Convert UTC to local time with NSDateFormatter

Question

I am getting the following string from a server in my iOS app:

20140621-061250

How can I convert it to the local time?

Answer 1

One possible solution in Swift using NSDate extension (maybe it could help future viewers of this question):

import UIKit

// For your personal information: NSDate() initializer 
// always returns a date in UTC, no matter the time zone specified.
extension NSDate {
    // Convert UTC (or GMT) to local time
    func toLocalTime() -> NSDate {
        let timezone: NSTimeZone = NSTimeZone.localTimeZone()
        let seconds: NSTimeInterval = NSTimeInterval(timezone.secondsFromGMTForDate(self))
        return NSDate(timeInterval: seconds, sinceDate: self)
    }

    // Convert local time to UTC (or GMT)
    func toGlobalTime() -> NSDate {
        let timezone: NSTimeZone = NSTimeZone.localTimeZone()
        let seconds: NSTimeInterval = -NSTimeInterval(timezone.secondsFromGMTForDate(self))
        return NSDate(timeInterval: seconds, sinceDate: self)
    }
}