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From: lcc.jbrown@LOCUS.UCLA.EDU (Jordan Brown)
Newsgroups: net.unix
Subject: Dates and Times
Message-ID: <3507@brl-smoke.ARPA>
Date: Wed, 3-Sep-86 07:36:10 EDT
Article-I.D.: brl-smok.3507
Posted: Wed Sep  3 07:36:10 1986
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> Is there also a simple routine that will allow me to calculate
> what day of the week an arbitrary date falls on?

Once you have Julian days (or any other days-since-some-base-date scheme)
you just add some appropriate small constant (0-6) and take it modulo 7.
The small constant depends on what day of the week your base date is;
I usually just fiddle with it until I get today right.  (I can NEVER
remember what the right value is.  I THINK that for Julian the right
value is 6, but am not at all sure.)