To get the first date in selected date range, use the 'SelectionStart'
property and to get the last date use the 'SelectionEnd' property. If you
don't want to allow the user to select a range (i.e. only a single date at a
time) then set the 'MaxSelectionCount' property to 1 and then use either the
'SelectionStart' or 'SelectionEnd' properties to get the selected date.