use the AddYears(), AddMonths(), AddDays(), AddMinutes(), and AddSeconds() methods to add periods to a DateTime

   
 

using System;

class MainClass {

    public static void Main() {
        DateTime myDateTime9 = new DateTime(2004, 1, 1);
        Console.WriteLine("Initial myDateTime9 = " + myDateTime9);
        myDateTime9 = myDateTime9.AddYears(1);
        myDateTime9 = myDateTime9.AddMonths(5);
        myDateTime9 = myDateTime9.AddDays(3);
        myDateTime9 = myDateTime9.AddMinutes(30);
        myDateTime9 = myDateTime9.AddSeconds(15);
        Console.WriteLine("Final myDateTime9 = " + myDateTime9);

    }
}