Sets the daily start time-of-day, hour and minute, at which a recurring periodic time-range window begins, on each day selected by hh3cTrangePeriodicDayOfWeek. Because it is a time-of-day rather than a full date, it lets admins express recurring schedules like every selected day starting at 9 AM instead of one-off dates. Setting hh3cTrangePeriodicStartTime to 09:00:0,0 alongside weekday bits set would make the schedule begin every weekday morning at 9 AM.