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Western Australia time zone January 1, 2019
by Paul Eggert April 2, 2018

April 2, 2018

Today the Guardian Express of Perth reported that the government of Western Australia has decided to advance the clocks permanently from +0800 to +0900 on January 1, 2019. Presumably the time will still be called Australian Western Standard Time (AWST), as it will still differ by 30 minutes from ACST (+0930). For now, I suppose we should guess that Australia/Eucla will simultaneously switch from +0845 to +0915 so as to stay halfway between AWST and ACST. Proposed patch attached. The article concludes that the government has made several concessions to residents opposed to the measure, and lists some of them. One is that "people over the age of 60 concerned about colour bleaching from drapes and blinds can apply in writing to have the extra hour of sunshine removed from their area." See: Daylight saving coming to WA in 2019. Guardian Express. 2018-04-01. https://www.communitynews.com.au/guardian-express/news/exclusive-daylight-s…

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US marks centennial of daylight saving
by Paul Eggert March 30, 2018

March 30, 2018

Tonight marks 100 years since the introduction of daylight saving time as United States federal law. On March 30/31, 1918, New York City held a New-Year's-style celebration for the public in Madison Square Garden, along with a reception at the Aldine Club for the elite. The guest of honor was Marcus M. Marks, president of the Daylight Saving Association, and uncle of the now-more-famous Johnny Marks (who was later to write "Rudolph the Red-Nosed Reindeer"). Among other things, Marks got to push the button that advanced the 8-meter clocks atop what is now known as the Met Life Tower. See: Change in time begins tomorrow. Government's new daylight regulation goes into effect at 2 A. M. No confusion expected. New York Times. 1918-03-30. https://www.nytimes.com/packages/html/mobile/change-in-time.pdf

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[PROPOSED] * tz-link.html: Add worldclock.com.
by Paul Eggert March 26, 2018

March 26, 2018

--- tz-link.html | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tz-link.html b/tz-link.html index 7221777..6700c7f 100644 --- a/tz-link.html +++ b/tz-link.html @@ -239,8 +239,9 @@ These are listed roughly in ascending order of complexity and fanciness. <ul> <li><a href="https://time.is">Time.is</a> shows locations' time and zones.</li> -<li><a href="https://www.timejones.com">TimeJones.com</a> -and <a href="https://timezoneconverterapp.com">Time Zone Converter</a> +<li><a href="https://www.timejones.com">TimeJones.com</a>, +<a href="https://timezoneconverterapp.com">Time Zone Converter</a> and +<a href="http://worldclock.com">The World Clock</a> are time zone converters.</li> <li><a href="http://twiki.org/cgi-bin/xtra/tzdatepick.html">Date and Time Gateway</a> -- 2.7.4

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Re: [tz] [PATCH1/1] Propose new zone for Crozet Islands
by REMI ACIEN March 25, 2018

March 25, 2018

Provenance : Courrier<https://go.microsoft.com/fwlink/?LinkId=550986> pour Windows 10 A new zone for Crozet Islands . Why not .

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[PROPOSED] Spelling fixes
by Paul Eggert March 23, 2018

March 23, 2018

--- NEWS | 2 +- asia | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 8afe3a4..0297fd8 100644 --- a/NEWS +++ b/NEWS @@ -39,7 +39,7 @@ Release 2018d - 2018-03-22 07:05:46 -0700 Enderbury and Kiritimati skipped New Year's Eve 1994, not New Year's Day 1995. (Thanks to Kerry Shetline.) - Fix the 1912-01-01 transition for Portugual and its colonies. + Fix the 1912-01-01 transition for Portugal and its colonies. This transition was at 00:00 according to the new UT offset, not according to the old one. Also assume that Cape Verde switched on the same date as the rest, not in 1907. This affects diff --git a/asia b/asia index 998a7d4..7a6294a 100644 --- a/asia +++ b/asia @@ -2658,7 +2658,7 @@ Zone Asia/Karachi 4:28:12 - LMT 1907 # From Sharef Mustafa (2018-03-16): # Palestine summer time will start on Mar 24th 2018 by advancing the # clock by 60 minutes as per Palestinian cabinet decision published on -# the offical website, though the decree did not specify the exact +# the official website, though the decree did not specify the exact # time of the time shift. # http://www.palestinecabinet.gov.ps/Website/AR/NDecrees/ViewFile.ashx?ID=e7a… # -- 2.14.3

