java unsupport_java-UnsupportedTemporalTypeException：不支持的字...

我有这段代码正在生成一个时间戳,然后解析.

DateTimeFormatter formatter =

DateTimeFormatter

.ofPattern("yyyyMMdd kk:HH:ss.SSSZ")

.withLocale(Locale.getDefault())

.withZone(ZoneId.systemDefault());

Instant now = Instant.now();

String formatted = formatter.format(now);

Instant parsed = formatter.parse(formatted, Instant::from);

运行时,最后一行会产生异常：

java.time.format.DateTimeParseException: Text '20180123 12:12:45.648-0500' could not be parsed: Unable to obtain Instant from TemporalAccessor: {SecondOfMinute=45, NanoOfSecond=648000000, OffsetSeconds=-18000, MilliOfSecond=648, MicroOfSecond=648000, HourOfDay=12},ISO,America/New_York resolved to 2018-01-23 of type java.time.format.Parsed

Caused by: java.time.DateTimeException: Unable to obtain Instant from TemporalAccessor: {SecondOfMinute=45, NanoOfSecond=648000000, OffsetSeconds=-18000, MilliOfSecond=648, MicroOfSecond=648000, HourOfDay=12},ISO,America/New_York resolved to 2018-01-23 of type java.time.format.Parsed

Caused by: java.time.temporal.UnsupportedTemporalTypeException: **Unsupported field: InstantSeconds**

我用DateTimeFormatter.ISO_INSTANT替换了格式化程序,它可以正常工作.产生的实际数据几乎相同.什么是断开连接？

ISO_INSTANT: 2018-01-23T16:51:25.516Z

My Format: 20180119 23:59:59.999-0800

我必须使用我的格式.这里有什么问题？