Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!portal!cup.portal.com!pats
From: pats@cup.portal.com (Pat T Shea)
Newsgroups: comp.sys.ibm.pc
Subject: Re: calendar code
Message-ID: <19971@cup.portal.com>
Date: 29 Jun 89 00:19:58 GMT
References: <82362@ti-csl.csc.ti.com> <25831@agate.BERKELEY.EDU>
Organization: The Portal System (TM)
Lines: 22

'think this is what ur looking for. . . . /pats.
 
/***********************************************************************
 *
 *          int  dmy2dow( int iDay, int iMon, int iYear ) - This is my
 *             implementation of the Zeller function.  It takes day/
 *             month/year and returns the day of the week as an int
 *             with Sunday being 0.....etc.
 *  /pats @Psi!
 *  11/05/85
 ******/
int dmy2dow( int day, int mon, int year )
{
   int adj_mo, adj_yr, cent, cent_yrs;
 
   adj_mo = ( mon > 2 ) ? mon - 2 : mon + 10;
   adj_yr = ( mon > 2 ) ? year    : year - 1;
   cent = adj_yr / 100;
   cent_yrs = adj_yr % 100;
   return((((( 13 * adj_mo - 1 ) / 5 ) + day + cent_yrs +
             ( cent_yrs / 4 ) + ( cent / 4 ) - 2 * cent + 77 ) % 7 ));
}