Get file server date and time (INT 21h, E7h - Novell NetWare 4.0)

        Entry:
          AH = E7h
          DS:DX -> reply buffer
                BYTE  year - 1900
                BYTE  month
                BYTE  day
                BYTE  hours
                BYTE  minutes
                BYTE  seconds
                BYTE  day of week (0 = Sunday)
        Return:
          AL = error code