Date / Time / Calendar / Time zone

Presentation about classes from iOS SDK: Date / Time / Calendar / Time zone

Transcript

1. Date / Time / Calendar / Time zone Date / Time / Calendar / Time zone
2. 60, 3600, 86 400 Date / Time / Calendar / Time zone
3. Date / Time / Calendar / Time zone
4. 60, 3600, 86 400 60 * 60 (60 * 60 * 7, 60 * 60 * 17) [2, 3, 4, 5, 6]
5. 60, 3600, 86 400 // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) }
6. 60, 3600, 86 400 // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) } let dayInterval = TimeInterval(60 * 60 * 24)
7. 60, 3600, 86 400 // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) } let tomorrow = Date().addingTimeInterval(dayInterval)
8. 60, 3600, 86 400 // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) } guard let endOfTomorrow = tomorrow.endOfDay else { return false }
9. 60, 3600, 86 400 // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow)
10. System API’s to the rescue! System API’s to the rescue!
11. System API’s to the rescue! Session 124: Understanding Foundation, WWDC 2010
12. Date Date
13. Date Date() init(timeIntervalSinceNow: TimeInterval) init(timeInterval: TimeInterval, since: Date)
14. Date init(timeIntervalSinceReferenceDate: TimeInterval) // reference date: 00:00:00 UTC on 1 January 2001 init(timeIntervalSince1970: TimeInterval) // Unix Epoch: 00:00:00 UTC on 1 January 1970
15. Calendar Calendar
16. Calendar Calendar.current Calendar.autoupdatingCurrent
17. TimeZone TimeZone
18. TimeZone init?(secondsFromGMT seconds: Int) // 3600
19. TimeZone init?(abbreviation: String) // CET, CEST init?(identifier: String) // „Europe/Warsaw” a.k.a tz database
20. DateComponents DateComponents
21. DateComponents let calendar = Calendar.current let timezone = TimeZone(identifier: "Europe/Warsaw") var dateComps = DateComponents() dateComps.calendar = calendar dateComps.year = 2017 dateComps.month = 5 dateComps.day = 25 dateComps.hour = 19 dateComps.timeZone = timezone let dateToPrint = dateComps.date! print("Date: \(dateToPrint)”) // Date: 2017-05-25 17:00:00 +0000
22. DateComponents let calendar = Calendar.current let timezone = TimeZone(identifier: "Europe/Warsaw") var dateComps = DateComponents() dateComps.calendar = calendar dateComps.year = 2017 dateComps.month = 5 dateComps.day = 25 dateComps.hour = 19 dateComps.timeZone = timezone let dateToPrint = dateComps.date! print("Date: \(dateToPrint)”) // Date: 2017-05-25 17:00:00 +0000 var dateComps = DateComponents() dateComps.calendar = calendar dateComps.year = 2017 dateComps.month = 5 dateComps.day = 25 dateComps.hour = 19 dateComps.timeZone = timezone
23. DateComponents let calendar = Calendar.current let timezone = TimeZone(identifier: "America/Los_Angeles") var dateComps = DateComponents() dateComps.calendar = calendar dateComps.year = 2017 dateComps.month = 5 dateComps.day = 25 dateComps.hour = 19 dateComps.timeZone = timezone let dateToPrint = dateComps.date! print("Date: \(dateToPrint)”) // Date: 2017-05-26 02:00:00 +0000 let dateToPrint = dateComps.date! print("Date: \(dateToPrint)”) // Date: 2017-05-26 02:00:00 +0000
24. DateComponents let now = Date() var comps = DateComponents() comps.month = -1 comps.day = -1 comps.hour = -1 comps.timeZone = timezone let calendar = Calendar.current let newDate = calendar.date(byAdding: comps, to: now) // Apr 24, 2017, 5:30 PM let now = Date() var comps = DateComponents() comps.month = -1 comps.day = -1 comps.hour = -1 comps.timeZone = timezone
25. DateComponents let now = Date() var comps = DateComponents() comps.month = -1 comps.day = -1 comps.hour = -1 comps.timeZone = timezone let calendar = Calendar.current let newDate = calendar.date(byAdding: comps, to: now) // Apr 24, 2017, 5:30 PM let calendar = Calendar.current let newDate = calendar.date(byAdding: comps, to: now) // Apr 24, 2017, 5:30 PM
26. DateFormatter DateComponents
27. DateFormatter
28. DateFormatter let now = Date(timeIntervalSince1970: 1495737000) let formatter = DateFormatter() formatter.locale = Locale.autoupdatingCurrent formatter.dateStyle = .medium formatter.timeStyle = .medium let output = formatter.string(from: now) // shorter version: DateFormatter.localizedString(from: now, dateStyle: .medium, timeStyle: .medium) // "May 25, 2017, 8:30:00 PM" // "2017年年5⽉月25⽇日 下午8:30:00"
29. So… DateComponents
30. So… let tuple = (60 * 60 * 7, 60 * 60 * 17) var sevenAM = DateComponents() sevenAM.hour = 7 sevenAM.minute = 00 var fivePM = DateComponents() sevenAM.hour = 17 sevenAM.minute = 00
31. So… let weekdays = [2, 3, 4, 5, 6] calendar.isDateInWeekend(myDate)
32. So… // extension Date var isTomorrow: Bool { let dayInterval = TimeInterval(60 * 60 * 24) let tomorrow = Date().addingTimeInterval(dayInterval) guard let endOfTomorrow = tomorrow.endOfDay else { return false } return isBetween(startDate: tomorrow.startOfDay, endDate: endOfTomorrow) } calendar.isDateInTomorrow(myDate)
33. Pikor @pikorpikorpikor