From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Ryde Newsgroups: gmane.emacs.bugs Subject: bug#7337: 23.2; (require 'time) changes timezone Date: Sat, 06 Nov 2010 08:46:42 +1100 Message-ID: <87fwvftpdp.fsf@blah.blah> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: dough.gmane.org 1288995232 29767 80.91.229.12 (5 Nov 2010 22:13:52 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 5 Nov 2010 22:13:52 +0000 (UTC) To: 7337@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Nov 05 23:13:44 2010 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1PEUXY-0007BE-5Y for geb-bug-gnu-emacs@m.gmane.org; Fri, 05 Nov 2010 23:13:44 +0100 Original-Received: from localhost ([127.0.0.1]:49418 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PEUXX-0006eb-4B for geb-bug-gnu-emacs@m.gmane.org; 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Fri, 05 Nov 2010 17:48:43 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PEU9J-0001Ot-Mi for bug-gnu-emacs@gnu.org; Fri, 05 Nov 2010 17:48:42 -0400 Original-Received: from mailout2-5.pacific.net.au ([61.8.2.228]:49288 helo=mailout2.pacific.net.au) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PEU9J-0001Oe-4f for bug-gnu-emacs@gnu.org; Fri, 05 Nov 2010 17:48:41 -0400 Original-Received: from mailproxy2.pacific.net.au (mailproxy2.pacific.net.au [61.8.2.163]) by mailout2.pacific.net.au (Postfix) with ESMTP id ED77F2A6368 for ; Sat, 6 Nov 2010 08:48:36 +1100 (EST) Original-Received: from blah.blah (unknown [203.26.175.99]) by mailproxy2.pacific.net.au (Postfix) with ESMTP id 8A56327409 for ; Sat, 6 Nov 2010 08:48:30 +1100 (EST) Original-Received: from gg by blah.blah with local (Exim 4.72) (envelope-from ) id 1PEU7O-0001VV-5d for bug-gnu-emacs@gnu.org; Sat, 06 Nov 2010 08:46:42 +1100 User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.2 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Fri, 05 Nov 2010 17:45:02 -0400 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:41398 Archived-At: Doing a (require 'time) changes the `current-time-zone' to the system default per a (set-time-zone-rule nil). I think that loading a .el shouldn't change the zone. The effect can be seen from "emacs -Q" (let (before after) (set-time-zone-rule "ABC+1") (setq before (current-time-zone)) (require 'time) (setq after (current-time-zone)) (list (car before) (car after))) => (-3600 39600) where I expected => (-3600 -3600) which is what happens if evaluated a second time, since (require 'time) is then a no-op. I suppose it comes from display-time-world-list probing whether the Olson timezone names are known to the C library. I think it should save and restore the existing TZ the way `add-change-log-entry' and `time-stamp-string' do. For some of my own code lately I tried a macro to hide the details and the unwind-protect a bit. Perhaps a name like with-time-zone-rule or with-temporary-time-zone-rule would match set-time-zone-rule better than "...-TZ". (defmacro xtide-with-TZ (tz &rest body) "Run BODY with `set-time-zone-rule' temporarily to TZ. The current timezone (per `getenv' \"TZ\") is restored by an `unwind-protect'." (declare (indent 1)) `(let ((xtide-with-TZ--old (getenv "TZ"))) (set-time-zone-rule ,tz) (unwind-protect (progn ,@body) (set-time-zone-rule xtide-with-TZ--old)))) In GNU Emacs 23.2.1 (i486-pc-linux-gnu, GTK+ Version 2.20.0) of 2010-05-16 on raven, modified by Debian configured using `configure '--build' 'i486-linux-gnu' '--build' 'i486-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/23.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.2/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS='' 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_AU value of $XMODIFIERS: nil locale-coding-system: iso-latin-1-unix default enable-multibyte-characters: t