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Diffstat (limited to 'tz/theory.html')
| -rw-r--r-- | tz/theory.html | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/tz/theory.html b/tz/theory.html index 28cc88e..2b14c51 100644 --- a/tz/theory.html +++ b/tz/theory.html @@ -376,9 +376,11 @@ The source file <code>etcetera</code> defines names that may be useful on platforms that do not support POSIX-style <code>TZ</code> strings; no other source file other than <code>backward</code> contains links to its zones. -One of <code>etcetera</code>'s names is <code>GMT</code>, +One of <code>etcetera</code>'s names is <code>Etc/UTC</code>, used by functions like <code>gmtime</code> to obtain leap second information on platforms that support leap seconds. +Another <code>etcetera</code> name, <code>GMT</code>, +is used by older code releases. </p> </section> @@ -468,6 +470,7 @@ in decreasing order of importance: PST/PDT Philippine, SAST South Africa, SST Samoa, + UTC Universal, WAT/WAST West Africa, WET/WEST/WEMT Western European, WIB Waktu Indonesia Barat, @@ -502,7 +505,7 @@ in decreasing order of importance: HMT Havana, Helsinki, Horta, Howrah; IMT Irkutsk, Istanbul; JMT Jerusalem; - KMT Kaunas, Kiev, Kingston; + KMT Kaunas, Kyiv, Kingston; LMT Lima, Lisbon, local, Luanda; MMT Macassar, Madras, MalĂ©, Managua, Minsk, Monrovia, Montevideo, Moratuwa, Moscow; @@ -720,8 +723,8 @@ href="https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vanes than what the <code><abbr>tz</abbr></code> code can handle. For example, from 1880 to 1916 clocks in Ireland observed Dublin Mean Time (estimated to be <abbr>UT</abbr> - −00:25:21.1), but the <code><abbr>tz</abbr></code> - code cannot represent the fractional second. + −00:25:21.1); although the <code><abbr>tz</abbr></code> + source data can represent the .1 second, TZif files and the code cannot. In practice these old specifications were rarely if ever implemented to subsecond precision. </li> @@ -1295,7 +1298,8 @@ Because a leap second adjustment may be needed even if no time zone correction is desired, calls to <code>gmtime</code>-like functions also need to consult a <abbr>TZif</abbr> file, -conventionally named <samp><abbr>GMT</abbr></samp>, +conventionally named <samp><abbr>Etc/UTC</abbr></samp> +(<samp><abbr>GMT</abbr></samp> in previous versions), to see whether leap second corrections are needed. To convert an application's <code>time_t</code> timestamps to or from POSIX <code>time_t</code> timestamps (for use when, say, |