#1. "RE: Interval Shooting D7100" In response to Reply # 0 Thu 13-Jun-13 04:43 PM by elec164
If its what I think you mean, then it is clock time. And remember its format is the 24 hour clock so 10AM is 10:00 and 10PM is 22:00.
Edited to add:
Also make sure your cameras time is correct, and remember that the interval includes exposure time. So if the accumulative exposure time for the number of shots per interval exceeds the interval timer, it will reduce the number of intervals.