From: Ed Reingold <reingold@emr.cs.iit.edu>
Cc: emacs-devel@gnu.org
Subject: Re: 'cal 9 1752' and emacs calendar disagree
Date: Wed, 19 Jul 2006 17:24:24 -0500 [thread overview]
Message-ID: <200607192224.k6JMOOHT024840@emr.cs.iit.edu> (raw)
In-Reply-To: Message from Leon <sdl.web@gmail.com> of "Wed, 19 Jul 2006 23:16:50 BST." <m264httf3h.fsf@sl392.st-edmunds.cam.ac.uk>
No, it is not a bug. The odd Sept 1752 was only that way in England and her
colonies--not in general. It is the Unix cal program that is in error. The
Emacs calendar shows the Gregorian calendar, period. But it allows one to get
dates on many other calendars as well, such as the Julian. What cal gives is
the first part of the month on Julian calendar and the latter part on the
Gregorian--that is nonsense.
The date the switch was made is geographically dependent and stretched over a
period of hundreds of years.
>
> Hi there,
>
> For some historical reasons¹, September 1752 is a special month that
> has no 3 - 13 dates. As you can see, 'cal 9 1752' will gives
>
> September 1752
> Su Mo Tu We Th Fr Sa
> 1 2 14 15 16
> 17 18 19 20 21 22 23
> 24 25 26 27 28 29 30
>
>
> While emacs calendar gives:
>
> September 1752
> Su Mo Tu We Th Fr Sa
> 1 2
> 3 4 5 6 7 8 9
> 10 11 12 13 14 15 16
> 17 18 19 20 21 22 23
> 24 25 26 27 28 29 30
>
> Is this a bug?
>
> Footnotes:
> ¹ http://www.farid-hajji.net/fun/cj-cal91752.html
> --
> Leon
>
>
>
> _______________________________________________
> Emacs-devel mailing list
> Emacs-devel@gnu.org
> http://lists.gnu.org/mailman/listinfo/emacs-devel
next prev parent reply other threads:[~2006-07-19 22:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <sdl.web@gmail.com>
2006-07-19 22:16 ` 'cal 9 1752' and emacs calendar disagree Leon
2006-07-19 22:24 ` Ed Reingold [this message]
2006-07-19 22:29 ` Kim F. Storm
2006-07-20 15:32 ` Richard Stallman
2006-07-19 22:28 ` Nic James Ferrier
2006-07-19 22:36 ` Andreas Schwab
2006-07-19 23:15 ` Leon
2006-07-19 23:24 ` Nic James Ferrier
2006-12-17 23:35 ` ediff output Michael Kifer
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