use proper message timestamp

app.js

         APP.UI.addListener(UIEvents.MESSAGE_CREATED, function (message) {
             room.sendTextMessage(message);
         });
-        room.on(ConferenceEvents.MESSAGE_RECEIVED, function (userId, text) {
-            APP.UI.addMessage(userId, getDisplayName(userId), text, Date.now());
+        room.on(ConferenceEvents.MESSAGE_RECEIVED, function (id, text, ts) {
+            APP.UI.addMessage(id, getDisplayName(id), text, ts);
         });
     }
 

lib-jitsi-meet.js

         conference.eventEmitter.emit(JitsiConferenceEvents.SETUP_FAILED);
     });
 
+    conference.room.addListener(XMPPEvents.MESSAGE_RECEIVED, function (jid, displayName, txt, myJid, ts) {
+        var id = Strophe.getResourceFromJid(jid);
+        conference.eventEmitter.emit(JitsiConferenceEvents.MESSAGE_RECEIVED, id, txt, ts);
+    });
+
     conference.rtc.addListener(RTCEvents.DOMINANTSPEAKER_CHANGED, function (id) {
         if(conference.lastActiveSpeaker !== id && conference.room) {
             conference.lastActiveSpeaker = id;