80 lines
2.9 KiB
C#
80 lines
2.9 KiB
C#
namespace TaxBaik.Web.Components.Admin.Shared;
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public static class BusinessDayCalculator
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{
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private sealed record HolidayWindow(DateOnly Start, DateOnly End)
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{
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public IEnumerable<DateOnly> Dates()
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{
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for (var date = Start; date <= End; date = date.AddDays(1))
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{
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yield return date;
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}
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}
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}
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private static readonly HolidayWindow[] HolidayWindows =
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{
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new(new DateOnly(2026, 1, 1), new DateOnly(2026, 1, 1)),
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new(new DateOnly(2026, 2, 16), new DateOnly(2026, 2, 18)),
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new(new DateOnly(2026, 3, 1), new DateOnly(2026, 3, 2)),
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new(new DateOnly(2026, 5, 5), new DateOnly(2026, 5, 5)),
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new(new DateOnly(2026, 6, 6), new DateOnly(2026, 6, 6)),
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new(new DateOnly(2026, 8, 15), new DateOnly(2026, 8, 17)),
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new(new DateOnly(2026, 9, 24), new DateOnly(2026, 9, 26)),
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new(new DateOnly(2026, 10, 3), new DateOnly(2026, 10, 5)),
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new(new DateOnly(2026, 10, 9), new DateOnly(2026, 10, 9)),
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new(new DateOnly(2026, 12, 25), new DateOnly(2026, 12, 25)),
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new(new DateOnly(2027, 1, 1), new DateOnly(2027, 1, 1)),
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new(new DateOnly(2027, 2, 6), new DateOnly(2027, 2, 9)),
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new(new DateOnly(2027, 3, 1), new DateOnly(2027, 3, 2)),
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new(new DateOnly(2027, 5, 5), new DateOnly(2027, 5, 5)),
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new(new DateOnly(2027, 5, 13), new DateOnly(2027, 5, 13)),
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new(new DateOnly(2027, 6, 6), new DateOnly(2027, 6, 6)),
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new(new DateOnly(2027, 8, 15), new DateOnly(2027, 8, 16)),
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new(new DateOnly(2027, 9, 14), new DateOnly(2027, 9, 16)),
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new(new DateOnly(2027, 10, 3), new DateOnly(2027, 10, 4)),
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new(new DateOnly(2027, 10, 9), new DateOnly(2027, 10, 11)),
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new(new DateOnly(2027, 12, 25), new DateOnly(2027, 12, 26))
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};
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private static readonly HashSet<DateOnly> HolidayDates = BuildHolidayDates();
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public static DateOnly GetEffectiveDueDate(DateOnly dueDate)
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{
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var effectiveDate = dueDate;
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while (!IsBusinessDay(effectiveDate))
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{
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effectiveDate = effectiveDate.AddDays(1);
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}
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return effectiveDate;
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}
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public static int GetDday(DateOnly dueDate, DateOnly? referenceDate = null)
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{
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var today = referenceDate ?? DateOnly.FromDateTime(DateTime.Today);
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var effectiveDueDate = GetEffectiveDueDate(dueDate);
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return effectiveDueDate.DayNumber - today.DayNumber;
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}
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public static bool IsBusinessDay(DateOnly date)
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=> date.DayOfWeek is not DayOfWeek.Saturday and not DayOfWeek.Sunday
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&& !HolidayDates.Contains(date);
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private static HashSet<DateOnly> BuildHolidayDates()
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{
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var holidays = new HashSet<DateOnly>();
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foreach (var window in HolidayWindows)
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{
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foreach (var date in window.Dates())
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{
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holidays.Add(date);
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}
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}
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return holidays;
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}
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}
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