The Alarm Clock feature did not ring at the scheduled time. Why not?
Check to see if the ALARM CLOCK settings are set appropriately. When setting alarm clock, the SNOOZE, ALARM SOUND, and volume options require that the OK/FUNC button be pushed twice. If the button were only pushed once for any of these settings, then the settings would not have been set. Check to see if DUALTIME is set to ON. If it is, the alarm clock will sound according to the date and time settings of DUALTIME, not to the camera default date and time.