java时区转换 String -> Date -> Calendar -> Instant -> LocalDateTime，用起来感觉很麻烦。

String uploadDate = "2023-01-20T04:46:00+00:00";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
Calendar calendar = Calendar.getInstance();
calendar.setTime(sdf.parse(uploadDate));
LocalDateTime localDateTime = LocalDateTime.ofInstant(calendar.toInstant(), ZoneId.of("Asia/Tokyo"));
System.out.println(localDateTime.getHour());