import java.util.Calendar; public class Main { public static void main(String[] args) { Calendar now = Calendar.getInstance(); System.out.println("Current Date : " + (now.get(Calendar.MONTH) + 1) + "-" + now.get(Calendar.DATE) + "-" + now.get(Calendar.YEAR)); System.out.println("Current time : " + now.get(Calendar.HOUR_OF_DAY) + ":" + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND)); now = Calendar.getInstance(); now.add(Calendar.HOUR, -3); System.out.println("Time before 3 hours : " + now.get(Calendar.HOUR_OF_DAY) + ":" + now.get(Calendar.MINUTE) + ":" + now.get(Calendar.SECOND)); } }