The property you are looking for is Date.
If you have your DatePicker in your XAML, like this
<DatePicker x:Name="DatePicker" />
And want to access the date in the code, you can do it like this
var date = this.DatePicker.Date;
You can also listen for a DateChanged event like this
this.DatePicker.DateChanged += (o, e) => { var changedDate = e.NewDate; };
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