Jak uzyskać strefę czasową użytkownika?

Question

Czy ktoś wie, w jaki sposób można uzyskać strefę czasową użytkowników w Swift?

Otrzymuję określony czas, że coś jest na t.v. z bazy danych, a następnie trzeba odjąć/dodać z miejsca, w którym się znajdują, aby pokazać im prawidłowy czas, w którym się znajduje.

Answer 1

edit/update:

Xcode 8 • Swift 3

var secondsFromGMT: Int { return TimeZone.current.secondsFromGMT() } 
secondsFromGMT // -7200 

jeśli trzeba skrót można zrobić tak:

var localTimeZoneAbbreviation: String { return TimeZone.current.abbreviation() ?? "" } 
localTimeZoneAbbreviation // "GMT-2" 

jeśli potrzebujesz nazwy, którą można to zrobić:

var localTimeZoneName: String { return TimeZone.current.identifier } 

localTimeZoneName // "America/Sao_Paulo" 

Jeśli chcesz znać wszystkie strefy czasowe Skróty dostępne można zrobić tak:

var timeZoneAbbreviations: [String:String] { return TimeZone.abbreviationDictionary } 
timeZoneAbbreviations // ["CEST": "Europe/Paris", "WEST": "Europe/Lisbon", "CDT": "America/Chicago", "EET": "Europe/Istanbul", "BRST": "America/Sao_Paulo", "EEST": "Europe/Istanbul", "CET": "Europe/Paris", "MSD": "Europe/Moscow", "MST": "America/Denver", "KST": "Asia/Seoul", "PET": "America/Lima", "NZDT": "Pacific/Auckland", "CLT": "America/Santiago", "HST": "Pacific/Honolulu", "MDT": "America/Denver", "NZST": "Pacific/Auckland", "COT": "America/Bogota", "CST": "America/Chicago", "SGT": "Asia/Singapore", "CAT": "Africa/Harare", "BRT": "America/Sao_Paulo", "WET": "Europe/Lisbon", "IST": "Asia/Calcutta", "HKT": "Asia/Hong_Kong", "GST": "Asia/Dubai", "EDT": "America/New_York", "WIT": "Asia/Jakarta", "UTC": "UTC", "JST": "Asia/Tokyo", "IRST": "Asia/Tehran", "PHT": "Asia/Manila", "AKDT": "America/Juneau", "BST": "Europe/London", "PST": "America/Los_Angeles", "ART": "America/Argentina/Buenos_Aires", "PDT": "America/Los_Angeles", "WAT": "Africa/Lagos", "EST": "America/New_York", "BDT": "Asia/Dhaka", "CLST": "America/Santiago", "AKST": "America/Juneau", "ADT": "America/Halifax", "AST": "America/Halifax", "PKT": "Asia/Karachi", "GMT": "GMT", "ICT": "Asia/Bangkok", "MSK": "Europe/Moscow", "EAT": "Africa/Addis_Ababa"] 

Jeśli chcesz znać nazwy wszystkich strefach czasowych dostępnych można zrobić tak:

var timeZoneIdentifiers: [String] { return TimeZone.knownTimeZoneIdentifiers } 
timeZoneIdentifiers   // ["Africa/Abidjan", "Africa/Accra", "Africa/Addis_Ababa", "Africa/Algiers", "Africa/Asmara", "Africa/Bamako", "Africa/Bangui", "Africa/Banjul", "Africa/Bissau", "Africa/Blantyre", "Africa/Brazzaville", "Africa/Bujumbura", "Africa/Cairo", "Africa/Casablanca", "Africa/Ceuta", "Africa/Conakry", "Africa/Dakar", "Africa/Dar_es_Salaam", "Africa/Djibouti", "Africa/Douala", "Africa/El_Aaiun", "Africa/Freetown", "Africa/Gaborone", "Africa/Harare", "Africa/Johannesburg", "Africa/Juba", "Africa/Kampala", "Africa/Khartoum", "Africa/Kigali", "Africa/Kinshasa", "Africa/Lagos", "Africa/Libreville", "Africa/Lome", "Africa/Luanda", "Africa/Lubumbashi", "Africa/Lusaka", "Africa/Malabo", "Africa/Maputo", "Africa/Maseru", "Africa/Mbabane", "Africa/Mogadishu", "Africa/Monrovia", "Africa/Nairobi", "Africa/Ndjamena", "Africa/Niamey", "Africa/Nouakchott", "Africa/Ouagadougou", "Africa/Porto-Novo", "Africa/Sao_Tome", "Africa/Tripoli", "Africa/Tunis", "Africa/Windhoek", "America/Adak", "America/Anchorage", "America/Anguilla", "America/Antigua", "America/Araguaina", "America/Argentina/Buenos_Aires", "America/Argentina/Catamarca", "America/Argentina/Cordoba", "America/Argentina/Jujuy", "America/Argentina/La_Rioja", "America/Argentina/Mendoza", "America/Argentina/Rio_Gallegos", "America/Argentina/Salta", "America/Argentina/San_Juan", "America/Argentina/San_Luis", "America/Argentina/Tucuman", "America/Argentina/Ushuaia", "America/Aruba", "America/Asuncion", "America/Atikokan", "America/Bahia", "America/Bahia_Banderas", "America/Barbados", "America/Belem", "America/Belize", "America/Blanc-Sablon", "America/Boa_Vista", "America/Bogota", …, "Pacific/Marquesas", "Pacific/Midway", "Pacific/Nauru", "Pacific/Niue", "Pacific/Norfolk", "Pacific/Noumea", "Pacific/Pago_Pago", "Pacific/Palau", "Pacific/Pitcairn", "Pacific/Pohnpei", "Pacific/Ponape", "Pacific/Port_Moresby", "Pacific/Rarotonga", "Pacific/Saipan", "Pacific/Tahiti", "Pacific/Tarawa", "Pacific/Tongatapu", "Pacific/Truk", "Pacific/Wake", "Pacific/Wallis"] 

