src/Service/Driver/BaseDriver.php
public function getMax(array $params)
    {
        if (empty($params)) {
            throw new \InvalidArgumentException('Unknown key list');
        }

        foreach ($params as $key => $value) {
            if (!($value instanceof \DateTime)) {
                $params[$key] = $this->get($value);
            }
        }

        return max($params);
    }
public function getMax(array $params)
    {
        if (empty($params)) {
            throw new \InvalidArgumentException('Unknown key list');
        }

        foreach ($params as $key => $value) {
            if (!($value instanceof \DateTime)) {
                $params[$key] = $this->get($value);
            }
        }

        return max($params);
    }
Get a list of keys or dates and chooses the max date.

@param array $params

@return \DateTime