Path: utzoo!utgpu!news-server.csri.toronto.edu!dgp.toronto.edu!flaps
Newsgroups: comp.lang.c
From: flaps@dgp.toronto.edu (Alan J Rosenthal)
Subject: Re: day of week
Message-ID: <1990Sep22.184600.10813@jarvis.csri.toronto.edu>
References: <1990Sep21.232813.2516@cbnewsm.att.com>
Distribution: na
Date: 22 Sep 90 22:46:01 GMT
Lines: 5

Given the number of days since a day which is a Thursday, the day number of the
week is simply:
	(number_of_days + 4) % 7

No need for Zeller's congruence.