INT 21 - DOS 2+ - GET FILE'S DATE AND TIME
        AX = 5700h
        BX = file handle
Return: CF clear if successful
            CX = file's time
                bits 15-11: hours (0-23)
                     10-5:  minutes
                      4-0:  seconds/2
            DX = file's date
                bits 15-9: year - 1980
                      8-5: month
                      4-0: day
        CF set on error
            AX = error code (01h,06h) (see AH=59h)
Note:   under DR-DOS 3.41 and 5.0, this function returns 0 (no date/time) for
          character devices; MS-DOS returns date and time of opening
SeeAlso: AX=5701h

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