private function reset()
    {
        $time = new \DateTime();
        $this->driver->set(self::LAST_UPDATE_KEY, $time);

        return $time;
    }
private function reset()
    {
        $time = new \DateTime();
        $this->driver->set(self::LAST_UPDATE_KEY, $time);

        return $time;
    }
Reset last update date.

@return \DateTime