Telerik UI for Windows Phone by Progress

If you want to limit the user into choosing a date from a specific range, you can simply do it by setting the MinValue and MaxValue properties. Here is an example.

<telerikInput:RadDatePicker x:Name="radDatePicker" MaxValue="01/01/2020" MinValue="11/11/2010" />

The values that are out of range will be grayed out. Here is a snapshot.

Date Picker-Features-Min Max Values-01