Dates, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var start = new DateTime(2020, 05, 08, 09, 00, 00);
            var end = new DateTime(2020, 05, 07, 12, 00, 00);
            
            while (start <= end)
            {
                Console.WriteLine(GetBusinessDays(start, end));
                start = start.AddDays(1);
            }
        }

public static double GetBusinessDays(DateTime startD, DateTime endD)
        {
            while (IsWeekend(startD))
                startD = startD.Date.AddDays(1);

while (IsWeekend(endD))
                endD = endD.Date.AddTicks(-1);

var bussDays = (endD - startD).TotalDays -
                (2 * ((int)(endD - startD).TotalDays / 7)) -
                (startD.DayOfWeek > endD.DayOfWeek ? 2 : 0);

return bussDays;
        }

public static bool IsWeekend(DateTime d)
        {
            return d.DayOfWeek == DayOfWeek.Saturday || d.DayOfWeek == DayOfWeek.Sunday;
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,11 sec, cpu time: 0,09 sec, average memory usage: 12 Mb, average nr of threads: 2, absolute service time: 0,28 sec

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