我正在尝试使用java.time.format.DateTimeFormatter解析日期,如"2017-04-03 19:16:16/GMT“,并得到java.time.format.DateTimeParseException: Text '2017-04-03 19:16:19 Etc/GMT' could not be parsed at index 20。DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss zzz