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[tz-announce] 2018d release of tz code and data available
by Paul Eggert March 23, 2018

March 23, 2018

The 2018d release of the tz code and data is available. It reflects the following changes, which were either circulated on the tz mailing list or are relatively minor technical or administrative changes: Briefly: Palestine starts DST a week earlier in 2018. Add support for vanguard and rearguard data consumers. Add subsecond precision to source data format, though not to data. Changes to future time stamps In 2018, Palestine starts DST on March 24, not March 31. Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) Changes to past and future time stamps Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 at 04:00. (Thanks to Steffen Thorsen.) Changes to past time stamps Historical transitions for Uruguay, represented by America/Montevideo, have been updated per official legal documents, replacing previous data mainly originating from the inventions of Shanks & Pottenger. This has resulted in adjustments ranging from 30 to 90 minutes in either direction over at least two dozen distinct periods ranging from one day to several years in length. A mere handful of pre-1991 transitions are unaffected; data since then has come from more reliable contemporaneous reporting. These changes affect various timestamps in 1920-1923, 1936, 1939, 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. Additionally, Uruguay's pre-standard-time UT offset has been adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to match the location of the Observatory of the National Meteorological Institute in Montevideo. (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) Enderbury and Kiritimati skipped New Year's Eve 1994, not New Year's Day 1995. (Thanks to Kerry Shetline.) Fix the 1912-01-01 transition for Portugual and its colonies. This transition was at 00:00 according to the new UT offset, not according to the old one. Also assume that Cape Verde switched on the same date as the rest, not in 1907. This affects Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. (Thanks to Michael Deckers.) Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in Turks & Caicos. Changes to past time zone abbreviations MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There is no clock change associated with the transition. Changes to build procedure The new DATAFORM macro in the Makefile lets the installer choose among three source data formats. The idea is to lessen downstream disruption when data formats are improved. * DATAFORM=vanguard installs from the latest, bleeding-edge format. DATAFORM=main (the default) installs from the format used in the 'africa' etc. files. DATAFORM=rearguard installs from a trailing-edge format. Eventually, elements of today's vanguard format should move to the main format, and similarly the main format's features should eventually move to the rearguard format. * In the current version, the main and rearguard formats are identical and match that of 2018c, so this change does not affect default behavior. The vanguard format currently contains one feature not in the main format: negative SAVE values. This improves support for Ireland, which uses Irish Standard Time (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has