The FirstRecurringAlarmDate property returns the first date on which an alarm should ring for a recurring item.
RecurringAppointment, RecurringEvent, and RecurringTask objects
Date
Read/write
No recurring alarms will ring prior to the date specified in the FirstRecurringAlarmDate property. Applications should set this property to the current date for all new recurring items.
RecurringAppointments
RecurringEvents
RecurringTasks