using System;

using Microsoft.Extensions.Primitives;

​

​

public static class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine( new DateTime().ToString( "MMMM" ) );

        Test( 1, 0, 0, 0);

        Test( 1, 2, 0, 0);

        Test( 1, 20, 30, 0);

        Test( 1, 20, 30, 40);

        Test( 1, 23, 0, 0);

        Test( 1, 23, 30, 0);

        Test( 1, 23, 59, 0);

        Test( 1, 23, 59, 59);

        Console.WriteLine( "------");

​

​

        Test( 0, 0, 0, 0);

        Test( 0, 2, 0, 0);

        Test( 0, 20, 30, 0);

        Test( 0, 20, 30, 40);

        Test( 0, 23, 0, 0);

        Test( 0, 23, 30, 0);

        Test( 0, 23, 59, 0);

        Test( 0, 23, 59, 59);

        Console.WriteLine( "------");

​

        Test( 0, 0, 0, 0);

        Test( 0, 7, 59, 59);

        Test( 0, 0, 30, 0);

        Test( 0, 0, 30, 40);

        Test( 0, 0, 0, 0);

        Test( 0, 0, 30, 0);

        Test( 0, 0, 59, 0);

        Test( 0, 0, 59, 59);

        Console.WriteLine( "------");

​

​

    }

    private static void Test( int d, int h, int m, int s )

    {

        var seconds = d * 24 * 3600 + h * 3600 + m * 60 + s;

        var text = SecondsTo_DHMS(seconds);

        Console.WriteLine( $"{d}d {h}:{m,2}:{s,2}   -> {text}");

    }

​

​

​

            public static string SecondsTo_DHMS(this int duration)

        {

            string timeText;

            var    d = duration / (24 * 60 * 60);

            var    h = (duration % (24 * 60 * 60)) / 3600;

            var    m = (duration % 3600) / 60;

            var    s = duration % 60;

            if (d > 0)

            {

                if (h == 23)

                {

                    d++;

                    h = 0;

                }

                timeText = h > 0 ? string.Format(P0_D_P1_H, d, m > 0 ? h + 1 : h) : string.Format(P0_D, d);

            }

            else if (h > 0)

            {

                if (m == 59)

                {

                    h++;

                    m = 0;

                    s = 0;

                }

                timeText = m > 0 ? string.Format(P0_H_P1_M, h, s > 0 ? m + 1 : m) : string.Format(P0_H, h);

            }

            else if (m > 0)

            {

                timeText = s > 0 ? string.Format(P0_M_P1_S, m, s) : string.Format(P0_M, m);

            }

            else

            {

                timeText = string.Format(P0_Secs, Math.Max(0, s));

            }

​

            return timeText;

        }

​

​

​

        const string P0_Days = "{0} days";

​

        const string P0_Hours = "{0} hours";

​

        const string P0_Minutes = "{0} minutes";

​

        const string P0_Days_P1_Hours = "{0} days {1} hours";

​

        const string P0_Hours_P1_Minutes = "{0} hours {1} minutes";

​

        const string P0_Minutes_P1_Seconds = "{0} minutes {1} seconds";

​

        const string P0_Seconds = "{0} seconds";

​

        const string P0_D = "{0}d";

​

        const string P0_H = "{0}h";

​

        const string P0_M = "{0} min";

​

        const string P0_Secs = "{0} secs";

​

        const string P0_D_P1_H = "{0}d {1}h";

​

        const string P0_H_P1_M = "{0}h {1}min";

​

        const string P0_M_P1_S = "{0}m {1}s";

​

}