如何将ZonedDateTime格式化为yyyy-MM-ddZ

I need to turn ZonedDateTime to XML Date data type, of format yyyy-MM-ddZ. For example: 2020-02-14Z. I try to use DateTimeFormatter.ofPattern("yyyy-MM-ddZ") but the output is: 2020-02-14+0000. Which DateTimeFormatter pattern should I use to get the desired...