Hitung jumlah hari kerja antara dua tanggal?

Dalam C #, bagaimana saya bisa menghitung jumlah bisnis hari (atau hari kerja) antara dua tanggal?

Saya pernah memiliki tugas seperti itu sebelumnya dan saya punya solusinya. Saya akan menghindari menghitung semua hari di antara saat itu dapat dihindari, yang terjadi di sini. Saya bahkan tidak menyebutkan membuat banyak contoh DateTime, seperti yang saya lihat di salah satu jawaban di atas. Ini benar-benar pemborosan daya pemrosesan. Apalagi dalam situasi dunia nyata, ketika Anda harus memeriksa interval waktu beberapa bulan. Lihat kode saya, dengan komentar, di bawah.

    /// <summary>
    /// Calculates number of business days, taking into account:
    ///  - weekends (Saturdays and Sundays)
    ///  - bank holidays in the middle of the week
    /// </summary>
    /// <param name="firstDay">First day in the time interval</param>
    /// <param name="lastDay">Last day in the time interval</param>
    /// <param name="bankHolidays">List of bank holidays excluding weekends</param>
    /// <returns>Number of business days during the 'span'</returns>
    public static int BusinessDaysUntil(this DateTime firstDay, DateTime lastDay, params DateTime[] bankHolidays)
    {
        firstDay = firstDay.Date;
        lastDay = lastDay.Date;
        if (firstDay > lastDay)
            throw new ArgumentException("Incorrect last day " + lastDay);

        TimeSpan span = lastDay - firstDay;
        int businessDays = span.Days + 1;
        int fullWeekCount = businessDays / 7;
        // find out if there are weekends during the time exceedng the full weeks
        if (businessDays > fullWeekCount*7)
        {
            // we are here to find out if there is a 1-day or 2-days weekend
            // in the time interval remaining after subtracting the complete weeks
            int firstDayOfWeek = (int) firstDay.DayOfWeek;
            int lastDayOfWeek = (int) lastDay.DayOfWeek;
            if (lastDayOfWeek < firstDayOfWeek)
                lastDayOfWeek += 7;
            if (firstDayOfWeek <= 6)
            {
                if (lastDayOfWeek >= 7)// Both Saturday and Sunday are in the remaining time interval
                    businessDays -= 2;
                else if (lastDayOfWeek >= 6)// Only Saturday is in the remaining time interval
                    businessDays -= 1;
            }
            else if (firstDayOfWeek <= 7 && lastDayOfWeek >= 7)// Only Sunday is in the remaining time interval
                businessDays -= 1;
        }

        // subtract the weekends during the full weeks in the interval
        businessDays -= fullWeekCount + fullWeekCount;

        // subtract the number of bank holidays during the time interval
        foreach (DateTime bankHoliday in bankHolidays)
        {
            DateTime bh = bankHoliday.Date;
            if (firstDay <= bh && bh <= lastDay)
                --businessDays;
        }

        return businessDays;
    }

Diedit oleh Slauma, Agustus 2011

Jawaban yang bagus! Namun ada sedikit bug. Saya mengambil kebebasan untuk mengedit jawaban ini karena penjawab tidak ada sejak 2009.

Kode di atas mengasumsikan bahwa DayOfWeek.Sundaymemiliki nilai 7yang tidak demikian. Nilainya sebenarnya 0. Ini mengarah pada perhitungan yang salah jika misalnya firstDaydan lastDaykeduanya adalah hari Minggu yang sama. Metode ini kembali 1dalam kasus ini tetapi seharusnya begitu 0.

Perbaikan termudah untuk bug ini: Ganti kode di atas baris di mana firstDayOfWeekdan lastDayOfWeekdideklarasikan sebagai berikut:

int firstDayOfWeek = firstDay.DayOfWeek == DayOfWeek.Sunday 
    ? 7 : (int)firstDay.DayOfWeek;
int lastDayOfWeek = lastDay.DayOfWeek == DayOfWeek.Sunday
    ? 7 : (int)lastDay.DayOfWeek;

Sekarang hasilnya adalah:

• Jumat sampai Jumat -> 1
• Sabtu sampai Sabtu -> 0
• Minggu sampai Minggu -> 0
• Jumat sampai Sabtu -> 1
• Jumat sampai Minggu -> 1
• Jumat sampai Senin -> 2
• Sabtu sampai Senin -> 1
• Minggu sampai Senin -> 1
• Senin sampai Senin -> 1

Baik. Saya pikir inilah saatnya untuk memposting jawaban yang benar:

public static double GetBusinessDays(DateTime startD, DateTime endD)
{
    double calcBusinessDays =
        1 + ((endD - startD).TotalDays * 5 -
        (startD.DayOfWeek - endD.DayOfWeek) * 2) / 7;

    if (endD.DayOfWeek == DayOfWeek.Saturday) calcBusinessDays--;
    if (startD.DayOfWeek == DayOfWeek.Sunday) calcBusinessDays--;

    return calcBusinessDays;
}

Sumber Asli:

http://alecpojidaev.wordpress.com/2009/10/29/work-days-calculation-with-c/

Solusi PS yang diposting di atas membuat saya sic karena beberapa alasan.

Saya tahu pertanyaan ini sudah terpecahkan, tetapi saya pikir saya bisa memberikan jawaban yang lebih lugas yang dapat membantu pengunjung lain di masa depan.

Inilah pendapat saya:

public int GetWorkingDays(DateTime from, DateTime to)
{
    var dayDifference = (int)to.Subtract(from).TotalDays;
    return Enumerable
        .Range(1, dayDifference)
        .Select(x => from.AddDays(x))
        .Count(x => x.DayOfWeek != DayOfWeek.Saturday && x.DayOfWeek != DayOfWeek.Sunday);
}

Ini adalah kiriman asli saya:

public int GetWorkingDays(DateTime from, DateTime to)
{
    var totalDays = 0;
    for (var date = from; date < to; date = date.AddDays(1))
    {
        if (date.DayOfWeek != DayOfWeek.Saturday
            && date.DayOfWeek != DayOfWeek.Sunday)
            totalDays++;
    }

    return totalDays;
}

Tentukan Metode Ekstensi pada DateTime seperti ini:

public static class DateTimeExtensions
{
    public static bool IsWorkingDay(this DateTime date)
    {
        return date.DayOfWeek != DayOfWeek.Saturday
            && date.DayOfWeek != DayOfWeek.Sunday;
    }
}

Kemudian, gunakan dalam klausa Di mana untuk memfilter daftar tanggal yang lebih luas:

var allDates = GetDates(); // method which returns a list of dates

// filter dates by working day's  
var countOfWorkDays = allDates
     .Where(day => day.IsWorkingDay())
     .Count() ;

Saya menggunakan kode berikut untuk juga memperhitungkan hari libur bank:

public class WorkingDays
{
    public List<DateTime> GetHolidays()
    {
        var client = new WebClient();
        var json = client.DownloadString("https://www.gov.uk/bank-holidays.json");
        var js = new JavaScriptSerializer();
        var holidays = js.Deserialize <Dictionary<string, Holidays>>(json);
        return holidays["england-and-wales"].events.Select(d => d.date).ToList();
    }

    public int GetWorkingDays(DateTime from, DateTime to)
    {
        var totalDays = 0;
        var holidays = GetHolidays();
        for (var date = from.AddDays(1); date <= to; date = date.AddDays(1))
        {
            if (date.DayOfWeek != DayOfWeek.Saturday
                && date.DayOfWeek != DayOfWeek.Sunday
                && !holidays.Contains(date))
                totalDays++;
        }

        return totalDays;
    }
}

public class Holidays
{
    public string division { get; set; }
    public List<Event> events { get; set; }
}

public class Event
{
    public DateTime date { get; set; }
    public string notes { get; set; }
    public string title { get; set; }
}

Dan Tes Unit:

[TestClass]
public class WorkingDays
{
    [TestMethod]
    public void SameDayIsZero()
    {
        var service = new WorkingDays();

        var from = new DateTime(2013, 8, 12);

        Assert.AreEqual(0, service.GetWorkingDays(from, from));

