Hi @Anonymous ,
I did a test for you:
1\ Add a DatePicker control 'DatePicker1' and set its onchange property to:
If(Weekday(DatePicker1.SelectedDate)=1,Set(VarDate,DateAdd(DatePicker1.SelectedDate,1,Days)),Weekday(DatePicker1.SelectedDate)=7,Set(VarDate,DateAdd(DatePicker1.SelectedDate,2,Days)),Set(VarDate,DatePicker1.SelectedDate));Reset(DatePicker1)
2\ Set the DatePicker control's DefaultDate property to:
VarDate
3\ The result is as follows:

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.