ios - Conversión de formato de fecha UTC a nsdate local

swift timezone

Question

Estoy obteniendo de mi servidor una fecha de cadena en la zona horaria UTC y necesito convertirla a la zona horaria local.

MI CÓDIGO:

let utcTime = "2015-04-01T11:42:00.269Z"    
let dateFormatter = NSDateFormatter()
dateFormatter.timeZone = NSTimeZone(name: "UTC")
dateFormatter.dateFormat = "yyyy-MM-dd''T''HH:mm:ss.SSS''Z''"
let date = dateFormatter.dateFromString(utcTime)
println("utc: /(utcTime), date: /(date)")

esto imprime -

utc: 2015-04-01T11: 42: 00.269Z, fecha: Opcional (2015-04-01 11:42:00 +0000)

si elimino

dateFormatter.timeZone = NSTimeZone(name: "UTC") 

imprime

utc: 2015-04-01T11: 42: 00.269Z, fecha: Opcional (2015-04-01 08:42:00 +0000)

mi zona horaria local es UTC +3 y en la primera opción obtengo UTC en la segunda opción obtengo UTC -3

Debería obtener

utc: 2015-04-01T11: 42: 00.269Z, fecha: Opcional (2015-04-01 14:42:00 +0000)

Entonces, ¿cómo convierto el formato de fecha UTC a la hora local?

Answer 1

Algo similar me funcionó en Objective-C:

// create dateFormatter with UTC time format
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd''T''HH:mm:ss"]; 
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
NSDate *date = [dateFormatter dateFromString:@"2015-04-01T11:42:00"]; // create date from string

// change to a readable time format and change to local time zone
[dateFormatter setDateFormat:@"EEE, MMM d, yyyy - h:mm a"];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *timestamp = [dateFormatter stringFromDate:date];

Guardo estos dos sitios web útiles para convertir diferentes formatos de tiempo: http://www.w3.org/TR/NOTE-datetime

http://benscheirman.com/2010/06/dealing-with-dates-time-zones-in-objective-c/

En Swift será:

// create dateFormatter with UTC time format
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd''T''HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date = dateFormatter.dateFromString("2015-04-01T11:42:00")// create   date from string

// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
let timeStamp = dateFormatter.stringFromDate(date!)

Answer 2

Ampliando lo que otros han mencionado, aquí hay una práctica extensión de NSDate en Swift

import Foundation

extension NSDate {
    func ToLocalStringWithFormat(dateFormat: String) -> String {
        // change to a readable time format and change to local time zone
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = dateFormat
        dateFormatter.timeZone = NSTimeZone.localTimeZone()
        let timeStamp = dateFormatter.stringFromDate(self)

        return timeStamp
    }
}

Answer 3

En Swift 3 esto funciona bien:

// create dateFormatter with UTC time format
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd''T''HH:mm:ss"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
let date = dateFormatter.date(from: "2015-04-01T11:42:00")// create date from string

// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = TimeZone.current
let timeStamp = dateFormatter.string(from: date!)

Answer 4

Prueba esta extensión Swift

Swift 4 : UTC / GMT ⟺ Local (Actual / Sistema)

extension Date {

    // Convert local time to UTC (or GMT)
    func toGlobalTime() -> Date {
        let timezone = TimeZone.current
        let seconds = -TimeInterval(timezone.secondsFromGMT(for: self))
        return Date(timeInterval: seconds, since: self)
    }

    // Convert UTC (or GMT) to local time
    func toLocalTime() -> Date {
        let timezone = TimeZone.current
        let seconds = TimeInterval(timezone.secondsFromGMT(for: self))
        return Date(timeInterval: seconds, since: self)
    }

}


// Try it
let utcDate = Date().toGlobalTime()
let localDate = utcDate.toLocalTime()

print("utcDate - (utcDate)")
print("localDate - (localDate)")

Answer 5

Tal vez puedas probar algo como:

extension NSDate {
    convenience init(utcDate:String, dateFormat:String="yyyy-MM-dd HH:mm:ss.SSS+00:00") {
        // 2016-06-06 00:24:21.164493+00:00
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = dateFormat
        dateFormatter.timeZone = NSTimeZone(name: "UTC")

        let date = dateFormatter.dateFromString(utcDate)!
        let s = NSTimeZone.localTimeZone().secondsFromGMTForDate(date)
        let timeInterval = NSTimeInterval(s)

        self.init(timeInterval: timeInterval, sinceDate:date)
    }
}

Answer 6

Tuve que eliminar tanto z como mili segundos de la solución c_rath. Funciona a gran velocidad 4.

extension String {
    func fromUTCToLocalDateTime() -> String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd''T''HH:mm:ss"
        dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
        var formattedString = self.replacingOccurrences(of: "Z", with: "")
        if let lowerBound = formattedString.range(of: ".")?.lowerBound {
            formattedString = "/(formattedString[..<lowerBound])"
        }

        guard let date = dateFormatter.date(from: formattedString) else {
            return self
        }

        dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
        dateFormatter.timeZone = TimeZone.current
        return dateFormatter.string(from: date)
    }
}

Answer 7

Versión rápida de la respuesta c_rath:

// create dateFormatter with UTC time format
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd''T''HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date = dateFormatter.dateFromString("2015-04-01T11:42:00")

// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.localTimeZone() 
let timeStamp = dateFormatter.stringFromDate(date!)