Path: utzoo!attcan!uunet!lll-winken!ames!pasteur!ucbvax!hplabs!hpda!hpcuhb!hpsmtc1!swh
From: swh@hpsmtc1.HP.COM (Steve Harrold)
Newsgroups: comp.sources.wanted
Subject: Re: Need Routine to Calculate Day of Week
Message-ID: <11720006@hpsmtc1.HP.COM>
Date: 11 Jan 89 16:02:36 GMT
References: <176@jetson.UPMA.MD.US>
Organization: Hewlett Packard, Cupertino
Lines: 9

Re: day-of-week code

Sorry, no source, but here's the outline:

Insert the day/month/year into a tm struct, and call mktime().
The result, when divided by 86400L (60*60*24) gives number of days
since Jan 1, 1970.  Find out what day of week the 1/1/70 date was
and add it to the result.  A simple modulo 7 calculation will now tell
you what day of week your desired date is.