src/Service/Keeper.php
public function get($key)
    {
        if (!($time = $this->driver->get($key))) {
            if ($key == self::LAST_UPDATE_KEY) {
                $time = $this->reset();
            } else {
                $time = $this->get(self::LAST_UPDATE_KEY);
            }
        }

        return $time;
    }
public function get($key)
    {
        if (!($time = $this->driver->get($key))) {
            if ($key == self::LAST_UPDATE_KEY) {
                $time = $this->reset();
            } else {
                $time = $this->get(self::LAST_UPDATE_KEY);
            }
        }

        return $time;
    }
Get time for key.

@param string $key

@return \DateTime