The timer doesn't know what time it is until you set current time.
The yellow outlets are controlled for 12 hours, and you can determine when those hours occur when setting current time.
http://waterheatertimer.org/GE-timers-and-manuals.html#zilla
If you want timer to control one lamp with both day and night schedules,
you have to adjust current time setting so lamp schedule falls within a
12 hour period. If that schedule doesn't fit, then buy a second timer.
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