java program date difference in second

java program to find difference between two date in seconds

import java.util.Calendar;
import java.util.Date;

public class DateDifferenceDemo {

 public static void main(String[] args) {
  
  Calendar calender1 = Calendar.getInstance();
  calender1.set(Calendar.DAY_OF_MONTH, 12);
  calender1.set(Calendar.MONTH, 12);
  calender1.set(Calendar.YEAR, 2019);
  calender1.set(Calendar.SECOND,10);
  
  
  Calendar calender2 = Calendar.getInstance();
  calender2.set(Calendar.DAY_OF_MONTH, 12);
  calender2.set(Calendar.MONTH, 12);
  calender2.set(Calendar.YEAR, 2019);
  calender2.set(Calendar.SECOND,30);
  
  Date date1 = calender1.getTime();
  Date date2 = calender2.getTime();
  
  long milliSeconds = date2.getTime() - date1.getTime();
  System.out.println("Date Time difference in milli seconds : " +  milliSeconds);
  System.out.println("Date Time difference in seconds : " +  milliSeconds/1000l);
 }
}

Output :

Date Time difference in milli seconds : 20026
Date Time difference in seconds : 20