Менеджер событий (EventManager) в 1C-Битрикс

\Bitrix\Main\EventManager::getInstance()->addEventHandler(
    "iblock",
    "OnAfterIBlockElementUpdate",
    ["UpdateBulletinsElements", "onAfterIBlockElementUpdateHandler"]
);

class UpdateBulletinsElements
{
    public static function onAfterIBlockElementUpdateHandler(&$arFields)
    {
        \Bitrix\Main\Loader::includeModule('iblock'));

        // Подключаем классы внутри обработчика
        $currentDate = new \Bitrix\Main\Type\DateTime();
        $dateActiveFrom = $currentDate->toString();
        $dateActiveTo = $currentDate->add('14D')->toString();

        // Обновляем элемент инфоблока
            $el = new CIBlockElement();
            $el->Update(
                $arFields['ID'],
                [
                    'ACTIVE_FROM' => $dateActiveFrom,
                    'ACTIVE_TO' => $dateActiveTo
                ]
            );
    }
}