using System;

public class Program

{

    public static void Main()

    {

        System.Globalization.CultureInfo enGB = new System.Globalization.CultureInfo("en-GB");

        var str1 = Convert.ToString(DateTime.MaxValue, enGB);

        Console.WriteLine(str1);

        System.Globalization.CultureInfo enUS = new System.Globalization.CultureInfo("en-US");

        var str2 = Convert.ToString(DateTime.MaxValue, enUS);

        Console.WriteLine(str2);

    }

}