GE JES1142WPC Owner's Manual page 22

About the other features.
22
Clock
(This must be set before use)
Press CLOCK and enter the time on the 00:00:00
1
format (1:00 - 12:59) .
Press CLOCK to lock in time.
2
Child Safety Lock
To activate this function, press and hold
1
STOP/CLEAR button for 3 seconds. Time on screen
will go blank and microwave will beep.
To remove the lock, press and hold STOP/CLEAR
2
button for 3 seconds.Time on screen will re-appear
and microwave will beep.