Nie jest kilka innych informacji może trzeba:

var isDaylightSavingTime: Bool { return TimeZone.current.isDaylightSavingTime(for: Date()) } 
print(isDaylightSavingTime) // true (in effect) 

var daylightSavingTimeOffset: TimeInterval { return TimeZone.current.daylightSavingTimeOffset() } 
print(daylightSavingTimeOffset) // 3600 seconds (1 hour - daylight savings time) 


var nextDaylightSavingTimeTransition: Date? { return TimeZone.current.nextDaylightSavingTimeTransition } // "Feb 18, 2017, 11:00 PM" 
print(nextDaylightSavingTimeTransition?.description(with: .current) ?? "none") 
nextDaylightSavingTimeTransition // "Saturday, February 18, 2017 at 11:00:00 PM Brasilia Standard Time\n" 

var nextDaylightSavingTimeTransitionAfterNext: Date? { 
    guard 
     let nextDaylightSavingTimeTransition = nextDaylightSavingTimeTransition 
     else { return nil } 
    return TimeZone.current.nextDaylightSavingTimeTransition(after: nextDaylightSavingTimeTransition) 
} 

nextDaylightSavingTimeTransitionAfterNext // "Oct 15, 2017, 1:00 AM" 

TimeZone - Apple Developer Swift Documentation

Answer 2

Xcode 8.2.1 • Swift 3.0.2

Locale.availableIdentifiers 
Locale.isoRegionCodes 
Locale.isoCurrencyCodes 
Locale.isoLanguageCodes 
Locale.commonISOCurrencyCodes 

Locale.current.regionCode   // "US" 
Locale.current.languageCode   // "en" 
Locale.current.currencyCode   // "USD" 
Locale.current.currencySymbol  // "$" 
Locale.current.groupingSeparator // "," 
Locale.current.decimalSeparator  // "." 
Locale.current.usesMetricSystem  // false 

Locale.windowsLocaleCode(fromIdentifier: "pt_BR")     // 1,046 
Locale.identifier(fromWindowsLocaleCode: 1046) ?? ""    // "pt_BR" 
Locale.windowsLocaleCode(fromIdentifier: Locale.current.identifier) // 1,033 Note: I am in Brasil but I use "en_US" format with all my devices 
Locale.windowsLocaleCode(fromIdentifier: "en_US")         // 1,033 
Locale.identifier(fromWindowsLocaleCode: 1033) ?? ""        // "en_US" 

Locale(identifier: "en_US_POSIX").localizedString(forLanguageCode: "pt")   // "Portuguese" 
Locale(identifier: "en_US_POSIX").localizedString(forRegionCode: "br")    // "Brazil" 
Locale(identifier: "en_US_POSIX").localizedString(forIdentifier: "pt_BR")   // "Portuguese (Brazil)" 

TimeZone.current.localizedName(for: .standard, locale: .current) ?? ""    // "Brasilia Standard Time" 
TimeZone.current.localizedName(for: .shortStandard, locale: .current) ?? ""   // "GMT-3 
TimeZone.current.localizedName(for: .daylightSaving, locale: .current) ?? ""  // "Brasilia Summer Time" 
TimeZone.current.localizedName(for: .shortDaylightSaving, locale: .current) ?? "" // "GMT-2" 
TimeZone.current.localizedName(for: .generic, locale: .current) ?? ""    // "Brasilia Time" 
TimeZone.current.localizedName(for: .shortGeneric, locale: .current) ?? ""   // "Sao Paulo Time" 

var timeZone: String { 
    return TimeZone.current.localizedName(for: TimeZone.current.isDaylightSavingTime() ? 
               .daylightSaving : 
               .standard, 
              locale: .current) ?? "" } 

timeZone  // "Brasilia Summer Time" 

Answer 3

NSTimeZone *timeZone = [NSTimeZone localTimeZone]; 
NSString *tzName = [timeZone name]; 

Nazwa będzie coś jak "Australia/Sydney" lub "Europe/Lizbony".

Ponieważ wygląda na to, że interesuje Cię tylko kontynent, może to być wszystko, czego potrzebujesz.