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        Get/set file's date/time (INT 21h, 57h)

        Entry:
          AH = 57h
          AL = function code
                  0 = get date and time
                  1 = set date and time
                     CX = time to be set (if AL = 1)
                     DX = date to be set (if AL = 1)
          BX = file handle
        Return:
          CF = 1 if error
                  AX = Error Code
          CX = time of last write (if AL = 0)
          DX = date of last write (if AL = 0)