    }

    [TestMethod]
    public void CalculateDaysInWorkingWeek()
    {
        var service = new WorkingDays();

        var from = new DateTime(2013, 8, 12);
        var to = new DateTime(2013, 8, 16);

        Assert.AreEqual(4, service.GetWorkingDays(from, to), "Mon - Fri = 4");

        Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 13)), "Mon - Tues = 1");
    }

    [TestMethod]
    public void NotIncludeWeekends()
    {
        var service = new WorkingDays();

        var from = new DateTime(2013, 8, 9);
        var to = new DateTime(2013, 8, 16);

        Assert.AreEqual(5, service.GetWorkingDays(from, to), "Fri - Fri = 5");

        Assert.AreEqual(2, service.GetWorkingDays(from, new DateTime(2013, 8, 13)), "Fri - Tues = 2");
        Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 12)), "Fri - Mon = 1");
    }

    [TestMethod]
    public void AccountForHolidays()
    {
        var service = new WorkingDays();

        var from = new DateTime(2013, 8, 23);

        Assert.AreEqual(0, service.GetWorkingDays(from, new DateTime(2013, 8, 26)), "Fri - Mon = 0");

        Assert.AreEqual(1, service.GetWorkingDays(from, new DateTime(2013, 8, 27)), "Fri - Tues = 1");
    }
}

Nah ini telah dipukuli sampai mati. :) Namun saya tetap akan memberikan jawaban lain karena saya membutuhkan sesuatu yang sedikit berbeda. Solusi ini berbeda karena mengembalikan Business TimeSpan antara awal dan akhir, dan Anda dapat mengatur jam kerja hari itu, serta menambahkan hari libur. Jadi, Anda dapat menggunakannya untuk menghitung apakah itu terjadi dalam satu hari, di sepanjang hari, selama akhir pekan, dan bahkan hari libur. Dan Anda bisa mendapatkan hari kerja atau tidak dengan hanya mendapatkan apa yang Anda butuhkan dari objek TimeSpan yang dikembalikan. Dan cara menggunakan daftar hari, Anda dapat melihat betapa mudahnya menambahkan daftar hari non-kerja jika bukan Sab dan Ming yang biasa. Dan saya mengujinya selama setahun, dan tampaknya super cepat.

Saya hanya berharap kode yang ditempelkan akurat. Tapi saya tahu itu berhasil.

public static TimeSpan GetBusinessTimespanBetween(
    DateTime start, DateTime end,
    TimeSpan workdayStartTime, TimeSpan workdayEndTime,
    List<DateTime> holidays = null)
{
    if (end < start)
        throw new ArgumentException("start datetime must be before end datetime.");

    // Just create an empty list for easier coding.
    if (holidays == null) holidays = new List<DateTime>();

    if (holidays.Where(x => x.TimeOfDay.Ticks > 0).Any())
        throw new ArgumentException("holidays can not have a TimeOfDay, only the Date.");

    var nonWorkDays = new List<DayOfWeek>() { DayOfWeek.Saturday, DayOfWeek.Sunday };

    var startTime = start.TimeOfDay;

    // If the start time is before the starting hours, set it to the starting hour.
    if (startTime < workdayStartTime) startTime = workdayStartTime;

    var timeBeforeEndOfWorkDay = workdayEndTime - startTime;

    // If it's after the end of the day, then this time lapse doesn't count.
    if (timeBeforeEndOfWorkDay.TotalSeconds < 0) timeBeforeEndOfWorkDay = new TimeSpan();
    // If start is during a non work day, it doesn't count.
    if (nonWorkDays.Contains(start.DayOfWeek)) timeBeforeEndOfWorkDay = new TimeSpan();
    else if (holidays.Contains(start.Date)) timeBeforeEndOfWorkDay = new TimeSpan();

    var endTime = end.TimeOfDay;

    // If the end time is after the ending hours, set it to the ending hour.
    if (endTime > workdayEndTime) endTime = workdayEndTime;

    var timeAfterStartOfWorkDay = endTime - workdayStartTime;

    // If it's before the start of the day, then this time lapse doesn't count.
    if (timeAfterStartOfWorkDay.TotalSeconds < 0) timeAfterStartOfWorkDay = new TimeSpan();
    // If end is during a non work day, it doesn't count.
    if (nonWorkDays.Contains(end.DayOfWeek)) timeAfterStartOfWorkDay = new TimeSpan();
    else if (holidays.Contains(end.Date)) timeAfterStartOfWorkDay = new TimeSpan();

    // Easy scenario if the times are during the day day.
    if (start.Date.CompareTo(end.Date) == 0)
    {
        if (nonWorkDays.Contains(start.DayOfWeek)) return new TimeSpan();
        else if (holidays.Contains(start.Date)) return new TimeSpan();
        return endTime - startTime;
    }
    else
    {
        var timeBetween = end - start;
        var daysBetween = (int)Math.Floor(timeBetween.TotalDays);
        var dailyWorkSeconds = (int)Math.Floor((workdayEndTime - workdayStartTime).TotalSeconds);

        var businessDaysBetween = 0;

        // Now the fun begins with calculating the actual Business days.
        if (daysBetween > 0)
        {
            var nextStartDay = start.AddDays(1).Date;
            var dayBeforeEnd = end.AddDays(-1).Date;
            for (DateTime d = nextStartDay; d <= dayBeforeEnd; d = d.AddDays(1))
            {
                if (nonWorkDays.Contains(d.DayOfWeek)) continue;
                else if (holidays.Contains(d.Date)) continue;
                businessDaysBetween++;
            }
        }

        var dailyWorkSecondsToAdd = dailyWorkSeconds * businessDaysBetween;

        var output = timeBeforeEndOfWorkDay + timeAfterStartOfWorkDay;
        output = output + new TimeSpan(0, 0, dailyWorkSecondsToAdd);

        return output;
    }
}

Dan berikut ini kode pengujiannya: Perhatikan bahwa Anda hanya perlu meletakkan fungsi ini di kelas yang disebut DateHelper agar kode pengujian berfungsi.

[TestMethod]
public void TestGetBusinessTimespanBetween()
{
    var workdayStart = new TimeSpan(8, 0, 0);
    var workdayEnd = new TimeSpan(17, 0, 0);

    var holidays = new List<DateTime>()
    {
        new DateTime(2018, 1, 15), // a Monday
        new DateTime(2018, 2, 15) // a Thursday
    };

