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tinohager merged 1 commit into from
Oct 28, 2026
Merged

Cocos (Keeling) Islands - Adjust holidays #1183

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143 changes: 143 additions & 0 deletions src/Nager.Date.UnitTest/Countries/CocosIslandsTest.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,143 @@
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Nager.Date.UnitTest.Countries
{
[TestClass]
public class CocosIslandsTest() : BaseTest(CountryCode.CC)
{
[TestMethod]
[DataRow(2021, 2021, 1, 1)]
[DataRow(2023, 2023, 1, 2)]
[DataRow(2024, 2024, 1, 1)]
[DataRow(2025, 2025, 1, 1)]
[DataRow(2026, 2026, 1, 1)]
[DataRow(2027, 2027, 1, 1)]
public void TestNewYearsDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "NEWYEARSDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 1, 26)]
[DataRow(2023, 2023, 1, 26)]
[DataRow(2024, 2024, 1, 26)]
[DataRow(2025, 2025, 1, 27)]
[DataRow(2026, 2026, 1, 26)]
[DataRow(2027, 2027, 1, 26)]
public void TestAustraliaDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "AUSTRALIADAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 4, 2)]
[DataRow(2023, 2023, 4, 7)]
[DataRow(2024, 2024, 3, 29)]
[DataRow(2025, 2025, 4, 18)]
[DataRow(2026, 2026, 4, 3)]
[DataRow(2027, 2027, 3, 26)]
public void TestGoodFriday(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "GOODFRIDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 4, 5)]
[DataRow(2023, 2023, 4, 10)]
[DataRow(2024, 2024, 4, 1)]
[DataRow(2025, 2025, 4, 21)]
[DataRow(2026, 2026, 4, 6)]
[DataRow(2027, 2027, 3, 29)]
public void TestEasterMonday(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "EASTERMONDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 4, 6)]
[DataRow(2023, 2023, 4, 6)]
[DataRow(2024, 2024, 4, 8)]
[DataRow(2025, 2025, 4, 7)]
[DataRow(2026, 2026, 4, 7)]
[DataRow(2027, 2027, 4, 6)]
public void TestActOfSelfDeterminationDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "SELFDETERMINATIONDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 4, 26)]
[DataRow(2023, 2023, 4, 25)]
[DataRow(2024, 2024, 4, 25)]
[DataRow(2025, 2025, 4, 25)]
[DataRow(2026, 2026, 4, 27)]
[DataRow(2027, 2027, 4, 26)]
public void TestAnzacDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "ANZACDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 6, 7)]
[DataRow(2023, 2023, 6, 6)]
[DataRow(2024, 2024, 6, 6)]
[DataRow(2025, 2025, 6, 9)]
[DataRow(2026, 2026, 6, 8)]
[DataRow(2027, 2027, 6, 7)]
public void TestMonarchBirthday(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "MONARCHBIRTHDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 12, 27)]
[DataRow(2023, 2023, 12, 25)]
[DataRow(2024, 2024, 12, 25)]
[DataRow(2025, 2025, 12, 25)]
[DataRow(2026, 2026, 12, 25)]
[DataRow(2027, 2027, 12, 27)]
public void TestChristmasDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "CHRISTMASDAY-01", observedYear, month, day);
}

[TestMethod]
[DataRow(2021, 2021, 12, 28)]
[DataRow(2023, 2023, 12, 26)]
[DataRow(2024, 2024, 12, 26)]
[DataRow(2025, 2025, 12, 26)]
[DataRow(2026, 2026, 12, 28)]
[DataRow(2027, 2027, 12, 28)]
public void TestStStephensDay(int year, int observedYear, int month, int day)
{
this.AssertObservedDate(year, "STSTEPHENSDAY-01", observedYear, month, day);
}

//[TestMethod]
//[DataRow(2021, 2021, 5, 13)]
//[DataRow(2026, 2026, 3, 20)]
//[DataRow(2027, 2027, 3, 9)]
//public void TestHariRayaPuasa(int year, int observedYear, int month, int day)
//{
// this.AssertObservedDate(year, "HARIRAYAPUASA-01", observedYear, month, day);
//}

//[TestMethod]
//[DataRow(2021, 2021, 7, 20)]
//[DataRow(2026, 2026, 5, 27)]
//[DataRow(2027, 2027, 5, 17)]
//public void TestHariRayaHaji(int year, int observedYear, int month, int day)
//{
// this.AssertObservedDate(year, "HARIRAYAHAJI-01", observedYear, month, day);
//}

