How to make a countdown to date Swift

Question

I was facing the struggle of making a timer app, so I thought that now that I solved it I could help others who face the problem. So basically this app counts down to a specific

Answer 1

This worked for me. The only thing that troubles me is that it doesn't really countdown as the user has to refresh the page for it to recount. You can see it "counting" when the user is scrolling up and down cells on a UITableView as the cells do refresh the view. Another thing is that I have on NSTimeZone of the currentDate "GMT+2:00" as it works for my time but only because I haven't figured out how to use the device NSTimeZone yet.

    let releaseDate = "2015-05-02'T'22:00:00:000Z"
    let futureDateFormatter = NSDateFormatter()
    futureDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
    let date: NSDate = futureDateFormatter.dateFromString(releaseDate!)!

    let currentDate = NSDate();
    let currentFormatter = NSDateFormatter();
    currentFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
    currentFormatter.timeZone = NSTimeZone(abbreviation: "GMT+2:00")

    let diffDateComponents = NSCalendar.currentCalendar().components([NSCalendarUnit.Month, NSCalendarUnit.Day, NSCalendarUnit.Hour, NSCalendarUnit.Minute], fromDate: currentDate, toDate: date, options: NSCalendarOptions.init(rawValue: 0))

    let countdown = "\(diffDateComponents.month) m: \(diffDateComponents.day) d: \(diffDateComponents.hour) h: \(diffDateComponents.minute) min"