The WCalendar widget provides navigation by month and year, and indicates the current day.
You can select multiple dates after passing the flag ExtendedSelection to the method setSelectionMode().
The WDateEdit widget is a line edit with support for date entry, using a WCalendar in a popup for editing the date. In the future, it is foreseen that this widget can evolve to use browser support for easy date entry.
By default the selected date is shown in the format defined by your WLocale settings as in the first example. In the second example the format is set to "dd MM yyyy".
The WTimeEdit widget is a line edit with support for time entry.