From: Larry Denenberg <larry@denenberg.com>
Cc: larry@denenberg.com, denis.roegel@loria.fr, reingold@cs.uiuc.edu
Subject: Timezone error in calculating dates of equinoxes and solstices
Date: Mon, 23 Sep 2002 13:18:14 CDT [thread overview]
Message-ID: <200209231818.g8NIIGI6016740@stay.intouchsys.com> (raw)
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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.1.2 (sparc-sun-solaris2.5, X toolkit)
of 2002-05-23 on stay.intouchsys.com
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: nil
locale-coding-system: nil
default-enable-multibyte-characters: t
Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:
In timezone US/Eastern, emacs reports the wrong date for this year's
autumnal equinox. It should be 12:55 AM EDT September 23 but is
reported as 12:55 AM EDT September 22.
(setq displayed-month 9)
9
(setq displayed-year 2002)
2002
(solar-equinoxes-solstices)
(((9 22 2002) "Autumnal Equinox 12:55am (EDT)"))
When I run emacs with TZ=US/Central, the last command correctly returns
(((9 22 2002) "Autumnal Equinox 11:55pm (CDT)"))
I believe that the bug is in function solar-equinoxes-solstices, which
doesn't correctly convert the result of solar-equinoxes/solstices to
daylight time.
/Larry Denenberg
larry@denenberg.com
http://larry.denenberg.com/
reply other threads:[~2002-09-23 18:18 UTC|newest]
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