debby@jetson.UPMA.MD.US (Debby Hillman) (01/11/89)
I need source code, preferably in C, which will calculate the day of week for any day/month/year, or, equivalently, the day of the week any month starts with. Please email any replies to uunet!jetson!debby or debby@jetson.UPMA.MD.US. Thanks in advance, Debby
swh@hpsmtc1.HP.COM (Steve Harrold) (01/12/89)
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.