src/HTTP/Request2/CookieJar.php
protected function now()
    {
        $dt = new DateTime();
        $dt->setTimezone(new DateTimeZone('UTC'));
        return $dt->format(DateTime::ISO8601);
    }
protected function now()
    {
        $dt = new DateTime();
        $dt->setTimezone(new DateTimeZone('UTC'));
        return $dt->format(DateTime::ISO8601);
    }
Returns current time formatted in ISO-8601 at UTC timezone

@return string