java 如何将 Instant 转换为 LocalTime？
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How to convert a Instant to a LocalTime?
提问by Connorelsea
I'm not really understanding Temporal Adjusters or Java's new time library even after reading numerous tutorials.
即使在阅读了大量教程之后，我也没有真正理解 Temporal Adjusters 或 Java 的新时间库。
How would I convert an Instant object to a LocalTime object. I was thinking something along the lines of the following:
我如何将 Instant 对象转换为 LocalTime 对象。我在想以下几点：
LocalTime time = LocalTime.of(
instantStart.get(ChronoField.HOUR_OF_DAY),
instantStart.get(ChronoField.MINUTE_OF_HOUR)
);
But it isn't working. How would I do this?
但它不起作用。我该怎么做？
回答by Adam
The way I understand it... Instant is a UTC style time, agnostic of zone always UTC. LocaleTime is time at a given zone. So you'd expect the following would work given that Instant implements TemporalAccessor,
我理解它的方式...... Instant 是 UTC 风格的时间，区域不可知，总是 UTC。LocaleTime 是给定区域的时间。因此，鉴于 Instant 实现了 TemporalAccessor，您希望以下内容有效，
Instant instant = Instant.now();
LocalTime local = LocalTime.from(instant);
but you get "Unable to obtain LocalTime from TemporalAccessor" error. Instead you need to state where "local" is. There is no default - probably a good thing.
但您收到“无法从 TemporalAccessor 获取 LocalTime”错误。相反，您需要说明“本地”在哪里。没有默认值 - 可能是一件好事。
Instant instant = Instant.now();
LocalTime local = LocalTime.from(instant.atZone(ZoneId.of("GMT+3")));
System.out.println(String.format("%s => %s", instant, local));
Output
输出
2014-12-07T07:52:43.900Z => 10:52:43.900
instantStart.get(ChronoField.HOUR_OF_DAY) throws an error because it does not conceptually support it, you can only access HOUR_OF_DAY etc. via a LocalTime instance.
InstantStart.get(ChronoField.HOUR_OF_DAY) 抛出错误，因为它在概念上不支持它，您只能通过 LocalTime 实例访问 HOUR_OF_DAY 等。
