tm type. This reversion is intended to be a temporary 2145 workaround for problems discovered with downstream uses of 2146 releases 2018a and 2018b, which implemented Irish time by using 2147 negative SAVE values in the Eire rules of the 'europe' file. 2148 Although negative SAVE values have been part of tzcode for many 2149 years and are supported by many platforms, they were not 2150 documented before 2018a and ICU and OpenJDK do not currently 2151 support them. A mechanism to export data to platforms lacking 2152 support for negative DST is planned to be developed before the 2153 change is reapplied. (Problems reported by Deborah Goldsmith and 2154 Stephen Colebourne.) 2155 2156 Changes to past timestamps 2157 2158 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2159 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2160 2161 Changes to build procedure 2162 2163 The build procedure now works around mawk 1.3.3's lack of support 2164 for character class expressions. (Problem reported by Ohyama.) 2165 2166 2167 Release 2018b - 2018-01-17 23:24:48 -0800 2168 2169 Briefly: 2170 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2171 2172 Changes to build procedure 2173 2174 The distribution now contains the file 'pacificnew' again. 2175 This file was inadvertently omitted in the 2018a distribution. 2176 (Problem reported by Matias Fonzo.) 2177 2178 2179 Release 2018a - 2018-01-12 22:29:21 -0800 2180 2181 Briefly: 2182 So Tom and Prncipe switched from +00 to +01. 2183 Brazil's DST will now start on November's first Sunday. 2184 Ireland's standard time is now in the summer, not the winter. 2185 Use Debian-style installation locations, instead of 4.3BSD-style. 2186 New zic option -t. 2187 2188 Changes to past and future timestamps 2189 2190 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 2191 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2192 2193 Changes to future timestamps 2194 2195 Starting in 2018 southern Brazil will begin DST on November's 2196 first Sunday instead of October's third Sunday. (Thanks to 2197 Steffen Thorsen.) 2198 2199 Changes to past timestamps 2200 2201 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2202 been corrected. The 'backzone' and 'zone.tab' files did not agree 2203 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2204 Michael Deckers.) 2205 2206 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2207 BST instead of BOST, to be more consistent with the convention 2208 used for Latvian Summer Time (1918-9) and for British Summer Time. 2209 2210 Changes to tm_isdst 2211 2212 Change Europe/Dublin so that it observes Irish Standard Time (UT 2213 +01) in summer and GMT (as negative daylight-saving) in winter, 2214 instead of observing standard time (GMT) in winter and Irish 2215 Summer Time (UT +01) in summer. This change does not affect UT 2216 offsets or abbreviations; it affects only whether timestamps are 2217 considered to be standard time or daylight-saving time, as 2218 expressed in the tm_isdst flag of C's struct tm type. 2219 (Discrepancy noted by Derick Rethans.) 2220 2221 Changes to build procedure 2222 2223 The default installation locations have been changed to mostly 2224 match Debian circa 2017, instead of being designed as an add-on to 2225 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2226 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2227 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2228 locations more precisely. (This responds to suggestions from 2229 Brian Inglis and from Steve Summit.) 2230 2231 The default installation procedure no longer creates the 2232 backward-compatibility link US/Pacific-New, which causes 2233 confusion during user setup (e.g., see Debian bug 815200). 2234 Use 'make BACKWARD="backward pacificnew"' to create the link 2235 anyway, for now. Eventually we plan to remove the link entirely. 2236 2237 tzdata.zi now contains a version-number comment. 2238 (Suggested by Tom Lane.) 2239 2240 The Makefile now quotes values like BACKWARD more carefully when 2241 passing them to the shell. (Problem reported by Zefram.) 2242 2243 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2244 that have snprintf and use pre-C99 compilers. (Problem reported 2245 by Jon Skeet.) 2246 2247 Changes to code 2248 2249 zic has a new option -t FILE that specifies the location of the 2250 file that determines local time when TZ is unset. The default for 2251 this location can be configured via the new TZDEFAULT makefile 2252 macro, which defaults to /etc/localtime. 2253 2254 Diagnostics and commentary now distinguish UT from UTC more 2255 carefully; see theory.html for more information about UT vs UTC. 2256 2257 zic has been ported to GCC 8's -Wstringop-truncation option. 2258 (Problem reported by Martin Sebor.) 2259 2260 Changes to documentation and commentary 2261 2262 The zic man page now documents the longstanding behavior that 2263 times and years can be out of the usual range, with negative times 2264 counting backwards from midnight and with year 0 preceding year 1. 2265 (Problem reported by Michael Deckers.) 2266 2267 The theory.html file now mentions the POSIX limit of six chars 2268 per abbreviation, and lists alphabetic abbreviations used. 2269 2270 The files tz-art.htm and tz-link.htm have been renamed to 2271 tz-art.html and tz-link.html, respectively, for consistency with 2272 other file names and to simplify web server configuration. 2273 2274 2275 Release 2017c - 2017-10-20 14:49:34 -0700 2276 2277 Briefly: 2278 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2279 Fiji ends DST 2018-01-14, not 2018-01-21. 2280 Namibia switches from +01/+02 to +02 on 2018-04-01. 2281 Sudan switches from +03 to +02 on 2017-11-01. 2282 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2283 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2284 A new file tzdata.zi now holds a small text copy of all data. 2285 The zic input format has been regularized slightly. 2286 2287 Changes to future timestamps 2288 2289 Northern Cyprus has decided to resume EU rules starting 2290 2017-10-29, thus reinstituting winter time. 2291 2292 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2293 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2294 accordingly. 2295 2296 Namibia will switch from +01 with DST to +02 all year on 2297 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2298 at 02:00. (Thanks to Steffen Thorsen.) 2299 2300 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2301 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2302 Africa/Juba is no longer a link to Africa/Khartoum. 2303 2304 Tonga has likely ended its experiment with DST, and will not 2305 adjust its clocks on 2017-11-05. Although Tonga has not announced 2306 whether it will continue to observe DST, the IATA is assuming that 2307 it will not. (Thanks to David Wade.) 2308 2309 Turks & Caicos will switch from -04 all year to -05 with US DST on 2310 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2311 at 02:00. (Thanks to Steffen Thorsen.) 2312 2313 Changes to past timestamps 2314 2315 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2316 (Thanks to Arthur David Olson.) 2317 2318 Detroit did not observe DST in 1967. 2319 2320 Use railway time for Asia/Kolkata before 1941, by switching to 2321 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2322 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2323 2324 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2325 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2326 2327 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2328 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2329 2330 Adjust the 1867 transition in Alaska to better reflect the 2331 historical record, by changing it to occur on 1867-10-18 at 15:30 2332 Sitka time rather than at the start of 1867-10-17 local time. 2333 Although strictly speaking this is accurate only for Sitka, 2334 the rest of Alaska's blanks need to be filled in somehow. 2335 2336 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2337 (Thanks to Michael Deckers.) 2338 2339 Add 7 s to the UT offset in Asia/Yangon before 1920. 2340 2341 Changes to zone names 2342 2343 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2344 exceeded the 14-character limit and was an unused misnomer anyway. 2345 2346 Changes to build procedure 2347 2348 To support applications that prefer to read time zone data in text 2349 form, two zic input files tzdata.zi and leapseconds are now 2350 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2351 leapseconds tzdata.zi' can reproduce the tzdata binary files 2352 without and with leap seconds, respectively. To prevent these two 2353 new files from being installed, use 'make TZDATA_TEXT=', and to 2354 suppress leap seconds from the tzdata text installation, use 'make 2355 TZDATA_TEXT=tzdata.zi'. 2356 2357 'make BACKWARD=' now suppresses backward-compatibility names 2358 like 'US/Pacific' that are defined in the 'backward' and 2359 'pacificnew' files. 2360 2361 'make check' now works on systems that lack a UTF-8 locale, 2362 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2363 the name of a UTF-8 locale, if you have one. 2364 2365 Y2K runtime checks are no longer enabled by default. Add 2366 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2367 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2368 to disable them. (New name suggested by Brian Inglis.) 2369 2370 The build procedure for zdump now works on AIX 7.1. 2371 (Problem reported by Kees Dekker.) 2372 2373 Changes to code 2374 2375 zic and the reference runtime now reject multiple leap seconds 2376 within 28 days of each other, or leap seconds before the Epoch. 2377 As a result, support for double leap seconds, which was 2378 obsolescent and undocumented, has been removed. Double leap 2379 seconds were an error in the C89 standard; they have never existed 2380 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2381 noticing glitches in the code that uncovered this problem.) 2382 2383 zic now warns about use of the obsolescent and undocumented -y 2384 option, and about use of the obsolescent TYPE field of Rule lines. 2385 2386 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2387 weekdays; formerly it rejected them due to a bug. Conversely, zic 2388 no longer considers non-prefixes to be abbreviations; for example, 2389 it no longer accepts "lF" as an abbreviation for "lastFriday". 2390 Also, zic warns about the undocumented usage with a "last-" 2391 prefix, e.g., "last-Fri". 2392 2393 Similarly, zic now accepts the unambiguous abbreviation "L" for 2394 "Link" in ordinary context and for "Leap" in leap-second context. 2395 Conversely, zic no longer accepts non-prefixes such as "La" as 2396 abbreviations for words like "Leap". 2397 2398 zic no longer accepts leap second lines in ordinary input, or 2399 ordinary lines in leap second input. Formerly, zic sometimes 2400 warned about this undocumented usage and handled it incorrectly. 2401 2402 The new macro HAVE_TZNAME governs whether the tzname external 2403 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2404 governs only the external variables "timezone" and "daylight". 2405 This change is needed because the three variables are not in the 2406 same category: although POSIX requires tzname, it specifies the 2407 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2408 if not defined, the code attempts to guess it from other macros. 2409 2410 localtime.c and difftime.c no longer require stdio.h, and .c files 2411 other than zic.c no longer require sys/wait.h. 2412 2413 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2414 2415 Calculation of time_t extrema works around a bug in GCC 4.8.4 2416 (Reported by Stan Shebs and Joseph Myers.) 2417 2418 zic.c no longer mistranslates formats of line numbers in non-English 2419 locales. (Problem reported by Benno Schulenberg.) 2420 2421 Several minor changes have been made to the code to make it a 2422 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2423 Dekker for reporting the problems.) 2424 2425 Changes to documentation and commentary 2426 2427 The two new files 'theory.html' and 'calendars' contain the 2428 contents of the removed file 'Theory'. The goal is to document 2429 tzdb theory more accessibly. 2430 2431 The zic man page now documents abbreviation rules. 2432 2433 tz-link.htm now covers how to apply tzdata changes to clients. 2434 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2435 2436 The leap-seconds.list URL has been updated to something that is 2437 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2438 2439 Release 2017b - 2017-03-17 07:30:38 -0700 2440 2441 Briefly: Haiti has resumed DST. 2442 2443 Changes to past and future timestamps 2444 2445 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2446 2447 Changes to past timestamps 2448 2449 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2450 2451 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2452 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2453 2454 Changes to code 2455 2456 The reference localtime implementation now falls back on the 2457 current US daylight-saving transition rules rather than the 2458 1987-2006 rules. This fallback occurs only when (1) the TZ 2459 environment variable has a value like "AST4ADT" that asks 2460 for daylight saving time but does not specify the rules, (2) there 2461 is no file by that name, and (3) the TZDEFRULES file cannot be 2462 loaded. (Thanks to Tom Lane.) 2463 2464 2465 Release 2017a - 2017-02-28 00:05:36 -0800 2466 2467 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2468 discontinues DST. 2469 2470 Changes to future timestamps 2471 2472 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2473 2474 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2475 Its clocks diverge from America/Santiago starting 2017-05-13 at 2476 23:00, hiving off a new zone America/Punta_Arenas. Although the 2477 Chilean government says this change expires in May 2019, for now 2478 assume it's permanent. (Thanks to Juan Correa and Deborah 2479 Goldsmith.) This also affects Antarctica/Palmer. 2480 2481 Changes to past timestamps 2482 2483 Fix many entries for historical timestamps for Europe/Madrid 2484 before 1979, to agree with tables compiled by Pere Planesas of the 2485 National Astronomical Observatory of Spain. As a side effect, 2486 this changes some timestamps for Africa/Ceuta before 1929, which 2487 are probably guesswork anyway. (Thanks to Steve Allen and 2488 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2489 correcting the 1901 transition.) 2490 2491 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2492 (Thanks to Alois Treindl.) 2493 2494 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2495 (Thanks to Stepan Golosunov.) 2496 2497 Changes to past and future time zone abbreviations 2498 2499 Switch to numeric time zone abbreviations for South America, as 2500 part of the ongoing project of removing invented abbreviations. 2501 This avoids the need to invent an abbreviation for the new Chilean 2502 new zone. Similarly, switch from invented to numeric time zone 2503 abbreviations for Afghanistan, American Samoa, the Azores, 2504 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2505 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2506 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2507 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2508 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2509 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2510 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2511 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2512 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2513 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2514 for half-hour daylight saving time in Belize before 1944 and in 2515 the Dominican Republic before 1975; and for Canary Islands before 2516 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2517 Indian Summer Time before 1942, for Indonesia before around 1964, 2518 for Kenya before 1960, for Liberia before 1973, for Madeira before 2519 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2520 Pakistan before 1971, for Western Sahara before 1977, and for 2521 Zaporozhye in 1880-1924. 2522 2523 For Alaska time from 1900 through 1967, instead of "CAT" use the 2524 abbreviation "AST", the abbreviation commonly used at the time 2525 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2526 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2527 2528 Use "CST" and "CDT" instead of invented abbreviations for Macau 2529 before 1999 and Taiwan before 1938, and use "JST" instead of the 2530 invented abbreviation "JCST" for Japan and Korea before 1938. 2531 2532 Change to database entry category 2533 2534 Move the Pacific/Johnston link from 'australasia' to 'backward', 2535 since Johnston is now uninhabited. 2536 2537 Changes to code 2538 2539 zic no longer mishandles some transitions in January 2038 when it 2540 attempts to work around Qt bug 53071. This fixes a bug affecting 2541 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2542 now contains a workaround, useful when loading a file generated by 2543 a buggy zic. (Problem and localtime.c fix reported by Bradley 2544 White.) 2545 2546 zdump -i now outputs non-hour numeric time zone abbreviations 2547 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2548 with zic %z and with common practice, and simplifies auditing of 2549 zdump output. 2550 2551 zdump is now buildable again with -DUSE_LTZ=0. 2552 (Problem reported by Joseph Myers.) 2553 2554 zdump.c now always includes private.h, to avoid code duplication 2555 with private.h. (Problem reported by Kees Dekker.) 2556 2557 localtime.c no longer mishandles early or late timestamps 2558 when TZ is set to a POSIX-style string that specifies DST. 2559 (Problem reported by Kees Dekker.) 2560 2561 date and strftime now cause %z to generate "-0000" instead of 2562 "+0000" when the UT offset is zero and the time zone abbreviation 2563 begins with "-". 2564 2565 Changes to documentation and commentary 2566 2567 The 'Theory' file now better documents choice of historical time 2568 zone abbreviations. (Problems reported by Michael Deckers.) 2569 2570 tz-link.htm now covers leap smearing, which is popular in clouds. 2571 2572 2573 Release 2016j - 2016-11-22 23:17:13 -0800 2574 2575 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2576 2577 Changes to future timestamps 2578 2579 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2580 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2581 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2582 2583 Changes to past timestamps 2584 2585 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2586 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2587 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2588 2589 Changes to past time zone abbreviations 2590 2591 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2592 summer time before 1948. The old use of "EET" was a typo. 2593 2594 Changes to code 2595 2596 zic no longer mishandles file systems that lack hard links, fixing 2597 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2598 Also, when the destination already contains symbolic links, zic 2599 should now work better on systems where the 'link' system call 2600 does not follow symbolic links. 