using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        var now = DateTime.Now;

        var nowUtc = DateTime.UtcNow;

        var unspecified = DateTime.SpecifyKind(DateTime.Now, DateTimeKind.Unspecified);

        Console.WriteLine(now.ToString("s", CultureInfo.InvariantCulture));

        Console.WriteLine(now.ToString("O", CultureInfo.InvariantCulture));

        Console.WriteLine(nowUtc.ToString("s", CultureInfo.InvariantCulture));

        Console.WriteLine(nowUtc.ToString("O", CultureInfo.InvariantCulture));

        Console.WriteLine(unspecified.ToString("s", CultureInfo.InvariantCulture));

        Console.WriteLine(unspecified.ToString("O", CultureInfo.InvariantCulture));

    }

}