var sess = wialon.core.Session.getInstance(); // get instance of current Session
            // flags to specify what kind of data should be returned
            var flags = wialon.item.Item.dataFlag.base | wialon.item.Unit.dataFlag.lastMessage | wialon.item.Unit.dataFlag.restricted;
            sess.updateDataFlags(// load items to current session
                    [{type: "type", data: "avl_unit", flags: flags, mode: 0}], // Items specification
                    function (code) { // updateDataFlags callback
                        if (code) {
                            msg(wialon.core.Errors.getErrorText(code));
                            return;
                        } // exit if error code
                        // append option to select
                        var info = wialon.core.Session.getInstance().getItem("<?php echo $id; ?>"); // get unit by id
                        var pos = info.getPosition();
                        var uniqueid = info.getUniqueId();
                        var phonenumber = info.getPhoneNumber();
                        var time = wialon.util.DateTime.formatTime(pos.t);
                        var now = new Date(); // Conseguimos los datos de Ahora
                        var nowyear = now.getYear();
                        var nowmonth = now.getMonth();
                        var nowday = now.getDay();  // Que dia estamos
                        var nowhour = now.getHours();  // Hora actual
                        var nowminute = now.getMinutes(); // Minuto actual
                        var nowsecond = now.getSeconds();  // Segundo actual
                        var tiempo1 = new Date(nowyear, nowmonth, nowday, 0, 0, 0, 0);
                        var tiempo2 = new Date(nowyear, nowmonth, nowday, nowhour, nowminute, nowsecond, 0);
                        var dif = tiempo1.getTime() - tiempo2.getTime();

                        var Segundos_de_T1_a_T2 = dif / 1000;
                        var Segundos_entre_fechas = Math.abs(Segundos_de_T1_a_T2);
                        $("#unitlist").append("<p>P " + info.getName() + "    " + phonenumber + "    " + uniqueid + "    " + "<?php echo $id; ?>" + "  "+ Segundos_entre_fechas +"  " + pos.x + "    " + pos.y + "    " + pos.s + "</p>");

                    }
            );
        }