    var testdata = new[]
    {
        new
        {
            expectedMinutes = 0,
            start = new DateTime(2016, 10, 19, 9, 50, 0),
            end = new DateTime(2016, 10, 19, 9, 50, 0)
        },
        new
        {
            expectedMinutes = 10,
            start = new DateTime(2016, 10, 19, 9, 50, 0),
            end = new DateTime(2016, 10, 19, 10, 0, 0)
        },
        new
        {
            expectedMinutes = 5,
            start = new DateTime(2016, 10, 19, 7, 50, 0),
            end = new DateTime(2016, 10, 19, 8, 5, 0)
        },
        new
        {
            expectedMinutes = 5,
            start = new DateTime(2016, 10, 19, 16, 55, 0),
            end = new DateTime(2016, 10, 19, 17, 5, 0)
        },
        new
        {
            expectedMinutes = 15,
            start = new DateTime(2016, 10, 19, 16, 50, 0),
            end = new DateTime(2016, 10, 20, 8, 5, 0)
        },
        new
        {
            expectedMinutes = 10,
            start = new DateTime(2016, 10, 19, 16, 50, 0),
            end = new DateTime(2016, 10, 20, 7, 55, 0)
        },
        new
        {
            expectedMinutes = 5,
            start = new DateTime(2016, 10, 19, 17, 10, 0),
            end = new DateTime(2016, 10, 20, 8, 5, 0)
        },
        new
        {
            expectedMinutes = 0,
            start = new DateTime(2016, 10, 19, 17, 10, 0),
            end = new DateTime(2016, 10, 20, 7, 5, 0)
        },
        new
        {
            expectedMinutes = 545,
            start = new DateTime(2016, 10, 19, 12, 10, 0),
            end = new DateTime(2016, 10, 20, 12, 15, 0)
        },
        // Spanning multiple weekdays
        new
        {
            expectedMinutes = 835,
            start = new DateTime(2016, 10, 19, 12, 10, 0),
            end = new DateTime(2016, 10, 21, 8, 5, 0)
        },
        // Spanning multiple weekdays
        new
        {
            expectedMinutes = 1375,
            start = new DateTime(2016, 10, 18, 12, 10, 0),
            end = new DateTime(2016, 10, 21, 8, 5, 0)
        },
        // Spanning from a Thursday to a Tuesday, 5 mins short of complete day.
        new
        {
            expectedMinutes = 1615,
            start = new DateTime(2016, 10, 20, 12, 10, 0),
            end = new DateTime(2016, 10, 25, 12, 5, 0)
        },
        // Spanning from a Thursday to a Tuesday, 5 mins beyond complete day.
        new
        {
            expectedMinutes = 1625,
            start = new DateTime(2016, 10, 20, 12, 10, 0),
            end = new DateTime(2016, 10, 25, 12, 15, 0)
        },
        // Spanning from a Friday to a Monday, 5 mins beyond complete day.
        new
        {
            expectedMinutes = 545,
            start = new DateTime(2016, 10, 21, 12, 10, 0),
            end = new DateTime(2016, 10, 24, 12, 15, 0)
        },
        // Spanning from a Friday to a Monday, 5 mins short complete day.
        new
        {
            expectedMinutes = 535,
            start = new DateTime(2016, 10, 21, 12, 10, 0),
            end = new DateTime(2016, 10, 24, 12, 5, 0)
        },
        // Spanning from a Saturday to a Monday, 5 mins short complete day.
        new
        {
            expectedMinutes = 245,
            start = new DateTime(2016, 10, 22, 12, 10, 0),
            end = new DateTime(2016, 10, 24, 12, 5, 0)
        },
        // Spanning from a Saturday to a Sunday, 5 mins beyond complete day.
        new
        {
            expectedMinutes = 0,
            start = new DateTime(2016, 10, 22, 12, 10, 0),
            end = new DateTime(2016, 10, 23, 12, 15, 0)
        },
        // Times within the same Saturday.
        new
        {
            expectedMinutes = 0,
            start = new DateTime(2016, 10, 22, 12, 10, 0),
            end = new DateTime(2016, 10, 23, 12, 15, 0)
        },
        // Spanning from a Saturday to the Sunday next week.
        new
        {
            expectedMinutes = 2700,
            start = new DateTime(2016, 10, 22, 12, 10, 0),
            end = new DateTime(2016, 10, 30, 12, 15, 0)
        },
        // Spanning a year.
        new
        {
            expectedMinutes = 143355,
            start = new DateTime(2016, 10, 22, 12, 10, 0),
            end = new DateTime(2017, 10, 30, 12, 15, 0)
        },
        // Spanning a year with 2 holidays.
        new
        {
            expectedMinutes = 142815,
            start = new DateTime(2017, 10, 22, 12, 10, 0),
            end = new DateTime(2018, 10, 30, 12, 15, 0)
        },
    };

    foreach (var item in testdata)
    {
        Assert.AreEqual(item.expectedMinutes,
            DateHelper.GetBusinessTimespanBetween(
                item.start, item.end,
                workdayStart, workdayEnd,
                holidays)
                .TotalMinutes);
    }
}

Solusi ini menghindari iterasi, bekerja untuk perbedaan hari kerja + ve dan -ve dan menyertakan rangkaian pengujian unit untuk meregresi terhadap metode penghitungan hari kerja yang lebih lambat. Saya juga menyertakan metode ringkas untuk menambahkan hari kerja yang juga berfungsi dengan cara non-iteratif yang sama.

Pengujian unit mencakup beberapa ribu kombinasi tanggal untuk menguji secara menyeluruh semua kombinasi awal / akhir hari kerja dengan rentang tanggal kecil dan besar.

Penting : Kami membuat asumsi bahwa kami menghitung hari dengan mengecualikan tanggal mulai dan termasuk tanggal akhir. Ini penting saat menghitung hari kerja karena hari mulai / akhir spesifik yang Anda sertakan / kecualikan memengaruhi hasil. Ini juga memastikan bahwa perbedaan antara dua hari yang sama selalu nol dan bahwa kami hanya menyertakan hari kerja penuh karena biasanya Anda ingin jawabannya benar kapan saja pada tanggal mulai saat ini (seringkali hari ini) dan menyertakan tanggal akhir lengkap (mis. tanggal jatuh tempo).

CATATAN: Kode ini memerlukan penyesuaian tambahan untuk hari libur tetapi sesuai dengan asumsi di atas, kode ini harus mengecualikan hari libur pada tanggal mulai.

Tambahkan hari kerja:

private static readonly int[,] _addOffset = 
{
  // 0  1  2  3  4
    {0, 1, 2, 3, 4}, // Su  0
    {0, 1, 2, 3, 4}, // M   1
    {0, 1, 2, 3, 6}, // Tu  2
    {0, 1, 4, 5, 6}, // W   3
    {0, 1, 4, 5, 6}, // Th  4
    {0, 3, 4, 5, 6}, // F   5
    {0, 2, 3, 4, 5}, // Sa  6
};

public static DateTime AddWeekdays(this DateTime date, int weekdays)
{
    int extraDays = weekdays % 5;
    int addDays = weekdays >= 0
        ? (weekdays / 5) * 7 + _addOffset[(int)date.DayOfWeek, extraDays]
        : (weekdays / 5) * 7 - _addOffset[6 - (int)date.DayOfWeek, -extraDays];
    return date.AddDays(addDays);
}

Hitung perbedaan hari kerja:

static readonly int[,] _diffOffset = 
{
  // Su M  Tu W  Th F  Sa
    {0, 1, 2, 3, 4, 5, 5}, // Su
    {4, 0, 1, 2, 3, 4, 4}, // M 
    {3, 4, 0, 1, 2, 3, 3}, // Tu
    {2, 3, 4, 0, 1, 2, 2}, // W 
    {1, 2, 3, 4, 0, 1, 1}, // Th
    {0, 1, 2, 3, 4, 0, 0}, // F 
    {0, 1, 2, 3, 4, 5, 0}, // Sa
};

public static int GetWeekdaysDiff(this DateTime dtStart, DateTime dtEnd)
{
    int daysDiff = (int)(dtEnd - dtStart).TotalDays;
    return daysDiff >= 0
        ? 5 * (daysDiff / 7) + _diffOffset[(int) dtStart.DayOfWeek, (int) dtEnd.DayOfWeek]
        : 5 * (daysDiff / 7) - _diffOffset[6 - (int) dtStart.DayOfWeek, 6 - (int) dtEnd.DayOfWeek];
}

Saya menemukan bahwa sebagian besar solusi lain pada stack overflow lambat (berulang) atau terlalu kompleks dan banyak yang salah. Moral dari cerita ini adalah ... Jangan percaya kecuali Anda telah mengujinya secara mendalam !!

Pengujian unit berdasarkan pengujian Kombinatorial NUnit dan ekstensi ShouldBe NUnit.

