DOS Fn 2bH: Set DOS Date

                                                         Compatibility: 1.0+ 
 Expects: AH    2bH
          CX    year (1980 to 2099)
          DH    month (1 to 12)
          DL    day (1 to 31)
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 Returns: AL    0    if date was valid
                0ffH if date was invalid (30 day values hath September...)
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    Info: Sets the DOS system date.  The system time is not changed.

Versions: ■ DOS 3.3+  On AT and PS/2 systems, this also sets the date in
            the battery-backed CMOS memory.

See Also: Fn 2cH (set time)
          Fn 2aH (set date)
          DOS Functions
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