public function displayVal($val, array $options = [])
    {
        $val = $this->dateTimeVal($val);
        if ($val === null) {
            return '';
        }

        if (isset($options['format'])) {
            $format = $options['format'];
        } else {
            $format = $this->format();
        }

        return $val->format($format);
    }