supported negative SAVE values for decades, and this feature should move to the main format soon. However, it will not move to the rearguard format for quite some time because some downstream parsers do not support it. * The build procedure constructs three files vanguard.zi, main.zi, and rearguard.zi, one for each format. The files represent the same data as closely as the formats allow. These three files are intended for downstream data consumers and are not installed. Zoneinfo parsers that do not support negative SAVE values should start using rearguard.zi, so that they will be unaffected when the negative-DST feature moves from vanguard to main. Bleeding-edge Zoneinfo parsers that support the new features already can use vanguard.zi; in this respect, current tzcode is bleeding-edge. The Makefile should now be safe for parallelized builds, and 'make -j to2050new.tzs' is now much faster on a multiprocessor host with GNU Make. When built with -DSUPPRESS_TZDIR, the tzcode library no longer prepends TZDIR/ to file names that do not begin with '/'. This is not recommended for general use, due to its security implications. (From a suggestion by Manuela Friedrich.) Changes to code zic now accepts subsecond precision in expressions like 00:19:32.13, which is approximately the legal time of the Netherlands from 1835 to 1937. However, because it is questionable whether the few recorded uses of non-integer offsets had subsecond precision in practice, there are no plans for tzdata to use this feature. (Thanks to Steve Allen for pointing out the limitations of historical data in this area.) The code is a bit more portable to MS-Windows. Installers can compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that reserve identifiers like 'localtime'. (Thanks to Manuela Friedrich). Changes to documentation and commentary theory.html now outlines tzdb's extensions to POSIX's model for civil time, and has a section "POSIX features no longer needed" that lists POSIX API components that are now vestigial. (From suggestions by Steve Summit.) It also better distinguishes time zones from tz regions. (From a suggestion by Guy Harris.) Commentary is now more consistent about using the phrase "daylight saving time", to match the C name tm_isdst. Daylight saving time need not occur in summer, and need not have a positive offset from standard time. Commentary about historical transitions in Uruguay has been expanded with links to many relevant legal documents. (Thanks to Tim Parenti.) Commentary now uses some non-ASCII characters with Unicode value less than U+0100, as they can be useful and should work even with older editors such as XEmacs. Here are links to the release files: https://www.iana.org/time-zones/repository/releases/tzcode2018d.tar.gz https://www.iana.org/time-zones/repository/releases/tzdata2018d.tar.gz https://www.iana.org/time-zones/repository/releases/tzdb-2018d.tar.lz As usual, links to the latest release files are here: https://www.iana.org/time-zones/repository/tzcode-latest.tar.gz https://www.iana.org/time-zones/repository/tzdata-latest.tar.gz https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz Links are also available via plain HTTP, and via FTP from ftp://ftp.iana.org/tz/releases with the same basenames as above. Each release file has a GPG signature, which