using System;

public class Program

{

    public static void Main()

    {

        Test($"{DateTime.Now}");

    }

    public static void Test(object o) { Console.WriteLine("object"); }

    public static void Test(string o) { Console.WriteLine("string"); }

    public static void Test(IFormattable o) { Console.WriteLine("IFormattable"); }

    // public static void Test(FormattableString o) { Console.WriteLine("FormattableString"); }

}