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Re: calendar gets wrong end for Daylight Savings Time


From: James Cloos
Subject: Re: calendar gets wrong end for Daylight Savings Time
Date: Mon, 06 Nov 2006 17:17:52 -0500
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/23.0.0 (gnu/linux)

>>>>> "Richard" == Richard Stallman <address@hidden> writes:

Richard> It seems that the Emacs calendar should have a data base of
Richard> history of daylight savings time for various named regions.
Richard> But maybe that is too much work to be feasible.

tzdata¹, used by glibc and others, does exactly this.  And most of the
linux and bsd -based dists have unbundled it from the libc packages to
make it easier to keep up to date.  (As an example, in Gentoo it is
called sys-libs/timezone-data.)

The zonefiles have full historical data for each zone, and the api
should allow access to that data.

Ie, tzdata's zonefiles will not have waited until the first Sunday in
November to turn off DST in the US this year, but will use the new
dates starting in 2007.

-JimC

1) The primary distribution site is:  ftp://elsie.nci.nih.gov/pub/
   and they are updated regularly whenever changes are made by
   the various jurisdictions.  I believe 2006n is the current version.

-- 
James Cloos <address@hidden>         OpenPGP: 0xED7DAEA6




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