ISODate时间转换

    private function formatISODate($dateTime)
    {
        $date = date("Y-m-d", strtotime($dateTime));
        $time = date("H:i:s.000", strtotime($dateTime));
        return $date . "T" . $time . "+08:00";
    }

    date('Y-m-d H:i:s', strtotime(substr($time, 0, 19)));