can be retrieved by appending ".asc" to the above URLs. Copies of these signatures are appended to this message. This release corresponds to commit bd850bce5d292caaa5eba2c2088f6d4ad8024647 dated 2018-03-22 07:05:46 -0700 and tagged '2018d' in the development GitHub repository at <https://github.com/eggert/tz>. Here are the SHA-512 checksums for the release files: e79a95e235cd384247e4112d5154f30eb7b40f28dab4872ed9153e45bf56569949d0845bc1b9ad24b7a5f9609bdadfc892959dbf0d540dbca79b18398dc4f930 tzcode2018d.tar.gz ee961aedc34e134172523a29fb8a9358f42649d06ffcd2d8a6ad86eeb174a80af5bfc4637e9e52ecdc51fa3d01afef9fff660a69ed72904ff747a59b5634830b tzdata2018d.tar.gz 12c839846c147b83ace915e399fe447f93e83b500327fb4549b6039615f548d7167594168b5c4779ee1f33d7a1b8c2e294aa13cd35823d778617065ad9ad8ea5 tzdb-2018d.tar.lz Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJas7pNAAoJEO2X6Q5iqn40dn8P+gI1f6sWKcA8iuDkRWundwBk Y92iYPChJDbgUSiWw3o+qyFmVUz0P1PZkB3rCTFhtyY8u6zCiO4+6xADyS+le3II iwwIg2yCqPxBXDXYkcFvSrXDuOo1hG009L1k9nKmv6RvO7lvr/o0K/pRQTWKiV2w jS9gPZeZ/ggTdcyaD9tzFNwDe0nCg54rwFs3Gy+YK2+8fNhLmYJCp3WJydza9zgU pBMMP868h1ZY9uWEZcWX3mstyKD4egFRfyHMj4XPVrnGwpMT5u7groiq2TZv/MXV A/HDxa4jU+El6RW0TwAVnGEwUSJ3L3I7B6/Pbf3jf+VCTYkw67cX/WrtSNop1E03 ujPZVqYr5N8HLu/VO/R2R+OccvMZ1X/URehA4068w/+ESG8X8AbRVBYGavpFmnUv uHOeOFgzcJUQqFU1fqAEdhlrYqqbnsRFJN8QX1QWwQs5fUAzNSAkAB+kTEVCAvhK 1xaxlNaZqoWqT0bYvD2TL+VLkPNHvu8RMpa/rhmjE23AWfYuSJsAABNMBpB5t6ux SbBOBeJ+a5a1rZwya0hxeX6A3BCBPXKBjnt8MjBnV1s8Ns4Ng7jQ5ZqOXtlSo4ER fYHbVQITXnE+DbuM1zF6RY1dwmCLvkxpdM5lifgiYCdcDzttsifDdrq5WM+pJsz5 3yTFJFsk6et2ekpHRugZ =MMy8 -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJas7pNAAoJEO2X6Q5iqn40BqwP/A8PU9mzxssBdQirWsuGhN3E +3hk6i7UFLrCHixbpN03y7r8ujkhRvkjLSrA2tcrYEK9t8NLkhQIrnmlVjEOQEcz +qiZWJV55kd2dhk2EE+pc8xXuqRsnId4r/xCF+D2wxl6IZpMEFelRCRiCGgszhDS FSv3UjlnpBv3uB5UgKdOFJKYcTvfOZ5jmpt1O6Ma9YNxqlc2+s8hUBR3VEtzancU +AyCoL/sUrijfGOZPSznhGJJ3lC5LkjkWqC0BYB5EI3YeClVtGWoZlD64jShJhWT pe3CAimaEibz1ty1tGz4Agdd0vQErvyCPQY6wy1pRYPW5wb++JomMVub7Uh7w/6o pvrkVaVqeiWeENoI6NRnmC+ANSaz6/lF61HM36VZ1XaCgmeCDaLHn31WKHRPctse r26++PyCIJwllaTNfGynjkAKUeBJJwwR8a/sjPeqEfEgoDKV1EpQVCBbPna3hmTq 8nzt11WsTNG+aocYr3hevSYiyxEWOLp5O9UaiTtVDc91Mhk2U9E9Fa7Zva35ZhjJ oRPS+AU5GFfWzgiW8XOLURqvwRNqUUudNaXy2wVuzwROdmboyewzB//MBavkI+r+ raI+coG2ZJoPcQmuRCUcjs1+JnNBL3sZT68/jTy2w0LURfUP9V+dUuJgjtRbMCtb Myzq3RCYNI/x3EjU/xcb =ibli -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJas7pOAAoJEO2X6Q5iqn40ursP/02PBDqd4eb8qrKrjScYt+I4 wnXMcjy9AmsfhPq1k1x6ZUI5qIbidrMD9S9m4NwKBGyvGxxcneWWJ5Yoln+K95YJ tCtm40eHypeVUlsXJExv3JB0hJ7d7eY2olbY/DcK6CTYt7R4amGU/ClCQpEIVTz2 HcVeH8oOPRUG0STyzKh2lPF0Wua6LUGp9/nZWgsETsXrAQ8MaC/vlyrjiEJsvwP1 65bOoNiRKiGU7tp6JhFE8v85vLKgkzmHeysWJdMt0aczH1DMwlSWS9ViEauLugK7 K0ERNC22WwEzya0EKmTMcRFHYIT1B9/dg0Tbb2h2KKRqu7kzd2NVr6ap5Cu6ezYO hThz6i09OL6ADSwSk4c6JeUUjX7rGG6DNu0pCQYlNJ9xIhi+U/FAuTvzBfU3uJe3 8akO1UGwUWA/TwtnQTv08uGGia+Wt/GbQStkidZFVvdbXcjSH39GlhRXRWDKSOCv wDVNMkopDQOsxwoFgAE45dacQZh2Qv29eT4pG6Eo2J+eXJR2lb5edQkDZNLk2DcE 6frcVchrdBeaUUSA1+ssH3B+hVwwJ7IX/FCwhKDZgxyy67oqGVChkeUjes4GJ5vB 0t7/XZTORvsH6XwBNDKoXS0fswtZiwhPr3YV1nZHwKCa0OWIs9WsPt587K82Hlsf mROMmzivSut43pdALRCr =zKoc -----END PGP SIGNATURE----- _______________________________________________ tz-announce mailing list tz-announce(a)iana.org https://mm.icann.org/mailman/listinfo/tz-announce

