[Windows] Fix incorrect TimeZone.current lookup logic
#975
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@swift-ci please test |
parkera
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compnerd
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| let result: String? = timeZoneIdentifier.withUnsafeBufferPointer { identifier in | ||
| return _withResizingUCharBuffer { buffer, size, status in | ||
| let len = ucal_getTimeZoneIDForWindowsID(identifier.baseAddress, Int32(identifier.count), nil, buffer, size, &status) | ||
| if status.isSuccess { |
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return status.isSuccess ? len : nil feels like a better way to write this.
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Yeah that seems fine too, I was just copying the format of the above getCanonicalTimeZoneID function for consistency
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swiftlang#975 started to restrict the fallback value for `TZDIR` and it revealed that WASI platform implicitly depends on TZDIR even though it won't have such directory. This patch explicitly handles the case for WASI platform for timezone operations.
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#975 started to restrict the fallback value for `TZDIR` and it revealed that WASI platform implicitly depends on TZDIR even though it won't have such directory. This patch explicitly handles the case for WASI platform for timezone operations.
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swiftlang#975 started to restrict the fallback value for `TZDIR` and it revealed that WASI platform implicitly depends on TZDIR even though it won't have such directory. This patch explicitly handles the case for WASI platform for timezone operations.
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The current implementation of
TimeZone.currentattempts to read from/etc/localtimewhich is not a path that exists on Windows. This leads toTimeZone.currentalways being GMT on Windows. Instead, this updates the implementation to callGetTimeZoneInformation, convert the Windows name to an ICU system timezone name, and initialize a timezone with that name (this matches the behavior ofTimeZoneon Swift 5.10 when it was based onCFTimeZone). This also restricts the default values forTZDEFAULT/TZDIRto Darwin + Linux where the paths are reasonable unlike Windows where we know these constants should never exist to avoid accidental usage in the future.There's likely more work to be done here for Windows for a full solution (to allow in some way for developers to interface with Windows time zone identifiers so that
TimeZonecan interop with Windows system APIs) but this change at least fixes the critical issue and restores the Swift 5.10 behavior, we can look into adding additional API for working with Windows time zone identifiers in the future.Resolves #966, rdar://137451317