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ok donc la on est dans le controller AdminOrdersController on a recup les deux variables donc on peux faire la requete d'update comme ceci

 /* Modif Alex */
    public function ajaxProcessupdateDateLivProd()
    {
        $id_order_detail = Tools::getValue('id_order_detail');

        $date_liv = Tools::getValue('date_liv');

        $sql= Db::getInstance()->execute('UPDATE `'._DB_PREFIX_.'order_date_liv` odl
                SET odl.Date = '.$date_liv .'
                WHERE `id_order_detail` = '.$id_order_detail ;

       return $sql;

    }
    /* Modif Alex */

cdt