public function __construct($items = null)
{
parent::__construct();
if (CalendarDateTime::dmy()) {
$firstName = "Day";
$firstFunc = "getDaysMap";
$secondName = "Month";
$secondFunc = "getMonthsMap";
} else {
$firstName = "Month";
$firstFunc = "getMonthsMap";
$secondName = "Day";
$secondFunc = "getDaysMap";
}
$this->addFilterField(new FieldGroup(new DropdownField('Start' . $firstName, _t('CalendarFilterFieldSet.START', 'Start'), CalendarUtil::$firstFunc()), new DropdownField('Start' . $secondName, '', CalendarUtil::$secondFunc()), new DropdownField('StartYear', '', CalendarUtil::getYearsMap())));
$this->addFilterField(new FieldGroup(new DropdownField('End' . $firstName, _t('CalendarFilterFieldSet.END', 'End'), CalendarUtil::$firstFunc()), new DropdownField('End' . $secondName, '', CalendarUtil::$secondFunc()), new DropdownField('EndYear', '', CalendarUtil::getYearsMap())));
}