I am investigating the work involved to extend the current Calendar recurring days functionality. The functionality needs to be extended so that a calendar event may be selected to occur: Every day, week, month or year. Daily (every x days or every weekday) Weekly (every x weeks on y day e.g. every third monday) Monthly (every day x of y months) And the ability to set a recurrence range (e.g. Every Monday for 3 weeks). Has anyone done anything along these lines and could give me some information?