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Properly adjust invalid dates in RecurrenceRule enumeration #1077

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Jan 6, 2025
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Properly adjust invalid dates in RecurrenceRule enumeration #1077

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3 changes: 2 additions & 1 deletion Sources/FoundationEssentials/Calendar/Calendar_Recurrence.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -909,7 +909,8 @@ extension Calendar {
}

let results = try unadjustedMatchDates.map { date, components in
(try _adjustedDate(date, startingAfter: start, allowStartDate: true, matching: components, adjustedMatchingComponents: components , matchingPolicy: matchingPolicy, repeatedTimePolicy: repeatedTimePolicy, direction: .forward, inSearchingDate: start, previouslyReturnedMatchDate: nil), components)
let adjustedComponents = _adjustedComponents(components, date: start, direction: .forward)
return (try _adjustedDate(date, startingAfter: start, allowStartDate: true, matching: components, adjustedMatchingComponents: adjustedComponents, matchingPolicy: matchingPolicy, repeatedTimePolicy: repeatedTimePolicy, direction: .forward, inSearchingDate: start, previouslyReturnedMatchDate: nil), components)
}

var foundDates: [Date] = []
Expand Down
25 changes: 24 additions & 1 deletion Tests/FoundationEssentialsTests/GregorianCalendarRecurrenceRuleTests.swift
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Expand Up @@ -426,6 +426,29 @@ final class GregorianCalendarRecurrenceRuleTests: XCTestCase {
]
XCTAssertEqual(results, expectedResults)
}

func testYearlyRecurrenceMovingToFeb29() {
/// Rule for an event that repeats on February 29th of each year, or closest date after
var rule = Calendar.RecurrenceRule(calendar: gregorian, frequency: .yearly, matchingPolicy: .nextTimePreservingSmallerComponents)
rule.months = [2]
rule.daysOfTheMonth = [29]

let rangeStart = Date(timeIntervalSince1970: 946684800.0) // 2000-01-01T00:00:00-0000
let rangeEnd = Date(timeIntervalSince1970: 1262304000.0) // 2010-01-01T00:00:00-0000
var birthdays = rule.recurrences(of: rangeStart, in: rangeStart..<rangeEnd).makeIterator()
// ^ Since the rule will change the month and day, we only borrow the time of day from the initial date

XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 951782400.0)) // 2000-02-29T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 983404800.0)) // 2001-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1014940800.0)) // 2002-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1046476800.0)) // 2003-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1078012800.0)) // 2004-02-29T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1109635200.0)) // 2005-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1141171200.0)) // 2006-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1172707200.0)) // 2007-03-01T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1204243200.0)) // 2008-02-29T00:00:00-0000
XCTAssertEqual(birthdays.next(), Date(timeIntervalSince1970: 1235865600.0)) // 2009-03-01T00:00:00-0000
}

func testYearlyRecurrenceWithMonthExpansion() {
let start = Date(timeIntervalSince1970: 1285027200.0) // 2010-09-21T00:00:00-0000
Expand Down Expand Up @@ -780,5 +803,5 @@ final class GregorianCalendarRecurrenceRuleTests: XCTestCase {
Date(timeIntervalSince1970: 1695304800.0), // 2023-09-21T14:00:00-0000
]
XCTAssertEqual(results, expectedResults)
}
}
}