using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(DateTime.UtcNow.ToString("yyyy-MM-ddThh:mm:ssZ"));

        Console.WriteLine($"{DateTime.UtcNow:yyyy-MM-ddThh:mm:ss}Z");

        //ostatecznie

            Console.WriteLine($"{DateTime.UtcNow:s}Z"); //yyyy-MM-ddThh:mm:ssZ

​

    }

}