function print_date_element($label, $params, $required = false, $info_text = null)
{
    if (empty($params['class'])) {
        $params['class'] = 'date_input';
    } else {
        $params['class'] .= ' date_input';
    }
    $element = new form_element_input($label, $params, $required, $info_text);
    echo $element->get_html();
}
function print_datetime_element($params)
{
    if (empty($params['classes'])) {
        $params['classes'] = array('datetime_input');
    } else {
        $params['classes'][] = 'datetime_input';
    }
    $element = new form_element_input($params);
    echo $element->get_html();
}