X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos

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INT 21 - DOS - SET CURRENT DATE
        AH = 2Bh
        DL = day
        DH = month
        CX = year
Return: AL = 00h if no error
           = FFh if bad value sent to routine
Note:   DOS 3.3+ also sets CMOS clock
SeeAlso: AH=2Ah,AH=2Dh,INT 1A/AH=05h

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