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From: Jason Rumney <jasonr@btinternet.co>
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Subject: Re: 21.1: calendar: daylight saving time wrong
Date: Mon, 25 Mar 2002 20:22:34 +0000 (UTC)
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"Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de> writes:

> > The DST information comes from the operating system, not from within Emacs.
> 
> Yes, however "TZEDIT from the Windows Resource kit says DST switching 
> will take effect on last sunday in March.

>From my previous correspondence with Microsoft about bugs in their
C library implementation of timezones, I can tell you that what TZEDIT
tells about NT's knowledge of timezones may have no bearing on what
the C library does.  The implementation of timezones in the OS itself,
and in Microsoft's proprietary API for accessing this info seems to be
bug free, it is their C library that is buggy.

-- 
Jason Rumney