using System;

using System.Globalization;

using System.Threading;

using static System.FormattableString;

​

public class Program

{

    public static void Main()

    {

        Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("de-DE");

        Console.WriteLine($"Regular:   {DateTime.UtcNow}");

        Console.WriteLine(Invariant($"Invariant: {DateTime.UtcNow}"));

​

    }

}