AH=2DH - 8086 INT 21H

AH = 2Dh - SET SYSTEM TIME
Entry: CH = hour CL = minute DH = second DL = 1/100 seconds
Return:
AL = 00h successful
FFh if invalid time, system time unchanged
Note: DOS 3.3+ also sets CMOS clock

Syntax

MOV AH,2DH
INT 21H

Example

.data
	hour db 15h
	min db 30h
	sec db 30h
.code
	...
	...
	mov ch,hour
	mov cl,min
	mov dh,sec
	mov ah,2dh
	int 21h		; Sets System Time
	...
	...
	end

Output / Return Value

Entry: CH = hour CL = minute DH = second DL = 1/100 seconds
Return:
    AL = 00h successful
    FFh if invalid time, system time unchanged
Note: DOS 3.3+ also sets CMOS clock

Limitations

Alternatives / See Also

Reference