//[TestMethod]
//[DataRow(2021, 2021, 10, 19)]
//[DataRow(2026, 2026, 8, 26)]
//[DataRow(2027, 2027, 8, 16)]
//public void TestHariMaulaudNabi(int year, int observedYear, int month, int day)
//{
// this.AssertObservedDate(year, "HARIMAULAUDNABI-01", observedYear, month, day);
//}
}
}
77 changes: 69 additions & 8 deletions src/Nager.Date/HolidayProviders/CocosIslandsHolidayProvider.cs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
using Nager.Date.Extensions;
using Nager.Date.Models;
using Nager.Date.ReligiousProviders;
using System;
Expand Down Expand Up @@ -25,6 +26,30 @@ public CocosIslandsHolidayProvider(
/// <inheritdoc/>
protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(int year)
{
var weekendObservedRuleSet = new ObservedRuleSet
{
Saturday = date => date.AddDays(2),
Sunday = date => date.AddDays(1),
};

var weekendObservedRuleSet2 = new ObservedRuleSet
{
Saturday = date => date.AddDays(2),
Sunday = date => date.AddDays(2),
Monday = date => date.AddDays(1),
};

var easterMonday = this._catholicProvider.EasterSunday(year).AddDays(1);

DateTime ShiftIfEasterMonday(DateTime date) => date == easterMonday ? date.AddDays(1) : date;

var selfDeterminationObservedRuleSet = new ObservedRuleSet
{
Saturday = date => ShiftIfEasterMonday(date.AddDays(2)),
Sunday = date => ShiftIfEasterMonday(date.AddDays(1)),
Monday = date => ShiftIfEasterMonday(date),
};

var holidaySpecifications = new List<HolidaySpecification>
{
new HolidaySpecification
Expand All @@ -34,6 +59,7 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "New Year's Day",
LocalName = "New Year's Day",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = weekendObservedRuleSet,
},
new HolidaySpecification
{
Expand All @@ -42,6 +68,7 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "Australia Day",
LocalName = "Australia Day",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = weekendObservedRuleSet,
},
new HolidaySpecification
{
Expand All @@ -50,6 +77,7 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "Self Determination Day",
LocalName = "Self Determination Day",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = selfDeterminationObservedRuleSet,
},
new HolidaySpecification
{
Expand All @@ -58,14 +86,7 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "Anzac Day",
LocalName = "Anzac Day",
HolidayTypes = HolidayTypes.Public,
},
new HolidaySpecification
{
Id = "KINGSBIRTHDAY-01",
Date = new DateTime(year, 6, 6),
EnglishName = "King's Birthday",
LocalName = "King's Birthday",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = weekendObservedRuleSet,
},
new HolidaySpecification
{
Expand All @@ -74,6 +95,7 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "Christmas Day",
LocalName = "Christmas Day",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = weekendObservedRuleSet,
},
new HolidaySpecification
{
Expand All @@ -82,11 +104,14 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
EnglishName = "St. Stephen's Day",
LocalName = "Boxing Day",
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = weekendObservedRuleSet2,
},
this._catholicProvider.GoodFriday("Good Friday", year),
this._catholicProvider.EasterMonday("Easter Monday", year),
};

holidaySpecifications.AddIfNotNull(this.MonarchBirthday(year, weekendObservedRuleSet));

// TODO: Islamic Holidays
// CalendarType: Lunar
// DeterminationType: MoonSighting (By the Islamic Council of Cocos Keeling Islands)
Expand All @@ -99,12 +124,48 @@ protected override IEnumerable<HolidaySpecification> GetHolidaySpecifications(in
return holidaySpecifications;
}

private HolidaySpecification MonarchBirthday(int year, ObservedRuleSet observedRuleSet)
{
var name = "Queen's Birthday";
if (year >= 2023)
{
name = "King's Birthday";
}

// Fixed on 6 June, moved to Monday when it falls on a weekend
var holidayDate = new DateTime(year, 6, 6);

if (year == 2025)
{
// Special case: Hari Raya Haji was observed on Friday, 6 June 2025 (in lieu of Saturday, 7 June 2025),
// therefore King's Birthday was moved to Monday, 9 June 2025
// (source: Proclamation No 03/2024, IOT Administrator bulletin A21/2024)
holidayDate = new DateTime(2025, 6, 9);
}

return new HolidaySpecification
{
Id = "MONARCHBIRTHDAY-01",
Date = holidayDate,
EnglishName = name,
LocalName = name,
HolidayTypes = HolidayTypes.Public,
ObservedRuleSet = observedRuleSet,
};
}

/// <inheritdoc/>
public override IEnumerable<string> GetSources()
{
return
[
"https://en.wikipedia.org/wiki/Public_holidays_in_the_Cocos_(Keeling)_Islands",
"https://www.infrastructure.gov.au/territories-regions-cities/territories/indian_ocean/iot_bulletins/2020/A041-2020-cki-public-holidays",
"https://www.infrastructure.gov.au/sites/default/files/documents/a19-2022-community-bulletin-2023-kings-birthday-cocos-keeling-islands.pdf",
"https://www.infrastructure.gov.au/sites/default/files/documents/a12-2023-2024-public-holidays-cocos-k-islands.pdf",
"https://www.infrastructure.gov.au/sites/default/files/documents/a21-2024-administrator-community-bulletin-cki-public-holidays-2025.pdf",
"https://www.infrastructure.gov.au/sites/default/files/documents/community-bulletin-cki-public-holidays-2026.pdf",
"https://www.infrastructure.gov.au/sites/default/files/documents/2027-public-holidays-cocos-keeling-islands-a15-2026-24-july-2026-pdf.pdf",
];
}
}
Expand Down
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