Converting UTC date format to local nsdate

Something along the following worked for me in Objective-C :

// create dateFormatter with UTC time formatNSDateFormatter *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];

I keep these two websites handy for converting different time formats:http://www.w3.org/TR/NOTE-datetime

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

In Swift it will be:

// create dateFormatter with UTC time format  let dateFormatter = DateFormatter()        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"        dateFormatter.timeZone = NSTimeZone(name: "UTC") as TimeZone?        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 = NSTimeZone.local        let timeStamp = dateFormatter.string(from: date!)

Try this Swift extension

Swift 4: UTC/GMT ⟺ Local (Current/System)

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 itlet utcDate = Date().toGlobalTime()let localDate = utcDate.toLocalTime()print("utcDate - \(utcDate)")        //Print UTC Dateprint("localDate - \(localDate)")     //Print Local Date

Swift version of c_rath answer:

// create dateFormatter with UTC time formatlet 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 zonedateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"dateFormatter.timeZone = NSTimeZone.localTimeZone() let timeStamp = dateFormatter.stringFromDate(date!)