GNU bug report logs - #31452
emacs 25.3; timezone handling broken

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: e step <etelepr <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: emacs 25.3; timezone handling broken
Date: Mon, 14 May 2018 10:36:06 -0400

[Message part 1 (text/plain, inline)]

  1. I installed emacs 25.3_1 for Windows
  2. From cygwin shell, I did "/c/emacs25/emacs-25.3_1-x86_64/bin/emacs.exe
-Q"
  3. Within emacs, I did M-: (getenv "TZ") which returned "America/New
York".
  4. Within emacs, I did M-: (current-time-string)
  5. The resulting time is using incorrect time zone.
  6. Inside cygwin, I did "export TZ=" to unset the TZ variable.
  7. Within emacs, I did M-: (getenv "TZ") which returned nil.
  8. Within emacs, I did M-: (current-time-string) to get correct time.

My work around is to not set the TZ variable which is doable but not
desirable.



In GNU Emacs 25.3.1 (x86_64-w64-mingw32)
 of 2017-09-26 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 10.0.17134
Configured using:
 'configure --without-dbus --without-compress-install 'CFLAGS=-O2
 -static -g3' PKG_CONFIG_PATH=/mingw64/lib/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-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-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
"America/New_York"
Quit
"Mon May 14 15:28:21 2018"

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns help-mode easymenu
cl-loaddefs pcase cl-lib mail-prsvr mail-utils time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)

Memory information:
((conses 16 88765 5870)
 (symbols 56 19651 0)
 (miscs 48 44 85)
 (strings 32 15897 4470)
 (string-bytes 1 440523)
 (vectors 16 11730)
 (vector-slots 8 424140 5367)
 (floats 8 159 44)
 (intervals 56 236 56)
 (buffers 976 19))

[Message part 2 (text/html, inline)]

Message #10 received at 31452 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: e step <etelepr <at> gmail.com>
Cc: 31452 <at> debbugs.gnu.org
Subject: Re: bug#31452: emacs 25.3; timezone handling broken
Date: Mon, 14 May 2018 18:45:49 +0300

tags 31452 notabug
thanks

> From: e step <etelepr <at> gmail.com>
> Date: Mon, 14 May 2018 10:36:06 -0400
> 
>   1. I installed emacs 25.3_1 for Windows
>   2. From cygwin shell, I did "/c/emacs25/emacs-25.3_1-x86_64/bin/emacs.exe -Q"
>   3. Within emacs, I did M-: (getenv "TZ") which returned "America/New York".
>   4. Within emacs, I did M-: (current-time-string)
>   5. The resulting time is using incorrect time zone.
>   6. Inside cygwin, I did "export TZ=" to unset the TZ variable.
>   7. Within emacs, I did M-: (getenv "TZ") which returned nil.
>   8. Within emacs, I did M-: (current-time-string) to get correct time.
> 
> My work around is to not set the TZ variable which is doable but not desirable. 

You are using a native Windows build of Emacs, which doesn't support
Posix-style TZ specifications such "America/New York" (which actually
points to a file with timezone information).  The native Windows build
supports only the old simplified TZ specs such as EST-5EDT.  If you
want Posix TZ specs to be supported, I suggest to use a Cygwin build
of Emacs instead.

When you don't define TZ in the environment, the native Windows build
of Emacs uses the system timezone, which is defined in the Registry,
not through environment variables.

This is not a bug, but expected behavior.  Windows is not a Posix
system, and starting Emacs from a Cygwin shell cannot change that.

Thanks.

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