using System;
using System.Linq;
public class Demo {
public static void Main() {
DateTime date1 = new DateTime(2018, 8, 11, 08, 15, 20);
DateTime date2 = new DateTime(2018, 8, 11, 11, 14, 25);
TimeSpan ts = date2 - date1;
Console.WriteLine("No. of Seconds (Difference) = {0}", ts.TotalMilliseconds);
}
}