GE JB988KHCC Owner's Manual page 30

Special features of your oven control.
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12-Hour, 24-Hour or Clock Blackout
Your control is set to use a 12-hour clock.
If you would prefer to have a 24-hour
military time clock or black out the clock
display, follow the steps below.
Touch the BROIL HI/LO and BAKE
pads at the same time until the
display shows SF.
Touch the CLOCK pad once. The
display will show 12 hr. If this is
the choice you want, touch the
START pad.
Touch the CLOCK pad again to change
to the 24 hour military time clock. The
display will show 24 hr. If this is the choice
you want, touch the START pad.
Touch the CLOCK pad again to black out
the clock display. The display will show
OFF. If this is the choice you want, touch
the START pad.
NOTE: If the clock is in the black-out mode you
will not be able to use the Delay Start function.