确定未来的时区转换 [英] Determine future timezone transitions

问题描述

我需要预测下一个至少2个时区转换何时适用于特定时区。

I need to predict when the next at least 2 timezone transitions will be for a particular timezone.

Java 8提供新的 java。时间 API，特别是 java.time.zone 。 ZoneRules.getTransitions（）看起来正是我需要的，但它没有列出2010年以后澳大利亚/悉尼的任何内容。

Java 8 offers the new java.time API, specifically java.time.zone. ZoneRules.getTransitions() looks like exactly what I need however it doesn't list anything beyond the year 2010 for "Australia/Sydney".

确定下2个时区转换的日期/时间/偏移的最可靠方法是什么？

What is the most reliable way to determine the next 2 timezone transition's date/time/offset?

推荐答案

方法 ZoneRules.getTransitions（）未列出所有转换，直到将来无限（显然）。这将获得接下来的两个转换：

The method ZoneRules.getTransitions() doesn't list all transitions until infinity into the future (obviously). This gets the next two transitions:

ZoneId zoneId = ZoneId.of("Australia/Sydney");
ZoneRules rules = zoneId.getRules();

ZoneOffsetTransition nextTransition = rules.nextTransition(Instant.now());
System.out.println("Next transition at: " +
        nextTransition.getInstant().atZone(zoneId));

ZoneOffsetTransition nextNextTransition =
        rules.nextTransition(nextTransition.getInstant());
System.out.println("Next transition after that at: " +
        nextNextTransition.getInstant().atZone(zoneId));

输出：

下一次转换时间：2016-10-02T03：00 + 11:00 [澳大利亚/悉尼]

Next transition at: 2016-10-02T03:00+11:00[Australia/Sydney]

之后的下一次转换：2017-04-02T02： 00 + 10:00 [澳大利亚/悉尼]

Next transition after that at: 2017-04-02T02:00+10:00[Australia/Sydney]

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