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Use st_birthtimespec instead of st_ctim.tv_sec on Darwin #1648

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Use st_birthtimespec instead of st_ctim.tv_sec on Darwin #1648

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2 changes: 1 addition & 1 deletion Sources/FoundationEssentials/FileManager/FileManager+Files.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,7 @@ extension stat {

var creationDate: Date {
#if canImport(Darwin)
Date(seconds: TimeInterval(st_ctimespec.tv_sec), nanoSeconds: TimeInterval(st_ctimespec.tv_nsec))
Date(seconds: TimeInterval(st_birthtimespec.tv_sec), nanoSeconds: TimeInterval(st_birthtimespec.tv_nsec))
#else
Date(seconds: TimeInterval(st_ctim.tv_sec), nanoSeconds: TimeInterval(st_ctim.tv_nsec))
#endif
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18 changes: 18 additions & 0 deletions Tests/FoundationEssentialsTests/FileManager/FileManagerTests.swift
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Expand Up @@ -1093,6 +1093,24 @@ private struct FileManagerTests {
}
#endif

@Test(.enabled(if: isDarwin, "Birth time is only exposed on Darwin"))
func creationDateUsesBirthTime() async throws {
try await FilePlayground {
File("file")
}.test { fileManager in
let attrs1 = try fileManager.attributesOfItem(atPath: "file")
let creation1 = try #require(attrs1[.creationDate] as? Date)

// Mutate metadata to advance ctime without touching birth time
try fileManager.setAttributes([.posixPermissions: 0o600], ofItemAtPath: "file")

let attrs2 = try fileManager.attributesOfItem(atPath: "file")
let creation2 = try #require(attrs2[.creationDate] as? Date)

#expect(creation1 == creation2, "Creation date should remain stable when metadata changes (uses birth time, not ctime)")
}
}

#if canImport(Darwin)
@Test func SearchPathsWithoutExpandingTilde() async throws {
for path in _DarwinSearchPaths(for: .libraryDirectory, in: .userDomainMask, expandTilde: false) {
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