[TestFixture]
public class DateTimeExtensionsTests
{
    /// <summary>
    /// Exclude start date, Include end date
    /// </summary>
    /// <param name="dtStart"></param>
    /// <param name="dtEnd"></param>
    /// <returns></returns>
    private IEnumerable<DateTime> GetDateRange(DateTime dtStart, DateTime dtEnd)
    {
        Console.WriteLine(@"dtStart={0:yy-MMM-dd ddd}, dtEnd={1:yy-MMM-dd ddd}", dtStart, dtEnd);

        TimeSpan diff = dtEnd - dtStart;
        Console.WriteLine(diff);

        if (dtStart <= dtEnd)
        {
            for (DateTime dt = dtStart.AddDays(1); dt <= dtEnd; dt = dt.AddDays(1))
            {
                Console.WriteLine(@"dt={0:yy-MMM-dd ddd}", dt);
                yield return dt;
            }
        }
        else
        {
            for (DateTime dt = dtStart.AddDays(-1); dt >= dtEnd; dt = dt.AddDays(-1))
            {
                Console.WriteLine(@"dt={0:yy-MMM-dd ddd}", dt);
                yield return dt;
            }
        }
    }

    [Test, Combinatorial]
    public void TestGetWeekdaysDiff(
        [Values(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 30)]
        int startDay,
        [Values(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 30)]
        int endDay,
        [Values(7)]
        int startMonth,
        [Values(7)]
        int endMonth)
    {
        // Arrange
        DateTime dtStart = new DateTime(2016, startMonth, startDay);
        DateTime dtEnd = new DateTime(2016, endMonth, endDay);

        int nDays = GetDateRange(dtStart, dtEnd)
            .Count(dt => dt.DayOfWeek != DayOfWeek.Saturday && dt.DayOfWeek != DayOfWeek.Sunday);

        if (dtEnd < dtStart) nDays = -nDays;

        Console.WriteLine(@"countBusDays={0}", nDays);

        // Act / Assert
        dtStart.GetWeekdaysDiff(dtEnd).ShouldBe(nDays);
    }

    [Test, Combinatorial]
    public void TestAddWeekdays(
        [Values(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 30)]
        int startDay,
        [Values(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 20, 30)]
        int weekdays)
    {
        DateTime dtStart = new DateTime(2016, 7, startDay);
        DateTime dtEnd1 = dtStart.AddWeekdays(weekdays);     // ADD
        dtStart.GetWeekdaysDiff(dtEnd1).ShouldBe(weekdays);  

        DateTime dtEnd2 = dtStart.AddWeekdays(-weekdays);    // SUBTRACT
        dtStart.GetWeekdaysDiff(dtEnd2).ShouldBe(-weekdays);
    }
}

Berikut beberapa kode untuk tujuan itu, dengan hari libur Swedia tetapi Anda dapat menyesuaikan hari libur apa yang dihitung. Perhatikan bahwa saya menambahkan batas yang mungkin ingin Anda hapus, tetapi itu untuk sistem berbasis web dan saya tidak ingin siapa pun memasukkan tanggal besar untuk memonopoli proses

  public static int GetWorkdays(DateTime from ,DateTime to)
    {
        int limit = 9999;
        int counter = 0;
        DateTime current = from;
        int result = 0;

        if (from > to)
        {
            DateTime temp = from;
            from = to;
            to = temp;
        }

        if (from >= to)
        {
            return 0;
        }


        while (current <= to && counter < limit)
        {
            if (IsSwedishWorkday(current))
            {
                result++;
            }
            current = current.AddDays(1);
            counter++;

        }
        return result;
    }


    public static bool IsSwedishWorkday(DateTime date)
    {
        return (!IsSwedishHoliday(date) && date.DayOfWeek != DayOfWeek.Saturday && date.DayOfWeek != DayOfWeek.Sunday);
    }

    public static bool IsSwedishHoliday(DateTime date)
    {
        return (
        IsSameDay(GetEpiphanyDay(date.Year), date) ||
        IsSameDay(GetMayDay(date.Year), date) ||
        IsSameDay(GetSwedishNationalDay(date.Year), date) ||
        IsSameDay(GetChristmasDay(date.Year), date) ||
        IsSameDay(GetBoxingDay(date.Year), date) ||
        IsSameDay(GetGoodFriday(date.Year), date) ||
        IsSameDay(GetAscensionDay(date.Year), date) ||
        IsSameDay(GetAllSaintsDay(date.Year), date) ||
        IsSameDay(GetMidsummersDay(date.Year), date) ||
        IsSameDay(GetPentecostDay(date.Year), date) ||
        IsSameDay(GetEasterMonday(date.Year), date) ||
        IsSameDay(GetNewYearsDay(date.Year), date) ||
        IsSameDay(GetEasterDay(date.Year), date)
        );
    }

    // Trettondagen
    public static DateTime GetEpiphanyDay(int year)
    {
        return new DateTime(year, 1, 6);
    }

    // Första maj
    public static DateTime GetMayDay(int year)
    {
        return new DateTime(year,5,1);
    }

    // Juldagen
    public static DateTime GetSwedishNationalDay(int year)
    {
        return new DateTime(year, 6, 6);
    }


    // Juldagen
    public static DateTime GetNewYearsDay(int year)
    {
        return new DateTime(year,1,1);
    }

    // Juldagen
    public static DateTime GetChristmasDay(int year)
    {
        return new DateTime(year,12,25);
    }

    // Annandag jul
    public static DateTime GetBoxingDay(int year)
    {
        return new DateTime(year, 12, 26);
    }


    // Långfredagen
    public static DateTime GetGoodFriday(int year)
    {
        return GetEasterDay(year).AddDays(-3);
    }

    // Kristi himmelsfärdsdag
    public static DateTime GetAscensionDay(int year)
    {
        return GetEasterDay(year).AddDays(5*7+4);
    }

    // Midsommar
    public static DateTime GetAllSaintsDay(int year)
    {
        DateTime result = new DateTime(year,10,31);
        while (result.DayOfWeek != DayOfWeek.Saturday)
        {
            result = result.AddDays(1);
        }
        return result;
    }

    // Midsommar
    public static DateTime GetMidsummersDay(int year)
    {
        DateTime result = new DateTime(year, 6, 20);
        while (result.DayOfWeek != DayOfWeek.Saturday)
        {
            result = result.AddDays(1);
        }
        return result;
    }

    // Pingstdagen
    public static DateTime GetPentecostDay(int year)
    {
        return GetEasterDay(year).AddDays(7 * 7);
    }

    // Annandag påsk
    public static DateTime GetEasterMonday(int year)
    {
        return GetEasterDay(year).AddDays(1);
    }
    public static DateTime GetEasterDay(int y)
    {
        double c;
        double n;
        double k;
        double i;
        double j;
        double l;
        double m;
        double d;
        c = System.Math.Floor(y / 100.0);
        n = y - 19 * System.Math.Floor(y / 19.0);
        k = System.Math.Floor((c - 17) / 25.0);
        i = c - System.Math.Floor(c / 4) - System.Math.Floor((c - k) / 3) + 19 * n + 15;
        i = i - 30 * System.Math.Floor(i / 30);
        i = i - System.Math.Floor(i / 28) * (1 - System.Math.Floor(i / 28) * System.Math.Floor(29 / (i + 1)) * System.Math.Floor((21 - n) / 11));
        j = y + System.Math.Floor(y / 4.0) + i + 2 - c + System.Math.Floor(c / 4);
        j = j - 7 * System.Math.Floor(j / 7);
        l = i - j;
        m = 3 + System.Math.Floor((l + 40) / 44);// month
        d = l + 28 - 31 * System.Math.Floor(m / 4);// day

        double days = ((m == 3) ? d : d + 31);

        DateTime result = new DateTime(y, 3, 1).AddDays(days-1);

        return result;
    }

Berikut kode contoh singkatnya. Ini adalah metode kelas, jadi hanya akan berfungsi di dalam kelas Anda. Jika Anda menginginkannya static, ubah tanda tangan menjadi private static(atau public static).

    private IEnumerable<DateTime> GetWorkingDays(DateTime sd, DateTime ed)
    {
        for (var d = sd; d <= ed; d = d.AddDays(1))
            if (d.DayOfWeek != DayOfWeek.Saturday && d.DayOfWeek != DayOfWeek.Sunday)
                yield return d;
    }

Metode ini membuat variabel loop d, menginisialisasinya ke hari mulai sd, lalu menambah satu hari setiap iteration ( d = d.AddDays(1)).

Ini mengembalikan nilai yang diinginkan menggunakan yield, yang membuat file iterator. Hal yang keren tentang iterator adalah bahwa mereka tidak menyimpan semua nilai IEnumerabledalam memori, hanya memanggil masing-masing secara berurutan. Artinya, Anda dapat memanggil metode ini dari awal waktu hingga sekarang tanpa harus khawatir kehabisan memori.

