I would like to have the user input a date in one datepicker, then underneath input the number of weeks between the two dates. The second datepicker will then assign that date weeks, days or years later. What I have tried: I have the two datepickers and the textbox: <datepicker x:name="Date1" ="" focusable="False" displaydate="01/01/2022" displaydatestart="01/01/2022" displaydateend="12/31/2022" istodayhighlighted="True"> <textbox x:name="Text 1" ="" tooltip="Enter the number of weeks between dates" background="AliceBlue" borderbrush="Black" borderthickness="2" textalignment="Center" horizontalalignment="Stretch"> <datepicker x:name="Date2" ="" focusable="False" displaydate="01/01/2022" displaydatestart="01/01/2022" displaydateend="12/31/2022"