GtkCalendar::select_day

select_day() specifies the day number that will be selected (i.e. highlighted).

Note that if there are no further instructions, the same day will be highlighted throughout the months and years in the calendar.

The default selected day is 1, with the range being 1 to 31. Selecting an impossible day within that range - e.g. February 30th - does not return an error message, as the day number is not associated with the month and year information in this method.