Saya banyak mencari algoritma yang mudah dicerna untuk menghitung hari kerja antara 2 tanggal, dan juga untuk mengecualikan hari libur nasional, dan akhirnya saya memutuskan untuk menggunakan pendekatan ini:

public static int NumberOfWorkingDaysBetween2Dates(DateTime start,DateTime due,IEnumerable<DateTime> holidays)
        {
            var dic = new Dictionary<DateTime, DayOfWeek>();
            var totalDays = (due - start).Days;
            for (int i = 0; i < totalDays + 1; i++)
            {
                if (!holidays.Any(x => x == start.AddDays(i)))
                    dic.Add(start.AddDays(i), start.AddDays(i).DayOfWeek);
            }

            return dic.Where(x => x.Value != DayOfWeek.Saturday && x.Value != DayOfWeek.Sunday).Count();
        } 

Pada dasarnya saya ingin mengikuti setiap tanggal dan mengevaluasi kondisi saya:

1. Bukankah hari Sabtu
2. Bukankah hari Minggu
3. Bukan hari libur nasional

tetapi juga saya ingin menghindari pengulangan tanggal.

Dengan menjalankan dan mengukur waktu yang dibutuhkan untuk mengevaluasi 1 tahun penuh, saya mendapatkan hasil sebagai berikut:

static void Main(string[] args)
        {
            var start = new DateTime(2017, 1, 1);
            var due = new DateTime(2017, 12, 31);

            var sw = Stopwatch.StartNew();
            var days = NumberOfWorkingDaysBetween2Dates(start, due,NationalHolidays());
            sw.Stop();

            Console.WriteLine($"Total working days = {days} --- time: {sw.Elapsed}");
            Console.ReadLine();

            // result is:
           // Total working days = 249-- - time: 00:00:00.0269087
        }

Edit: metode baru yang lebih sederhana:

public static int ToBusinessWorkingDays(this DateTime start, DateTime due, DateTime[] holidays)
        {
            return Enumerable.Range(0, (due - start).Days)
                            .Select(a => start.AddDays(a))
                            .Where(a => a.DayOfWeek != DayOfWeek.Sunday)
                            .Where(a => a.DayOfWeek != DayOfWeek.Saturday)
                            .Count(a => !holidays.Any(x => x == a));

        }

Saya pikir tidak ada jawaban di atas yang benar. Tak satu pun dari mereka menyelesaikan semua kasus khusus seperti ketika tanggal dimulai dan berakhir pada tengah akhir pekan, ketika tanggal dimulai pada hari Jumat dan berakhir pada Senin depan, dll. Selain itu, mereka semua membulatkan perhitungan menjadi keseluruhan hari, jadi jika tanggal mulai di tengah hari sabtu misalnya, itu akan mengurangi satu hari penuh dari hari kerja, memberikan hasil yang salah ...

Bagaimanapun, inilah solusi saya yang cukup efisien dan sederhana dan berfungsi untuk semua kasus. Triknya adalah menemukan hari Senin sebelumnya untuk tanggal mulai dan berakhir, dan kemudian lakukan kompensasi kecil ketika mulai dan akhir terjadi selama akhir pekan:

public double WorkDays(DateTime startDate, DateTime endDate){
        double weekendDays;

        double days = endDate.Subtract(startDate).TotalDays;

        if(days<0) return 0;

        DateTime startMonday = startDate.AddDays(DayOfWeek.Monday - startDate.DayOfWeek).Date;
        DateTime endMonday = endDate.AddDays(DayOfWeek.Monday - endDate.DayOfWeek).Date;

        weekendDays = ((endMonday.Subtract(startMonday).TotalDays) / 7) * 2;

        // compute fractionary part of weekend days
        double diffStart = startDate.Subtract(startMonday).TotalDays - 5;
        double diffEnd = endDate.Subtract(endMonday).TotalDays - 5;

        // compensate weekenddays
        if(diffStart>0) weekendDays -= diffStart;
        if(diffEnd>0) weekendDays += diffEnd;

        return days - weekendDays;
    }

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime start = new DateTime(2014, 1, 1);
            DateTime stop = new DateTime(2014, 12, 31);

            int totalWorkingDays = GetNumberOfWorkingDays(start, stop);

            Console.WriteLine("There are {0} working days.", totalWorkingDays);
        }

        private static int GetNumberOfWorkingDays(DateTime start, DateTime stop)
        {
            TimeSpan interval = stop - start;

            int totalWeek = interval.Days / 7;
            int totalWorkingDays = 5 * totalWeek;

            int remainingDays = interval.Days % 7;


            for (int i = 0; i <= remainingDays; i++)
            {
                DayOfWeek test = (DayOfWeek)(((int)start.DayOfWeek + i) % 7);
                if (test >= DayOfWeek.Monday && test <= DayOfWeek.Friday)
                    totalWorkingDays++;
            }

            return totalWorkingDays;
        }
    }
}

Bekerja dan tanpa loop

Metode ini tidak menggunakan loop apa pun dan sebenarnya cukup sederhana. Ini memperluas rentang tanggal menjadi minggu penuh karena kita tahu bahwa setiap minggu memiliki 5 hari kerja. Kemudian menggunakan tabel pencarian untuk menemukan jumlah hari kerja yang akan dikurangi dari awal dan akhir untuk mendapatkan hasil yang benar. Saya telah memperluas kalkulasi untuk membantu menunjukkan apa yang sedang terjadi, tetapi semuanya dapat diringkas menjadi satu baris jika diperlukan.

Bagaimanapun, ini berhasil untuk saya dan jadi saya pikir saya akan mempostingnya di sini seandainya itu dapat membantu orang lain. Selamat membuat kode.

Perhitungan

• t: Jumlah total hari di antara tanggal (1 jika min = maks)
• a + b: Diperlukan hari ekstra untuk mengembangkan total menjadi minggu penuh
• k: 1.4 adalah jumlah hari kerja per minggu, yaitu (t / 7) * 5
• c: Jumlah hari kerja yang akan dikurangi dari total
• m: Tabel pemeta yang digunakan untuk menemukan nilai "c" untuk setiap hari dalam seminggu

Budaya

Kode mengasumsikan hari kerja Senin sampai Jumat. Untuk budaya lain, seperti Minggu hingga Kamis, Anda harus mengimbangi tanggal sebelum penghitungan.

metode

public int Weekdays(DateTime min, DateTime max) 
{       
        if (min.Date > max.Date) throw new Exception("Invalid date span");
        var t = (max.AddDays(1).Date - min.Date).TotalDays;
        var a = (int) min.DayOfWeek;
        var b = 6 - (int) max.DayOfWeek;
        var k = 1.4;
        var m = new int[]{0, 0, 1, 2, 3, 4, 5}; 
        var c = m[a] + m[b];
        return (int)((t + a + b) / k) - c;
}

Saya hanya akan membagikan solusi saya. Ini berhasil untuk saya, mungkin saya hanya tidak memperhatikan / tahu bahwa ada bug. Saya mulai dengan minggu pertama yang belum selesai jika ada. satu minggu penuh adalah dari hari Minggu hingga Sabtu, jadi jika (int) _now.DayOfWeek bukan 0 (Minggu), minggu pertama tidak lengkap.

Saya hanya mengurangi 1 hitungan minggu pertama untuk minggu pertama Sabtu lalu menambahkannya ke hitungan baru;

Kemudian saya mendapatkan minggu terakhir yang tidak lengkap, lalu kurangi 1 untuk minggu itu lalu tambahkan ke hitungan baru.

Kemudian akhirnya, jumlah minggu lengkap dikalikan dengan 5 (hari kerja) ditambahkan ke hitungan baru.

public int RemoveNonWorkingDays(int numberOfDays){

            int workingDays = 0;

            int firstWeek = 7 - (int)_now.DayOfWeek;

            if(firstWeek < 7){

                if(firstWeek > numberOfDays)
                    return numberOfDays;

                workingDays += firstWeek-1;
                numberOfDays -= firstWeek;
            }


            int lastWeek = numberOfDays % 7;

            if(lastWeek > 0){

                numberOfDays -= lastWeek;
                workingDays += lastWeek - 1;

            }

            workingDays += (numberOfDays/7)*5;

            return workingDays;
        }

Saya mengalami kesulitan menemukan versi TSQL yang solid dari kode ini. Di bawah ini pada dasarnya adalah konversi kode C # di sini dengan penambahan tabel Liburan yang harus digunakan untuk menghitung hari libur.

