using System;

​

public class Program

{

    public static void Main()

    {

        //4th August 2021, 23:58:30:999 (hours:minutes:seconds:milliseconds)

        var mydate = new DateTime(2021, 8, 4, 23, 58, 30, 999);

        Console.WriteLine(mydate.ToString("MM/dd/yy")); // 08/4/21

        Console.WriteLine(mydate.ToString("MM/dd/yyyy")); //08/04/2021

        Console.WriteLine(mydate.ToString("dd/MM/yy")); //04/08/21

        Console.WriteLine(mydate.ToString("dd-MM-yy")); //04-08-21

        Console.WriteLine(mydate.ToString("ddd, dd MMM yyyy")); // Wed, 04 Aug 2021

        Console.WriteLine(mydate.ToString("dddd, dd MMMM yy")); // Wednesday, 04 August 21

        Console.WriteLine(mydate.ToString("dddd, dd MMMM yyyy HH:mm")); // Wednesday, 04 August 2021 23:58

        Console.WriteLine(mydate.ToString("MM/dd/yy HH:mm")); // 08/04/21 23:58

        Console.WriteLine(mydate.ToString("MM/dd/yyyy hh:mm tt")); // 08/04/2021 11:58 PM

        Console.WriteLine(mydate.ToString("MM/dd/yyyy H:mm t")); // Wed, 04 Aug 2021 P

        Console.WriteLine(mydate.ToString("MM/dd/yyyy H:mm:ss")); // 08/04/2021 23:58:30

        Console.WriteLine(mydate.ToString("MMM dd")); // Aug 04

        Console.WriteLine(mydate.ToString("MM-dd-yyyTHH:mm:ss.fff")); // 08-04-2021T23:58:30.999

        Console.WriteLine(mydate.ToString("MM-dd-yyy g")); // 08-04-2021 A.D.

        Console.WriteLine(mydate.ToString("HH:mm")); // 23:58

        Console.WriteLine(mydate.ToString("hh:mm tt")); // 11:58 PM

        Console.WriteLine(mydate.ToString("HH:mm:ss")); // 23:58:30

        Console.WriteLine(mydate.ToString("'Full DateTime:' MM-dd-yyyTHH:mm:ss")); // Full DateTime: 08-04-2021T23:58:30

    }

}