GNU bug report logs - #14210
23.4; Timezone handling?

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From: Eli Zaretskii <eliz <at> gnu.org>
To: "Julio Pacheco T." <julio.pacheco <at> provectis.cl>
Cc: 14210 <at> debbugs.gnu.org
Subject: bug#14210: 23.4; Timezone handling?
Date: Tue, 16 Apr 2013 09:01:44 +0300

> Date: Mon, 15 Apr 2013 12:40:22 -0300
> From: "Julio Pacheco T." <julio.pacheco <at> provectis.cl>
> 
> Apparently, Emacs is ignoring the system timezone settings and using its 
> own definitions.

Not really, no.

> In Chile, the switch from daylight savings to standard time has been 
> postponed from March 10 00:00 to April 28 00:00, and the system tzdata 
> files have been properly updated; however, inside Emacs, the timezone is 
> reported as CLT instead of CLST:
> 
> Output of zdump -v Chile/Continental | grep 2013
> ------------------------------------------------
> Chile/Continental  Sun Apr 28 02:59:59 2013 UTC = Sat Apr 27 23:59:59 2013 
> CLST isdst=1 gmtoff=-10800
> Chile/Continental  Sun Apr 28 03:00:00 2013 UTC = Sat Apr 27 23:00:00 2013 
> CLT isdst=0 gmtoff=-14400
> Chile/Continental  Sun Sep  8 03:59:59 2013 UTC = Sat Sep  7 23:59:59 2013 
> CLT isdst=0 gmtoff=-14400
> Chile/Continental  Sun Sep  8 04:00:00 2013 UTC = Sun Sep  8 01:00:00 2013 
> CLST isdst=1 gmtoff=-10800
> 
> Output of emacs Calendar/Lunar phases (note the switch CLST-> CLT in the 
> Mar 4 - Mar 11 interval, instead of Apr25 - May2):
> ---------------------------------------
> Monday, March 4, 2013: Last Quarter Moon 6:59pm (CLST)
> Monday, March 11, 2013: New Moon 3:54pm (CLT)
> Tuesday, March 19, 2013: First Quarter Moon 1:28pm (CLT)
> Wednesday, March 27, 2013: Full Moon 5:26am (CLT)
> Wednesday, April 3, 2013: Last Quarter Moon 12:43am (CLT)
> Wednesday, April 10, 2013: New Moon 5:39am (CLT)
> Thursday, April 18, 2013: First Quarter Moon 8:33am (CLT)
> Thursday, April 25, 2013: Full Moon 3:55pm (CLT)
> Thursday, May 2, 2013: Last Quarter Moon 7:21am (CLT)
> Thursday, May 9, 2013: New Moon 8:32pm (CLT)
> Saturday, May 18, 2013: First Quarter Moon 12:36am (CLT)
> Saturday, May 25, 2013: Full Moon 12:22am (CLT)
> Friday, May 31, 2013: Last Quarter Moon 3:05pm (CLT)
> 
> Also, in org-mode the timestamps created by org-clock-in are off by -1 
> hour, so the discrepancies in timezone are not mode-specific.
> 
> So, where is emacs actually getting the timezone info from?

From your system, of course.  Although packages like Calendar might
sometimes offer features that use some internal data (but not in this
case, I think).

Let's start with the basics: What does this print:

   M-: (format-time-string "%H:%M %Z %z")

and how does the time it shows compare with your system clock?

Next, do you have a TZ variable in your environment, and if you do,
what is its value?

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