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[PROPOSED] * tz-link.html: Tweak URLs.
by Paul Eggert March 22, 2018

March 22, 2018

--- tz-link.html | 56 +++++++++++++++++++++++++++----------------------------- 1 file changed, 27 insertions(+), 29 deletions(-) diff --git a/tz-link.html b/tz-link.html index f3ac4ed..7221777 100644 --- a/tz-link.html +++ b/tz-link.html @@ -7,7 +7,9 @@ <body> <h1>Sources for time zone and daylight saving time data</h1> <p> -Time zone and daylight saving rules are controlled by individual +<a href="https://en.wikipedia.org/wiki/Time_zone">Time zone</a> and +<a href="https://en.wikipedia.org/wiki/Daylight_saving_time">daylight-saving</a> +rules are controlled by individual governments. They are sometimes changed with little notice, and their histories and planned futures are often recorded only fitfully. Here is a summary of attempts to organize and record relevant data in this @@ -20,12 +22,9 @@ time zone database contains code and data that represent the history of local time for many representative locations around the globe. It is updated periodically to reflect changes made by political bodies -to <a href="https://en.wikipedia.org/wiki/Time_zone">time zone</a> -boundaries and -<a href="https://en.wikipedia.org/wiki/Daylight_saving_time">daylight-saving</a> -rules. -This database (often called <code>zoneinfo</code> or -<code><abbr>tz</abbr></code>) +to time zone boundaries and daylight saving rules. +This database (known as <code><abbr>tz</abbr></code>, +<code><abbr>tzdb</abbr></code>, or <code>zoneinfo</code>) is used by several implementations, including <a href="https://www.gnu.org/software/libc/">the @@ -109,7 +108,7 @@ gzip -dc tzdata-latest.tar.gz | tar -xf - release in a single-tarball format containing extra data useful for regression testing:</p> <pre style="margin-left: 2em"><code>wget <a href="https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz">https://www.iana.org/time-zones/repository/tzdb-latest.tar.lz</a> -<a href="http://www.nongnu.org/lzip/">lzip</a> -dc tzdb-latest.tar.lz | tar -xf - +<a href="https://www.nongnu.org/lzip/">lzip</a> -dc tzdb-latest.tar.lz | tar -xf - </code></pre> <p>These commands use convenience links to the latest release of the <code><abbr>tz</abbr></code> database hosted by the @@ -130,7 +129,7 @@ Since version 2016h, each release has contained a text file named The releases are also available in an <a href="ftp://ftp.iana.org/tz/releases/"><abbr title="File Transfer Protocol">FTP</abbr> directory</a> via a -less-secure protocol .</p> +less-secure protocol.</p> <p>Alternatively, a development repository of code and data can be retrieved from <a href="https://github.com">GitHub</a> via the shell command:</p> @@ -192,7 +191,7 @@ href="http://www.oracle.com/technetwork/java/javase/tzupdater-readme-136440.html Java, <a href="http://www.joda.org/joda-time/tz_update.html">Joda-Time</a>, <a href="https://dev.mysql.com/doc/refman/en/time-zone-support.html">MySQL</a>, and <a -href="http://nodatime.org/userguide/tzdb">Noda Time</a> (see below). +href="https://nodatime.org/userguide/tzdb">Noda Time</a> (see below). </p> <p>Sources for the <code><abbr>tz</abbr></code> database are <a href="https://en.wikipedia.org/wiki/UTF-8"><abbr @@ -203,7 +202,7 @@ title="linefeed">LF</abbr></a>, which can be modified by common text editors such as <a href="https://www.gnu.org/software/emacs/">GNU Emacs</a>, <a href="https://wiki.gnome.org/Apps/Gedit">gedit</a>, and -<a href="http://www.vim.org">vim</a>. +<a href="https://www.vim.org">vim</a>. Specialized source-file editing can be done via the <a href="https://packagecontrol.io/packages/zoneinfo">Sublime zoneinfo</a> package for <a @@ -258,7 +257,7 @@ timezone information for all countries</a> displays tables of DST rules. Worldwide</a> lets you sort zone names and convert times.