Random example on Format

 DayOfWeek today = DayOfWeek.Thursday;
            string[] format = { "g", "f", "D", "x" }; //Format String can be only "G", "g", "X", "x", "F", "f", "D" or "d".
            foreach (string item in format)
            {
                Console.WriteLine(today.ToString(item));
            }
            Console.ReadKey();