Add time to Date in a java pgm

Add time to Date

import java.util.*;

public class Main

{

   public static void main(String[] args) throws Exception

   {

      Date d1 = new Date();

      Calendar cl = Calendar. getInstance();

      cl.setTime(d1);

      System.out.println("today is " + d1.toString());

      cl. add(Calendar.MONTH, 1);

System.out.println("date after a month will be " + cl.getTime().toString() );

      cl. add(Calendar.HOUR, 70);

     System.out.println("date after 7 hrs will be " + cl.getTime().toString() );

      cl. add(Calendar.YEAR, 3);

               System.out.println("date after 3 years will be " + cl.getTime().toString() );

   }

}