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47c62e35c8
Currently we implement adding units larger than `.day` as follows: - Convert the date to date components - Update the value of the added component - Convert the date components back to date The time of the day information is reduced to a `DateComponents` with, e.g. `hour == 1`, `minute == 30`, at step 1. Then when we convert the `DateComponents` back to `Date` at step 3, we always use the *first* occurrence of the time if it falls into the DST repeated time frame. This is different from `Calendar_ICU`'s implementation, which uses the *latter* and rewind back the date by the DST transition interval (e.g. 1 hour for Pacific Time). These yeild the same result except for when the input time and the output time are *both* during DST transition time frame. Update the implementation to match Calendar_ICU's behavior.
64 lines
2.5 KiB
Swift
64 lines
2.5 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// Required to be `AnyObject` because it optimizes the call sites in the `struct` wrapper for efficient function dispatch.
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package protocol _TimeZoneProtocol : AnyObject, Sendable, CustomDebugStringConvertible {
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init?(secondsFromGMT: Int)
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init?(identifier: String)
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var identifier: String { get }
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func secondsFromGMT(for date: Date) -> Int
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/// Essentially this is equivalent to adjusting `date` to this time zone using `rawOffset`, then passing the adjusted date to `daylightSavingTimeOffset(for: <adjusted date>)`.
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/// This also handles the skipped time frame on DST start day differently from `daylightSavingTimeOffset(:)`, where dates in the skipped time frame are considered *not* in DST here, hence the DST offset would be 0.
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func rawAndDaylightSavingTimeOffset(for date: Date, repeatedTimePolicy: TimeZone.DaylightSavingTimePolicy, skippedTimePolicy: TimeZone.DaylightSavingTimePolicy) -> (rawOffset: Int, daylightSavingOffset: TimeInterval)
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func abbreviation(for date: Date) -> String?
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func isDaylightSavingTime(for date: Date) -> Bool
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func daylightSavingTimeOffset(for date: Date) -> TimeInterval
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func nextDaylightSavingTimeTransition(after date: Date) -> Date?
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func localizedName(for style: TimeZone.NameStyle, locale: Locale?) -> String?
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// Used by legacy ObjC clients only
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var data: Data? { get }
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var isAutoupdating: Bool { get }
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var debugDescription: String { get }
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func hash(into hasher: inout Hasher)
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#if FOUNDATION_FRAMEWORK
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func bridgeToNSTimeZone() -> NSTimeZone
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#endif
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}
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extension _TimeZoneProtocol {
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package var data: Data? {
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nil
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}
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package var isAutoupdating: Bool {
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false
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}
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package var debugDescription: String {
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identifier
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}
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package func hash(into hasher: inout Hasher) {
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hasher.combine(identifier)
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}
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#if FOUNDATION_FRAMEWORK
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package func bridgeToNSTimeZone() -> NSTimeZone {
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_NSSwiftTimeZone(timeZone: TimeZone(inner: self))
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}
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#endif
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}
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