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  Description:  Set Date
 
  Initializes the system clock driver to a specific date. The system time
  is not affected.
 
  Input                                  Output
  ═══════════════════════════            ═════════════════════════════════
  AH=2BH                                 AL=00H  if date set successfully
  CX=year (1980 through 2099)               FFH  if date not valid (ignored)
  DH=month (1 through 12)
  DL=day (1 through 31)
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