property Calendar.SelectDate (Index as Long) as Date
Retrieves the selected date, given its index into selected dates collection. Use SelCount in order to get the count of selected dates.

TypeDescription
Index as Long A long expression that indicates the index of the date into selected dates collection.
Date A DATE expression that indicates the selected date

If the SingleSel property is False, use the SelCount and SelectDate properties to enumerate the selected dates. Use the UnSelDate property  to unselect a date. Use the FocusDate property to specify the date that has the focus.