// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002346/double-frommilliseconds

​

// @nuget: Z.ExtensionMethods

​

using System;

public class Program

{

    public static void Main()

    {

        double[] values = { 1, 24, 3600, 123456789.8, 1234567898765.4, 10000000, 600000000000, 889944220000 };

​

        Console.WriteLine("{0,21}{1,18}","FromMilliseconds", "TimeSpan");

        Console.WriteLine("{0,21}{1,18}","--------", "--------");

​

        foreach (double value in values)

        {

            // C# Extension Method: Double - FromMilliseconds

            TimeSpan interval = value.FromMilliseconds();

            string timeInterval = interval.ToString();

​

            int pIndex = timeInterval.IndexOf(':');

            pIndex = timeInterval.IndexOf('.', pIndex);

            if (pIndex < 0) timeInterval += "        ";

​

            Console.WriteLine("{0,21}{1,26}", value, timeInterval);

        }

    }

}