2601 2602 Changes to documentation and commentary 2603 2604 tz-link.htm now documents the relationship between release version 2605 numbers and development-repository commit tags. (Suggested by 2606 Paul Koning.) 2607 2608 The 'Theory' file now documents UT. 2609 2610 iso3166.tab now accents "Curaao", and commentary now mentions 2611 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2612 2613 2614 Release 2016i - 2016-11-01 23:19:52 -0700 2615 2616 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2617 reintroduces DST on 2016-11-06. 2618 2619 Changes to future timestamps 2620 2621 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2622 2017-01-15 at 03:00. Assume future observances in Tonga will be 2623 from the first Sunday in November through the third Sunday in 2624 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2625 time zone abbreviations for this zone. 2626 2627 Changes to past and future timestamps 2628 2629 Northern Cyprus is now +03 year round, causing a split in Cyprus 2630 time zones starting 2016-10-30 at 04:00. This creates a zone 2631 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2632 2633 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2634 (Thanks to Steffen Thorsen.) 2635 2636 Changes to past timestamps 2637 2638 Several corrections were made for pre-1975 timestamps in Italy. 2639 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2640 Europe/Vatican. 2641 2642 First, the 1893-11-01 00:00 transition in Italy used the new UT 2643 offset (+01), not the old (+00:49:56). (Thanks to Michael 2644 Deckers.) 2645 2646 Second, rules for daylight saving in Italy were changed to agree 2647 with Italy's National Institute of Metrological Research (INRiM) 2648 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2649 Inglis, and Michael Deckers): 2650 2651 The 1916-06-03 transition was at 24:00, not 00:00. 2652 2653 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2654 00:00, not 01:00. 2655 2656 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2657 01:00. 2658 2659 The 1944-09-17 transition was at 03:00, not 01:00. This 2660 particular change is taken from Italian law as INRiM's table, 2661 (which says 02:00) appears to have a typo here. Also, keep the 2662 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2663 Germany then. 2664 2665 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2666 not 00:00. 2667 2668 Changes to code 2669 2670 The code should now be buildable on AmigaOS merely by setting the 2671 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2672 2673 2674 Release 2016h - 2016-10-19 23:17:57 -0700 2675 2676 Changes to future timestamps 2677 2678 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2679 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2680 future fall transitions will be on the last Saturday of October 2681 at 01:00, which is consistent with predicted spring transitions 2682 on the last Saturday of March. (Thanks to Tim Parenti.) 2683 2684 Changes to past timestamps 2685 2686 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2687 not at 02:00, and the spring 1994 transition was on March 20, not 2688 March 27. (Thanks to Kvan Yazan.) 2689 2690 Changes to past and future time zone abbreviations 2691 2692 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2693 instead of alphabetic ones like "IST" and "LKT". Various 2694 English-language sources use "IST", "LKT" and "SLST", with no 2695 working consensus. (Usage of "SLST" mentioned by Sadika 2696 Sumanapala.) 2697 2698 Changes to code 2699 2700 zic no longer mishandles relativizing file names when creating 2701 symbolic links like /etc/localtime, when these symbolic links 2702 are outside the usual directory hierarchy. This fixes a bug 2703 introduced in 2016g. (Problem reported by Andreas Stieger.) 2704 2705 Changes to build procedure 2706 2707 New rules 'traditional_tarballs' and 'traditional_signatures' for 2708 building just the traditional-format distribution. (Requested by 2709 Deborah Goldsmith.) 2710 2711 The file 'version' is now put into the tzdata tarball too. 2712 (Requested by Howard Hinnant.) 2713 2714 Changes to documentation and commentary 2715 2716 The 'Theory' file now has a section on interface stability. 2717 (Requested by Paul Koning.) It also mentions features like 2718 tm_zone and localtime_rz that have long been supported by the 2719 reference code. 2720 2721 tz-link.htm has improved coverage of time zone boundaries suitable 2722 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2723 Johnson.) 2724 2725 The US commentary now mentions Allen and the "day of two noons". 2726 2727 The Fiji commentary mentions the government's 2016-10-03 press 2728 release. (Thanks to Raymond Kumar.) 2729 2730 2731 Release 2016g - 2016-09-13 08:56:38 -0700 2732 2733 Changes to future timestamps 2734 2735 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2736 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2737 than an invented abbreviation for the new time. 2738 2739 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2740 (Thanks to Tim Parenti.) 2741 2742 Changes to past timestamps 2743 2744 For America/Los_Angeles, spring-forward transition times have been 2745 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2746 1950-1966. 2747 2748 For zones using Soviet time on 1919-07-01, transitions to UT-based 2749 time were at 00:00 UT, not at 02:00 local time. The affected 2750 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2751 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2752 2753 Changes to past and future time zone abbreviations 2754 2755 The Factory zone now uses the time zone abbreviation -00 instead 2756 of a long English-language string, as -00 is now the normal way to 2757 represent an undefined time zone. 2758 2759 Several zones in Antarctica and the former Soviet Union, along 2760 with zones intended for ships at sea that cannot use POSIX TZ 2761 strings, now use numeric time zone abbreviations instead of 2762 invented or obsolete alphanumeric abbreviations. The affected 2763 zones are Antarctica/Casey, Antarctica/Davis, 2764 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2765 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2766 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2767 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2768 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2769 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2770 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2771 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2772 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2773 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2774 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2775 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2776 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2777 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2778 was replaced by +05, whereas MSK and MSD were kept as they are not 2779 our invention and are widely used. 2780 2781 Changes to zone names 2782 2783 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2784 (Thanks to David Massoud.) 2785 2786 Changes to code 2787 2788 zic no longer generates binary files containing POSIX TZ-like 2789 strings that disagree with the local time type after the last 2790 explicit transition in the data. This fixes a bug with 2791 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2792 on the reference platform. (Thanks to Alexander Belopolsky for 2793 reporting the bug and suggesting a way forward.) 2794 2795 If the installed localtime and/or posixrules files are symbolic 2796 links, zic now keeps them symbolic links when updating them, for 2797 compatibility with platforms like OpenSUSE where other programs 2798 configure these files as symlinks. 2799 2800 zic now avoids hard linking to symbolic links, avoids some 2801 unnecessary mkdir and stat system calls, and uses shorter file 2802 names internally. 2803 2804 zdump has a new -i option to generate transitions in a 2805 smaller but still human-readable format. This option is 2806 experimental, and the output format may change in future versions. 2807 (Thanks to Jon Skeet for suggesting that an option was needed, 2808 and thanks to Tim Parenti and Chris Rovick for further comments.) 2809 2810 Changes to build procedure 2811 2812 An experimental distribution format is available, in addition 2813 to the traditional format which will continue to be distributed. 2814 The new format is a tarball tzdb-VERSION.tar.lz with signature 2815 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2816 tzdb-VERSION containing the code and data of the traditional 2817 two-tarball format, along with extra data that may be useful. 2818 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2819 for comments about the experimental format.) 2820 2821 The release version number is now more accurate in the usual case 2822 where releases are built from a Git repository. For example, if 2823 23 commits and some working-file changes have been made since 2824 release 2016g, the version number is now something like 2825 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2826 Tagged releases use the same version number format as before, 2827 e.g., '2016g'. To support the more accurate version number, its 2828 specification has moved from a line in the Makefile to a new 2829 source file 'version'. 2830 2831 The experimental distribution contains a file to2050.tzs that 2832 contains what should be the output of 'zdump -i -c 2050' on 2833 primary zones. If this file is available, 'make check' now checks 2834 that zdump generates this output. 2835 2836 'make check_web' now works on Fedora-like distributions. 2837 2838 Changes to documentation and commentary 2839 2840 tzfile.5 now documents the new restriction on POSIX TZ-like 2841 strings that is now implemented by zic. 2842 2843 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2844 (Thanks to Alexander Belopolsky.) 2845 2846 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2847 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2848 description of Java 8 has been brought up to date (thanks to 2849 Stephen Colebourne). Its description of local time on Mars has 2850 been updated to match current practice, and URLs have been updated 2851 and some obsolete ones removed. 2852 2853 2854 Release 2016f - 2016-07-05 16:26:51 +0200 2855 2856 Changes affecting future timestamps 2857 2858 The Egyptian government changed its mind on short notice, and 2859 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2860 (Thanks to Mina Samuel.) 2861 2862 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2863 (Thanks to Stepan Golosunov.) 2864 2865 Changes to past and future timestamps 2866 2867 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2868 abbreviations instead of invented ones. 2869 2870 Changes affecting past timestamps 2871 2872 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2873 (Thanks to Stepan Golosunov.) 2874 2875 2876 Release 2016e - 2016-06-14 08:46:16 -0700 2877 2878 Changes affecting future timestamps 2879 2880 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2881 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2882 For future years, guess April's last Thursday to October's last 2883 Thursday except for Ramadan. 2884 2885 Changes affecting past timestamps 2886 2887 Locations while uninhabited now use '-00', not 'zzz', as a 2888 placeholder time zone abbreviation. This is inspired by Internet 2889 RFC 3339 and is more consistent with numeric time zone 2890 abbreviations already used elsewhere. The change affects several 2891 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2892 1920 and Antarctica/Troll before 2005. 2893 2894 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2895 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2896 2897 Changes to code 2898 2899 zic now outputs a dummy transition at time 2**31 - 1 in zones 2900 whose POSIX-style TZ strings contain a '<'. This mostly works 2901 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2902 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2903 2904 Changes affecting documentation and commentary 2905 2906 tz-link.htm says why governments should give plenty of notice for 2907 time zone or DST changes, and refers to Matt Johnson's blog post. 2908 2909 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2910 2911 2912 Release 2016d - 2016-04-17 22:50:29 -0700 2913 2914 Changes affecting future timestamps 2915 2916 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2917 (Thanks to Alexander Krivenyshev for the heads-up.) 2918 2919 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2920 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2921 2922 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2923 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2924 at 02:00. (Thanks to Stepan Golosunov.) 2925 2926 Changes affecting past timestamps 2927 2928 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2929 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2930 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2931 the same change. (Thanks to Stepan Golosunov.) 2932 2933 Russia and nearby locations had daylight-saving transitions on 2934 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2935 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2936 Golosunov.) 2937 2938 Many corrections to historical time in Kazakhstan from 1991 2939 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2940 invented time zone abbreviations with numeric abbreviations. 2941 2942 Changes to commentary 2943 2944 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2945 2946 2947 Release 2016c - 2016-03-23 00:51:27 -0700 2948 2949 Changes affecting future timestamps 2950 2951 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2952 2953 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2954 Correa for the heads-up, and to Tim Parenti for corrections.) 2955 Guess that future transitions are August's and May's second 2956 Saturdays at 24:00 mainland time. Also, call the period from 2957 2014-09-07 through 2016-05-14 daylight saving time instead of 2958 standard time, as that seems more appropriate now. 2959 2960 Changes affecting past timestamps 2961 2962 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2963 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2964 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2965 (Thanks to Stepan Golosunov.) 2966 2967 Changes to commentary 2968 2969 Several updates and URLs for historical and proposed Russian changes. 2970 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2971 2972 2973 Release 2016b - 2016-03-12 17:30:14 -0800 2974 2975 Compatibility note 2976 2977 Starting with release 2016b, some data entries cause zic implementations 2978 derived from tz releases 2005j through 2015e to issue warnings like 2979 "time zone abbreviation differs from POSIX standard (+03)". 2980 These warnings should not otherwise affect zic's output and can safely be 2981 ignored on today's platforms, as the warnings refer to a restriction in 2982 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2983 warnings is to upgrade to zic derived from tz releases 2015f and later. 2984 2985 Changes affecting future timestamps 2986 2987 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2988 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2989 2016-03-27 at 02:00 local time. They need distinct zones since their 2990 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2991 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2992 and local time. The Astrakhan change is already official; the others have 2993 passed the first reading in the State Duma and are extremely likely. 2994 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2995 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2996 and Stepan Golosunov for followup.) 2997 2998 As a trial of a new system that needs less information to be made up, 2999 the new zones use numeric time zone abbreviations like "+04" 3000 instead of invented abbreviations like "ASTT". 3001 3002 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3003 Steffen Thorsen.) 3004 3005 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3006 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3007 Saturday at 01:00, not March's last Friday at 24:00. 3008 3009 Changes affecting past timestamps 3010 3011 Europe/Chisinau observed DST during 1990, and switched from +04 to 3012 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3013 (Thanks to Stepan Golosunov.) 3014 3015 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3016 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3017 3018 Changes to code 3019 3020 tzselect's diagnostics and checking, and checktab.awk's checking, 3021 have been improved. (Thanks to J William Piggott.) 3022 3023 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3024 3025 tzselect now tests Julian-date TZ settings more accurately. 3026 (Thanks to J William Piggott.) 3027 3028 Changes to commentary 3029 3030 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3031 3032 tzselect again limits its menu comments so that menus fit on a 3033 2480 alphanumeric display. 3034 3035 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3036 3037 In the Theory file, the description of possible time zone abbreviations in 3038 tzdata has been cleaned up, as the old description was unclear and 3039 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3040 3041 3042 Release 2016a - 2016-01-26 23:28:02 -0800 3043 3044 Changes affecting future timestamps 3045 3046 America/Cayman will not observe daylight saving this year after all. 3047 Revert our guess that it would. (Thanks to Matt Johnson.) 3048 3049 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3050 (Thanks to Alexander Krivenyshev.) 3051 3052 Asia/Tehran now has DST predictions for the year 2038 and later, 3053 to be March 21 00:00 to September 21 00:00. This is likely better 3054 than predicting no DST, albeit off by a day every now and then. 3055 3056 Changes affecting past and future timestamps 3057 3058 America/Metlakatla switched from PST all year to AKST/AKDT on 3059 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3060 3061 America/Santa_Isabel has been removed, and replaced with a 3062 backward compatibility link to America/Tijuana. Its contents were 3063 apparently based on a misreading of Mexican legislation. 3064 3065 Changes affecting past timestamps 3066 3067 Asia/Karachi's two transition times in 2002 were off by a minute. 