This function's register format is the same as that required for Int 21H Function 2CH (Get Time).Initializes the system real-time clock to a specified hour, minute, second, and hundredth of second. The system date is not affected.
Call with:
AH = 2DH
CH = hours (0 through 23)
CL = minutes (0 through 59)
DH = seconds (0 through 59)
DL = hundredths of seconds (0 through 99)
Returns:
AL = 00H if time set successfully
FFH if time not valid (ignored)
Note:
This function's register format is the same as that required for Int 21H Function 2CH (Get Time).
Example:
Set the system time according to the contents of the variables hours and minutes. Force the current seconds and hundredths of seconds to zero.
hours db 0
minutes db 0
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mov ah,2dh ; function number
mov ch,hours ; get hours (byte)
mov cl,minutes ; get minutes (byte)
mov dx,0 ; force seconds and
; hundredths to zero
int 21h ; transfer to MS-DOS
or al,al ; check status
jnz error ; jump if time invalid
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