if (isset($params['time']) && is_array($params['time'])) {
        if (isset($params['time'][$prefix . 'Year'])) {
            // $_REQUEST[$field_array] given
            foreach (array('Y' => 'Year',  'm' => 'Month', 'd' => 'Day') as $_elementKey => $_elementName) {
                $_variableName = '_' . strtolower($_elementName);