How to get date in chatting application,

Question

If I will take date from the system (local date in UTC) then, the problem occurs when the user changes the date, if I will use server date time then I can not able to send a message when I am offline, this application is developed in android using firebase real-time DB

use ServerValue.TIMESTAMP – Ashvin solanki Mar 25 '19 at 13:41 — Ashvin solanki, Mar 25 '19 at 13:41
did you solve your problem? – Ashvin solanki Mar 26 '19 at 06:19 — Ashvin solanki, Mar 26 '19 at 06:19
no i have implemented this before but not working – Jignesh Mar 26 '19 at 06:38 — Jignesh, Mar 26 '19 at 06:38
not working ? any errors – Ashvin solanki Mar 26 '19 at 06:50 — Ashvin solanki, Mar 26 '19 at 06:50

Ashvin solanki · Answer 1 · 2019-03-26T06:23:49.703

`ServerValue.TIMESTAMP`

public static final Map<String, String> TIMESTAMP

Also: Google Play services

A placeholder value for auto-populating the current timestamp (time since the Unix epoch, in milliseconds) by the Firebase Database servers.

Example

Ref : https://stackoverflow.com/a/37868163/9909365

ref.addValueEventListener(new ValueEventListener() {
    public void onDataChange(DataSnapshot dataSnapshot) {
        System.out.println(dataSnapshot.getValue()); 
    }

    public void onCancelled(DatabaseError databaseError) { }
});
ref.setValue(ServerValue.TIMESTAMP);

Extra

`Handling Latency`

Server Timestamps

The Firebase Realtime Database servers provide a mechanism to insert timestamps generated on the server as data. This feature, combined with onDisconnect, provides an easy way to reliably make note of the time at which a Realtime Database client disconnected:

//Java
DatabaseReference userLastOnlineRef = FirebaseDatabase.getInstance().getReference("users/joe/lastOnline");
userLastOnlineRef.onDisconnect().setValue(ServerValue.TIMESTAMP);


//Kotlin
val userLastOnlineRef = FirebaseDatabase.getInstance().getReference("users/joe/lastOnline")
userLastOnlineRef.onDisconnect().setValue(ServerValue.TIMESTAMP)

How to get date in chatting application,

1 Answers1

ServerValue.TIMESTAMP

Handling Latency

`ServerValue.TIMESTAMP`

`Handling Latency`