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C/C++ Source or Header  |  1991-11-19  |  242 b   |  9 lines
  1. /*
  2. ** DOW.H - day-of-week macro.  From the FidoNet CECHO - by
  3. ** Paul Schlyter.
  4. */
  5.  
  6. #define dow(y,m,d)  \
  7.         ( ( ( 3*(y) - (7*((y)+((m)+9)/12))/4 + (23*(m))/9 + (d) + 2    \
  8.         + 15 - (((y)-((m)<3))/100+1) * 3 / 4 ) % 7 ) )
  9.