</li> <li><a href="https://24timezones.com">24TimeZones</a> has a world time map and a time converter.</li> -<li><a href="http://www.zeitverschiebung.net/en/">Time Difference</a> +<li><a href="https://www.zeitverschiebung.net/en/">Time Difference</a> calculates the current time difference between locations.</li> <li><a href="http://www.wx-now.com">Weather Now</a> and <a href="http://www.thetimenow.com">The Time Now</a> list the weather too.</li> @@ -290,7 +289,7 @@ variant <a href="https://tools.ietf.org/html/rfc6321">xCal</a> title="Extensible Markup Language">XML</abbr></a> format, and a variant <a href="https://tools.ietf.org/html/rfc7265">jCal</a> (Internet <abbr>RFC</abbr> 7265) -uses <a href="http://www.json.org"><abbr +uses <a href="https://www.json.org"><abbr title="JavaScript Object Notation">JSON</abbr></a> format.</li> </ul> <h2 id="compilers">Other <code><abbr>tz</abbr></code> compilers</h2> @@ -374,7 +373,7 @@ License">LGPL</abbr>)</a>.</li> <li><abbr>ICU</abbr> (mentioned <a href="#ICU">above</a>) contains compilers and Java-based libraries.</li> </ul> -<li><a href="http://nodatime.org">Noda Time – Date and +<li><a href="https://nodatime.org">Noda Time – Date and time <abbr>API</abbr> for .NET</a> and <a href="http://www.babiej.demon.nl/Tz4Net/main.htm">TZ4Net</a> are similar to Joda-Time and Time4J, but for the .NET framework instead of @@ -458,7 +457,7 @@ library that reads tz binary files and converts time stamps from one time zone or format to another. It is used by <a href="https://secure.php.net"><abbr title="PHP: Hypertext Preprocessor">PHP</abbr></a>, -<a href="http://hhvm.com"><abbr title="HipHop Virtual Machine">HHVM</abbr></a>, +<a href="https://hhvm.com"><abbr title="HipHop Virtual Machine">HHVM</abbr></a>, and <a href="https://www.mongodb.com">MongoDB</a>. It is freely available under the <abbr>MIT</abbr> license.</li> <li><a href="https://github.com/bigeasy/timezone">Timezone</a> is a @@ -518,7 +517,7 @@ the older, proprietary method of Microsoft Windows 2000 and later, which stores time zone data in the <a href="https://en.wikipedia.org/wiki/Windows_Registry">Windows Registry</a>. The <a -href="http://unicode.org/cldr/charts/latest/supplemental/zone_tzid.html">Zone → +href="https://unicode.org/cldr/charts/latest/supplemental/zone_tzid.html">Zone → Tzid table</a> or <a href="https://unicode.org/repos/cldr/trunk/common/supplemental/windowsZones.xml"><abbr>XML</abbr> file</a> of the <abbr>CLDR</abbr> data maps proprietary zone IDs @@ -528,7 +527,7 @@ href="https://www.oracle.com/java/index.html">Oracle Java</a> contains a copy of a subset of a recent <code><abbr>tz</abbr></code> database in a Java-specific format.</li> -<li><a href="http://www.relativedata.com/time-zone-master">Time Zone +<li><a href="https://www.relativedata.com/time-zone-master">Time Zone Master</a> is a Microsoft Windows clock program that can automatically download, compile and use <code>tz</code> releases. The Basic version is free.</li> @@ -543,8 +542,8 @@ licenses</a> to <code><abbr>tz</abbr></code> contributors.</li> <li><a href="https://www.astro.com/atlas">Time-zone Atlas</a> is Astrodienst's Web version of Shanks and Pottenger's time zone history atlases also published in <a -href="http://astrocom.com/astrology-products/software/acs-atlas-software">software</a> -form by <a href="http://astrocom.com">ACS-Starcrafts</a>. +href="https://astrocom.com/astrology-products/software/acs-atlas-software">software</a> +form by <a href="https://astrocom.com">ACS-Starcrafts</a>. These atlases are extensive but unreliable, as Shanks appears to have guessed many <abbr>UT</abbr> offsets and transitions. The atlases cite no sources and do not indicate which entries are guesswork.</li> @@ -552,7 +551,7 @@ sources and do not indicate which entries are guesswork.</li> its own <code>tztab</code>(4) format.</li> <li>Microsoft Windows has proprietary data mentioned <a href="#System.TimeZoneInfo">above</a>.