<DatePicker x:Name="datePickerCtl" Width="200" Height="25"
SelectedDateFormat="Long" FirstDayOfWeek="Monday"
DisplayDateStart="2020/1/1" DisplayDateEnd="2020/1/20"
IsTodayHighlighted="False">
<DatePicker.BlackoutDates>
<CalendarDateRange Start="2020/1/3" End="2020/2/5"/>
<CalendarDateRange Start="2020/1/10" End="2020/2/6"/>
</DatePicker.BlackoutDates>
</DatePicker>