using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var str = DateTime.UtcNow.ToString("o");

        Console.WriteLine(str);

        var date = DateTime.ParseExact(str, "o", CultureInfo.InvariantCulture);

        Console.WriteLine(date.ToUniversalTime().ToString("o"));

    }

}