Telerik UI for Windows Phone by Progress

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

      <telerikInput:RadTimePicker x:Name="radTimePicker" MinValue="3:00
PM" MaxValue="11:00
PM" />

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

Time Picker-Min Max Value-01