Camroncade\Timezone\Timezone::convertToUTC PHP Method

    public function convertToUTC($timestamp, $timezone, $format = 'Y-m-d H:i:s')
    {
        $date = new DateTime($timestamp, new DateTimeZone($timezone));
        $date->setTimezone(new DateTimeZone('UTC'));
        return $date->format($format);
    }