text: #include <Wt/Ext/Calendar>
  A calendar.
  The calendar provides navigation by month and year, and indicates the current day.
  The calendar only allows selection of a single day, and you may listen for when the user selects a new date using the selected() signal.
  The API is a subset of the WCalendar API:
  Here is a snapshot taken on 01/09/2007 (shown as today), and 12/09/2007 currently selected.
  Create a new calendar.
  Constructs a new calendar, with optional support for internationalization. The calendar shows the current day, and has an empty selection.
  Select a date.
  Select one date.
  Signal emitted when the user has selected a date.
  This signal indicates that the user has selected a new date, which is only available when in single selection mode.
  Get the current selection.
  Returns the set of dates currently selected. This set contains 0 or 1 dates.
  Signal emitted when the user changes the selection.
  Emitted after the user has changed the current selection, before the selected() signal is emitted.