using System;

public class Program

{

    public static void Main()

    {

        try{

            DateTime.Parse("31/12/2100");

        }catch(FormatException ex){

            Console.WriteLine("Exception thrown: " +ex);

        }

        var a = DateTime.ParseExact("31/12/2100","dd/MM/yyyy", System.Globalization.CultureInfo.InvariantCulture);

        Console.WriteLine(a.ToString());

    }

}