bug#14210: 23.4; Timezone handling?

bug#14210: 23.4; Timezone handling?

[Julio Pacheco T.]

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your report will be posted to the bug-gnu-emacs@gnu.org mailing list
and the gnu.emacs.bug news group, and at http://debbugs.gnu.org.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

----

Apparently, Emacs is ignoring the system timezone settings and using its 
own definitions.

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?

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
     `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/23.4/etc/DEBUG.


In GNU Emacs 23.4.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.12)
  of 2012-09-22 on allspice, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
configured using `configure  '--build' 'x86_64-linux-gnu' '--build' 
'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' 
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.4/site-lisp:/usr/share/emacs/site-lisp' 
'--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes' 
'--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 
'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector 
--param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall -DDEBIAN 
-O2' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
   value of $LC_ALL: nil
   value of $LC_COLLATE: nil
   value of $LC_CTYPE: nil
   value of $LC_MESSAGES: nil
   value of $LC_MONETARY: nil
   value of $LC_NUMERIC: nil
   value of $LC_TIME: nil
   value of $LANG: en_US.UTF-8
   value of $XMODIFIERS: nil
   locale-coding-system: utf-8-unix
   default enable-multibyte-characters: t

Major mode: Calendar

Minor modes in effect:
   tooltip-mode: t
   mouse-wheel-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <menu-bar> <tools> <calendar> <help-echo>
<menu-bar> <Sun/Moon> <Lunar Phases> <escape>  r e p o r t
- <tab> <return>

Recent messages:
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el 
(source)...done
Loading debian-ispell...done
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done
Loading /etc/emacs/site-start.d/50emacs-goodies-el.el (source)...done
Loading /etc/emacs/site-start.d/50flim.el (source)...done
Loading /etc/emacs/site-start.d/50org-mode.el (source)...done
Loading /etc/emacs/site-start.d/50w3m-el.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Computing phases of the moon...done

