javascript - Firebase.ServerValue.TIMESTAMP not synched between listeners and the client that actually adds data

Question

Here is the simplest example possible:

var fb = new Firebase('https://xxxxxxxxxxx.firebaseio.com/test');

fb.limitToLast(1).on('child_added', function(snap) {
    console.log('key', snap.key());
    console.log('val', snap.val());
});

fb.push({
    date_now: Firebase.ServerValue.TIMESTAMP
});

If I open two tabs with this script, the one that actually pushes data gets local timestamp in child_added callback and the other tab that just listens gets proper server-generated one. As far as I understand it's done to exclude round-trip and save bandwidth.

But for my task this behaviour is unacceptable. How can I overcome it?

This is the console.log from pusher:

key -K59mrvEUhTaoNIQQoA4
val Object {date_now: 1449732570832}

and listeners (equals to server data seen in dashboard):

key -K59mrvEUhTaoNIQQoA4
val Object {date_now: 1449732571759}

Answer 1

Waitting for answers