using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(DateTime.UtcNow.ToString("O"));

        Console.WriteLine(DateTime.UtcNow.ToString("o"));

        DateTime d2 = DateTime.Parse("2019-03-13T12:12:12.733Z", null, System.Globalization.DateTimeStyles.RoundtripKind);

        Console.WriteLine(d2.ToString("O"));

    }

}