using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        DateTime dateValue;

        if(DateTime.TryParseExact("10.13.2019", "dd.MM.yyyy", new CultureInfo("en-US"), DateTimeStyles.None, out dateValue)){

            Console.WriteLine(" String is a valid date ", dateValue.ToString());

        }

        else{

            Console.WriteLine(" String is NOT a valid date ", dateValue.ToString());

        }

    }

}