Question

I have an Android application sending via TCP sockets to another Android phone or PC, I want to synch the clock of sender and receiver clocks. I have tried SystemClock.setCurrentTimeMillis on android but it’s not working even using the permission android.permission.SET_TIME.
is there another way?

Answer 1

Unfortunately you can’t change the time of your android phone from code,as you don’t have the privilege of setting android.permission.SET_TIME.You could do it only on a rooted phone.

So why not let your both application update from a trusted source like internet time.
Maybe use android sntp client

 //Sample usage:
 SntpClient client = new SntpClient();
 if (client.requestTime("time.nist.gov")) {
    long now = client.getNtpTime() + SystemClock.elapsedRealtime() -    client.getNtpTimeReference();
  }

OR what you can do is: send the current time on your phone to the pc and set the time of your pc,via what program you are using to recieve data.
Also take a look here: set mobile time and date