Attachment 7206 Details for Bug 15968 – Document TZ transition times >= 25:00:00.

[patch] Document TZ transition times >= 25:00:00.

0003-Document-TZ-transition-times-25-00-00.patch (text/plain), 2.97 KB, created by Paul Eggert on 2013-09-18 20:25:22 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Paul Eggert

Created: 2013-09-18 20:25:22 UTC

Size: 2.97 KB

patch

obsolete

>From 944b3319fb712f0438986cc9920d3d8ac1dc183a Mon Sep 17 00:00:00 2001
>From: Paul Eggert <eggert@cs.ucla.edu>
>Date: Wed, 18 Sep 2013 13:01:11 -0700
>Subject: [PATCH 3/4] Document TZ transition times >= 25:00:00.
>
>* manual/time.texi (TZ Variable): Document transition times from
>25:00:00 through 167:59:59.  These are already supported, and this
>support will help with version-3 tz-format files.
>---
> ChangeLog        |  5 +++++
> manual/time.texi | 27 +++++++++++++++++++++++++--
> 2 files changed, 30 insertions(+), 2 deletions(-)
>
>diff --git a/ChangeLog b/ChangeLog
>index 35c936b..9b54d09 100644
>--- a/ChangeLog
>+++ b/ChangeLog
>@@ -1,5 +1,10 @@
> 2013-09-18  Paul Eggert  <eggert@cs.ucla.edu>
> 
>+	Document TZ transition times >= 25:00:00.
>+	* manual/time.texi (TZ Variable): Document transition times from
>+	25:00:00 through 167:59:59.  These are already supported, and this
>+	support will help with version-3 tz-format files.
>+
> 	* manual/time.texi (TZ Variable): Modernize North America example
> 	to reflect current (i.e., 2007-and-later) daylight saving rules.
> 
>diff --git a/manual/time.texi b/manual/time.texi
>index 162f309..4768156 100644
>--- a/manual/time.texi
>+++ b/manual/time.texi
>@@ -2082,9 +2082,11 @@ between @code{1} and @code{12}.
> 
> The @var{time} fields specify when, in the local time currently in
> effect, the change to the other time occurs.  If omitted, the default is
>-@code{02:00:00}.
>+@code{02:00:00}.  The hours part of the time fields can range from
>+0 through 167; this is an extension to POSIX.1, which allows
>+only the range 0 through 24.
> 
>-Here is an example @code{TZ} value, including the appropriate
>+Here are some example @code{TZ} values, including the appropriate
> Daylight Saving Time and its dates of applicability.  In North
> American Eastern Standard Time (EST) and Eastern Daylight Time (EDT),
> the normal offset from UTC is 5 hours; since this is
>@@ -2096,6 +2098,27 @@ at 2:00am.
> EST+5EDT,M3.2.0/2,M11.1.0/2
> @end smallexample
> 
>+Israel Standard Time (IST) and Israel Daylight Time (IDT) are 2 hours
>+ahead of the prime meridian in winter, springing forward an hour on
>+March's fourth Tuesday at 26:00 (i.e., 02:00 on the first Friday on or
>+after March 23), and falling back on October's last Sunday at 02:00.
>+
>+@smallexample
>+IST-2IDT,M3.4.4/26,M10.5.0
>+@end smallexample
>+
>+Western Argentina Summer Time (WARST) is 3 hours behind the prime
>+meridian all year.  There is a dummy fall-back transition on December
>+31 at 25:00 daylight saving time (i.e., 24:00 standard time,
>+equivalent to January 1 at 00:00 standard time), and a simultaneous
>+spring-forward transition on January 1 at 00:00 standard time, so
>+daylight saving time is in effect all year and the initial @code{WART}
>+is a placeholder.
>+
>+@smallexample
>+WART4WARST,J1/0,J365/25
>+@end smallexample
>+
> The schedule of Daylight Saving Time in any particular jurisdiction has
> changed over the years.  To be strictly correct, the conversion of dates
> and times in the past should be based on the schedule that was in effect
>-- 
>1.8.3.1
>

Actions: View | Diff

Attachments on bug 15968: 7204 | 7205 | 7206 | 7207