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The Devil's Doorknob BBS Capture (1996-2003)
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DOW.H
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1991-11-19
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242b
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9 lines
/*
** DOW.H - day-of-week macro. From the FidoNet CECHO - by
** Paul Schlyter.
*/
#define dow(y,m,d) \
( ( ( 3*(y) - (7*((y)+((m)+9)/12))/4 + (23*(m))/9 + (d) + 2 \
+ 15 - (((y)-((m)<3))/100+1) * 3 / 4 ) % 7 ) )