46 lines
1.3 KiB
C#
46 lines
1.3 KiB
C#
namespace WorkTracker.Services.Festivities;
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public sealed class ItalianFestivitySource : IItalianFestivitySource
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{
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public IReadOnlyCollection<DateOnly> GetFestivities(int year)
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{
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var easterSunday = GetEasterSunday(year);
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var easterMonday = easterSunday.AddDays(1);
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return new HashSet<DateOnly>
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{
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new(year, 1, 1),
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new(year, 1, 6),
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easterSunday,
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easterMonday,
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new(year, 4, 25),
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new(year, 5, 1),
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new(year, 6, 2),
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new(year, 8, 15),
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new(year, 11, 1),
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new(year, 12, 8),
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new(year, 12, 25),
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new(year, 12, 26)
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};
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}
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private static DateOnly GetEasterSunday(int year)
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{
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var a = year % 19;
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var b = year / 100;
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var c = year % 100;
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var d = b / 4;
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var e = b % 4;
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var f = (b + 8) / 25;
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var g = (b - f + 1) / 3;
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var h = (19 * a + b - d - g + 15) % 30;
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var i = c / 4;
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var k = c % 4;
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var l = (32 + 2 * e + 2 * i - h - k) % 7;
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var m = (a + 11 * h + 22 * l) / 451;
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var month = (h + l - 7 * m + 114) / 31;
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var day = ((h + l - 7 * m + 114) % 31) + 1;
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return new DateOnly(year, month, day);
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}
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}
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