3068 (Thanks to Matt Johnson.) 3069 3070 Changes affecting build procedure 3071 3072 An installer can now combine leap seconds with use of the backzone file, 3073 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3074 The old 'make posix_packrat' rule is now marked as obsolescent. 3075 (Thanks to Ian Abbott for an initial implementation.) 3076 3077 Changes affecting documentation and commentary 3078 3079 A new file LICENSE makes it easier to see that the code and data 3080 are mostly public-domain. (Thanks to James Knight.) The three 3081 non-public-domain files now use the current (3-clause) BSD license 3082 instead of older versions of that license. 3083 3084 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3085 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3086 on editing tz source files (with a mention of Sublime zoneinfo, 3087 thanks to Gilmore Davidson). 3088 3089 The Theory and asia files now mention the 2015 book "The Global 3090 Transformation of Time, 1870-1950", and cite a couple of reviews. 3091 3092 The America/Chicago entry now documents the informal use of US 3093 central time in Fort Pierre, South Dakota. (Thanks to Rick 3094 McDermid, Matt Johnson, and Steve Jones.) 3095 3096 3097 Release 2015g - 2015-10-01 00:39:51 -0700 3098 3099 Changes affecting future timestamps 3100 3101 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3102 (Thanks to Fatih.) 3103 3104 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3105 (Thanks to Alexander Krivenyshev.) 3106 3107 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3108 (Thanks to Ken Rylander.) 3109 3110 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3111 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3112 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3113 3114 Changes affecting past timestamps 3115 3116 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3117 3118 Changes affecting code 3119 3120 localtime no longer mishandles America/Anchorage after 2037. 3121 (Thanks to Bradley White for reporting the bug.) 3122 3123 On hosts with signed 32-bit time_t, localtime no longer mishandles 3124 Pacific/Fiji after 2038-01-16 14:00 UTC. 3125 3126 The localtime module allows the variables 'timezone', 'daylight', 3127 and 'altzone' to be in common storage shared with other modules, 3128 and declares them in case the system <time.h> does not. 3129 (Problems reported by Kees Dekker.) 3130 3131 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3132 This simplifies the code and is consistent with zdump.c. 3133 (Problem reported by Christos Zoulas.) 3134 3135 Changes affecting documentation 3136 3137 The tzfile man page now documents that transition times denote the 3138 starts (not the ends) of the corresponding time periods. 3139 (Ambiguity reported by Bill Seymour.) 3140 3141 3142 Release 2015f - 2015-08-10 18:06:56 -0700 3143 3144 Changes affecting future timestamps 3145 3146 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3147 The abbreviation remains "KST". (Thanks to Robert Elz.) 3148 3149 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3150 and Pablo Camargo.) 3151 3152 Changes affecting past and future timestamps 3153 3154 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3155 (Thanks to Roman Tudos.) 3156 3157 Changes affecting data format and code 3158 3159 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3160 field of a Rule line should now be '-'; the old values 'even', 3161 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3162 Although the implementation has not changed, these features do not 3163 work in the default installation, they are not used in the data, 3164 and they are now considered obsolescent. 3165 3166 zic now checks that two rules don't take effect at the same time. 3167 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3168 simultaneity are now documented. 3169 3170 The two characters '%z' in a zone format now stand for the UT 3171 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3172 five hours and thirty minutes ahead. This better supports time 3173 zone abbreviations conforming to POSIX.1-2001 and later. 3174 3175 Changes affecting installed data files 3176 3177 Comments for America/Halifax and America/Glace_Bay have been improved. 3178 (Thanks to Brian Inglis.) 3179 3180 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3181 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3182 installed data files for Europe/Simferopol and Europe/Tallinn. 3183 It does not affect timestamps. (Thanks to Howard Hinnant.) 3184 3185 Changes affecting code 3186 3187 zdump and zic no longer warn about valid time zone abbreviations 3188 like '-05'. 3189 3190 Some Visual Studio 2013 warnings have been suppressed. 3191 (Thanks to Kees Dekker.) 3192 3193 'date' no longer sets the time of day and its -a, -d, -n and -t 3194 options have been removed. Long obsolescent, the implementation 3195 of these features had porting problems. Builders no longer need 3196 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3197 (Thanks to Kees Dekker for pointing out the problem.) 3198 3199 Changes affecting documentation 3200 3201 The Theory file mentions naming issues earlier, as these seem to be 3202 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3203 3204 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3205 3206 Mention that Herbert Samuel introduced the term "Summer Time". 3207 3208 3209 Release 2015e - 2015-06-13 10:56:02 -0700 3210 3211 Changes affecting future timestamps 3212 3213 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3214 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3215 3216 Assume Cayman Islands will observe DST starting next year, using US rules. 3217 Although it isn't guaranteed, it is the most likely. 3218 3219 Changes affecting data format 3220 3221 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3222 spell the names of land Islands, Cte d'Ivoire, and Runion. 3223 3224 Changes affecting code 3225 3226 When displaying data, tzselect converts it to the current locale's 3227 encoding if the iconv command works. (Problem reported by random832.) 3228 3229 tzselect no longer mishandles Dominica, fixing a bug introduced 3230 in Release 2014f. (Problem reported by Owen Leibman.) 3231 3232 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3233 This fixes a bug introduced in Release 2014f. 3234 (Problem reported by Leonardo Chiquitto.) 3235 3236 3237 Release 2015d - 2015-04-24 08:09:46 -0700 3238 3239 Changes affecting future timestamps 3240 3241 Egypt will not observe DST in 2015 and will consider canceling it 3242 permanently. For now, assume no DST indefinitely. 3243 (Thanks to Ahmed Nazmy and Tim Parenti.) 3244 3245 Changes affecting past timestamps 3246 3247 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3248 1966-07-01. Also, Yukon's time zone history is documented better. 3249 (Thanks to Brian Inglis and Dennis Ferguson.) 3250 3251 Change affecting past and future time zone abbreviations 3252 3253 The abbreviations for Hawaii-Aleutian standard and daylight times 3254 have been changed from HAST/HADT to HST/HDT, as per US Government 3255 Printing Office style. This affects only America/Adak since 1983, 3256 as America/Honolulu was already using the new style. 3257 3258 Changes affecting code 3259 3260 zic has some minor performance improvements. 3261 3262 3263 Release 2015c - 2015-04-11 08:55:55 -0700 3264 3265 Changes affecting future timestamps 3266 3267 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3268 not 00:00 on April's last Friday. 2015's transition will therefore be on 3269 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3270 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3271 3272 Changes affecting past timestamps 3273 3274 The following changes affect some pre-1991 Chile-related timestamps 3275 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3276 3277 The 1910 transition was January 10, not January 1. 3278 3279 The 1918 transition was September 10, not September 1. 3280 3281 The UT -04 time observed from 1932 to 1942 is now considered to 3282 be standard time, not year-round DST. 3283 3284 Santiago observed DST (UT -03) from 1946-07-15 through 3285 1946-08-31, then reverted to standard time, then switched to -05 3286 on 1947-04-01. 3287 3288 Assume transitions before 1968 were at 00:00, since we have no data 3289 saying otherwise. 3290 3291 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3292 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3293 3294 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3295 and omit all transitions on Pacific/Easter from 1942 through 1946 3296 since we have no data suggesting that they existed. 3297 3298 One more zone has been turned into a link, as it differed 3299 from an existing zone only for older timestamps. As usual, 3300 this change affects UT offsets in pre-1970 timestamps only. 3301 The zone's old contents have been moved to the 'backzone' file. 3302 The affected zone is America/Montreal. 3303 3304 Changes affecting commentary 3305 3306 Mention the TZUpdater tool. 3307 3308 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3309 3310 3311 Release 2015b - 2015-03-19 23:28:11 -0700 3312 3313 Changes affecting future timestamps 3314 3315 Mongolia will start observing DST again this year, from the last 3316 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3317 (Thanks to Ganbold Tsagaankhuu.) 3318 3319 Palestine will start DST on March 28, not March 27. Also, 3320 correct the fall 2014 transition from September 26 to October 24. 3321 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3322 3323 Changes affecting past timestamps 3324 3325 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3326 regression. (Thanks to Stuart Bishop for reporting the problem.) 3327 3328 Some more zones have been turned into links, when they differed 3329 from existing zones only for older timestamps. As usual, 3330 these changes affect UT offsets in pre-1970 timestamps only. 3331 Their old contents have been moved to the 'backzone' file. 3332 The affected zones are: America/Antigua, America/Cayman, 3333 Pacific/Midway, and Pacific/Saipan. 3334 3335 Changes affecting time zone abbreviations 3336 3337 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3338 (Thanks to Hank W.) 3339 3340 Changes affecting code 3341 3342 Fix integer overflow bug in reference 'mktime' implementation. 3343 (Problem reported by Jrg Richter.) 3344 3345 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3346 to be used in the same executable as standard-library time_t functions. 3347 (Problems reported by Bradley White.) 3348 3349 Changes affecting commentary 3350 3351 Cite the recent Mexican decree changing Quintana Roo's time zone. 3352 (Thanks to Carlos Ral Perasso.) 3353 3354 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3355 3356 Update info about Mars time. 3357 3358 3359 Release 2015a - 2015-01-29 22:35:20 -0800 3360 3361 Changes affecting future timestamps 3362 3363 The Mexican state of Quintana Roo, represented by America/Cancun, 3364 will shift from Central Time with DST to Eastern Time without DST 3365 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3366 3367 Chile will not change clocks in April or thereafter; its new standard time 3368 will be its old daylight saving time. This affects America/Santiago, 3369 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3370 3371 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3372 (Thanks to Tim Parenti.) 3373 3374 Changes affecting past timestamps 3375 3376 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3377 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3378 Shanks about time in Iceland between 1837 and 1908. 3379 3380 Some more zones have been turned into links, when they differed 3381 from existing zones only for older timestamps. As usual, 3382 these changes affect UT offsets in pre-1970 timestamps only. 3383 Their old contents have been moved to the 'backzone' file. 3384 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3385 and Asia/Muscat. 3386 3387 Changes affecting code 3388 3389 tzalloc now scrubs time zone abbreviations compatibly with the way 3390 that tzset always has, by replacing invalid bytes with '_' and by 3391 shortening too-long abbreviations. 3392 3393 tzselect ports to POSIX awk implementations, no longer mishandles 3394 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3395 settings to the user. (Thanks to Stefan Kuhn.) 3396 3397 Changes affecting build procedure 3398 3399 'make check' now checks for links to links in the data. 3400 One such link (for Africa/Asmera) has been fixed. 3401 (Thanks to Stephen Colebourne for pointing out the problem.) 3402 3403 Changes affecting commentary 3404 3405 The leapseconds file commentary now mentions the expiration date. 3406 (Problem reported by Martin Burnicki.) 3407 3408 Update Mexican Library of Congress URL. 3409 3410 3411 Release 2014j - 2014-11-10 17:37:11 -0800 3412 3413 Changes affecting current and future timestamps 3414 3415 Turks & Caicos' switch from US eastern time to UT -04 year-round 3416 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3417 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3418 3419 Changes affecting past timestamps 3420 3421 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3422 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3423 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3424 longer guess that Pyongyang mimicked Seoul time after World War II, 3425 as this is politically implausible. 3426 3427 Some more zones have been turned into links, when they differed 3428 from existing zones only for older timestamps. As usual, 3429 these changes affect UT offsets in pre-1970 timestamps only. 3430 Their old contents have been moved to the 'backzone' file. 3431 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3432 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3433 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3434 Indian/Mayotte. 3435 3436 Changes affecting commentary 3437 3438 The commentary is less enthusiastic about Shanks as a source, 3439 and is more careful to distinguish UT from UTC. 3440 3441 3442 Release 2014i - 2014-10-21 22:04:57 -0700 3443 3444 Changes affecting future timestamps 3445 3446 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3447 (Thanks to Ken Rylander for the heads-up.) Guess that future 3448 years will use a similar pattern. 3449 3450 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3451 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3452 (Thanks to Kiley Walbom for the heads-up.) 3453 3454 Changes affecting time zone abbreviations 3455 3456 Since Belarus is not changing its clocks even though Moscow is, 3457 the time zone abbreviation in Europe/Minsk is changing from FET 3458 to its more traditional value MSK on 2014-10-26 at 01:00. 3459 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3460 3461 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3462 Indochina, to distinguish it better from ICT (+07). 3463 3464 Changes affecting past timestamps 3465 3466 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3467 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3468 authoritative book). Asia/Ho_Chi_Minh has been added to 3469 zone1970.tab, to give tzselect users in Vietnam two choices, 3470 since north and south Vietnam disagreed after our 1970 cutoff. 3471 3472 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3473 they differed from existing zones only for older timestamps. As 3474 usual, these changes affect pre-1970 timestamps only. Their old 3475 contents have been moved to the 'backzone' file. 3476 3477 Changes affecting code 3478 3479 The time-related library functions now set errno on failure, and 3480 some crashes in the new tzalloc-related library functions have 3481 been fixed. (Thanks to Christos Zoulas for reporting most of 3482 these problems and for suggesting fixes.) 3483 3484 If USG_COMPAT is defined and the requested timestamp is standard time, 3485 the tz library's localtime and mktime functions now set the extern 3486 variable timezone to a value appropriate for that timestamp; and 3487 similarly for ALTZONE, daylight saving time, and the altzone variable. 3488 This change is a companion to the tzname change in 2014h, and is 3489 designed to make timezone and altzone more compatible with tzname. 3490 3491 The tz library's functions now set errno to EOVERFLOW if they fail 3492 because the result cannot be represented. ctime and ctime_r now 3493 return NULL and set errno when a timestamp is out of range, rather 3494 than having undefined behavior. 3495 3496 Some bugs associated with the new 2014g functions have been fixed. 3497 This includes a bug that largely incapacitated the new functions 3498 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3499 It also includes some uses of uninitialized variables after tzalloc. 3500 The new code uses the standard type 'ssize_t', which the Makefile 3501 now gives porting advice about. 3502 3503 Changes affecting commentary 3504 3505 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3506 3507 3508 Release 2014h - 2014-09-25 18:59:03 -0700 3509 3510 Changes affecting past timestamps 3511 3512 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3513 3514 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3515 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3516 3517 Some more zones have been turned into links, when they differed 3518 from existing zones only for older timestamps. As usual, 3519 these changes affect UT offsets in pre-1970 timestamps only. 3520 Their old contents have been moved to the 'backzone' file. 3521 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3522 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3523 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3524 3525 Changes affecting code 3526 3527 zdump -V and -v now output gmtoff= values on all platforms, 3528 not merely on platforms defining TM_GMTOFF. 3529 3530 The tz library's localtime and mktime functions now set tzname to a value 3531 appropriate for the requested timestamp, and zdump now uses this 3532 on platforms not defining TM_ZONE, fixing a 2014g regression. 3533 (Thanks to Tim Parenti for reporting the problem.) 3534 3535 The tz library no longer sets tzname if localtime or mktime fails. 3536 3537 zdump -c no longer mishandles transitions near year boundaries. 3538 (Thanks to Tim Parenti for reporting the problem.) 3539 3540 An access to uninitialized data has been fixed. 3541 (Thanks to Jrg Richter for reporting the problem.) 3542 3543 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3544 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3545 and two threads race to initialize data used by gmtime-like functions. 3546 (Thanks to Andy Heninger for reporting the problems.) 