title: Display days, hours... that have past since a date in Android (Chronometer)
body: <p>I have made a Countdown to a future date (with remaining days, hours, minutes, seconds) using CountDownTimer and lots of code from this answer: <a href="https://stackoverflow.com/a/32773716/3984944">https://stackoverflow.com/a/32773716/3984944</a>
  Now I want to do exactly the same but counting up from a past date. My TextView should refresh every second and show the elapsed time.<br>
  <br><strong>What I tried:</strong><br>
  I tried manipulating the CountDownTimer so that it works in reverse order. Changing the interval to -1000 or adding 2000 milliseconds to the Countdown every second. Both didn't work.<br>
  Then I figured I should use the Chronometer class. The standard Chronometer only displays hours, minutes and seconds as far as I'm concerned. So no days. I then wrote the following code in the style of the CountDownTimer answer I found before that updates a TextView with the desired data:</p>
  
  <pre><code>    final Chronometer ch = (Chronometer) findViewById(R.id.ch_chronometer);
      final TextView tv = (TextView) findViewById(R.id.tv_show_stopwatch);
  
      ch.setBase(endMillis); //endMillis is the date in Milliseconds
  
      chCountdownSince.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener() {
          public void onChronometerTick(Chronometer cArg) {
              long t = System.currentTimeMillis() - chCountdownSince.getBase();
  
              long days = TimeUnit.MILLISECONDS.toDays(t);
              t -= TimeUnit.DAYS.toMillis(days);
  
              long hours = TimeUnit.MILLISECONDS.toHours(t);
              t -= TimeUnit.HOURS.toMillis(hours);
  
              long minutes = TimeUnit.MILLISECONDS.toMinutes(t);
              t -= TimeUnit.MINUTES.toMillis(minutes);
  
              long seconds = TimeUnit.MILLISECONDS.toSeconds(t);
              String stopwatchDisplay = "Days: %d Hours: %d Minutes: %d Seconds: %d";
              stopwatchDisplay = String.format(stopwatchDisplay, days, hours, minutes, seconds);
              tv.setText(stopwatchDisplay);
          }
      });
  </code></pre>
  
  <p>I feel like this snipped makes absolute sense but upon execution it doesn't change my TextView at all. I feel like this is just not how Chronometer works but I don't know what I'm doing wrong. </p>