CREATE TABLE dbo.Holiday
(
    HolidayDt       DATE NOT NULL,
    Name            NVARCHAR(50) NOT NULL,
    IsWeekday       BIT NOT NULL,
    CONSTRAINT PK_Holiday PRIMARY KEY (HolidayDt)
)
GO
CREATE INDEX IDX_Holiday ON Holiday (HolidayDt, IsWeekday)

GO

CREATE function dbo.GetBusinessDays
(
     @FirstDay  datetime,
     @LastDay   datetime
) 
RETURNS INT
 AS
BEGIN
    DECLARE @BusinessDays INT, @FullWeekCount INT 
    SELECT  @FirstDay = CONVERT(DATETIME,CONVERT(DATE,@FirstDay))
        ,   @LastDay = CONVERT(DATETIME,CONVERT(DATE,@LastDay))

    IF @FirstDay > @LastDay
        RETURN NULL;

    SELECT @BusinessDays = DATEDIFF(DAY, @FirstDay, @LastDay) + 1 
    SELECT @FullWeekCount = @BusinessDays / 7;

    -- find out if there are weekends during the time exceedng the full weeks
    IF @BusinessDays > (@FullWeekCount * 7)
    BEGIN
    -- we are here to find out if there is a 1-day or 2-days weekend
    -- in the time interval remaining after subtracting the complete weeks
        DECLARE @firstDayOfWeek INT, @lastDayOfWeek INT;
        SELECT @firstDayOfWeek = DATEPART(DW, @FirstDay), @lastDayOfWeek = DATEPART(DW, @LastDay);

        IF @lastDayOfWeek < @firstDayOfWeek
                SELECT @lastDayOfWeek = @lastDayOfWeek + 7;

        IF @firstDayOfWeek <= 6 
            BEGIN
                IF (@lastDayOfWeek >= 7) --Both Saturday and Sunday are in the remaining time interval
                    BEGIN 
                        SELECT @BusinessDays = @BusinessDays - 2
                    END
                ELSE IF @lastDayOfWeek>=6 --Only Saturday is in the remaining time interval
                    BEGIN
                        SELECT @BusinessDays = @BusinessDays - 1
                    END

            END
        ELSE IF @firstDayOfWeek <= 7 AND @lastDayOfWeek >=7 -- Only Sunday is in the remaining time interval
        BEGIN 
            SELECT @BusinessDays = @BusinessDays - 1
        END
    END

    -- subtract the weekends during the full weeks in the interval
    DECLARE @Holidays INT;
    SELECT  @Holidays = COUNT(*) 
    FROM    Holiday 
    WHERE   HolidayDt BETWEEN @FirstDay AND @LastDay 
    AND     IsWeekday = CAST(1 AS BIT)

    SELECT @BusinessDays = @BusinessDays - (@FullWeekCount + @FullWeekCount) -- - @Holidays

    RETURN @BusinessDays
END

    int BusinessDayDifference(DateTime Date1, DateTime Date2)
    {
        int Sign = 1;
        if (Date2 > Date1)
        {
            Sign = -1;
            DateTime TempDate = Date1;
            Date1 = Date2;
            Date2 = TempDate;
        }
        int BusDayDiff = (int)(Date1.Date - Date2.Date).TotalDays;
        if (Date1.DayOfWeek == DayOfWeek.Saturday)
            BusDayDiff -= 1;
        if (Date2.DayOfWeek == DayOfWeek.Sunday)
            BusDayDiff -= 1;
        int Week1 = GetWeekNum(Date1);
        int Week2 = GetWeekNum(Date2);
        int WeekDiff = Week1 - Week2;
        BusDayDiff -= WeekDiff * 2;
        foreach (DateTime Holiday in Holidays)
            if (Date1 >= Holiday && Date2 <= Holiday)
                BusDayDiff--;
        BusDayDiff *= Sign;
        return BusDayDiff;
    }

    private int GetWeekNum(DateTime Date)
    {
        return (int)(Date.AddDays(-(int)Date.DayOfWeek).Ticks / TimeSpan.TicksPerDay / 7);
    }

Inilah satu solusi yang sangat sederhana untuk masalah ini. Kami memiliki tanggal mulai, tanggal akhir dan "for loop" untuk menambah hari dan menghitung untuk melihat apakah itu hari kerja atau akhir pekan dengan mengonversi ke string DayOfWeek.

class Program
{
    static void Main(string[] args)
    {
        DateTime day = new DateTime();
        Console.Write("Inser your end date (example: 01/30/2015): ");
        DateTime endDate = DateTime.Parse(Console.ReadLine());
        int numberOfDays = 0;
        for (day = DateTime.Now.Date; day.Date < endDate.Date; day = day.Date.AddDays(1))
        {
            string dayToString = Convert.ToString(day.DayOfWeek);
            if (dayToString != "Saturday" && dayToString != "Sunday") numberOfDays++;
        }
        Console.WriteLine("Number of working days (not including local holidays) between two dates is "+numberOfDays);
    }
}

Berdasarkan komentar yang ditandai sebagai jawaban dan tambalan direkomendasikan, serta -> Versi ini ingin mengubah Hari ke Jam Kerja ... Mempertimbangkan jam pada hari yang sama juga.

 /// <summary>
    /// Calculates number of business days, taking into account:
    ///  - weekends (Saturdays and Sundays)
    ///  - bank holidays in the middle of the week
    /// </summary>
    /// <param name="firstDay">First day in the time interval</param>
    /// <param name="lastDay">Last day in the time interval</param>
    /// <param name="bankHolidays">List of bank holidays excluding weekends</param>
    /// <returns>Number of business hours during the 'span'</returns>
    public static int BusinessHoursUntil(DateTime firstDay, DateTime lastDay, params DateTime[] bankHolidays)
    {
        var original_firstDay = firstDay;
        var original_lastDay = lastDay;
        firstDay = firstDay.Date;
        lastDay = lastDay.Date;
        if (firstDay > lastDay)
            return -1; //// throw new ArgumentException("Incorrect last day " + lastDay);

        TimeSpan span = lastDay - firstDay;
        int businessDays = span.Days + 1;
        int fullWeekCount = businessDays / 7;
        // find out if there are weekends during the time exceedng the full weeks
        if (businessDays > fullWeekCount * 7)
        {
            // we are here to find out if there is a 1-day or 2-days weekend
            // in the time interval remaining after subtracting the complete weeks
            int firstDayOfWeek = firstDay.DayOfWeek == DayOfWeek.Sunday ? 7 : (int)firstDay.DayOfWeek;
            int lastDayOfWeek = lastDay.DayOfWeek == DayOfWeek.Sunday ? 7 : (int)lastDay.DayOfWeek;

            if (lastDayOfWeek < firstDayOfWeek)
                lastDayOfWeek += 7;
            if (firstDayOfWeek <= 6)
            {
                if (lastDayOfWeek >= 7)// Both Saturday and Sunday are in the remaining time interval
                    businessDays -= 2;
                else if (lastDayOfWeek >= 6)// Only Saturday is in the remaining time interval
                    businessDays -= 1;
            }
            else if (firstDayOfWeek <= 7 && lastDayOfWeek >= 7)// Only Sunday is in the remaining time interval
                businessDays -= 1;
        }

        // subtract the weekends during the full weeks in the interval
        businessDays -= fullWeekCount + fullWeekCount;

        if (bankHolidays != null && bankHolidays.Any())
        {
            // subtract the number of bank holidays during the time interval
            foreach (DateTime bankHoliday in bankHolidays)
            {
                DateTime bh = bankHoliday.Date;
                if (firstDay <= bh && bh <= lastDay)
                    --businessDays;
            }
        }

        int total_business_hours = 0;
        if (firstDay.Date == lastDay.Date)
        {//If on the same day, go granular with Hours from the Orginial_*Day values
            total_business_hours = (int)(original_lastDay - original_firstDay).TotalHours;
        }
        else
        {//Convert Business-Days to TotalHours
            total_business_hours = (int)(firstDay.AddDays(businessDays).AddHours(firstDay.Hour) - firstDay).TotalHours;
        }
        return total_business_hours;
    }

