|TargetDatetime||Datetime to go off of.|
|RecurrenceStartDatetime||A datetime that all other recurrences go from.|
|RecurrenceIntervalLength||How long between recurrences. See More Info for format.|
Currently, the RecurrenceIntervalLength quantity must be of the form ddddThh:mm:ss, where dddd is four digits for the number of days to add or subtract, hh is two digits for the number of hours, and mm and ss are for minutes and seconds.
The recurrence interval must be positive. If you want to go in a forwardwards direction, then use