How to select control in XAML based on platform

I have the existing xaml with DatePicker and TimePicker shown below.

Because DatePicker and TimePicker are not working on macOS I have to create myMacOSDatePicker and myMacOSTimePicker.

How do I select control in the XAML based on platform, so that On "Droid, iOS, UWP" the DatePicker and TimePicker are used, but On "macOS" myMacOSDatePicker and myMacOSTimePicker are used ?

Thanks in advance
Eigil

Existing XAML: