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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"))
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@jmschonfeld jmschonfeld Jan 14, 2026

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Is there a reason that we should limit this test to Darwin platforms? I know Darwin platforms are the ones that don't pass this test today, but we should expect platforms like Linux and Windows to pass this test as well, right?

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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