From owner-freebsd-bugs  Mon Mar 30 05:20:33 1998
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Date: Mon, 30 Mar 1998 23:16:08 +1000
From: Bruce Evans <bde@zeta.org.au>
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To: ache@FreeBSD.ORG, helbig@Informatik.BA-Stuttgart.DE
Subject: Re: bin/6164
Cc: freebsd-bugs@FreeBSD.ORG
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>Hmm. The reason for this warning message (``non existent UCT time'')
>is an erraneous use of mktime(3): mktime(3) *always* assumes
>that the passed tm structure (utc) holds *local* time, even if the
>parameter is filled by gmtime(3). 
>At March 29th 4:01 CEST gmtime() put 2:01 into utc, which is correct.
>Then mktime(3) assumes March 29th 2:01 *local* time which does not exist.

Isn't that the point of using local time?  The purpose of `adjkerntz -a'
is to adjust the RTC to local time when DST changes.  The adjustment
can't be done if it would give a nonexistent time or an ambiguous time.
mktime() happens to handle nonexistent times in a convenient way (by
failing; it's not clear what else it could do).  I think there are more
problems with ambiguous times when DST starts, since mktime() doesn't
fail then.

Bruce

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