</li> -<li><a href="http://www.worldtimeserver.com">World Time Server</a> +<li><a href="https://www.worldtimeserver.com">World Time Server</a> is another time zone database.</li> <li><a href="http://tycho.usno.navy.mil/tzones.html">World Time Zones</a> contains data from the Time Service Department of the @@ -578,14 +577,14 @@ recent editions. The pictorial quality is good, but the maps do not indicate daylight saving time, and parts of the data are a few years out of date.</li> -<li><a href="http://www.worldtimezone.com">Current time around the world +<li><a href="https://www.worldtimezone.com">Current time around the world and standard time zones map of the world</a> has several fancy time zone maps; it covers Russia particularly well. The maps' pictorial quality is not quite as good as the <abbr>CIA</abbr>'s but the maps are more up to date.</li> <li><a -href="http://blog.poormansmath.net/how-much-is-time-wrong-around-the-world/">How +href="https://blog.poormansmath.net/how-much-is-time-wrong-around-the-world/">How much is time wrong around the world?</a> maps the difference between mean solar and standard time, highlighting areas such as western China where the two differ greatly. It's a bit out of date, unfortunately.</li> @@ -666,9 +665,8 @@ political subdivision data related to time zones.</li> <li><a href="http://home.kpn.nl/vanadovv/time/Multizones.html">Time zone boundaries for multizone countries</a> summarizes legal boundaries between time zones within countries.</li> -<li>Manifold.net's <a -href="http://manifold.net/info/freestuff.shtml">Free Downloads for -Manifold System Users</a> includes a Manifold-format map of +<li><a href="http://manifold.net/info/freestuff.shtml">Manifold Software +– GIS and Database Tools</a> includes a Manifold-format map of world time zone boundaries distributed under the <abbr>GPL</abbr>.</li> <li>A ship within the <a @@ -808,12 +806,12 @@ href="https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol"><abbr>D option for a server to configure a client's time zone and daylight saving settings automatically.</li> <li><a -href="http://www.cv.nrao.edu/~rfisher/Ephemerides/times.html">Astronomical +href="https://www.cv.nrao.edu/~rfisher/Ephemerides/times.html">Astronomical Times</a> explains more abstruse astronomical time scales like <abbr title="Terrestrial Dynamic Time">TDT</abbr>, <abbr title="Geocentric Coordinate Time">TCG</abbr>, and <abbr title="Barycentric Dynamic Time">TDB</abbr>. -<a href="http://www.ucolick.org/~sla/leapsecs/timescales.html">Time +<a href="https://www.ucolick.org/~sla/leapsecs/timescales.html">Time Scales</a> goes into more detail, particularly for historical variants.</li> <li>The <a href="https://www.iau.org"><abbr title="International Astronomical Union">IAU</abbr></a>'s <a @@ -859,7 +857,7 @@ and Klepczynski's 1999 proposal to discontinue leap seconds</a>, discussed further in <a href="https://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf">The leap second: its history and possible future</a>. -<a href="http://www.ucolick.org/~sla/leapsecs/"><abbr>UTC</abbr> +<a href="https://www.ucolick.org/~sla/leapsecs/"><abbr>UTC</abbr> might be redefined without Leap Seconds</a> gives pointers on this contentious issue, which was active until 2015 and could become active @@ -873,7 +871,7 @@ zone names, abbreviations, identifiers, and formats. For example, it contains French translations for "Eastern European Summer Time", "<abbr title="Eastern European Summer Time">EEST</abbr>", and "Bucharest". Its -<a href="http://unicode.org/cldr/charts/latest/by_type/">by-type +<a href="https://unicode.org/cldr/charts/latest/by_type/">by-type charts</a> show these values for many locales. Data values are available in both <abbr title="Locale Data Markup Language">LDML</abbr> (an <abbr>XML</abbr> format) and <abbr>JSON</abbr>. -- 2.7.4

