Int 21 Fn 2B - DOS 1+ - Set System Date [D]
AH = 2Bh
CX = year (1980-2099)
DH = month
DL = day
Return: AL = status
00h successful
FFh invalid date, system date unchanged
Note: DOS 3.3+ also sets CMOS clock
See Also: AH=2Ah,AH=2Dh,INT 1A/AH=05h
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