3547 3548 Changes affecting build procedure 3549 3550 'make check' now checks better for properly sorted data. 3551 3552 Changes affecting documentation and commentary 3553 3554 zdump's gmtoff=N output is now documented, and its isdst=D output 3555 is now documented to possibly output D values other than 0 or 1. 3556 3557 zdump -c's treatment of years is now documented to use the 3558 Gregorian calendar and Universal Time without leap seconds, 3559 and its behavior at cutoff boundaries is now documented better. 3560 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3561 3562 Programs are now documented to use the proleptic Gregorian calendar. 3563 (Thanks to Alan Barrett for the suggestion.) 3564 3565 Fractional-second GMT offsets have been documented for civil time 3566 in 19th-century Chennai, Jakarta, and New York. 3567 3568 3569 Release 2014g - 2014-08-28 12:31:23 -0700 3570 3571 Changes affecting future timestamps 3572 3573 Turks & Caicos is switching from US eastern time to UT -04 3574 year-round, modeled as a switch on 2014-11-02 at 02:00. 3575 [As noted in 2014j, this switch was later delayed.] 3576 3577 Changes affecting past timestamps 3578 3579 Time in Russia or the USSR before 1926 or so has been corrected by 3580 a few seconds in the following zones: Asia/Irkutsk, 3581 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3582 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3583 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3584 Vladimir Karpinsky.) 3585 3586 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3587 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3588 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3589 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3590 (Thanks to Stephen Colebourne for pointing to the decree.) 3591 3592 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3593 3594 A new file 'backzone' contains data which may appeal to 3595 connoisseurs of old timestamps, although it is out of scope for 3596 the tz database, is often poorly sourced, and contains some data 3597 that is known to be incorrect. The new file is not recommended 3598 for ordinary use and its entries are not installed by default. 3599 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3600 Isle of Man entries.) 3601 3602 Some more zones have been turned into links, when they differed 3603 from existing zones only for older timestamps. As usual, 3604 these changes affect UT offsets in pre-1970 timestamps only. 3605 Their old contents have been moved to the 'backzone' file. 3606 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3607 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3608 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3609 3610 Changes affecting code 3611 3612 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3613 supplies functions for creating and using objects that represent 3614 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3615 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3616 time2posix_z. They are intended for performance: for example, 3617 localtime_rz (unlike localtime_r) is trivially thread-safe without 3618 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3619 functions, and to Alan Barrett and Jonathan Lennox for helping to 3620 debug the change.) 3621 3622 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3623 This lets zdump use tz features even if the system library lacks them. 3624 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3625 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3626 3627 zdump now uses localtime_rz if available, as it's significantly faster, 3628 and it can help zdump better diagnose invalid timezone names. 3629 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3630 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3631 not available, zdump now uses localtime_r and tzset if available, 3632 as this is a bit cleaner and faster than plain localtime. Compile 3633 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3634 lacks these two functions. 3635 3636 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3637 Although not needed for tz's own applications, which are single-threaded, 3638 this supports POSIX better if the tz library is used in multithreaded apps. 3639 3640 Some crashes have been fixed when zdump or the tz library is given 3641 invalid or outlandish input. 3642 3643 The tz library no longer mishandles leap seconds on platforms with 3644 unsigned time_t in timezones that lack ordinary transitions after 1970. 3645 3646 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3647 already defined, to make it easier to configure on common platforms. 3648 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3649 3650 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3651 assumes that reading uninitialized memory yields garbage values 3652 but does not cause other problems such as traps. 3653 3654 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3655 more likely to guess right for ambiguous timestamps near 3656 transitions where tm_isdst does not change. 3657 3658 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3659 strftime_l for compatibility with recent versions of POSIX. 3660 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3661 to 1 on recent POSIX versions, and to 0 otherwise. 3662 3663 tzselect -c now uses a hybrid distance measure that works better 3664 in Africa. (Thanks to Alan Barrett for noting the problem.) 3665 3666 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3667 or when time_tz is defined. 3668 3669 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3670 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3671 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3672 This affects GNU/Linux and similar systems. 3673 3674 For easier maintenance later, some C code has been simplified, 3675 some lint has been removed, and the code has been tweaked so that 3676 plain 'make' is more likely to work. 3677 3678 The C type 'bool' is now used for boolean values, instead of 'int'. 3679 3680 The long-obsolete LOCALE_HOME code has been removed. 3681 3682 The long-obsolete 'gtime' function has been removed. 3683 3684 Changes affecting build procedure 3685 3686 'zdump' no longer links in ialloc.o, as it's not needed. 3687 3688 'make check_time_t_alternatives' no longer assumes GNU diff. 3689 3690 Changes affecting distribution tarballs 3691 3692 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3693 the tzdata tarball instead of the tzcode tarball, since they help 3694 maintain the data. The NEWS and Theory files are now also 3695 distributed in the tzdata tarball, as they're relevant for data. 3696 (Thanks to Alan Barrett for pointing this out.) Also, the 3697 leapseconds.awk file is no longer distributed in the tzcode 3698 tarball, since it belongs in the tzdata tarball (where 2014f 3699 inadvertently also distributed it). 3700 3701 Changes affecting documentation and commentary 3702 3703 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3704 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3705 for debugging it.) 3706 3707 The man pages have been updated to use function prototypes, 3708 to document thread-safe variants like localtime_r, and to document 3709 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3710 mktime_z. 3711 3712 The fields in Link lines have been renamed to be more descriptive 3713 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3714 and LINK-TO has become LINK-NAME. 3715 3716 tz-link.htm mentions the IETF's tzdist working group; Windows 3717 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3718 3719 Some broken URLs have been fixed in the commentary. (Thanks to 3720 Lester Caine.) 3721 3722 Commentary about Philippines DST has been updated, and commentary 3723 on pre-1970 time in India has been added. 3724 3725 3726 Release 2014f - 2014-08-05 17:42:36 -0700 3727 3728 Changes affecting future timestamps 3729 3730 Russia will subtract an hour from most of its time zones on 2014-10-26 3731 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3732 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3733 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3734 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3735 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3736 (Europe/Samara) are not changing their clocks. The changed zones are 3737 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3738 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3739 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3740 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3741 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3742 but not its UTC offset. Two zones are added: Asia/Chita (split 3743 from Asia/Yakutsk, and also with two hours subtracted) and 3744 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3745 subtracted). (Thanks to Tim Parenti for much of the above.) 3746 3747 Changes affecting time zone abbreviations 3748 3749 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3750 and similarly for the other Australian zones. That is, for eastern 3751 standard and daylight saving time the abbreviations are AEST and AEDT 3752 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3753 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3754 This change does not affect UT offsets, only time zone abbreviations. 3755 (Thanks to Rich Tibbett and many others.) 3756 3757 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3758 effective 2014-10-26 at 02:00 local time. 3759 3760 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3761 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3762 3763 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3764 Similarly, prefer EET/EEST for eastern European time in Russia. 3765 3766 Change time zone abbreviations in (western) Samoa to use "ST" and 3767 "DT" suffixes, as this is more likely to match common practice. 3768 Prefix "W" to (western) Samoa time when its standard-time offset 3769 disagrees with that of American Samoa. 3770 3771 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3772 3773 Time zone abbreviations have been updated for Japan's two time 3774 zones used 1896-1937. JWST now stands for Western Standard 3775 Time, and JCST for Central Standard Time (formerly this was CJT). 3776 These abbreviations are now used for time in Korea, Taiwan, 3777 and Sakhalin while controlled by Japan. 3778 3779 Changes affecting past timestamps 3780 3781 China's five zones have been simplified to two, since the post-1970 3782 differences in the other three seem to have been imaginary. The 3783 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3784 removed; backwards-compatibility links still work, albeit with 3785 different behaviors for timestamps before May 1980. Asia/Urumqi's 3786 1980 transition to UT +08 has been removed, so that it is now at 3787 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3788 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3789 3790 Some zones have been turned into links, when they differed from existing 3791 zones only for older UT offsets where data entries were likely invented. 3792 These changes affect UT offsets in pre-1970 timestamps only. This is 3793 similar to the change in release 2013e, except this time for western 3794 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3795 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3796 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3797 Atlantic/St_Helena. This also affects the backwards-compatibility 3798 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3799 Tim Parenti, and David Patte for reporting problems in earlier 3800 versions of this change.) 3801 3802 Asia/Shanghai's pre-standard-time UT offset has been changed from 3803 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3804 transition to standard time has been changed from 1928 to 1901. 3805 3806 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3807 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3808 In 1946 it observed DST from 05-15 through 09-30; in 1947 3809 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3810 (Thanks to Yu-Cheng Chuang.) 3811 3812 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3813 3814 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3815 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3816 3817 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3818 period from 1911 to 1950. 3819 3820 Pacific/Chatham has been changed to New Zealand standard time plus 3821 45 minutes for the period before 1957, reflecting a 1956 remark in 3822 the New Zealand parliament. 3823 3824 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3825 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3826 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3827 not 04-06 at 02:00; and there was no DST in 1920. 3828 3829 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3830 3831 Time in Russia before 1927 or so has been corrected by a few seconds in 3832 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3833 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3834 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3835 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3836 3837 Changes affecting data format 3838 3839 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3840 The new file's extended format allows multiple country codes per zone. 3841 The older file is still installed but is deprecated; its format is 3842 not changing and it will still be distributed for a while, but new 3843 applications should use the new file. 3844 3845 The new file format simplifies maintenance of obscure locations. 3846 To test this, it adds coverage for the Crozet Islands and the 3847 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3848 3849 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3850 It is still ASCII now, but commentary about the switch has been added. 3851 The new file 'zone1970.tab' already uses UTF-8. 3852 3853 Changes affecting code 3854 3855 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3856 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3857 3858 'zic' no longer mishandles input when ignoring case in locales that 3859 are not compatible with English, e.g., unibyte Turkish locales when 3860 compiled with HAVE_GETTEXT. 3861 3862 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3863 they no longer use ASCII '-' as if it were a dash. 3864 3865 'zic' now rejects output file names that contain '.' or '..' components. 3866 (Thanks to Tim Parenti for reporting the problem.) 3867 3868 'zic -v' now warns about output file names that do not follow 3869 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3870 David Olson for starting the ball rolling on this.) 3871 3872 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3873 3874 Changes affecting build procedure 3875 3876 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3877 (Thanks to John Cochran.) 3878 3879 Changes affecting documentation and commentary 3880 3881 The 'Theory' file documents legacy names, the longstanding 3882 exceptions to the POSIX-inspired file name rules. 3883 3884 The 'zic' documentation clarifies the role of time types when 3885 interpreting dates. (Thanks to Arthur David Olson.) 3886 3887 Documentation and commentary now prefer UTF-8 to US-ASCII, 3888 allowing the use of proper accents in foreign words and names. 3889 Code and data have not changed because of this. (Thanks to 3890 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3891 this.) 3892 3893 Non-HTML documentation and commentary now use plain-text URLs instead of 3894 HTML insertions, and are more consistent about bracketing URLs when they 3895 are not already surrounded by white space. (Thanks to suggestions by 3896 Steffen Nurpmeso.) 3897 3898 There is new commentary about Xujiahui Observatory, the five time-zone 3899 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3900 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3901 warlord Jin Shuren in the data. 3902 3903 Commentary about the coverage of each Russian zone has been standardized. 3904 (Thanks to Tim Parenti.) 3905 3906 There is new commentary about contemporary timekeeping in Ethiopia. 3907 3908 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3909 3910 There is new commentary about time in Poland in 1919. 3911 3912 Proper credit has been given to DST inventor George Vernon Hudson. 3913 3914 Commentary about time in Metlakatla, AK and Resolute, NU has been 3915 improved, with a new source for the former. 3916 3917 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3918 is uninhabited. 3919 3920 Commentary about permanent Antarctic bases has been updated. 3921 3922 Several typos have been corrected. (Thanks to Tim Parenti for 3923 contributing some of these fixes.) 3924 3925 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3926 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3927 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3928 (Thanks to a heads-up from Dirkjan Ochtman.) 3929 3930 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3931 have been removed. These obsolescent US Naval Observatory entries were no 3932 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3933 3934 3935 Release 2014e - 2014-06-12 21:53:52 -0700 3936 3937 Changes affecting near-future timestamps 3938 3939 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3940 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3941 switch to standard time at 24:00 the last Thursday before Ramadan, and 3942 back to DST at 00:00 the first Friday after Ramadan. 3943 3944 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3945 to Milamber Space Network.) Guess that from 2015 on Morocco will 3946 temporarily switch to standard time at 03:00 the last Saturday before 3947 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3948 3949 Changes affecting past timestamps 3950 3951 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3952 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3953 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3954 in 1991. (Thanks to Hank W. for reporting the problems.) 3955 3956 Changes affecting commentary 3957 3958 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3959 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3960 removes stale pointers to World Time Explorer and WORLDTIME. 3961 3962 3963 Release 2014d - 2014-05-27 21:34:40 -0700 3964 3965 Changes affecting code 3966 3967 zic no longer generates files containing timestamps before the Big Bang. 3968 This works around GNOME glib bug 878 3969 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3970 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3971 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3972 3973 Changes affecting documentation 3974 3975 tz-link.htm now mentions GNOME. 3976 3977 3978 Release 2014c - 2014-05-13 07:44:13 -0700 3979 3980 Changes affecting near-future timestamps 3981 3982 Egypt observes DST starting 2014-05-15 at 24:00. 