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Re: [tz] proposed tz data changes for Iran, Sri Lanka, Alberta, Thule, etc.
by REMI ACIEN March 21, 2018

March 21, 2018

Provenance : Courrier<https://go.microsoft.com/fwlink/?LinkId=550986> pour Windows 10 For Zone Asia/Seoul +8 :27 :52 . Why not .

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[PROPOSED] Put ziguard.awk in tzdata and tzdb tarballs
by Paul Eggert March 20, 2018

March 20, 2018

(Problem reported by Patsy Franklin.) * Makefile (AWK_SCRIPTS): Add ziguard.awk. --- Makefile | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 3c0479a..c69e01b 100644 --- a/Makefile +++ b/Makefile @@ -486,7 +486,8 @@ TZDATA_ZI_DEPS= ziguard.awk zishrink.awk version $(TDATA) $(PACKRATDATA) DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA) DATA= $(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \ leapseconds yearistype.sh $(ZONETABLES) -AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk zishrink.awk +AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk \ + ziguard.awk zishrink.awk MISC= $(AWK_SCRIPTS) zoneinfo2tdf.pl TZS_YEAR= 2050 TZS= to$(TZS_YEAR).tzs @@ -903,6 +904,9 @@ tarballs traditional_tarballs signatures traditional_signatures: version VERSION=`cat version` && \ $(MAKE) VERSION="$$VERSION" $@_version +# These *_version rules are intended for use if VERSION is set by some +# other means. Ordinarily these rules are used only by the above +# non-_version rules, which set VERSION on the 'make' command line. tarballs_version: traditional_tarballs_version tzdb-$(VERSION).tar.lz traditional_tarballs_version: \ tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz -- 2.14.3

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switches at 1883-11-18 at the same instant
by Michael H Deckers March 20, 2018

March 20, 2018

On 2018-03-19 09:18, Glenn A. Walsh wrote in a post to a different mailing list: > Centennial: Official Enactment of U.S. Time Zones & Daylight Saving Time > A century ago today (March 19), U.S.President Woodrow Wilson signed into law the Standard Time Act of1918, which officially established time zones in the United States aswell as Daylight Saving Time. Although time zones had beenunofficially observed for a few decades. > MORE INFO - CLICK ON IMAGE OR LINK --- LIKE THIS POST? - PLEASE SHARE! > Link >>> http://spacewatchtower.blogspot.com/2018/03/centennial-official-enactment-o… > The link describes (among many other things) how the Allegheny Observatory synchronized the switch of US railway times to grid time zones. As one would expect, the switch was done at a single instant, when UT was 1883-11-18 + 18 h. This differs from the current description in tzdb which uses different instants for different target time zones -- not a likely choice for simplifying a nationwide railway schedule. Thus I propose: - Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 12:07:02 + Zone America/Los_Angeles -7:52:58 - LMT 1883 Nov 18 10:07:02 - Zone America/Boise -7:44:49 - LMT 1883 Nov 18 12:15:11 + Zone America/Boise -7:44:49 - LMT 1883 Nov 18 10:15:11 - Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 11:31:42 + Zone America/Phoenix -7:28:18 - LMT 1883 Nov 18 10:31:42 - Zone America/Denver -6:59:56 - LMT 1883 Nov 18 12:00:04 + Zone America/Denver -6:59:56 - LMT 1883 Nov 18 11:00:04 - Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 12:12:53 + Zone America/North_Dakota/Beulah -6:47:07 - LMT 1883 Nov 18 11:12:53 - Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 12:14:21 + Zone America/North_Dakota/New_Salem -6:45:39 - LMT 1883 Nov 18 11:14:21 - Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 12:14:48 + Zone America/North_Dakota/Center -6:45:12 - LMT 1883 Nov 18 11:14:48 - Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 + Zone America/New_York -4:56:02 - LMT 1883 Nov 18 13:03:58 Michael Deckers.

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