title: Android : Difference from two date and time
body: <p>I wolud like to know the difference in milliseconds within two date and time, I use the code below but it add 1 hour more is the TimeZone but on my phone is set to automatically timezone.... :</p>
  
  <pre><code>@Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      tempo_text = (TextView)findViewById(R.id.tempo_textv);
      Date data = new Date();
      long oggi = data.getTime();
      long finish = Delay(12,30, 18, 04, 2012);
      new TempoIndietro(finish-oggi,1000).start();
  }
  
  public class TempoIndietro extends CountDownTimer{
  
      public TempoIndietro(long millisInFuture, long countDownInterval) {
          super(millisInFuture, countDownInterval);   
      }
  
      @Override
      public void onFinish() {
      }
  
      @Override
      public void onTick(long millisUntilFinished) {
          SimpleDateFormat df = new SimpleDateFormat("dd : HH: mm: ss"); 
          df.setTimeZone(TimeZone.getDefault()); 
          String risultato = df.format(new Date(millisUntilFinished)); //arg0 tempo in ms preso dall'onTick
          tempo_text.setText(risultato);
  
      };
  
  }
  
  public long Delay(int mHour, int mMinute, int giorno, int mese, int anno){
      Calendar cal = Calendar.getInstance();
      cal.setTimeZone(TimeZone.getDefault());
      cal.set(Calendar.DAY_OF_MONTH, giorno);
      cal.set(Calendar.MONTH, mese);
      cal.set(Calendar.YEAR, anno);
      cal.set(Calendar.HOUR_OF_DAY, mHour);
      cal.set(Calendar.MINUTE, mMinute);
      cal.set(Calendar.SECOND, 0);
      cal.set(Calendar.MILLISECOND, 0);
      long delay = cal.getTimeInMillis();
      return delay;
  
  }
  </code></pre>