// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002410/int32-hosttonetworkorder

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        Int32  input = 57;

        // C# Extension Method: Int32 - HostToNetworkOrder

        Int32  output = input.HostToNetworkOrder();

        var dayOfYear = DateTime.Now.DayOfYear.ToString("000");

        var str = DateTime.Now.ToString("yyyy'-'{0}'T'HH':'mm':'ss.fffffff") + "000Z";

        Console.WriteLine(str,dayOfYear);

    }

}