[debbugs-tracker] bug#11281: closed (DST has not effect on windows XP when system DST adjustment is disabled)

[GNU bug Tracking System]

Your message dated Tue, 01 Jan 2002 06:00:52 +0530
with message-id <address@hidden>
and subject line Re: bug#11807: M-x display-time-world & EDT/DST
has caused the debbugs.gnu.org bug report #11807,
regarding DST has not effect on windows XP when system DST adjustment is 
disabled
to be marked as done.

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-- 
11807: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11807
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> --- Begin Message ---
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> Subject: 
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> DST has not effect on windows XP when system DST adjustment is	disabled
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> Date: 
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> Fri, 20 Apr 2012 00:35:40 +0800
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> I'm using GNU Emacs 24.0.95.1 (i386-mingw-nt5.1.2600) of 2012-04-02 on
> MARVIN on WindowsXP SP3. I believe the issue exists in other version
> as well.
>
> In windows,
> 1. If I select the time zone GMP-5 EST (East Standard Time) and  check
> the enable Daylight Saving Time checkbox, the command
> display-time-world in emacs can show the time of New York correctly
> with DST.
> 2. If I select the time zone GMP-5 EST (East Standard Time) and
> UNCHECK the enable Daylight Saving Time checkbox, or if I select a
> time zone without DST, the command display-time-world in emacs can not
> show the time of New York correctly with DST.
> But actually the display-time-world-list for New York is ("EST5EDT"
> "New York"), which (EST5EDT) supposes to enable the Daylight Saving
> Time to show the time.
>
> I try the following code to trace the issue:
> (setq old-tz (getenv "TZ"))
> (setenv "TZ" "EST+5EDT")
> (message (format "%s" (getenv "TZ")))
> (message (format-time-string "%A %d %B %R %Z"))
> (decode-time)
> (setenv "TZ" "EST+5")
> (message (format "%s" (getenv "TZ")))
> (message (format-time-string "%A %d %B %R %Z"))
> (decode-time)
> (setenv "TZ" old-tz)
>
> The output is (Because I select a timezone without DST in windows, the
> time in the outputs is no DST as I described above):
> "EST+5EDT"
> "Thursday 19 April 11:27 EDT"
> (26 27 11 19 4 2012 4 t -18000)
>
> "EST+5"
> "Thursday 19 April 11:27 EST"
> (34 27 11 19 4 2012 4 nil -18000)
>
> (DST is t if daylight saving time is in effect,otherwise nil.from the
> doc of decode-time) From the output of decode-time, it is clear that
> if the TZ is set to "EST+5EDT", the DST is effect. So it is most
> likely the function format-time-string can not catch this information.
> But it is still weird that it DOES has effect if I enable the DST in
> the Windows system.
>
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#11807: M-x display-time-world & EDT/DST
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> Date: 
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> Tue, 01 Jan 2002 06:00:52 +0530
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)
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> I have an actual watch (which is more reliable) to look up at time.  So
> closing this request.
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>
> --- End Message ---