title: How to get UTC appended in NSDate
body: <p>So currently I have this extension for Formatter which returns : 16/10/17 08:37:50 PM GMT but I need 16/10/17 08:37:50 PM <strong>UTC</strong> with UTC as appended to the nsdate. How can I achieve that? </p>
  
  <p>Following is my code: </p>
  
  <pre><code>extension Formatter {
  static let iso8601: DateFormatter = {
      let formatter = DateFormatter()
      formatter.calendar = Calendar(identifier: .iso8601)
      formatter.locale = Locale(identifier: "en_US_POSIX")
      formatter.timeZone = NSTimeZone(abbreviation:"UTC") as TimeZone!
      formatter.amSymbol = "AM"
      formatter.pmSymbol = "PM"
      formatter.dateFormat = "dd/MM/yy hh:mm:ss a zzz"
      return formatter
  }()
  }
  </code></pre>