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From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.questions
Subject: Re: Daylight Savings Time, Leap Years, ctime, and date
Message-ID: <1459@auspex.auspex.com>
Date: 18 Apr 89 07:40:41 GMT
References: <1006@necis.UUCP> <489@lakart.UUCP> <1918@edison.GE.COM>
Reply-To: guy@auspex.auspex.com (Guy Harris)
Distribution: usa
Organization: Auspex Systems, Santa Clara
Lines: 11


 > >   2) Does anyone know if the new versions are less naive about determining
 > >      leap years? It seems the current routines only use the "year % 4 ==0"
 > >      rule.
 > 
 >Fixed by POSIX as I recall.  (POSIX == IEEE 1003.1 standard in this case).

Nope.  POSIX just refers to ANSI C for the descriptions of "localtime"
and "mktime", and the (d)(p)ANS doesn't say anything about how those
routines should decide what a leap year is.  It's a
quality-of-implementation issue.