Thank you for the attached picture.
In order to achieve the desired requirement you can use a DayButtonStyleSelector
. You don't have to apply any style, since the goal is just to add a zero in front of the days before 10th. Still if you have any custom styles, you can apply them as well. Here is how that would look:
DayButtonStyleSelector : StyleSelector
item, DependencyObject container)
CalendarButtonContent calendarButton = item
(calendarButton.ButtonType == CalendarButtonType.Date)
calendarButton.Text = calendarButton.Text.PadLeft(2,
You would also need to define the StyleSelector in xaml and set in on the RadCalendar.
Hope this helps.