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(-)a/ChangeLog (+5 lines)
Lines 1-5 Link Here
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2013-09-18  Paul Eggert  <eggert@cs.ucla.edu>
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2013-09-18  Paul Eggert  <eggert@cs.ucla.edu>
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	Document TZ transition times >= 25:00:00.
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	* manual/time.texi (TZ Variable): Document transition times from
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	25:00:00 through 167:59:59.  These are already supported, and this
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	support will help with version-3 tz-format files.
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	* manual/time.texi (TZ Variable): Modernize North America example
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	* manual/time.texi (TZ Variable): Modernize North America example
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	to reflect current (i.e., 2007-and-later) daylight saving rules.
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	to reflect current (i.e., 2007-and-later) daylight saving rules.
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(-)a/manual/time.texi (-3 / +25 lines)
Lines 2082-2090 between @code{1} and @code{12}. Link Here
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The @var{time} fields specify when, in the local time currently in
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The @var{time} fields specify when, in the local time currently in
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effect, the change to the other time occurs.  If omitted, the default is
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effect, the change to the other time occurs.  If omitted, the default is
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@code{02:00:00}.
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@code{02:00:00}.  The hours part of the time fields can range from
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0 through 167; this is an extension to POSIX.1, which allows
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only the range 0 through 24.
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Here is an example @code{TZ} value, including the appropriate
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Here are some example @code{TZ} values, including the appropriate
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Daylight Saving Time and its dates of applicability.  In North
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Daylight Saving Time and its dates of applicability.  In North
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American Eastern Standard Time (EST) and Eastern Daylight Time (EDT),
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American Eastern Standard Time (EST) and Eastern Daylight Time (EDT),
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the normal offset from UTC is 5 hours; since this is
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the normal offset from UTC is 5 hours; since this is
Lines 2096-2101 at 2:00am. Link Here
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EST+5EDT,M3.2.0/2,M11.1.0/2
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EST+5EDT,M3.2.0/2,M11.1.0/2
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@end smallexample
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@end smallexample
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Israel Standard Time (IST) and Israel Daylight Time (IDT) are 2 hours
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ahead of the prime meridian in winter, springing forward an hour on
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March's fourth Tuesday at 26:00 (i.e., 02:00 on the first Friday on or
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after March 23), and falling back on October's last Sunday at 02:00.
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@smallexample
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IST-2IDT,M3.4.4/26,M10.5.0
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@end smallexample
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Western Argentina Summer Time (WARST) is 3 hours behind the prime
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meridian all year.  There is a dummy fall-back transition on December
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31 at 25:00 daylight saving time (i.e., 24:00 standard time,
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equivalent to January 1 at 00:00 standard time), and a simultaneous
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spring-forward transition on January 1 at 00:00 standard time, so
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daylight saving time is in effect all year and the initial @code{WART}
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is a placeholder.
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@smallexample
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WART4WARST,J1/0,J365/25
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@end smallexample
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The schedule of Daylight Saving Time in any particular jurisdiction has
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The schedule of Daylight Saving Time in any particular jurisdiction has
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changed over the years.  To be strictly correct, the conversion of dates
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changed over the years.  To be strictly correct, the conversion of dates
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and times in the past should be based on the schedule that was in effect
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and times in the past should be based on the schedule that was in effect
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