Method getCalendar

/**
 * Getter for the calendar type
 *
 * @return  string  The calendar type.
 *
 * @since   3.7.0
 */
public function getCalendar()
{
    if (isset($this->metadata['calendar'])) {
        return $this->metadata['calendar'];
    } else {
        return 'gregorian';
    }
}