You can modify the scheduled times by disabling Use Access Times.

Add	Adds a schedule time item to the collection. Start/Stop use DateFormat Dimension.
Deconflict	Deconflicts the schedule time intervals
RemoveAll	Removes all items in the collection.
RemoveIndex	Removes an item given an index.
RemoveSchedule	Removes an interval using the interval interface. Start/Stop use DateFormat Dimension.

Count	The number of items in the collection.
Item	Retrieves and IAgScheduleTime interface given an index.