YYYY should be yyyy-
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.ENGLISH);
Please check the documentation for SimpleDateFormat here
Java 6 : http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
Java 7 : http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html