3983 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3984 Details have not been announced, except that DST will not be observed 3985 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3986 Morocco, and that Egypt's future spring and fall transitions will be the 3987 same as 2010 when it last observed DST, namely April's last Friday at 3988 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3989 that Ramadan transitions will be at 00:00 standard time. 3990 3991 Changes affecting code 3992 3993 zic now generates transitions for minimum time values, eliminating guesswork 3994 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3995 3996 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3997 3998 Changes affecting commentary and documentation 3999 4000 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4001 4002 4003 Release 2014b - 2014-03-24 21:28:50 -0700 4004 4005 Changes affecting near-future timestamps 4006 4007 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4008 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4009 4010 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4011 Bengt-Inge Larsson.) This is currently an approximation; a better version 4012 will require the zic and localtime fixes mentioned below, and the plan is 4013 to wait for a while until at least the zic fixes propagate. 4014 4015 Changes affecting code 4016 4017 'zic' and 'localtime' no longer reject locations needing four transitions 4018 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4019 Also, 'zic' avoids some unlikely failures due to integer overflow. 4020 4021 Changes affecting build procedure 4022 4023 'make check' now detects Rule lines defined but never used. 4024 The NZAQ rules, an instance of this problem, have been removed. 4025 4026 Changes affecting commentary and documentation 4027 4028 Fix Tuesday/Thursday typo in description of time in Israel. 4029 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4030 4031 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4032 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4033 library supports them. 4034 4035 Add comments about Johnston Island time in the 1960s. 4036 (Thanks to Lyle McElhaney.) 4037 4038 Morocco's 2014 DST start will be as predicted. 4039 (Thanks to Sebastien Willemijns.) 4040 4041 4042 Release 2014a - 2014-03-07 23:30:29 -0800 4043 4044 Changes affecting near-future timestamps 4045 4046 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4047 the heads-up, and to Tim Parenti for simplifying the update.) 4048 4049 Changes affecting past timestamps 4050 4051 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4052 (Thanks to Steffen Thorsen.) 4053 4054 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4055 (not 1992-01-01), and observed DST during the entire next winter. 4056 (Thanks to Vladimir in Moscow via Alois Treindl.) 4057 4058 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4059 (Thanks to Avigdor Finkelstein.) 4060 4061 Changes affecting code 4062 4063 A uninitialized-storage bug in 'localtime' has been fixed. 4064 (Thanks to Logan Chien.) 4065 4066 Changes affecting the build procedure 4067 4068 The settings for 'make check_web' now default to Ubuntu 13.10. 4069 4070 Changes affecting commentary and documentation 4071 4072 The boundary of the US Pacific time zone is given more accurately. 4073 (Thanks to Alan Mintz.) 4074 4075 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 4076 4077 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 4078 4079 Better descriptions of countries with same time zone history as 4080 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4081 4082 Several changes affect tz-link.htm, the main web page. 4083 4084 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4085 David Braverman). 4086 4087 Mention xCal (Internet RFC 6321) and jCal. 4088 4089 Microsoft has some support for tz database names. 4090 4091 CLDR data formats include both XML and JSON. 4092 4093 Mention Maggiolo's map of solar vs standard time. 4094 (Thanks to Arthur David Olson.) 4095 4096 Mention TZ4Net. (Thanks to Matt Johnson.) 4097 4098 Mention the timezone-olson Haskell package. 4099 4100 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 4101 4102 Remove moribund links to daylight-savings-time.info and to 4103 Simple Timer + Clocks. 4104 4105 Update two links. (Thanks to Oscar van Vlijmen.) 4106 4107 Fix some formatting glitches, e.g., remove random newlines from 4108 abbr elements' title attributes. 4109 4110 4111 Release 2013i - 2013-12-17 07:25:23 -0800 4112 4113 Changes affecting near-future timestamps: 4114 4115 Jordan switches back to standard time at 00:00 on December 20, 2013. 4116 The 2006-2011 transition schedule is planned to resume in 2014. 4117 (Thanks to Steffen Thorsen.) 4118 4119 Changes affecting past timestamps: 4120 4121 In 2004, Cuba began DST on March 28, not April 4. 4122 (Thanks to Steffen Thorsen.) 4123 4124 Changes affecting code 4125 4126 The compile-time flag NOSOLAR has been removed, as nowadays the 4127 benefit of slightly shrinking runtime table size is outweighed by the 4128 cost of disallowing potential future updates that exceed old limits. 4129 4130 Changes affecting documentation and commentary 4131 4132 The files solar87, solar88, and solar89 are no longer distributed. 4133 They were a negative experiment - that is, a demonstration that 4134 tz data can represent solar time only with some difficulty and error. 4135 Their presence in the distribution caused confusion, as Riyadh 4136 civil time was generally not solar time in those years. 4137 4138 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4139 4140 4141 Release 2013h - 2013-10-25 15:32:32 -0700 4142 4143 Changes affecting current and future timestamps: 4144 4145 Libya has switched its UT offset back to +02 without DST, instead 4146 of +01 with DST. (Thanks to Even Scharning.) 4147 4148 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4149 (Thanks to Gwillim Law.) 4150 4151 Changes affecting future timestamps: 4152 4153 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4154 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4155 (Thanks to Steffen Thorsen.) 4156 4157 Add entries for DST transitions in Morocco in the year 2038. 4158 This avoids some year-2038 glitches introduced in 2013g. 4159 (Thanks to Yoshito Umaoka for reporting the problem.) 4160 4161 Changes affecting API 4162 4163 The 'tzselect' command no longer requires the 'select' command, 4164 and should now work with /bin/sh on more platforms. It also works 4165 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4166 Patrick 'P. J.' McDermott and Alan Barrett.) 4167 4168 Changes affecting code 4169 4170 Fix localtime overflow bugs with 32-bit unsigned time_t. 4171 4172 zdump no longer assumes sscanf returns maximal values on overflow. 4173 4174 Changes affecting the build procedure 4175 4176 The builder can specify which programs to use, if any, instead of 4177 'ar' and 'ranlib', and libtz.a is now built locally before being 4178 installed. (Thanks to Michael Forney.) 4179 4180 A dependency typo in the 'zdump' rule has been fixed. 4181 (Thanks to Andrew Paprocki.) 4182 4183 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4184 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4185 4186 'make clean' no longer removes 'leapseconds', since it's 4187 host-independent and is part of the distribution. 4188 4189 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4190 4191 Changes affecting documentation and commentary 4192 4193 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4194 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4195 4196 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4197 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4198 longer maintained) and for old advisories. SOFA now does C. 4199 4200 Release 2013g - 2013-09-30 21:08:26 -0700 4201 4202 Changes affecting current and near-future timestamps 4203 4204 Morocco now observes DST from the last Sunday in March to the last 4205 Sunday in October, not April to September respectively. (Thanks 4206 to Steffen Thorsen.) 4207 4208 Changes affecting 'zic' 4209 4210 'zic' now runs on platforms that lack both hard links and symlinks. 4211 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4212 Also, fix some bugs on platforms that lack hard links but have symlinks. 4213 4214 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4215 to predict the far future, fixing a bug introduced in 2013e. 4216 4217 Changes affecting the build procedure 4218 4219 The 'leapseconds' file is again put into the tzdata tarball. 4220 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4221 Matt Burgess and Ian Abbott.) The timestamps of these and other 4222 dependent files in tarballs are adjusted more consistently. 4223 4224 Changes affecting documentation and commentary 4225 4226 The README file is now part of the data tarball as well as the code. 4227 It now states that files are public domain unless otherwise specified. 4228 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4229 Its details about the 1989 release moved to a place of honor near 4230 the end of NEWS. 4231 4232 4233 Release 2013f - 2013-09-24 23:37:36 -0700 4234 4235 Changes affecting near-future timestamps 4236 4237 Tocantins will very likely not observe DST starting this spring. 4238 (Thanks to Steffen Thorsen.) 4239 4240 Jordan will likely stay at UT +03 indefinitely, and will not fall 4241 back this fall. 4242 4243 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4244 4245 Changes affecting API 4246 4247 The types of the global variables 'timezone' and 'altzone' (if present) 4248 have been changed back to 'long'. This is required for 'timezone' 4249 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4250 These variables were originally 'long' in the tz code, but were 4251 mistakenly changed to 'time_t' in 1987; nobody reported the 4252 incompatibility until now. The difference matters on x32, where 4253 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4254 4255 Changes affecting the build procedure 4256 4257 Avoid long strings in leapseconds.awk to work around a mawk bug. 4258 (Thanks to Cyril Baurand.) 4259 4260 Changes affecting documentation and commentary 4261 4262 New file 'NEWS' that contains release notes like this one. 4263 4264 Paraguay's law does not specify DST transition time; 00:00 is customary. 4265 (Thanks to Waldemar Villamayor-Venialbo.) 4266 4267 Minor capitalization fixes. 4268 4269 Changes affecting version-control only 4270 4271 The experimental GitHub repository now contains annotated and 4272 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4273 Releases are tagged starting with 2012e; earlier releases were 4274 done differently, and tags would either not have a simple name or 4275 not exactly match what was released. 4276 4277 'make set-timestamps' is now simpler and a bit more portable. 4278 4279 4280 Release 2013e - 2013-09-19 23:50:04 -0700 4281 4282 Changes affecting near-future timestamps 4283 4284 This year Fiji will start DST on October 27, not October 20. 4285 (Thanks to David Wheeler for the heads-up.) For now, guess that 4286 Fiji will continue to spring forward the Sunday before the fourth 4287 Monday in October. 4288 4289 Changes affecting current and future time zone abbreviations 4290 4291 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4292 time zone abbreviations since 1932. (Thanks to George Ziegler, 4293 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4294 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4295 Asia/Makassar, and Asia/Pontianak. 4296 4297 Use ART (UT -03, standard time), rather than WARST (also -03, but 4298 daylight saving time) for San Luis, Argentina since 2009. 4299 4300 Changes affecting Godthb timestamps after 2037 if version mismatch 4301 4302 Allow POSIX-like TZ strings where the transition time's hour can 4303 range from -167 through 167, instead of the POSIX-required 0 4304 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4305 new Fiji rules. This is a more compact way to represent 4306 far-future timestamps for America/Godthab, America/Santiago, 4307 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4308 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4309 this change. (Derived from a suggestion by Arthur David Olson.) 4310 4311 Allow POSIX-like TZ strings where daylight saving time is in 4312 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4313 Argentina Summer Time all year. This supports a more compact way 4314 to represent the 2013d data for America/Argentina/San_Luis. 4315 Because of the change for San Luis noted above this change does not 4316 affect the current data. (Thanks to Andrew Main (Zefram) for 4317 suggestions that improved this change.) 4318 4319 Where these two TZ changes take effect, there is a minor extension 4320 to the tz file format in that it allows new values for the 4321 embedded TZ-format string, and the tz file format version number 4322 has therefore been increased from 2 to 3 as a precaution. 4323 Version-2-based client code should continue to work as before for 4324 all timestamps before 2038. Existing version-2-based client code 4325 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4326 files, and typically works in practice even for timestamps after 4327 2037; the only known exception is America/Godthab. 4328 4329 Changes affecting timestamps before 1970 4330 4331 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4332 some errors before 1947. 4333 4334 Some zones have been turned into links, when they differ from existing 4335 zones only in older data entries that were likely invented or that 4336 differ only in LMT or transitions from LMT. These changes affect 4337 only timestamps before 1943. The affected zones are: 4338 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4339 America/Grenada, America/Guadeloupe, America/Marigot, 4340 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4341 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4342 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4343 confirming that the old Europe/Vaduz zone was wrong and the new 4344 link is better for WWII-era times.) 4345 4346 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4347 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4348 from 1890 to 1912. 4349 4350 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4351 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4352 to Alois Treindl.) 4353 4354 Change the date of the circa-1850 Zurich transition from 1849-09-12 4355 to 1853-07-16, overriding Shanks with data from Messerli about 4356 postal and telegraph time in Switzerland. 4357 4358 Changes affecting time zone abbreviations before 1970 4359 4360 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4361 as Jakarta was called Batavia back then. 4362 4363 Changes affecting API 4364 4365 The 'zic' command now outputs a dummy transition when far-future 4366 data can't be summarized using a TZ string, and uses a 402-year 4367 window rather than a 400-year window. For the current data, this 4368 affects only the Asia/Tehran file. It does not affect any of the 4369 timestamps that this file represents, so zdump outputs the same 4370 information as before. (Thanks to Andrew Main (Zefram).) 4371 4372 The 'date' command has a new '-r' option, which lets you specify 4373 the integer time to display, a la FreeBSD. 4374 4375 The 'tzselect' command has two new options '-c' and '-n', which lets you 4376 select a zone based on latitude and longitude. 4377 4378 The 'zic' command's '-v' option now warns about constructs that 4379 require the new version-3 binary file format. (Thanks to Arthur 4380 David Olson for the suggestion.) 4381 4382 Support for floating-point time_t has been removed. 4383 It was always dicey, and POSIX no longer requires it. 4384 (Thanks to Eric Blake for suggesting to the POSIX committee to 4385 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4386 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4387 bugs and elucidating some of the corners of the old floating-point 4388 implementation.) 4389 4390 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4391 changed back to the old practice of using 'long' to represent UT 4392 offsets. This had been inadvertently and mistakenly changed to 4393 'int_fast32_t'. (Thanks to Christos Zoulas.) 4394 4395 The code avoids undefined behavior on integer overflow in some 4396 more places, including gmtime, localtime, mktime and zdump. 4397 4398 Changes affecting the zdump utility 4399 4400 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4401 "UTC" does not make sense for timestamps that predate the introduction 4402 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4403 for clarifying UT vs UTC.) 4404 4405 Data changes affecting behavior of tzselect and similar programs 4406 4407 Country code BQ is now called the more common name "Caribbean Netherlands" 4408 rather than the more official "Bonaire, St Eustatius & Saba". 4409 4410 Remove from zone.tab the names America/Montreal, America/Shiprock, 4411 and Antarctica/South_Pole, as they are equivalent to existing 4412 same-country-code zones for post-1970 timestamps. The data entries for 4413 these names are unchanged, so the names continue to work as before. 4414 4415 Changes affecting code internals 4416 4417 zic -c now runs way faster on 64-bit hosts when given large numbers. 4418 4419 zic now uses vfprintf to avoid allocating and freeing some memory. 4420 4421 tzselect now computes the list of continents from the data, 4422 rather than have it hard-coded. 4423 4424 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4425 4426 Changes affecting the build procedure 4427 4428 The 'leapseconds' file is now generated automatically from a 4429 new file 'leap-seconds.list', which is a copy of 4430 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4431 A new source file 'leapseconds.awk' implements this. 4432 The goal is simplification of the future maintenance of 'leapseconds'. 4433 4434 When building the 'posix' or 'right' subdirectories, if the 4435 subdirectory would be a copy of the default subdirectory, it is 4436 now made a symbolic link if that is supported. This saves about 4437 2 MB of file system space. 4438 4439 The links America/Shiprock and Antarctica/South_Pole have been 4440 moved to the 'backward' file. This affects only nondefault builds 4441 that omit 'backward'. 4442 4443 Changes affecting version-control only 4444 4445 .gitignore now ignores 'date'. 4446 4447 Changes affecting documentation and commentary 4448 4449 Changes to the 'tzfile' man page 4450 4451 It now mentions that the binary file format may be extended in 4452 future versions by appending data. 4453 4454 It now refers to the 'zdump' and 'zic' man pages. 4455 4456 Changes to the 'zic' man page 4457 4458 It lists conditions that elicit a warning with '-v'. 