41 lines
1.4 KiB
Swift
41 lines
1.4 KiB
Swift
import Foundation
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public enum DubaiTime {
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private static let stampFormatter = LockedDateFormatter(dateFormat: "d MMM yyyy, HH:mm 'Dubai'")
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private static let fileStampFormatter = LockedDateFormatter(dateFormat: "yyyyMMdd-HHmmss")
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public static func stamp(_ date: Date) -> String {
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stampFormatter.string(from: date)
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}
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public static func fileStamp(_ date: Date) -> String {
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fileStampFormatter.string(from: date)
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}
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}
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/// DateFormatter is not Sendable. This holder is the only shared mutable state
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/// around a formatter: every read is serialized by the lock, so concurrent
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/// calls (one per PDF page) cannot race.
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private final class LockedDateFormatter: @unchecked Sendable {
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private let lock = NSLock()
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private let formatter: DateFormatter
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init(dateFormat: String) {
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let formatter = DateFormatter()
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formatter.calendar = Calendar(identifier: .gregorian)
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formatter.locale = Locale(identifier: "en_GB")
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guard let dubai = TimeZone(identifier: "Asia/Dubai") else {
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preconditionFailure("The Asia/Dubai time zone is missing from this system.")
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}
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formatter.timeZone = dubai
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formatter.dateFormat = dateFormat
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self.formatter = formatter
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}
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func string(from date: Date) -> String {
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lock.lock()
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defer { lock.unlock() }
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return formatter.string(from: date)
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}
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}
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