use the overloaded subtraction operator (-) to subtract a TimeSpan from a DateTime

   
 

using System;

class MainClass {

    public static void Main() {
        TimeSpan myTimeSpan = new TimeSpan(1, 2, 4, 10);
        DateTime myDateTime6 = DateTime.Parse("1/13/2004 23:10:30");

        DateTime myDateTime8 = myDateTime6 - myTimeSpan;
        Console.WriteLine("myDateTime6 - myTimeSpan = " + myDateTime8);
    }
}