title: Show Countdown timer in HH:MM:SS (Hours : Minutes : Seconds)
body: <p>I want to display <code>count down timer</code> in <code>HH:MM:SS</code> format..
  I tried many things but none worked</p>
  
  <pre><code>@Override
      public void onTick(long millisUntilFinish) {
  
          long millis = millisUntilFinish;
  
          String ms = String.format("%02d:%02d:%02d", millis / 3600,
                  (millis % 3600) / 60, (millis % 60));
  
          tapHere.setText(ms);
      }
  </code></pre>