using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        DateTime now = new DateTime(2020, 05, 20);

        // se va folosi implicit cultura CultureInfo.CurrentCulture

        // la mine fiind instalata cultura en-US se va afisa: 05/20/2020 00:00:00

        Console.WriteLine($"{now}");

        // am specificat explicit cultura ro-RO (limba romana, Romania)

        // se afiseaza: 20.05.2020 00:00:00

        FormattableString nowStr1 =  $"{now}";

        Console.WriteLine(nowStr1.ToString(new CultureInfo("ro-RO")));

        // am specificat explicit un format, cultura se ca considera implicit CultureInfo.CurrentCulture

        // se afiseaza: 20.May.2020

        Console.WriteLine($"{now:dd.MMMM.yyyy}");

        // am specificat explicit un format si o cultura

        // se afiseaza: 20.mai.2020

        FormattableString nowStr2 =  $"{now:dd.MMMM.yyyy}";

        Console.WriteLine(nowStr2.ToString(new CultureInfo("ro-RO")));

        // am specificat explicit cultura curenta

        // se afiseaza: 20.May.2020

        Console.WriteLine(FormattableString.CurrentCulture($"{now:dd.MMMM.yyyy}"));

        // am specificat explicit cultura invarianta

        // se afiseaza: 20.May.2020

        Console.WriteLine(FormattableString.Invariant($"{now:dd.MMMM.yyyy}"));

    }

}