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Function 5700h          Get File Date and Time

    Returns the time and date a file was last modified (the last time
    its directory entry was updated).

        Entry   AX = 5700h
                BX = File handle

        Return  CX = Time
                DX = Date
                or
                AX = Error code, if CF is set
                     | 06h Invalid handle

    ------------------------------------------------------------------

    The values in CX and DX have the following format:

                Bits    Contents
        CX      0-4     Seconds divided by 2
                5-10    Minutes (0-59)
                11-15   Hours (0-23 on a 24-hour clock)

        DX      0-4     Day of month (1-31)
                5-8     Month (1 = January, 2 = February, etc.)
                9-15    Year offset from 1980
                        (add 1980 to get actual year)