4459 4460 It says that the behavior is unspecified when duplicate names 4461 are given, or if the source of one link is the target of another. 4462 4463 Its examples are updated to match the latest data. 4464 4465 The definition of white space has been clarified slightly. 4466 (Thanks to Michael Deckers.) 4467 4468 Changes to the 'Theory' file 4469 4470 There is a new section about the accuracy of the tz database, 4471 describing the many ways that errors can creep in, and 4472 explaining why so many of the pre-1970 timestamps are wrong or 4473 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4474 Wollman for discussions that contributed to this). 4475 4476 The 'Theory' file describes LMT better (this follows a 4477 suggestion by Guy Harris). 4478 4479 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4480 4481 It's mentioned that excluding 'backward' should not affect the 4482 other data, and it suggests at least one zone.tab name per 4483 inhabited country (thanks to Stephen Colebourne). 4484 4485 Some longstanding restrictions on names are documented, e.g., 4486 'America/New_York' precludes 'America/New_York/Bronx'. 4487 4488 It gives more reasons for the 1970 cutoff. 4489 4490 It now mentions which time_t variants are supported, such as 4491 signed integer time_t. (Thanks to Paul Goyette for reporting 4492 typos in an experimental version of this change.) 4493 4494 (Thanks to Philip Newton for correcting typos in these changes.) 4495 4496 Documentation and commentary is more careful to distinguish UT in 4497 general from UTC in particular. (Thanks to Steve Allen.) 4498 4499 Add a better source for the Zurich 1894 transition. 4500 (Thanks to Pierre-Yves Berger.) 4501 4502 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4503 4504 4505 Release 2013d - 2013-07-05 07:38:01 -0700 4506 4507 Changes affecting future timestamps: 4508 4509 Morocco's midsummer transitions this year are July 7 and August 10, 4510 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4511 4512 Israel now falls back on the last Sunday of October. 4513 (Thanks to Ephraim Silverberg.) 4514 4515 Changes affecting past timestamps: 4516 4517 Specify Jerusalem's location more precisely; this changes the pre-1880 4518 times by 2 s. 4519 4520 Changing affecting metadata only: 4521 4522 Fix typos in the entries for country codes BQ and SX. 4523 4524 Changes affecting code: 4525 4526 Rework the code to fix a bug with handling Australia/Macquarie on 4527 32-bit hosts (thanks to Arthur David Olson). 4528 4529 Port to platforms like NetBSD, where time_t can be wider than long. 4530 4531 Add support for testing time_t types other than the system's. 4532 Run 'make check_time_t_alternatives' to try this out. 4533 Currently, the tests fail for unsigned time_t; 4534 this should get fixed at some point. 4535 4536 Changes affecting documentation and commentary: 4537 4538 Deemphasize the significance of national borders. 4539 4540 Update the zdump man page. 4541 4542 Remove obsolete NOID comment (thanks to Denis Excoffier). 4543 4544 Update several URLs and comments in the web pages. 4545 4546 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4547 4548 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4549 4550 4551 Release 2013c - 2013-04-19 16:17:40 -0700 4552 4553 Changes affecting current and future timestamps: 4554 4555 Palestine observed DST starting March 29, 2013. (Thanks to 4556 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4557 with the predicted rules being the last Thursday in March at 24:00 4558 to the first Friday on or after September 21 at 01:00. 4559 4560 Assume that the recent change to Paraguay's DST rules is permanent, 4561 by moving the end of DST to the 4th Sunday in March every year. 4562 (Thanks to Carlos Ral Perasso.) 4563 4564 Changes affecting past timestamps: 4565 4566 Fix some historical data for Palestine to agree with that of 4567 timeanddate.com, as follows: 4568 4569 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4570 00:00 Apr 1. 4571 4572 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4573 02:00. 4574 4575 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4576 4577 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4578 4579 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4580 4581 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4582 4583 Fix times of habitation for Macquarie to agree with the Tasmania 4584 Parks & Wildlife Service history, which indicates that permanent 4585 habitation was 1899-1919 and 1948 on. 4586 4587 Changing affecting metadata only: 4588 4589 Macquarie Island is politically part of Australia, not Antarctica. 4590 (Thanks to Tobias Conradi.) 4591 4592 Sort Macquarie more consistently with other parts of Australia. 4593 (Thanks to Tim Parenti.) 4594 4595 4596 Release 2013b - 2013-03-10 22:33:40 -0700 4597 4598 Changes affecting current and future timestamps: 4599 4600 Haiti uses US daylight-saving rules this year, and presumably future years. 4601 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4602 4603 Paraguay will end DST on March 24 this year. 4604 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4605 4606 Morocco does not observe DST during Ramadan; 4607 try to predict Ramadan in Morocco as best we can. 4608 (Thanks to Erik Homoet for the heads-up.) 4609 4610 Changes affecting commentary: 4611 4612 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4613 Update URL for Solaris. Mention Internet RFC 6557. 4614 Update Internet RFCs 2445->5545, 2822->5322. 4615 Switch from FTP to HTTP for Internet RFCs. 4616 4617 4618 Release 2013a - 2013-02-27 09:20:35 -0800 4619 4620 Change affecting binary data format: 4621 4622 The zone offset at the end of version-2-format zone files is now 4623 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4624 4625 Changes affecting current and future timestamps: 4626 4627 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4628 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4629 (Thanks to Steffen Thorsen and Robert Elz.) 4630 4631 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4632 (Thanks to Tobias Conradi and Arthur David Olson.) 4633 4634 Many changes affect historical timestamps before 1940. 4635 These were deduced from: Milne J. Civil time. Geogr J. 1899 4636 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4637 4638 Changes affecting the code: 4639 4640 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4641 the data). (Thanks to Arthur David Olson.) 4642 4643 Fix localtime bug when time_t is unsigned and data files were generated 4644 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4645 to Arthur David Olson for fixing.) 4646 4647 Allow the email address for bug reports to be set by the packager. 4648 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4649 4650 Update HTML checking to be compatible with Ubuntu 12.10. 4651 4652 Check that files are a safe subset of ASCII. At some point we may 4653 relax this requirement to a safe subset of UTF-8. Without the 4654 check, some non-UTF-8 encodings were leaking into the distribution. 4655 4656 Commentary changes: 4657 4658 Restore a comment about copyright notices that was inadvertently deleted. 4659 (Thanks to Arthur David Olson.) 4660 4661 Improve the commentary about which districts observe what times 4662 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4663 4664 Add web page links to tz.js. 4665 4666 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4667 4668 4669 Release 2012j - 2012-11-12 18:34:49 -0800 4670 4671 Libya moved to CET this weekend, but with DST planned next year. 4672 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4673 4674 Signatures now have the extension .asc, not .sign, as that's more 4675 standard. (Thanks to Phil Pennock.) 4676 4677 The output of 'zdump --version', and of 'zic --version', now 4678 uses a format that is more typical for --version. 4679 (Thanks to Joseph S. Myers.) 4680 4681 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4682 now uses tz (a] iana.org rather than the old elsie address. 4683 4684 zic -v now complains about abbreviations that are less than 3 4685 or more than 6 characters, as per POSIX. Formerly, it checked 4686 for abbreviations that were more than 3. 4687 4688 'make public' no longer puts its temporary directory under /tmp, 4689 and uses the just-built zic rather than the system zic. 4690 4691 Various fixes to documentation and commentary. 4692 4693 4694 Release 2012i - 2012-11-03 12:57:09 -0700 4695 4696 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4697 4698 Linker flags can now be specified via LDFLAGS. 4699 AWK now defaults to 'awk', not 'nawk'. 4700 The shell in tzselect now defaults to /bin/bash, but this can 4701 be overridden by specifying KSHELL. 4702 The main web page now mentions the unofficial GitHub repository. 4703 (Thanks to Mike Frysinger.) 4704 4705 Tarball signatures can now be built by running 'make signatures'. 4706 There are also new makefile rules 'tarballs', 'check_public', and 4707 separate makefile rules for each tarball and signature file. 4708 A few makefile rules are now more portable to strict POSIX. 4709 4710 The main web page now lists the canonical IANA URL. 4711 4712 4713 Release 2012h - 2012-10-26 22:49:10 -0700 4714 4715 Bahia no longer has DST. (Thanks to Kelley Cook.) 4716 4717 Tocantins has DST. (Thanks to Rodrigo Severo.) 4718 4719 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4720 4721 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4722 4723 Web page updates. 4724 4725 More C modernization, except that at Arthur David Olson's suggestion 4726 the instances of 'register' were kept. 4727 4728 4729 Release 2012g - 2012-10-17 20:59:45 -0700 4730 4731 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4732 4733 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4734 4735 Assume C89. 4736 4737 To attack the version-number problem, this release ships the file 4738 'Makefile' (which contains the release number) in both the tzcode and 4739 the tzdata tarballs. The two Makefiles are identical, and should be 4740 identical in any matching pair of tarballs, so it shouldn't matter 4741 which order you extract the tarballs. Perhaps we can come up with a 4742 better version-number scheme at some point; this scheme does have the 4743 virtue of not adding more files. 4744 4745 4746 Release 2012f - 2012-09-12 23:17:03 -0700 4747 4748 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4749 20 this year. (Thanks to Steffen Thorsen.) 4750 4751 4752 Release 2012e - 2012-08-02 20:44:55 -0700 4753 4754 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4755 (Thanks to Steffen Thorsen.) 4756 4757 * Use a single version number for both code and data. 4758 4759 * .gitignore: New file. 4760 4761 * Remove trailing white space. 4762 4763 4764 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4765 4766 Changes for Morocco's timestamps, which take effect in a couple of 4767 hours, along with infrastructure changes to accommodate how the tz 4768 code and data are released on IANA. 4769 4770 4771 Release data2012c - 2012-03-27 12:17:25 -0400 4772 4773 africa 4774 Summer time changes for Morocco (to start late April 2012) 4775 4776 asia 4777 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4778 4779 northamerica 4780 Haiti following US/Canada rules for 2012 (and we're assuming, 4781 for now anyway, for the future). 4782 4783 4784 Release 2012b - 2012-03-02 12:29:15 +0700 4785 4786 There is just one change to tzcode2012b (compared with 2012a): 4787 the Makefile that was accidentally included with 2012a has been 4788 replaced with the version that should have been there, which is 4789 identical with the previous version (from tzcode2011i). 4790 4791 There are just two changes in tzdata2012b compared with 2012a. 4792 4793 Most significantly, summer time in Cuba has been delayed 3 weeks 4794 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4795 date, as listed in 2012a) is just a little over a week away, this 4796 change is urgent. 4797 4798 Less importantly, an excess tab in one of the changes in zone.tab 4799 in 2012a has been removed. 4800 4801 4802 Release 2012a - 2012-03-01 18:28:10 +0700 4803 4804 The changes in tzcode2012a (compared to the previous version, 2011i) 4805 are entirely to the README and tz-art.htm and tz-link.htm files, if 4806 none of those concern you, you can ignore the code update. The changes 4807 reflect the changed addresses for the mailing list and the code and 4808 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4809 has been added to tz-link.htm). 4810 4811 In tzdata2012a (compared to the previous release, which was 2011n) 4812 the major changes are: 4813 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4814 Falkland Islands onto permanent summer time (we're assuming for the 4815 foreseeable future, though 2012 is all we're fairly certain of.) 4816 Armenia has abolished Summer Time. 4817 Tokelau jumped the International Date Line back last December 4818 (just the same as their near neighbour, Samoa). 4819 America/Creston is a new zone for a small area of British Columbia 4820 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4821 4822 Other minor changes are: 4823 Corrections to 1918 Canadian summer time end dates. 4824 Updated URL for UK time zone history (in comments) 4825 A few typos in Le Corre's list of free French place names (comments) 4826 4827 4828 Release data2011n - 2011-10-30 14:57:54 +0700 4829 4830 There are three changes of note - most urgently, Cuba (America/Havana) 4831 has extended summer time by two weeks, now to end on Nov 13, rather than 4832 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4833 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4834 all, and consequently that zone has been removed (again) and reinstated 4835 in the "backward" file as a link to Europe/Chisinau. And third, the 4836 end date for Fiji's summer time this summer was moved forward from the 4837 earlier planned Feb 26, to Jan 22. 4838 4839 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4840 (and the incorrect syntax that was in the 2011m version of that file 4841 is so fixed - it would have been fixed in a different way had this 4842 change not happened - that's the "missing" sccs version id). 4843 4844 4845 Release data2011m - 2011-10-24 21:42:16 +0700 4846 4847 In particular, the typos in comments in the data (2011-11-17 should have 4848 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4849 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4850 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4851 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4852 4853 In addition, I added Europe/Tiraspol to zone.tab. 4854 4855 This time, all the files have new version numbers... (including the files 4856 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4857 version numbers there...) 4858 4859 4860 Release data2011l - 2011-10-10 11:15:43 +0700 4861 4862 There are just 2 changes that cause different generated tzdata files from 4863 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4864 is included, but commented out. Compared with the diff I sent out last week, 4865 this version also includes attributions for the sources for the changes 4866 (in much the same format as ado used, but the html tags have not been 4867 checked, verified, or used in any way at all, so if there are errors there, 4868 please let me know.) 4869 4870 4871 Release data2011k - 2011-09-20 17:54:03 -0400 4872 4873 [not summarized] 4874 4875 4876 Release data2011j - 2011-09-12 09:22:49 -0400 4877 4878 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4879 Tanzania); there are also two spelling corrections to comments in 4880 the australasia file (with thanks to Christos Zoulas). 4881 4882 4883 Release 2011i - 2011-08-29 05:56:32 -0400 4884 4885 [not summarized] 4886 4887 4888 Release data2011h - 2011-06-15 18:41:48 -0400 4889 4890 Russia and Curaao changes 4891 4892 4893 Release 2011g - 2011-04-25 09:07:22 -0400 4894 4895 update the rules for Egypt to reflect its abandonment of DST this year 4896 4897 4898 Release 2011f - 2011-04-06 17:14:53 -0400 4899 4900 [not summarized] 4901 4902 4903 Release 2011e - 2011-03-31 16:04:38 -0400 4904 4905 Morocco, Chile, and tz-link changes 4906 4907 4908 Release 2011d - 2011-03-14 09:18:01 -0400 4909 4910 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4911 4912 4913 Release 2011c - 2011-03-07 09:30:09 -0500 4914 4915 These do affect current timestamps in Chile and Annette Island, Canada. 