Add hours, minutes or seconds to a date in Java

/*  www .  j av a 2 s.c  om*/
import java.util.Calendar;
 
public class Main {
    public static void main(String[] args) {
        Calendar calendar = Calendar.getInstance();
        System.out.println("Original = " + calendar.getTime());
 
        // Substract 2 hour from the current time
        calendar.add(Calendar.HOUR, -2);
 
        // Add 30 minutes to the calendar time
        calendar.add(Calendar.MINUTE, 30);
 
        // Add 300 seconds to the calendar time
        calendar.add(Calendar.SECOND, 300);
        System.out.println("Updated  = " + calendar.getTime());
    }
}