Int 21/AH=2Bh

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DOS 1+ - SET SYSTEM DATE

AH = 2Bh
CX = year (1980-2099)
DH = month (1-12)
DL = day (1-31)

Return:
AL = status 00h successful FFh invalid date, system date unchanged

Note: DOS 3.3+ also sets CMOS clock; due to the limitations of the CLOCK$ driver interface, the CMOS time is also updated to the current DOS time (which is the BIOS time-of-day clock with the default CLOCK$ driver)

See Also: AH=2Ah - AH=2Dh - INT 1A/AH=05h

Category: DOS Kernel - Int 21h - D

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