             minute following the receiver.
     */
     public func minuteAfter() -> NSDate {
-        return TimeUnit().minuteAfter(self)
+        return TimeUnit.minuteAfter(self)
     }
     
     /**

            hour prior to the receiver.
    */
    public func hourBefore() -> NSDate {
        return TimeUnit().hourBefore(self)
    }
    
    /**

            minute as the receiver.
    */
    public func beginningOfMinute() -> NSDate {
        return TimeUnit.beginningOfMinute(self)
    }
    
    /**
