title: Displaying time elapsed since epoch
body: <p>I am working on creating a time app that calculates both the current time and the time elapsed since midnight, January 1, 1970, in milliseconds. I went ahead and used Calendar and was able to successfully return the current time but for some reason the elapsed time returns 0. Not sure why that would be. </p>
  
  <p>Here is my current code:</p>
  
  <pre><code>import java.util.Calendar;
  import java.util.TimeZone;
  
  public class TimeApp {
    public static void main(String[] args) {
       Time time1 = new Time();
       System.out.println("Hour: " + time1.getHour() + " Minute: " +
                     time1.getMinute() + " Second: " + time1.getSecond());
  
       Time time2 = new Time();
       System.out.println("Elapsed time since epoch: " + time2.getElapsedTime());
    }
  }
  
  final class Time {
    private int hour;
    private int minute;
    private int second;
    private long secondsSinceEpoch;
  
    public Time() {
      Calendar calendar = Calendar.getInstance();
      this.second = calendar.get(Calendar.SECOND);
      this.minute = calendar.get(Calendar.MINUTE);
      this.hour = calendar.get(Calendar.HOUR_OF_DAY);
    }
  
    public Time(long elapsedTime) {
      Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
      calendar.clear();
      calendar.set(2016, Calendar.SEPTEMBER, 9);
      secondsSinceEpoch = calendar.getTimeInMillis() / 1000L;
    }
  
  @Override
     public String toString() {
       return hour + ":" + minute + ":" + second;
    }
  
    public int getHour() {
       return hour;
    }
  
    public int getMinute() {
       return minute;
    }
  
    public int getSecond() {
       return second;    
    }
  
    public long getElapsedTime() {
     return secondsSinceEpoch;
    }
  }
  </code></pre>