unrecognized selector sent to instance siwft :    I'm getting server time using Alamofire, 
And with NSTimer I refresh this time every second.

But I get error 

> unrecognized selector sent to instance 0x7ff4636126a0'

and also if I change selector to 

> selector: "getTime:"

 , it gives me an error like this.

[![enter image description here][1]][1]


How should I fix it?

This is my code.



        import UIKit
        import Alamofire
        
        typealias DownloadComplete = () -> ()
        
        class ViewController: UIViewController {
        
            @IBOutlet var currentTime: UILabel!
            var stringDateFromServer = String()
            let dateFormatter = NSDateFormatter()
            
            override func viewDidLoad() {
                super.viewDidLoad()
        
                getTime { () -> () in
                    
                    self.dateFormatter.dateFormat = "EEE, dd MMM yyyy HH:mm:ss zzz"
                    self.dateFormatter.locale = NSLocale(localeIdentifier: "en_US")
                    
                    let date2 = self.dateFormatter.dateFromString(self.stringDateFromServer)!
                    
                    self.dateFormatter.locale = NSLocale.currentLocale()
                    let date3 = self.dateFormatter.stringFromDate(date2)
                    
                    self.currentTime.text = date3
                }
                
                NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "getTime", userInfo: nil, repeats: true)
        
            }
            
            func getTime(completed: DownloadComplete) {
                
                let url = NSURL(string: "http://google.com")!
                
                Alamofire.request(.HEAD, url).responseJSON { (Response) -> Void in
                
                    let result = Response.response
                    
                    if let headers = result?.allHeaderFields {
                        if let date = headers["Date"] as? String {
                            self.stringDateFromServer = date
        
                            }
                        }
                     completed()
                }
            }
                
        }


  [1]: http://i.stack.imgur.com/dCItg.png