entById('label_iso_8601'),
                            dp_iso_8601.getDate().toIsoString(true));

    // Custom
    var dp_custom = new goog.ui.DatePicker(new goog.date.Date(2006, 0, 1));
    dp_custom.render(document.getElementById('widget_custom'));

    goog.events.listen(dp_custom, goog.ui.DatePicker.Events.CHANGE,
                       function(event) {
      goog.dom.setTextContent(document.getElementById('label_custom'),
          event.date ?
          event.date.toIsoString(true) : 'none');
    })