I got it...
First you edit the XAML like this:
You bind the SelectedDate property to the name of the column in the DataView that contains the date you are looking for (in this case, the column is called "estimated_delivery_date"). Then you go to the actual C# and
do a DataContext to bind the field with the DataView itself. What this does is it tells the compiler what CLR object you are binding your DatePicker field to:
dTPDateRequested.DataContext = _justificationView;
That's it! You might want to perform validations before setting the value so if the date comes as NULL, you do some validation and update field to current time, for example.