code: public static DateFormat registerDateFormat(String format) {
  		return registerDateFormat(format, new SimpleDateFormat(format, Locale.ENGLISH));
  	}
docs: Add the format string as {@link SimpleDateFormat} using English as locale.
  The format can be removed by the format string.
  If you need a different locale use {@link #registerDateFormat(String, DateFormat)}.
  @param format {@link SimpleDateFormat#SimpleDateFormat(String)}