| NEWS (331662) | NEWS (333312) |
|---|---|
| 1News for the tz database 2 | 1News for the tz database 2 |
| 3Release 2018e - 2018-05-01 23:42:51 -0700 4 5 Briefly: 6 7 North Korea switches back to +09 on 2018-05-05. 8 The main format uses negative DST again, for Ireland etc. 9 'make tarballs' now also builds a rearguard tarball. 10 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 11 12 Changes to past and future time stamps 13 14 North Korea switches back from +0830 to +09 on 2018-05-05. 15 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 16 and Tim Parenti.) 17 18 Bring back the negative-DST changes of 2018a, except be more 19 compatible with data parsers that do not support negative DST. 20 Also, this now affects historical time stamps in Namibia and the 21 former Czechoslovakia, not just Ireland. The main format now uses 22 negative DST to model time stamps in Europe/Dublin (from 1971 on), 23 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 24 does not affect UT offsets, only time zone abbreviations and the 25 tm_isdst flag. Also, this does not affect rearguard or vanguard 26 formats; effectively the main format now uses vanguard instead of 27 rearguard format. Data parsers that do not support negative DST 28 can still use data from the rearguard tarball described below. 29 30 Changes to build procedure 31 32 The command 'make tarballs' now also builds the tarball 33 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 34 except that it uses rearguard format intended for trailing-edge 35 data parsers. 36 37 Changes to data format and to code 38 39 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 40 suffix, which specifies whether the adjusted time is standard time 41 or daylight saving time. If no suffix is given, daylight saving 42 time is used if and only if the SAVE column is nonzero; this is 43 the longstanding behavior. Although this new feature is not used 44 in tzdata, it could be used to specify the legal time in Namibia 45 1994-2017, as opposed to the popular time (see below). 46 47 Changes to past time stamps 48 49 From 1994 through 2017 Namibia observed DST in winter, not summer. 50 That is, it used negative DST, as Ireland still does. This change 51 does not affect UTC offsets; it affects only the tm_isdst flag and 52 the abbreviation used during summer, which is now CAT, not WAST. 53 Although (as noted by Michael Deckers) summer and winter time were 54 both simply called "standard time" in Namibian law, in common 55 practice winter time was considered to be DST (as noted by Stephen 56 Colebourne). The full effect of this change is only in vanguard 57 format; in rearguard and main format, the tm_isdst flag is still 58 zero in winter and nonzero in summer. 59 60 In 1946/7 Czechoslovakia also observed negative DST in winter. 61 The full effect of this change is only in vanguard format; in 62 rearguard and main formats, it is modeled as plain GMT without 63 daylight saving. Also, the dates of some 1944/5 DST transitions 64 in Czechoslovakia have been changed. 65 66 |
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| 3Release 2018d - 2018-03-22 07:05:46 -0700 4 5 Briefly: 6 7 Palestine starts DST a week earlier in 2018. 8 Add support for vanguard and rearguard data consumers. 9 Add subsecond precision to source data format, though not to data. 10 --- 23 unchanged lines hidden (view full) --- 34 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 35 match the location of the Observatory of the National Meteorological 36 Institute in Montevideo. 37 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 38 39 Enderbury and Kiritimati skipped New Year's Eve 1994, not 40 New Year's Day 1995. (Thanks to Kerry Shetline.) 41 | 67Release 2018d - 2018-03-22 07:05:46 -0700 68 69 Briefly: 70 71 Palestine starts DST a week earlier in 2018. 72 Add support for vanguard and rearguard data consumers. 73 Add subsecond precision to source data format, though not to data. 74 --- 23 unchanged lines hidden (view full) --- 98 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 99 match the location of the Observatory of the National Meteorological 100 Institute in Montevideo. 101 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 102 103 Enderbury and Kiritimati skipped New Year's Eve 1994, not 104 New Year's Day 1995. (Thanks to Kerry Shetline.) 105 |
| 42 Fix the 1912-01-01 transition for Portugual and its colonies. | 106 Fix the 1912-01-01 transition for Portugal and its colonies. |
| 43 This transition was at 00:00 according to the new UT offset, not 44 according to the old one. Also assume that Cape Verde switched on 45 the same date as the rest, not in 1907. This affects 46 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 47 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 48 (Thanks to Michael Deckers.) 49 50 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in --- 4350 unchanged lines hidden --- | 107 This transition was at 00:00 according to the new UT offset, not 108 according to the old one. Also assume that Cape Verde switched on 109 the same date as the rest, not in 1907. This affects 110 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 111 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 112 (Thanks to Michael Deckers.) 113 114 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in --- 4350 unchanged lines hidden --- |