Saya baru saja meningkatkan jawaban @Alexander dan @Slauma untuk mendukung minggu kerja sebagai parameter, untuk kasus di mana Sabtu adalah hari kerja, atau bahkan kasus di mana hanya ada beberapa hari dalam seminggu yang dianggap sebagai hari kerja:

/// <summary>
/// Calculate the number of business days between two dates, considering:
///  - Days of the week that are not considered business days.
///  - Holidays between these two dates.
/// </summary>
/// <param name="fDay">First day of the desired 'span'.</param>
/// <param name="lDay">Last day of the desired 'span'.</param>
/// <param name="BusinessDaysOfWeek">Days of the week that are considered to be business days, if NULL considers monday, tuesday, wednesday, thursday and friday as business days of the week.</param>
/// <param name="Holidays">Holidays, if NULL, considers no holiday.</param>
/// <returns>Number of business days during the 'span'</returns>
public static int BusinessDaysUntil(this DateTime fDay, DateTime lDay, DayOfWeek[] BusinessDaysOfWeek = null, DateTime[] Holidays = null)
{
    if (BusinessDaysOfWeek == null)
        BusinessDaysOfWeek = new DayOfWeek[] { DayOfWeek.Monday, DayOfWeek.Tuesday, DayOfWeek.Wednesday, DayOfWeek.Thursday, DayOfWeek.Friday };
    if (Holidays == null)
        Holidays = new DateTime[] { };

    fDay = fDay.Date;
    lDay = lDay.Date;

    if (fDay > lDay)
        throw new ArgumentException("Incorrect last day " + lDay);

    int bDays = (lDay - fDay).Days + 1;
    int fullWeekCount = bDays / 7;
    int fullWeekCountMult = 7 - WeekDays.Length;
    //  Find out if there are weekends during the time exceedng the full weeks
    if (bDays > (fullWeekCount * 7))
    {
        int fDayOfWeek = (int)fDay.DayOfWeek;
        int lDayOfWeek = (int)lDay.DayOfWeek;

        if (fDayOfWeek > lDayOfWeek)
            lDayOfWeek += 7;

        // If they are the same, we already covered it right before the Holiday subtraction
        if (lDayOfWeek != fDayOfWeek)
        {
            //  Here we need to see if any of the days between are considered business days
            for (int i = fDayOfWeek; i <= lDayOfWeek; i++)
                if (!WeekDays.Contains((DayOfWeek)(i > 6 ? i - 7 : i)))
                    bDays -= 1;
        }
    }

    //  Subtract the days that are not in WeekDays[] during the full weeks in the interval
    bDays -= (fullWeekCount * fullWeekCountMult);
    //  Subtract the number of bank holidays during the time interval
    bDays = bDays - Holidays.Select(x => x.Date).Count(x => fDay <= x && x <= lDay);

    return bDays;
}

Berikut adalah fungsi yang dapat kita gunakan untuk menghitung hari kerja antara dua tanggal. Saya tidak menggunakan daftar hari libur karena dapat berbeda-beda di setiap negara / wilayah.

Jika kita ingin tetap menggunakannya, kita dapat mengambil argumen ketiga sebagai daftar hari libur dan sebelum menambah hitungan kita harus memeriksa bahwa daftar tidak mengandung d

public static int GetBussinessDaysBetweenTwoDates(DateTime StartDate,   DateTime EndDate)
    {
        if (StartDate > EndDate)
            return -1;

        int bd = 0;

        for (DateTime d = StartDate; d < EndDate; d = d.AddDays(1))
        {
            if (d.DayOfWeek != DayOfWeek.Saturday && d.DayOfWeek != DayOfWeek.Sunday)
                bd++;
        }

        return bd;
    }

Saya yakin ini bisa menjadi cara yang lebih sederhana:

    public int BusinessDaysUntil(DateTime start, DateTime end, params DateTime[] bankHolidays)
    {
        int tld = (int)((end - start).TotalDays) + 1; //including end day
        int not_buss_day = 2 * (tld / 7); //Saturday and Sunday
        int rest = tld % 7; //rest.

        if (rest > 0)
        {
            int tmp = (int)start.DayOfWeek - 1 + rest;
            if (tmp == 6 || start.DayOfWeek == DayOfWeek.Sunday) not_buss_day++; else if (tmp > 6) not_buss_day += 2;
        }

        foreach (DateTime bankHoliday in bankHolidays)
        {
            DateTime bh = bankHoliday.Date;
            if (!(bh.DayOfWeek == DayOfWeek.Saturday || bh.DayOfWeek == DayOfWeek.Sunday) && (start <= bh && bh <= end))
            {
                not_buss_day++;
            }
        }
        return tld - not_buss_day;
    }

Ini adalah ide lain - metode ini memungkinkan untuk menentukan minggu kerja dan hari libur.

Idenya di sini adalah kita menemukan inti rentang tanggal dari hari kerja pertama dalam seminggu hingga hari akhir pekan terakhir dalam seminggu. Hal ini memungkinkan kami menghitung seluruh minggu dengan mudah ( tanpa mengulang semua tanggal). Yang perlu kita lakukan selanjutnya adalah menambahkan hari kerja yang jatuh sebelum awal dan akhir rentang inti ini.

public static int CalculateWorkingDays(
    DateTime startDate, 
    DateTime endDate, 
    IList<DateTime> holidays, 
    DayOfWeek firstDayOfWeek,
    DayOfWeek lastDayOfWeek)
{
    // Make sure the defined working days run contiguously
    if (lastDayOfWeek < firstDayOfWeek)
    {
        throw new Exception("Last day of week cannot fall before first day of week!");
    }

    // Create a list of the days of the week that make-up the weekend by working back
    // from the firstDayOfWeek and forward from lastDayOfWeek to get the start and end
    // the weekend
    var weekendStart = lastDayOfWeek == DayOfWeek.Saturday ? DayOfWeek.Sunday : lastDayOfWeek + 1;
    var weekendEnd = firstDayOfWeek == DayOfWeek.Sunday ? DayOfWeek.Saturday : firstDayOfWeek - 1;
    var weekendDays = new List<DayOfWeek>();

    var w = weekendStart;
    do {
        weekendDays.Add(w);
        if (w == weekendEnd) break;
        w = (w == DayOfWeek.Saturday) ? DayOfWeek.Sunday : w + 1;
    } while (true);


    // Force simple dates - no time
    startDate = startDate.Date;
    endDate = endDate.Date;

    // Ensure a progessive date range
    if (endDate < startDate)
    {
        var t = startDate;
        startDate = endDate;
        endDate = t;
    }

    // setup some working variables and constants
    const int daysInWeek = 7;           // yeah - really!
    var actualStartDate = startDate;    // this will end up on startOfWeek boundary
    var actualEndDate = endDate;        // this will end up on weekendEnd boundary
    int workingDaysInWeek = daysInWeek - weekendDays.Count;

    int workingDays = 0;        // the result we are trying to find
    int leadingDays = 0;        // the number of working days leading up to the firstDayOfWeek boundary
    int trailingDays = 0;       // the number of working days counting back to the weekendEnd boundary

    // Calculate leading working days
    // if we aren't on the firstDayOfWeek we need to step forward to the nearest
    if (startDate.DayOfWeek != firstDayOfWeek)
    {
        var d = startDate;
        do {
            if (d.DayOfWeek == firstDayOfWeek || d >= endDate)
            {
                actualStartDate = d;
                break;  
            }
            if (!weekendDays.Contains(d.DayOfWeek))
            {
                leadingDays++;
            }
            d = d.AddDays(1);
        } while(true);
    }

    // Calculate trailing working days
    // if we aren't on the weekendEnd we step back to the nearest
    if (endDate >= actualStartDate && endDate.DayOfWeek != weekendEnd)
    {
        var d = endDate;
        do {
            if (d.DayOfWeek == weekendEnd || d < actualStartDate)
            {
                actualEndDate = d;
                break;  
            }
            if (!weekendDays.Contains(d.DayOfWeek))
            {
                trailingDays++;
            }
            d = d.AddDays(-1);
        } while(true);
    }

    // Calculate the inclusive number of days between the actualStartDate and the actualEndDate
    var coreDays = (actualEndDate - actualStartDate).Days + 1;
    var noWeeks =  coreDays / daysInWeek;

    // add together leading, core and trailing days
    workingDays +=  noWeeks * workingDaysInWeek;
    workingDays += leadingDays;
    workingDays += trailingDays;

    // Finally remove any holidays that fall within the range.
    if (holidays != null)
    {
        workingDays -= holidays.Count(h => h >= startDate && (h <= endDate));
    }

    return workingDays;
}

Karena saya tidak bisa berkomentar. Ada satu masalah lagi dengan solusi yang diterima di mana hari libur bank dikurangi bahkan ketika mereka berada di akhir pekan. Melihat bagaimana masukan lain dicentang, ini juga cocok.

