Hi Lee,
Thanks for contacting Syncfusion Support.
We can access selected date for single selection and selected dates for rangeSelection by using SelectionChanged event and we have already fixed the reported issue "Accessing Selected date for Single Selection and Selected Dates for RangeSelection in SelectionChangedEvent" for internally. This fix will be available our upcoming volume 2 release which will be available by the mid of April.
If you wish to receive a patch for this prior to the public release date, please contact our sales team at salessupport@syncfusion.com.
Regards,
Rathanakumar S.