Swift 3 Handling user device change

userDeviceChangeObserver.swift

// Creates the notifcation constant 
let notification = Notification.Name("NSSystemClockDidChangeNotification")

// Add this within your viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(handleTimeChange), name: notification, object: nil)

// Place this within the view controller where the above is added
@objc private func handleTimeChange() {
  // Add anything you need in here
  NotificationCenter.default.removeObserver(self, name: notification, object: nil);
}