Oleh karena itu, foreach harus:

    // subtract the number of bank holidays during the time interval
    foreach (DateTime bankHoliday in bankHolidays)
    {
        DateTime bh = bankHoliday.Date;

        // Do not subtract bank holidays when they fall in the weekend to avoid double subtraction
        if (bh.DayOfWeek == DayOfWeek.Saturday || bh.DayOfWeek == DayOfWeek.Sunday)
                continue;

        if (firstDay <= bh && bh <= lastDay)
            --businessDays;
    }

Berikut adalah pendekatan jika Anda menggunakan MVC. Saya juga telah menghitung hari libur nasional atau hari raya apa pun yang akan dikecualikan dengan mengambilnya dari kalender hari libur yang akan Anda perlukan untuk membuatnya.

        foreach (DateTime day in EachDay(model))
        {
            bool key = false;
            foreach (LeaveModel ln in holidaycalendar)
            {
                if (day.Date == ln.Date && day.DayOfWeek != DayOfWeek.Saturday && day.DayOfWeek != DayOfWeek.Sunday)
                {
                    key = true; break;
                }
            }
            if (day.DayOfWeek == DayOfWeek.Saturday || day.DayOfWeek == DayOfWeek.Sunday)
            {
                key = true;
            }
            if (key != true)
            {
                leavecount++;
            }
        }

Leavemodel adalah daftar di sini

Berikut adalah fungsi pembantu yang saya tulis untuk tugas itu.
itu juga mengembalikan hitungan akhir pekan melalui outparameter.
jika Anda ingin, Anda dapat menyesuaikan hari "akhir pekan" dalam waktu proses untuk negara-negara yang menggunakan hari akhir pekan yang berbeda atau untuk menyertakan hari libur melalui weekendDays[]parameter opsional:

public static int GetNetworkDays(DateTime startDate, DateTime endDate,out int totalWeekenDays, DayOfWeek[] weekendDays = null)
{
    if (startDate >= endDate)
    {
        throw new Exception("start date can not be greater then or equel to end date");
    }

    DayOfWeek[] weekends = new DayOfWeek[] { DayOfWeek.Sunday, DayOfWeek.Saturday };
    if (weekendDays != null)
    {
        weekends = weekendDays;
    }

    var totaldays = (endDate - startDate).TotalDays + 1; // add one to include the first day to
    var counter = 0;
    var workdaysCounter = 0;
    var weekendsCounter = 0;

    for (int i = 0; i < totaldays; i++)
    {

        if (weekends.Contains(startDate.AddDays(counter).DayOfWeek))
        {
            weekendsCounter++;
        }
        else
        {
            workdaysCounter++;
        }

        counter++;
    }

    totalWeekenDays = weekendsCounter;
    return workdaysCounter;
}

Saya datang dengan solusi berikut

var dateStart = new DateTime(2019,01,10);
var dateEnd = new DateTime(2019,01,31);

var timeBetween = (dateEnd - dateStart).TotalDays + 1;
int numberOf7DayWeeks = (int)(timeBetween / 7);
int numberOfWeekendDays = numberOf7DayWeeks * 2;
int workingDays =(int)( timeBetween - numberOfWeekendDays);

if(dateStart.DayOfWeek == DayOfWeek.Saturday || dateEnd.DayOfWeek == DayOfWeek.Sunday){
    workingDays -=2;
}       
if(dateStart.DayOfWeek == DayOfWeek.Sunday || dateEnd.DayOfWeek == DayOfWeek.Saturday){
    workingDays -=1;
}

Anda hanya perlu mengulang setiap hari dalam rentang waktu dan mengurangi hari dari konter jika itu hari Sabtu atau Minggu.

    private float SubtractWeekend(DateTime start, DateTime end) {
        float totaldays = (end.Date - start.Date).Days;
        var iterationVal = totalDays;
        for (int i = 0; i <= iterationVal; i++) {
            int dayVal = (int)start.Date.AddDays(i).DayOfWeek;
            if(dayVal == 6 || dayVal == 0) {
                // saturday or sunday
                totalDays--;
            }
        }
        return totalDays;
    }

public static int CalculateBusinessDaysInRange(this DateTime startDate, DateTime endDate, params DateTime[] holidayDates)
{
    endDate = endDate.Date;
    if(startDate > endDate)
        throw new ArgumentException("The end date can not be before the start date!", nameof(endDate));
    int accumulator = 0;
    DateTime itterator = startDate.Date;
    do 
    {
        if(itterator.DayOfWeek != DayOfWeek.Saturday && itterator.DayOfWeek != DayOfWeek.Sunday && !holidayDates.Any(hol => hol.Date == itterator))
        { accumulator++; }
    } 
    while((itterator = itterator.AddDays(1)).Date <= endDate);
    return accumulator
}

Saya hanya memposting ini karena terlepas dari semua jawaban luar biasa yang telah diberikan, tidak ada matematika yang masuk akal bagi saya. Ini jelas merupakan metode KISS yang seharusnya berhasil dan dapat dipelihara dengan baik. Memang, jika Anda menghitung rentang yang lebih besar dari 2-3 bulan, ini bukan cara yang paling efektif. Kami hanya menentukan apakah itu hari Sabtu atau Minggu atau tanggal tersebut adalah tanggal hari libur tertentu. Kalau belum kita tambahkan hari kerja. Jika sudah maka semuanya baik-baik saja.

Saya yakin ini bisa lebih disederhanakan dengan LINQ, tapi cara ini jauh lebih mudah untuk dipahami.

Namun pendekatan lain untuk menghitung hari kerja, tidak mempertimbangkan hari libur, tetapi dengan memperhitungkan waktu pengembalian jumlah hari:

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

    while (IsWeekend(endD))
        endD = endD.Date.AddDays(-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;
}

Anda dapat bermain-main dengannya di sini: https://rextester.com/ASHRS53997

Ini adalah solusi umum.

startdayvalue adalah nomor hari dari tanggal mulai.

weekendday_1 adalah hari jumlah akhir minggu.

nomor hari - MON - 1, SEL - 2, ... SAB - 6, SUN -7.

perbedaan adalah perbedaan antara dua tanggal ..

Contoh: Tanggal Mulai: 4 April 2013, Tanggal Berakhir: 14 April 2013

Selisih: 10, startdayvalue: 4, weekendday_1: 7 (jika MINGGU adalah akhir pekan untuk Anda.)

Ini akan memberi Anda jumlah hari libur.

Jumlah hari kerja = (Selisih + 1) - hari libur1

    if (startdayvalue > weekendday_1)
    {

        if (difference > ((7 - startdayvalue) + weekendday_1))
        {
            holiday1 = (difference - ((7 - startdayvalue) + weekendday_1)) / 7;
            holiday1 = holiday1 + 1;
        }
        else
        {
            holiday1 = 0;
        }
    }
    else if (startdayvalue < weekendday_1)
    {

        if (difference > (weekendday_1 - startdayvalue))
        {
            holiday1 = (difference - (weekendday_1 - startdayvalue)) / 7;
            holiday1 = holiday1 + 1;
        }
        else if (difference == (weekendday_1 - startdayvalue))
        {
            holiday1 = 1;
        }
        else
        {
            holiday1 = 0;
        }
    }
    else
    {
        holiday1 = difference / 7;
        holiday1 = holiday1 + 1;
    }