4916 4917 4918 Release 2011b - 2011-02-07 08:44:50 -0500 4919 4920 [not summarized] 4921 4922 4923 Release 2011a - 2011-01-24 10:30:16 -0500 4924 4925 [not summarized] 4926 4927 4928 Release data2010o - 2010-11-01 09:18:23 -0400 4929 4930 change to the end of DST in Fiji in 2011 4931 4932 4933 Release 2010n - 2010-10-25 08:19:17 -0400 4934 4935 [not summarized] 4936 4937 4938 Release 2010m - 2010-09-27 09:24:48 -0400 4939 4940 Hong Kong, Vostok, and zic.c changes 4941 4942 4943 Release 2010l - 2010-08-16 06:57:25 -0400 4944 4945 [not summarized] 4946 4947 4948 Release 2010k - 2010-07-26 10:42:27 -0400 4949 4950 [not summarized] 4951 4952 4953 Release 2010j - 2010-05-10 09:07:48 -0400 4954 4955 changes for Baha de Banderas and for version naming 4956 4957 4958 Release data2010i - 2010-04-16 18:50:45 -0400 4959 4960 the end of DST in Morocco on 2010-08-08 4961 4962 4963 Release data2010h - 2010-04-05 09:58:56 -0400 4964 4965 [not summarized] 4966 4967 4968 Release data2010g - 2010-03-24 11:14:53 -0400 4969 4970 [not summarized] 4971 4972 4973 Release 2010f - 2010-03-22 09:45:46 -0400 4974 4975 [not summarized] 4976 4977 4978 Release data2010e - 2010-03-08 14:24:27 -0500 4979 4980 corrects the Dhaka bug found by Danvin Ruangchan 4981 4982 4983 Release data2010d - 2010-03-06 07:26:01 -0500 4984 4985 [not summarized] 4986 4987 4988 Release 2010c - 2010-03-01 09:20:58 -0500 4989 4990 changes including KRE's suggestion for earlier initialization of 4991 "goahead" and "goback" structure elements 4992 4993 4994 Release code2010a - 2010-02-16 10:40:04 -0500 4995 4996 [not summarized] 4997 4998 4999 Release data2010b - 2010-01-20 12:37:01 -0500 5000 5001 Mexico changes 5002 5003 5004 Release data2010a - 2010-01-18 08:30:04 -0500 5005 5006 changes to Dhaka 5007 5008 5009 Release data2009u - 2009-12-26 08:32:28 -0500 5010 5011 changes to DST in Bangladesh 5012 5013 5014 Release 2009t - 2009-12-21 13:24:27 -0500 5015 5016 [not summarized] 5017 5018 5019 Release data2009s - 2009-11-14 10:26:32 -0500 5020 5021 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5022 5023 5024 Release 2009r - 2009-11-09 10:10:31 -0500 5025 5026 "antarctica" and "tz-link.htm" changes 5027 5028 5029 Release 2009q - 2009-11-02 09:12:40 -0500 5030 5031 with two corrections as reported by Eric Muller and Philip Newton 5032 5033 5034 Release data2009p - 2009-10-23 15:05:27 -0400 5035 5036 Argentina (including San Luis) changes (with the correction from 5037 Mariano Absatz) 5038 5039 5040 Release data2009o - 2009-10-14 16:49:38 -0400 5041 5042 Samoa (commentary only), Pakistan, and Bangladesh changes 5043 5044 5045 Release data2009n - 2009-09-22 15:13:38 -0400 5046 5047 added commentary for Argentina and a change to the end of DST in 5048 2009 in Pakistan 5049 5050 5051 Release data2009m - 2009-09-03 10:23:43 -0400 5052 5053 Samoa and Palestine changes 5054 5055 5056 Release data2009l - 2009-08-14 09:13:07 -0400 5057 5058 Samoa (comments only) and Egypt 5059 5060 5061 Release 2009k - 2009-07-20 09:46:08 -0400 5062 5063 [not summarized] 5064 5065 5066 Release data2009j - 2009-06-15 06:43:59 -0400 5067 5068 Bangladesh change (with a short turnaround since the DST change is 5069 impending) 5070 5071 5072 Release 2009i - 2009-06-08 09:21:22 -0400 5073 5074 updating for DST in Bangladesh this year 5075 5076 5077 Release 2009h - 2009-05-26 09:19:14 -0400 5078 5079 [not summarized] 5080 5081 5082 Release data2009g - 2009-04-20 16:34:07 -0400 5083 5084 Cairo 5085 5086 5087 Release data2009f - 2009-04-10 11:00:52 -0400 5088 5089 correct DST in Pakistan 5090 5091 5092 Release 2009e - 2009-04-06 09:08:11 -0400 5093 5094 [not summarized] 5095 5096 5097 Release 2009d - 2009-03-23 09:38:12 -0400 5098 5099 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5100 5101 5102 Release data2009c - 2009-03-16 09:47:51 -0400 5103 5104 change to the start of Cuban DST 5105 5106 5107 Release 2009b - 2009-02-09 11:15:22 -0500 5108 5109 [not summarized] 5110 5111 5112 Release 2009a - 2009-01-21 10:09:39 -0500 5113 5114 [not summarized] 5115 5116 5117 Release data2008i - 2008-10-21 12:10:25 -0400 5118 5119 southamerica and zone.tab files, with Argentina DST rule changes and 5120 United States zone reordering and recommenting 5121 5122 5123 Release 2008h - 2008-10-13 07:33:56 -0400 5124 5125 [not summarized] 5126 5127 5128 Release 2008g - 2008-10-06 09:03:18 -0400 5129 5130 Fix a broken HTML anchor and update Brazil's DST transitions; 5131 there's also a slight reordering of information in tz-art.htm. 5132 5133 5134 Release data2008f - 2008-09-09 22:33:26 -0400 5135 5136 [not summarized] 5137 5138 5139 Release 2008e - 2008-07-28 14:11:17 -0400 5140 5141 changes by Arthur David Olson and Jesper Nrgaard Welen 5142 5143 5144 Release data2008d - 2008-07-07 09:51:38 -0400 5145 5146 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5147 5148 5149 Release data2008c - 2008-05-19 17:48:03 -0400 5150 5151 Pakistan, Morocco, and Mongolia 5152 5153 5154 Release data2008b - 2008-03-24 08:30:59 -0400 5155 5156 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5157 link provided 5158 5159 5160 Release 2008a - 2008-03-08 05:42:16 -0500 5161 5162 [not summarized] 5163 5164 5165 Release 2007k - 2007-12-31 10:25:22 -0500 5166 5167 most importantly, changes to the "southamerica" file based on 5168 Argentina's readoption of daylight saving time 5169 5170 5171 Release 2007j - 2007-12-03 09:51:01 -0500 5172 5173 1. eliminate the "P" (parameter) macro; 5174 5175 2. the "noncontroversial" changes circulated on the time zone 5176 mailing list (less the changes to "logwtmp.c"); 5177 5178 3. eliminate "too many transition" errors when "min" is used in time 5179 zone rules; 5180 5181 4. changes by Paul Eggert (including updated information for Venezuela). 5182 5183 5184 Release data2007i - 2007-10-30 10:28:11 -0400 5185 5186 changes for Cuba and Syria 5187 5188 5189 Release 2007h - 2007-10-01 10:05:51 -0400 5190 5191 changes by Paul Eggert, as well as an updated link to the ICU 5192 project in tz-link.htm 5193 5194 5195 Release 2007g - 2007-08-20 10:47:59 -0400 5196 5197 changes by Paul Eggert 5198 5199 The "leapseconds" file has been updated to incorporate the most 5200 recent International Earth Rotation and Reference Systems Service 5201 (IERS) bulletin. 5202 5203 There's an addition to tz-art.htm regarding the television show "Medium". 5204 5205 5206 Release 2007f - 2007-05-07 10:46:46 -0400 5207 5208 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5209 Zealand) 5210 5211 changes to zic.c to allow hour values greater than 24 (along with 5212 Paul's improved time value overflow checking) 5213 5214 5215 Release 2007e - 2007-04-02 10:11:52 -0400 5216 5217 Syria and Honduras changes by Paul Eggert 5218 5219 zic.c variable renaming changes by Arthur David Olson 5220 5221 5222 Release 2007d - 2007-03-20 08:48:30 -0400 5223 5224 changes by Paul Eggert 5225 5226 the elimination of white space at the ends of lines 5227 5228 5229 Release 2007c - 2007-02-26 09:09:37 -0500 5230 5231 changes by Paul Eggert 5232 5233 5234 Release 2007b - 2007-02-12 09:34:20 -0500 5235 5236 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5237 5238 changes to the commentary in "leapseconds" reflecting the IERS 5239 announcement that there is to be no positive leap second at the end 5240 of June 2007. 5241 5242 5243 Release 2007a - 2007-01-08 12:28:29 -0500 5244 5245 changes by Paul Eggert 5246 5247 Derick Rethans's Asmara change 5248 5249 Oscar van Vlijmen's Easter Island local mean time change 5250 5251 symbolic link changes 5252 5253 5254 Release 2006p - 2006-11-27 08:54:27 -0500 5255 5256 changes by Paul Eggert 5257 5258 5259 Release 2006o - 2006-11-06 09:18:07 -0500 5260 5261 changes by Paul Eggert 5262 5263 5264 Release 2006n - 2006-10-10 11:32:06 -0400 5265 5266 changes by Paul Eggert 5267 5268 5269 Release 2006m - 2006-10-02 15:32:35 -0400 5270 5271 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5272 5273 (minimalist) changes to zic.8 to clarify "until" information 5274 5275 5276 Release data2006l - 2006-09-18 12:58:11 -0400 5277 5278 Paul's best-effort work on this coming weekend's Egypt time change 5279 5280 5281 Release 2006k - 2006-08-28 12:19:09 -0400 5282 5283 changes by Paul Eggert 5284 5285 5286 Release 2006j - 2006-08-21 09:56:32 -0400 5287 5288 changes by Paul Eggert 5289 5290 5291 Release code2006i - 2006-08-07 12:30:55 -0400 5292 5293 localtime.c fixes 5294 5295 Ken Pizzini's conversion script 5296 5297 5298 Release code2006h - 2006-07-24 09:19:37 -0400 5299 5300 adds public domain notices to four files 5301 5302 includes a fix for transition times being off by a second 5303 5304 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5305 5306 5307 Release 2006g - 2006-05-08 17:18:09 -0400 5308 5309 northamerica changes by Paul Eggert 5310 5311 5312 Release 2006f - 2006-05-01 11:46:00 -0400 5313 5314 a missing version number problem is fixed (with thanks to Bradley 5315 White for catching the problem) 5316 5317 5318 Release 2006d - 2006-04-17 14:33:43 -0400 5319 5320 changes by Paul Eggert 5321 5322 added new items to tz-arts.htm that were found by Paul 5323 5324 5325 Release 2006c - 2006-04-03 10:09:32 -0400 5326 5327 two sets of data changes by Paul Eggert 5328 5329 a fencepost error fix in zic.c 5330 5331 changes to zic.c and the "europe" file to minimize differences 5332 between output produced by the old 32-bit zic and the new 64-bit 5333 version 5334 5335 5336 Release 2006b - 2006-02-20 10:08:18 -0500 5337 [tz32code2006b + tz64code2006b + tzdata2006b] 5338 5339 64-bit code 5340 5341 All SCCS IDs were bumped to "8.1" for this release. 5342 5343 5344 Release 2006a - 2006-01-30 08:59:31 -0500 5345 5346 changes by Paul Eggert (in particular, Indiana time zone moves) 5347 5348 an addition to the zic manual page to describe how special-case 5349 transitions are handled 5350 5351 5352 Release 2005r - 2005-12-27 09:27:13 -0500 5353 5354 Canadian changes by Paul Eggert 5355 5356 They also add "<pre>" directives to time zone data files and reflect 5357 changes to warning message logic in "zdump.c" (but with calls to 5358 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5359 5360 5361 Release 2005q - 2005-12-13 09:17:09 -0500 5362 5363 Nothing earth-shaking here: 5364 1. Electronic mail addresses have been removed. 5365 2. Casts of the return value of exit have been removed. 5366 3. Casts of the argument of is.* macros have been added. 5367 4. Indentation in one section of zic.c has been fixed. 5368 5. References to dead URLs in the data files have been dealt with. 5369 5370 5371 Release 2005p - 2005-12-05 10:30:53 -0500 5372 5373 "systemv", "tz-link.htm", and "zdump.c" changes 5374 (less the casts of arguments to the is* macros) 5375 5376 5377 Release 2005o - 2005-11-28 10:55:26 -0500 5378 5379 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5380 5381 zdump.c lint fixes by Arthur David Olson 5382 5383 5384 Release 2005n - 2005-10-03 09:44:09 -0400 5385 5386 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5387 et al. changes) 5388 5389 5390 Release 2005m - 2005-08-29 12:15:40 -0400 5391 5392 changes by Paul Eggert (with a small tweak to the tz-art change) 5393 5394 a declaration of an unused variable has been removed from zdump.c 5395 5396 5397 Release 2005l - 2005-08-22 12:06:39 -0400 5398 5399 changes by Paul Eggert 5400 5401 overflow/underflow checks by Arthur David Olson, minus changes to 5402 the "Theory" file about the pending addition of 64-bit data (I grow 5403 less confident of the changes being accepted with each passing day, 5404 and the changes no longer increase the data files nine-fold--there's 5405 less than a doubling in size by my local Sun's reckoning) 5406 5407 5408 Release 2005k - 2005-07-14 14:14:24 -0400 5409 5410 The "leapseconds" file has been edited to reflect the recently 5411 announced leap second at the end of 2005. 5412 5413 I've also deleted electronic mail addresses from the files as an 5414 anti-spam measure. 5415 5416 5417 Release 2005j - 2005-06-13 14:34:13 -0400 5418 5419 These reflect changes to limit the length of time zone abbreviations 5420 and the characters used in those abbreviations. 5421 5422 There are also changes to handle POSIX-style "quoted" timezone 5423 environment variables. 5424 5425 The changes were circulated on the time zone mailing list; the only 5426 change since then was the removal of a couple of minimum-length of 5427 abbreviation checks. 5428 5429 5430 Release data2005i - 2005-04-21 15:04:16 -0400 5431 5432 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5433 5434 5435 Release 2005h - 2005-04-04 11:24:47 -0400 5436 5437 changes by Paul Eggert 5438 5439 minor changes to Makefile and zdump.c to produce more useful output 5440 when doing a "make typecheck" 5441 5442 5443 Release 2005g - 2005-03-14 10:11:21 -0500 5444 5445 changes by Paul Eggert (a change to current DST rules in Uruguay and 5446 an update to a link to time zone software) 5447 5448 5449 Release 2005f - 2005-03-01 08:45:32 -0500 5450 5451 data and documentation changes by Paul Eggert 5452 5453 5454 Release 2005e - 2005-02-10 15:59:44 -0500 5455 5456 [not summarized] 5457 5458 5459 Release code2005d - 2005-01-31 09:21:47 -0500 5460 5461 make zic complain about links to links if the -v flag is used 5462 5463 have "make public" do more code checking 5464 5465 add an include to "localtime.c" for the benefit of gcc systems 5466 5467 5468 Release 2005c - 2005-01-17 18:36:29 -0500 5469 5470 get better results when mktime runs on a system where time_t is double 5471 5472 changes to the data files (most importantly to Paraguay) 5473 5474 5475 Release 2005b - 2005-01-10 09:19:54 -0500 5476 5477 Get localtime and gmtime working on systems with exotic time_t types. 5478 5479 Update the leap second commentary in the "leapseconds" file. 5480 5481 5482 Release 2005a - 2005-01-01 13:13:44 -0500 5483 5484 [not summarized] 5485 5486 5487 Release code2004i - 2004-12-14 13:42:58 -0500 5488 5489 Deal with systems where time_t is unsigned. 5490 5491 5492 Release code2004h - 2004-12-07 11:40:18 -0500 5493 5494 64-bit-time_t changes 5495 5496 5497 Release 2004g - 2004-11-02 09:06:01 -0500 5498 5499 update to Cuba (taking effect this weekend) 5500 5501 other changes by Paul Eggert 5502 5503 correction of the spelling of Oslo 5504 5505 changed versions of difftime.c and private.h 5506 5507 5508 Release code2004f - 2004-10-21 10:25:22 -0400 5509 5510 Cope with wide-ranging tm_year values. 5511 5512 5513 Release 2004e - 2004-10-11 14:47:21 -0400 5514 5515 Brazil/Argentina/Israel changes by Paul Eggert 5516 5517 changes to tz-link.htm by Paul 5518 5519 one small fix to Makefile 5520 5521 5522 Release 2004d - 2004-09-22 08:27:29 -0400 5523 5524 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5525 5526 5527 Release 2004c - 2004-08-11 12:06:26 -0400 5528 5529 asctime-related changes 5530 5531 (variants of) some of the documentation changes suggested by Paul Eggert 5532 5533 5534 Release 2004b - 2004-07-19 14:33:35 -0400 5535 5536 data changes by Paul Eggert - most importantly, updates for Argentina 5537 5538 5539 Release 2004a - 2004-05-27 12:00:47 -0400 5540 5541 changes by Paul Eggert 5542 5543 Handle DST transitions that occur at the end of a month in some 5544 years but at the start of the following month in other years. 5545 5546 Add a copy of the correspondence that's the basis for claims about 5547 DST in the Navajo Nation. 5548 5549 5550 Release 2003e - 2003-12-15 09:36:47 -0500 5551 5552 changes by Arthur David Olson (primarily code changes) 5553 5554 changes by Paul Eggert (primarily data changes) 5555 5556 minor changes to "Makefile" and "northamerica" (in the latter case, 5557 optimization of the "Toronto" rules) 5558 5559 5560 Release 2003d - 2003-10-06 09:34:44 -0400 5561 5562 changes by Paul Eggert 5563 5564 5565 Release 2003c - 2003-09-16 10:47:05 -0400 5566 5567 Fix bad returns in zic.c's inleap function. 5568 Thanks to Bradley White for catching the problem! 5569 5570 5571 Release 2003b - 2003-09-16 07:13:44 -0400 5572 5573 Add a "--version" option (and documentation) to the zic and zdump commands. 5574 5575 changes to overflow/underflow checking in zic 5576 5577 a localtime typo fix. 5578 5579 Update the leapseconds and tz-art.htm files. 5580 5581 5582 Release 2003a - 2003-03-24 09:30:54 -0500 5583 5584 changes by Paul Eggert 5585 5586 a few additions and modifications to the tz-art.htm file 5587 5588 5589 Release 2002d - 2002-10-15 13:12:42 -0400 5590 5591 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5592 5593 There's also a new time zone quote in "tz-art.htm". 5594 5595 5596 Release 2002c - 2002-04-04 11:55:20 -0500 5597 5598 changes by Paul Eggert 5599 5600 Change zic.c to avoid creating symlinks to files that don't exist. 5601 5602 5603 Release 2002b - 2002-01-28 12:56:03 -0500 5604 5605 [These change notes are for Release 2002a, which was corrupted. 5606 2002b was a corrected version of 2002a.] 5607 5608 changes by Paul Eggert 5609 5610 Update the "leapseconds" file to note that there'll be no leap 5611 second at the end of June, 2002. 5612 5613 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5614 5615 Change to "difftime.c" to avoid sizeof problems. 5616 5617 5618 Release 2001d - 2001-10-09 13:31:32 -0400 5619 5620 changes by Paul Eggert 5621 5622 5623 Release 2001c - 2001-06-05 13:59:55 -0400 5624 5625 changes by Paul Eggert and Andrew Brown 5626 5627 5628 Release 2001b - 2001-04-05 16:44:38 -0400 5629 5630 changes by Paul Eggert (modulo jnorgard's typo fix) 5631 5632 tz-art.htm has been HTMLified. 5633 5634 5635 Release 2001a - 2001-03-13 12:57:44 -0500 5636 5637 changes by Paul Eggert 5638 5639 An addition to the "leapseconds" file: comments with the text of the 5640 latest IERS leap second notice. 5641 5642 Trailing white space has been removed from data file lines, and 5643 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5644 converted to tabs. 5645 5646 5647 Release 2000h - 2000-12-14 15:33:38 -0500 5648 5649 changes by Paul Eggert 5650 5651 one typo fix in the "art" file 5652 5653 With providence, this is the last update of the millennium. 5654 5655 5656 Release 2000g - 2000-10-10 11:35:22 -0400 5657 5658 changes by Paul Eggert 5659 5660 correction of John Mackin's name submitted by Robert Elz 5661 5662 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5663 Emmy Awards broadcast. 5664 5665 5666 Release 2000f - 2000-08-10 09:31:58 -0400 5667 5668 changes by Paul Eggert 5669 5670 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5671 5672 Error checking and messages in the "yearistype" script have been 5673 improved. 5674 5675 5676 Release 2000e - 2000-07-31 09:27:54 -0400 5677 5678 data changes by Paul Eggert 5679 5680 a change to the default value of the defined constant HAVE_STRERROR 5681 5682 the addition of a Dave Barry quote on DST to the tz-arts file 5683 5684 5685 Release 2000d - 2000-04-20 15:43:04 -0400 5686 5687 changes to the documentation and code of strftime for C99 conformance 5688 5689 a bug fix for date.c 5690 5691 These are based on (though modified from) changes by Paul Eggert. 5692 5693 5694 Release 2000c - 2000-03-04 10:31:43 -0500 5695 5696 changes by Paul Eggert 5697 5698 5699 Release 2000b - 2000-02-21 12:16:29 -0500 5700 5701 changes by Paul Eggert and Joseph Myers 5702 5703 modest tweaks to the tz-art.htm and tz-link.htm files 5704 5705 5706 Release 2000a - 2000-01-18 09:21:26 -0500 5707 5708 changes by Paul Eggert 5709 5710 The two hypertext documents have also been renamed. 5711 5712 5713 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5714 5715 Paul Eggert's changes 5716 5717 additions to the "zic" manual page and the "Arts.htm" file 5718 5719 5720 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5721 5722 [not summarized] 5723 5724 5725 Release data1999h - 1999-10-07 03:50:29 -0400 5726 5727 changes by Paul Eggert to "europe" (most importantly, fixing 5728 Lithuania and Estonia) 5729 5730 5731 Release 1999g - 1999-09-28 11:06:18 -0400 5732 5733 data changes by Paul Eggert (most importantly, the change for 5734 Lebanon that buys correctness for this coming Sunday) 5735 5736 The "code" file contains changes to "Makefile" and "checktab.awk" to 5737 allow better checking of time zone files before they are published. 5738 5739 5740 Release 1999f - 1999-09-23 09:48:14 -0400 5741 5742 changes by Arthur David Olson and Paul Eggert 5743 5744 5745 Release 1999e - 1999-08-17 15:20:54 -0400 5746 5747 changes circulated by Paul Eggert, although the change to handling 5748 of DST-specifying timezone names has been commented out for now 5749 (search for "XXX" in "localtime.c" for details). These files also 5750 do not make any changes to the start of DST in Brazil. 5751 5752 In addition to Paul's changes, there are updates to "Arts.htm" and 5753 cleanups of URLs. 5754 5755 5756 Release 1999d - 1999-03-30 11:31:07 -0500 5757 5758 changes by Paul Eggert 5759 5760 The Makefile's "make public" rule has also been changed to do a test 5761 compile of each individual time zone data file (which should help 5762 avoid problems such as the one we had with Nicosia). 5763 5764 5765 Release 1999c - 1999-03-25 09:47:47 -0500 5766 5767 changes by Paul Eggert, most importantly the change for Chile. 