Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!deimos.cis.ksu.edu!rutgers!hjuxa!mal
From: mal@hjuxa.UUCP (LEACH)
Newsgroups: comp.lang.pascal
Subject: Re: Day-of-week algorithm, please!
Message-ID: <1436@hjuxa.UUCP>
Date: 13 Apr 89 13:27:45 GMT
References: <2394@maccs.McMaster.CA>
Organization: Digital Equipment Corp, Manalapan NJ
Lines: 18

From article <2394@maccs.McMaster.CA>, by cs3b3aj@maccs.McMaster.CA (Stephen M. Dunn):
> In article <1780001@hpcc01.HP.COM> azarian@hpcc01.HP.COM (Randy Azarian) writes:
> ...
>>  total := total + + (year - 1) div 4;
> 
>    But watch out, because not every year such that year mod 4 = 0 is a leap
> year!  The strangeness in the pattern occurs on century years, but I'm not 
> sure which way round it is.  It is either that years divisible by 400 are

A year is a leap year if it is evenly divisible by 4 and not evenly divisible
by 100; unless, of course, it is divisible by 400.

1900 was not a leap year.
2000 will be.

-- 
Michael A. Leach   uucp:    {decvax,clyde,rutgers,decuac}!hjuxa!mal
		   email:   hjuxa!mal@decuac.dec.com  OR  leach@unxa.dec.com