Load-path shadows:
/usr/share/emacs/23.4/site-lisp/debian-startup hides 
/usr/share/emacs/site-lisp/debian-startup
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/usr/share/emacs23/site-lisp/flim/hex-util hides 
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/usr/share/emacs23/site-lisp/dictionaries-common/flyspell hides 
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/usr/share/emacs23/site-lisp/org-mode/org-freemind hides 
/usr/share/emacs/23.4/lisp/org/org-freemind
/usr/share/emacs23/site-lisp/org-mode/org-archive hides 
/usr/share/emacs/23.4/lisp/org/org-archive
/usr/share/emacs23/site-lisp/org-mode/org-compat hides 
/usr/share/emacs/23.4/lisp/org/org-compat
/usr/share/emacs23/site-lisp/org-mode/org-xoxo hides 
/usr/share/emacs/23.4/lisp/org/org-xoxo
/usr/share/emacs23/site-lisp/org-mode/org-plot hides 
/usr/share/emacs/23.4/lisp/org/org-plot
/usr/share/emacs23/site-lisp/org-mode/org-src hides 
/usr/share/emacs/23.4/lisp/org/org-src
/usr/share/emacs23/site-lisp/org-mode/org-habit hides 
/usr/share/emacs/23.4/lisp/org/org-habit
/usr/share/emacs23/site-lisp/org-mode/org-mew hides 
/usr/share/emacs/23.4/lisp/org/org-mew
/usr/share/emacs23/site-lisp/org-mode/org-mobile hides 
/usr/share/emacs/23.4/lisp/org/org-mobile
/usr/share/emacs23/site-lisp/org-mode/org-w3m hides 
/usr/share/emacs/23.4/lisp/org/org-w3m
/usr/share/emacs23/site-lisp/org-mode/org-datetree hides 
/usr/share/emacs/23.4/lisp/org/org-datetree
/usr/share/emacs23/site-lisp/org-mode/org-indent hides 
/usr/share/emacs/23.4/lisp/org/org-indent
/usr/share/emacs23/site-lisp/org-mode/org-wl hides 
/usr/share/emacs/23.4/lisp/org/org-wl
/usr/share/emacs23/site-lisp/org-mode/org-remember hides 
/usr/share/emacs/23.4/lisp/org/org-remember
/usr/share/emacs23/site-lisp/org-mode/org-crypt hides 
/usr/share/emacs/23.4/lisp/org/org-crypt
/usr/share/emacs23/site-lisp/org-mode/org-docbook hides 
/usr/share/emacs/23.4/lisp/org/org-docbook
/usr/share/emacs23/site-lisp/org-mode/org-mhe hides 
/usr/share/emacs/23.4/lisp/org/org-mhe
/usr/share/emacs23/site-lisp/org-mode/org-protocol hides 
/usr/share/emacs/23.4/lisp/org/org-protocol
/usr/share/emacs23/site-lisp/org-mode/org-list hides 
/usr/share/emacs/23.4/lisp/org/org-list
/usr/share/emacs23/site-lisp/org-mode/org-irc hides 
/usr/share/emacs/23.4/lisp/org/org-irc
/usr/share/emacs23/site-lisp/org-mode/org-inlinetask hides 
/usr/share/emacs/23.4/lisp/org/org-inlinetask
/usr/share/emacs23/site-lisp/org-mode/org-timer hides 
/usr/share/emacs/23.4/lisp/org/org-timer
/usr/share/emacs23/site-lisp/org-mode/org-jsinfo hides 
/usr/share/emacs/23.4/lisp/org/org-jsinfo
/usr/share/emacs23/site-lisp/org-mode/org-install hides 
/usr/share/emacs/23.4/lisp/org/org-install
/usr/share/emacs23/site-lisp/org-mode/org-attach hides 
/usr/share/emacs/23.4/lisp/org/org-attach
/usr/share/emacs23/site-lisp/org-mode/org-macs hides 
/usr/share/emacs/23.4/lisp/org/org-macs
/usr/share/emacs23/site-lisp/org-mode/org-faces hides 
/usr/share/emacs/23.4/lisp/org/org-faces
/usr/share/emacs23/site-lisp/org-mode/org-exp hides 
/usr/share/emacs/23.4/lisp/org/org-exp
/usr/share/emacs23/site-lisp/org-mode/org-info hides 
/usr/share/emacs/23.4/lisp/org/org-info
/usr/share/emacs23/site-lisp/org-mode/org-clock hides 
/usr/share/emacs/23.4/lisp/org/org-clock
/usr/share/emacs23/site-lisp/org-mode/org-colview hides 
/usr/share/emacs/23.4/lisp/org/org-colview
/usr/share/emacs23/site-lisp/org-mode/org hides 
/usr/share/emacs/23.4/lisp/org/org
/usr/share/emacs23/site-lisp/org-mode/org-ascii hides 
/usr/share/emacs/23.4/lisp/org/org-ascii
/usr/share/emacs23/site-lisp/org-mode/org-mac-message hides 
/usr/share/emacs/23.4/lisp/org/org-mac-message
/usr/share/emacs23/site-lisp/org-mode/org-html hides 
/usr/share/emacs/23.4/lisp/org/org-html
/usr/share/emacs23/site-lisp/org-mode/org-exp-blocks hides 
/usr/share/emacs/23.4/lisp/org/org-exp-blocks
/usr/share/emacs23/site-lisp/org-mode/org-vm hides 
/usr/share/emacs/23.4/lisp/org/org-vm
/usr/share/emacs23/site-lisp/org-mode/org-bibtex hides 
/usr/share/emacs/23.4/lisp/org/org-bibtex
/usr/share/emacs23/site-lisp/org-mode/org-rmail hides 
/usr/share/emacs/23.4/lisp/org/org-rmail
/usr/share/emacs23/site-lisp/org-mode/org-gnus hides 
/usr/share/emacs/23.4/lisp/org/org-gnus
/usr/share/emacs23/site-lisp/org-mode/org-publish hides 
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/usr/share/emacs23/site-lisp/org-mode/org-table hides 
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/usr/share/emacs/23.4/lisp/org/org-agenda
/usr/share/emacs23/site-lisp/org-mode/org-mouse hides 
/usr/share/emacs/23.4/lisp/org/org-mouse
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/usr/share/emacs23/site-lisp/org-mode/org-feed hides 
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/usr/share/emacs23/site-lisp/org-mode/org-latex hides 
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folding-isearch folding advice help-fns advice-preload easymenu w3m-load
org-install emacs-goodies-el emacs-goodies-custom emacs-goodies-loaddefs
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x-dnd font-setting tool-bar dnd fontset image fringe lisp-mode register
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font-lock syntax facemenu font-core frame cham georgian utf-8-lang
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greek romanian slovak czech european ethiopic indian cyrillic chinese
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format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind system-font-setting
font-render-setting gtk x-toolkit x multi-tty emacs)

bug#14210: 23.4; Timezone handling?

[Eli Zaretskii]

> Date: Mon, 15 Apr 2013 12:40:22 -0300
> From: "Julio Pacheco T." <julio.pacheco@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?

bug#14210: 23.4; Timezone handling?

[Julio Pacheco T.]

Solved.

Just for completeness, the answer to your questions:
> Let's start with the basics: What does this print:
>
>     M-: (format-time-string "%H:%M %Z %z")

"09:01 CLT -0400"

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

On the console:
$ date +"%H:%M %Z %z"
09:02 CLT -0400

On the clock applet in the desktop:
10:02 America/Santiago

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

There is no TZ variable defined in the environment.

>
>

Thanks to your hint, I've traced the actual problem to a stray 
/etc/localtime that somehow didn't get updated with the rest of the 
zonedata package.

Apparently, the desktop clock applet gets the timezone info directly from 
/usr/share/zoneinfo/*, while the command line utilities and Emacs use 
/etc/localtime first (checked with strace).

Regards,
Julio Pacheco

El 16/04/2013 3:01, Eli Zaretskii escribió:
>> Date: Mon, 15 Apr 2013 12:40:22 -0300
>> From: "Julio Pacheco T." <julio.pacheco@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?
>
>

bug#14210: 23.4; Timezone handling?

[Eli Zaretskii]

> Date: Tue, 16 Apr 2013 10:40:08 -0300
> From: "Julio Pacheco T." <julio.pacheco@provectis.cl>
> 
> Solved.

Great, closing.