public function render()
    {
        $name = $this->getName();
        $this->registerFieldNameForFormTokenGeneration($name);

        $this->tag->addAttribute('name', $name . '[hour]');
        $date = $this->getSelectedDate();
        $this->setErrorClassAttribute();

        $content = '';
        $content .= $this->buildHourSelector($date);
        $content .= $this->buildMinuteSelector($date);
        return $content;
    }