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bug#641: format-time-string %Z does not work, starting with Emacs 22.2
From: |
Eli Zaretskii |
Subject: |
bug#641: format-time-string %Z does not work, starting with Emacs 22.2 |
Date: |
Tue, 05 Aug 2008 21:34:35 +0300 |
> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Mon, 4 Aug 2008 15:07:28 -0700
> Cc:
>
> > From: martin rudalics Sent: Monday, August 04, 2008 2:24 PM
> > > emacs -Q
> > > M-: (format-time-string "%Z) ==> ""
> > > M-: (format-time-string "%z) ==> "-0700"
> > >
> > > The %Z string is incorrect. In my case, it should be (as it is in
> > > Emacs 20 and Emacs 22.1): "Pacific Daylight Time".
> > >
> > > This same bug appears in Emacs 23. This is a regression from Emacs
> > > 22.1.
> >
> > See
> > 2007-06-07 Jason Rumney <jasonr@gnu.org>
> > * s/ms-w32.h: Don't define HAVE_TZNAME.
> > * editfns.c (Fcurrent_time_zone): Remove hack for
> > Japanese Windows.
> >
> > and the preceding discussion starting with
> > http://lists.gnu.org/archive/html/emacs-devel/2007-06/msg00334.html
>
> Sorry; I don't know what all of that means.
What it means is that we did this on purpose, and therefore the fact
you get an empty string for %Z is not a bug.
> It is obviously a bug, however, that %Z produces an empty time-zone string. I
> use it for a time stamp, for instance, with this form:
> (format-time-string "%a %b %e %T %Y (%Z)")
>
> After the change that introduced the bug, I get this:
>
> Mon Aug 4 15:01:16 2008 ()
>
> instead of this:
>
> Mon Aug 4 15:01:16 2008 (Pacific Daylight Time)
"Pacific Daylight Time" is not a Posix- or RFC-822 compliant timezone
specification. It comes from the MS-Windows version of `tzname',
which produces RFC-compliant TZ strings only for a very small subset
of timezone specifications, and even that only after you call `tzset'
from within an application. So we disabled the use of `tzname' on
Windows to avoid producing non-compliant timezone strings, which could
break others, e.g. if used in an email message header.
Posix specifies that if `tzname' is not available, %Z should produce
an empty string. This means that an empty string is a valid result of
format-time-string for %Z, and if you use %Z in your Lisp code, you
should make allowances for the case of an empty string, no matter on
which platform.
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/01
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, martin rudalics, 2008/08/04
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/04
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, martin rudalics, 2008/08/05
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2,
Eli Zaretskii <=
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/05
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Eli Zaretskii, 2008/08/05
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Eli Zaretskii, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Juanma Barranquero, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Drew Adams, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Juanma Barranquero, 2008/08/06
- Message not available
- Re: bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Ted Zlatanov, 2008/08/06
- bug#641: format-time-string %Z does not work, starting with Emacs 22.2, Juanma Barranquero, 2008/08/06