5768 5769 5770 Release 1999b - 1999-02-01 17:51:44 -0500 5771 5772 changes by Paul Eggert 5773 5774 code changes (suggested by Mani Varadarajan, mani at be.com) for 5775 correct handling of symbolic links when building using a relative directory 5776 5777 code changes to generate correct messages for failed links 5778 5779 updates to the URLs in Arts.htm 5780 5781 5782 Release 1999a - 1999-01-19 16:20:29 -0500 5783 5784 error message internationalizations and corrections in zic.c and 5785 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5786 to whom thanks!) 5787 5788 5789 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5790 5791 changes for Brazil, Chile, and Germany 5792 5793 support for use of "24:00" in the input files for the time zone compiler 5794 5795 5796 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5797 5798 changes by Paul Eggert 5799 5800 correction to a define in the "private.h" file 5801 5802 5803 Release data1998g - 1998-08-11 03:28:35 -0000 5804 [tzdata1998g.tar.gz is missing!] 5805 5806 Lithuanian change provided by mgedmin at pub.osf.it 5807 5808 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5809 "backward") to ensure that the GMT file is created even where folks 5810 don't want the "backward" links (as suggested by Paul Eggert). 5811 5812 5813 Release data1998f - 1998-07-20 13:50:00 -0000 5814 [tzdata1998f.tar.gz is missing!] 5815 5816 Update the "leapseconds" file to include the newly announced 5817 insertion at the end of 1998. 5818 5819 5820 Release code1998f - 1998-06-01 10:18:31 -0400 5821 5822 addition to localtime.c by Guy Harris 5823 5824 5825 Release 1998e - 1998-05-28 09:56:26 -0400 5826 5827 The Makefile is changed to produce zoneinfo-posix rather than 5828 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5829 zoneinfo/right. 5830 5831 data changes by Paul Eggert 5832 5833 changes from Guy Harris to provide asctime_r and ctime_r 5834 5835 A usno1998 file (substantially identical to usno1997) has been added. 5836 5837 5838 Release 1998d - 1998-05-14 11:58:34 -0400 5839 5840 changes to comments (in particular, elimination of references to CIA maps). 5841 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5842 where changes occur. 5843 5844 5845 Release 1998c - 1998-02-28 12:32:26 -0500 5846 5847 changes by Paul Eggert (save the "French correction," on which I'll 5848 wait for the dust to settle) 5849 5850 symlink changes 5851 5852 changes and additions to Arts.htm 5853 5854 5855 Release 1998b - 1998-01-17 14:31:51 -0500 5856 5857 URL cleanups and additions 5858 5859 5860 Release 1998a - 1998-01-13 12:37:35 -0500 5861 5862 changes by Paul Eggert 5863 5864 5865 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5866 5867 changes by Paul Eggert, with minor modifications from Arthur David 5868 Olson to make the files more browser friendly 5869 5870 5871 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5872 5873 minor changes to put "TZif" at the start of each timezone information file 5874 5875 a rule has also been added to the Makefile so you can 5876 make zones 5877 to just recompile the zone information files (rather than doing a 5878 full "make install" with its other effects). 5879 5880 5881 Release data1997i - 1997-10-07 08:45:38 -0400 5882 5883 changes to Africa by Paul Eggert 5884 5885 5886 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5887 5888 corrections for Uruguay (and other locations) 5889 5890 Arthur David Olson's simple-minded fix allowing mktime to both 5891 correctly handle leap seconds and correctly handle tm_sec values 5892 upon which arithmetic has been performed. 5893 5894 5895 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5896 5897 Paul Eggert's updates 5898 5899 a small change to a function prototype; 5900 5901 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5902 include information on Around the World in Eighty Days. 5903 5904 5905 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5906 5907 fixes to zic's error handling 5908 5909 changes inspired by the item circulated on Slovenia 5910 5911 The description of Web resources has been HTMLified for browsing 5912 convenience. 5913 5914 A new piece of tz-related music has been added to the "Music" file. 5915 5916 5917 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5918 5919 Paul Eggert's latest suggestions 5920 5921 5922 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5923 5924 changes to "zic.c" to correct performance of the "-s" option 5925 5926 a new file "usno1997" 5927 5928 5929 Release data1997c - 1997-03-04 09:58:18 -0500 5930 5931 changes in Israel 5932 5933 5934 Release 1997b - 1997-02-27 18:34:19 -0500 5935 5936 The data file incorporates the 1997 leap second. 5937 5938 The code file incorporates Arthur David Olson's take on the 5939 zic/multiprocessor/directory-creation situation. 5940 5941 5942 Release 1997a - 1997-01-21 09:11:10 -0500 5943 5944 Paul Eggert's Antarctica (and other changes) 5945 5946 Arthur David Olson finessed the "getopt" issue by checking against 5947 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5948 is returned while SunOS 5.5's manual says EOF is returned). 5949 5950 5951 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5952 5953 Paul Eggert's latest changes 5954 5955 5956 Release code1996n - 1996-12-16 09:42:02 -0500 5957 5958 link snapping fix from Bruce Evans (via Garrett Wollman) 5959 5960 5961 Release data1996m - 1996-11-24 02:37:34 -0000 5962 [tzdata1996m.tar.gz is missing!] 5963 5964 Paul Eggert's batch of changes 5965 5966 5967 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5968 5969 No functional changes here; the files have simply been changed to 5970 make more use of ISO style dates in comments. The names of the above 5971 files now include the year in full. 5972 5973 5974 Release code96l - 1996-09-08 17:12:20 -0400 5975 5976 tzcode96k was missing a couple of pieces. 5977 5978 5979 Release 96k - 1996-09-08 16:06:22 -0400 5980 5981 the latest round of changes from Paul Eggert 5982 5983 the recent Year 2000 material 5984 5985 5986 Release code96j - 1996-07-30 13:18:53 -0400 5987 5988 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5989 5990 5991 Release code96i - 1996-07-27 20:11:35 -0400 5992 5993 Paul's suggested patch for strftime %V week numbers 5994 5995 5996 Release data96i - 1996-07-01 18:13:04 -0400 5997 5998 "northamerica" and "europe" changes by Paul Eggert 5999 6000 6001 Release code96h - 1996-06-05 08:02:21 -0400 6002 6003 fix for handling transitions specified in Universal Time 6004 6005 Some "public domain" notices have also been added. 6006 6007 6008 Release code96g - 1996-05-16 14:00:26 -0400 6009 6010 fix for the simultaneous-DST-and-zone-change challenge 6011 6012 6013 Release data96h - 1996-05-09 17:40:51 -0400 6014 6015 changes by Paul Eggert 6016 6017 6018 Release code96f-data96g - 1996-05-03 03:09:59 -0000 6019 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6020 6021 The changes get us some of the way to fixing the problems noted in Paul 6022 Eggert's letter yesterday (in addition to a few others). The approach 6023 has been to make zic a bit smarter about figuring out what time zone 6024 abbreviations apply just after the time specified in the "UNTIL" part 6025 of a zone line. Putting the smarts in zic means avoiding having 6026 transition times show up in both "Zone" lines and "Rule" lines, which 6027 in turn avoids multiple transition time entries in time zone files. 6028 (This also makes the zic input files such as "europe" a bit shorter and 6029 should ease maintenance.) 6030 6031 6032 Release data96f - 1996-04-19 19:20:03 -0000 6033 [tzdata96f.tar.gz is missing!] 6034 6035 The only changes are to the "northamerica" file; the time zone 6036 abbreviation for Denver is corrected to MST (and MDT), and the 6037 comments for Mexico have been updated. 6038 6039 6040 Release data96e - 1996-03-19 17:37:26 -0500 6041 6042 Proposals by Paul Eggert, in particular the Portugal change that 6043 comes into play at the end of this month. 6044 6045 6046 Release data96d - 1996-03-18 20:49:39 -0500 6047 6048 [not summarized] 6049 6050 6051 Release code96e - 1996-02-29 15:43:27 -0000 6052 [tzcode96e.tar.gz is missing!] 6053 6054 internationalization changes and the fix to the documentation for strftime 6055 6056 6057 Release code96d-data96c - 1996-02-12 11:05:27 -0500 6058 6059 The "code" file simply updates Bob Kridle's electronic address. 6060 6061 The "data" file updates rules for Mexico. 6062 6063 6064 Release data96b - 1996-01-27 15:44:42 -0500 6065 6066 Kiribati change 6067 6068 6069 Release code96c - 1996-01-16 16:58:15 -0500 6070 6071 leap-year streamlining and binary-search changes 6072 6073 fix to newctime.3 6074 6075 6076 Release code96b - 1996-01-10 20:42:39 -0500 6077 6078 fixes and enhancements from Paul Eggert, including code that 6079 emulates the behavior of recent versions of the SunOS "date" 6080 command. 6081 6082 6083 Release 96a - 1996-01-06 09:08:24 -0500 6084 6085 Israel updates 6086 6087 fixes to strftime.c for correct ISO 8601 week number generation, 6088 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6089 numbers (which are not necessarily the same as calendar year numbers) 6090 6091 6092 Release code95i-data95m - 1995-12-21 12:46:47 -0500 6093 6094 The latest revisions from Paul Eggert are included, the usno1995 6095 file has been updated, and a new file ("WWW") covering useful URLs 6096 has been added. 6097 6098 6099 Release code95h-data95l - 1995-12-19 18:10:12 -0500 6100 6101 A simplification of a macro definition, a change to data for Sudan, 6102 and (for last minute shoppers) notes in the "Music" file on the CD 6103 "Old Man Time". 6104 6105 6106 Release code95g-data95k - 1995-10-30 10:32:47 -0500 6107 6108 (slightly reformatted) 8-bit-clean proposed patch 6109 6110 minor patch: US/Eastern -> America/New_York 6111 6112 snapshot of the USNO's latest data ("usno1995") 6113 6114 some other minor cleanups 6115 6116 6117 Release code95f-data95j - 1995-10-28 21:01:34 -0000 6118 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6119 6120 European cleanups 6121 6122 support for 64-bit time_t's 6123 6124 optimization in localtime.c 6125 6126 6127 Release code95e - 1995-10-13 13:23:57 -0400 6128 6129 the mktime change to scan from future to past when trying to find time zone 6130 offsets 6131 6132 6133 Release data95i - 1995-09-26 10:43:26 -0400 6134 6135 For Canada/Central, guess that the Sun customer's "one week too 6136 early" was just a approximation, and the true error is one month 6137 too early. This is consistent with the rest of Canada. 6138 6139 6140 Release data95h - 1995-09-21 11:26:48 -0400 6141 6142 latest changes from Paul Eggert 6143 6144 6145 Release code95d - 1995-09-14 11:14:45 -0400 6146 6147 the addition of a "Music" file, which documents four recorded 6148 versions of the tune "Save That Time". 6149 6150 6151 Release data95g - 1995-09-01 17:21:36 -0400 6152 6153 "yearistype" correction 6154 6155 6156 Release data95f - 1995-08-28 20:46:56 -0400 6157 6158 Paul Eggert's change to the australasia file 6159 6160 6161 Release data95e - 1995-07-08 18:02:34 -0400 6162 6163 The only change is a leap second at the end of this year. 6164 Thanks to Bradley White for forwarding news on the leap second. 6165 6166 6167 Release data95d - 1995-07-03 13:26:22 -0400 6168 6169 Paul Eggert's changes 6170 6171 6172 Release data95c - 1995-07-02 19:19:28 -0400 6173 6174 changes to "asia", "backward", "europe", and "southamerica" 6175 (read: northamericacentrics need not apply) 6176 6177 6178 Release code95c - 1995-03-13 14:00:46 -0500 6179 6180 one-line fix for sign extension problems in detzcode 6181 6182 6183 Release 95b - 1995-03-04 11:22:38 -0500 6184 6185 Minor changes in both: 6186 6187 The "code" file contains a workaround for the lack of "unistd.h" in 6188 Microsoft C++ version 7. 6189 6190 The "data" file contains a fixed "Link" for America/Shiprock. 6191 6192 6193 Release 94h - 1994-12-10 12:51:14 -0500 6194 6195 The files: 6196 6197 * incorporate the changes to "zdump" and "date" to make changes to 6198 the "TZ" environment variable permanent; 6199 6200 * incorporate the table changes by Paul Eggert; 6201 6202 * include (and document) support for universal time specifications in 6203 data files - but do not (yet) include use of this feature in the 6204 data files. 6205 6206 Think of this as "TZ Classic" - the software has been set up not to break if 6207 universal time shows up in its input, and data entries have been 6208 left as is so as not to break existing implementations. 6209 6210 6211 Release data94f - 1994-08-20 12:56:09 -0400 6212 6213 (with thanks!) the latest data updates from Paul Eggert 6214 6215 6216 Release data94e - 1994-06-04 13:13:53 -0400 6217 6218 [not summarized] 6219 6220 6221 Release code94g - 1994-05-05 12:14:07 -0400 6222 6223 fix missing "optind.c" and a reference to it in the Makefile 6224 6225 6226 Release code94f - 1994-05-05 13:00:33 -0000 6227 [tzcode94f.tar.gz is missing!] 6228 6229 changes to avoid overflow in difftime, as well as changes to cope 6230 with the 52/53 challenge in strftime 6231 6232 6233 Release code94e - 1994-03-30 23:32:59 -0500 6234 6235 change for the benefit of PCTS 6236 6237 6238 Release 94d - 1994-02-24 15:42:25 -0500 6239 6240 Avoid clashes with POSIX semantics for zones such as GMT+4. 6241 6242 Some other very minor housekeeping is also present. 6243 6244 6245 Release code94c - 1994-02-10 08:52:40 -0500 6246 6247 Fix bug where mkdirs was broken unless you compile with 6248 -fwritable-strings (which is generally losing to do). 6249 6250 6251 Release 94b - 1994-02-07 10:04:33 -0500 6252 6253 work by Paul Eggert who notes: 6254 6255 I found another book of time zone histories by E W Whitman; it's not 6256 as extensive as Shanks but has a few goodies of its own. I used it 6257 to update the tables. I also fixed some more as a result of 6258 correspondence with Adam David and Peter Ilieve, and move some stray 6259 links from 'europe' to 'backward'. I corrected some scanning errors 6260 in usno1989. 6261 6262 As far as the code goes, I fixed zic to allow years in the range 6263 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6264 And I cleaned up the zic documentation a little bit. 6265 6266 6267 Release data94a - 1994-02-03 08:58:54 -0500 6268 6269 It simply incorporates the recently announced leap second into the 6270 "leapseconds" file. 6271 6272 6273 Release 93g - 1993-11-22 17:28:27 -0500 6274 6275 Paul Eggert has provided a good deal of historic information (based 6276 on Shanks), and there are some code changes to deal with the buglets 6277 that crawled out in dealing with the new information. 6278 6279 6280 Release 93f - 1993-10-15 12:27:46 -0400 6281 6282 Paul Eggert's changes 6283 6284 6285 Release 93e - 1993-09-05 21:21:44 -0400 6286 6287 This has updated data for Israel, England, and Kwajalein. There's 6288 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6289 Thanks to Paul Eggert and Peter Ilieve for the changes. 6290 6291 6292 Release 93d - 1993-06-17 23:34:17 -0400 6293 6294 new fix and new data on Israel 6295 6296 6297 Release 93c - 1993-06-06 19:31:55 -0400 6298 6299 [not summarized] 6300 6301 6302 Release 93b - 1993-02-02 14:53:58 -0500 6303 6304 updated "leapseconds" file 6305 6306 6307 Release 93 - 1993-01-08 07:01:06 -0500 6308 6309 At kre's suggestion, the package has been split in two - a code piece 6310 (which also includes documentation) that's only of use to folks who 6311 want to recompile things and a data piece useful to anyone who can 6312 run "zic". 6313 6314 The new version has a few changes to the data files, a few 6315 portability changes, and an off-by-one fix (with thanks to 6316 Tom Karzes at deshaw.com for providing a description and a 6317 solution). 6318 6319 6320 Release 92c - 1992-11-21 17:35:36 -0000 6321 [tz92c.tar.Z is missing!] 6322 6323 The fallout from the latest round of DST transitions. 6324 6325 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6326 there's also a change to "zic.c" that makes it portable to more systems. 6327 6328 6329 Release 92 - 1992-04-25 18:17:03 -0000 6330 [tz92.tar.Z is missing!] 6331 6332 By popular demand (well, at any rate, following a request by kre at munnari) 6333 6334 6335 The 1989 update of the time zone package featured: 6336 6337 * POSIXization (including interpretation of POSIX-style TZ environment 6338 variables, provided by Guy Harris), 6339 * ANSIfication (including versions of "mktime" and "difftime"), 6340 * SVIDulation (an "altzone" variable) 6341 * MACHination (the "gtime" function) 6342 * corrections to some time zone data (including corrections to the rules 6343 for Great Britain and New Zealand) 6344 * reference data from the United States Naval Observatory for folks who 6345 want to do additional time zones 6346 * and the 1989 data for Saudi Arabia. 6347 6348 (Since this code will be treated as "part of the implementation" in some 6349 places and as "part of the application" in others, there's no good way to 6350 name functions, such as timegm, that are not part of the proposed ANSI C 6351 standard; such functions have kept their old, underscore-free names in this 6352 update.) 6353 6354 And the "dysize" function has disappeared; it was present to allow 6355 compilation of the "date" command on old BSD systems, and a version of "date" 6356 is now provided in the package. The "date" command is not created when you 6357 "make all" since it may lack options provided by the version distributed with 6358 your operating system, or may not interact with the system in the same way 6359 the native version does. 6360 6361 Since POSIX frowns on correct leap second handling, the default behavior of 6362 the "zic" command (in the absence of a "-L" option) has been changed to omit 6363 leap second information from its output files. 6364 6365 6366 ----- 6367 Notes 6368 6369 This file contains copies of the part of each release announcement 6370 that talks about the changes in that release. The text has been 6371 adapted and reformatted for the purposes of this file. 6372 6373 Traditionally a release R consists of a pair of tarball files, 6374 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6375 code2010a, data2012c) consist of just one or the other tarball, and a 6376 few (e.g., code2012c-data2012d) have tarballs with mixed version 6377 numbers. Recent releases also come in an experimental format 6378 consisting of a single tarball tzdb-R.tar.lz with extra data. 6379 6380 Release timestamps are taken from the release's commit (for newer, 6381 Git-based releases), from the newest file in the tarball (for older 6382 releases, where this info is available) or from the email announcing 6383 the release (if all else fails; these are marked with a time zone 6384 abbreviation of -0000 and an "is missing!" comment). 6385 6386 Earlier versions of the code and data were not announced on the tz 6387 list and are not summarized here. 6388 6389 This file is in the public domain. 6390 6391 Local Variables: 6392 coding: utf-8 6393 End: 6394
Indexes created Tue Sep 30 11:09:46 GMT 2025