title: how to date time in java
body: <p>I have this code:</p>
  
  <pre><code>Date dt = new Date(100000000000L);
  DateFormat[] dtformat = new DateFormat[6];
  dtformat[0] = DateFormat.getInstance();
  dtformat[1] = DateFormat.getDateInstance();
  dtformat[2] = DateFormat.getDateInstance(DateFormat.MEDIUM);
  dtformat[3] = DateFormat.getDateInstance(DateFormat.FULL);
  dtformat[4] = DateFormat.getDateInstance(DateFormat.LONG);
  dtformat[5] = DateFormat.getDateInstance(DateFormat.SHORT);
  for(DateFormat dateform : dtformat)
     System.out.println(dateform.format(dt));
  </code></pre>
  
  <p>I don't know what is the meaning of this code (the <code>100000000000L</code>) function:</p>
  
  <pre><code> Date dt = new Date(100000000000L);
   DateFormat[] dtformat = new DateFormat[6];
  </code></pre>
  
  <p>Can someone tell me? Because I want to replace the time to the 24 July 1998</p>