如何获取不同时区的LocalTime？ [英] How to get LocalTime at different time-zone?

问题描述

我知道LocalTime与时区无关。但我想获得中部标准时间（CST）的小时数。我所得到的只是时间在字符串中：

I understand that LocalTime is time-zone agnostic. But I would like to get hours in Central Standard Time (CST). All I am given is time in String:

String start = "11:00" //11 am CST. 
LocalTime startTime = LocalTime.parse(start);

这很好，但是服务器在不同时区运行。因此它将解释为世界标准时间上午11点。我希望LocalTime在CST中。我需要在CST中进行调用，以便可以调用LocalTime.isAfter方法。

This is good but server is running in different time-zone. So it will interpret it as 11 am UTC. I want LocalTime to be in CST. I need to in CST so I can invoke LocalTime.isAfter methods.

LocalTime currentTime = LocalTime.now();
boolean afterEleven = currentTime.isAfter(startTime);

推荐答案

LocalDateTime.now（） 实际上是 LocalDateTime.now（Clock.systemDefaultZone（））的快捷方式，其中 Clock.class 代表某个日期时间瞬间（参阅文档）和静态方法 systemDefaultZone（）返回PC的日期时间点。

LocalDateTime.now() is actually a shortcut for LocalDateTime.now(Clock.systemDefaultZone()), where Clock.class represents some date-time instant (see docs), and static method systemDefaultZone() returns the date-time instant of your PC.

在您的情况下，可以在其他区域使用时钟（ID为 CST的区域不存在，但是您可以选择 America / Chicago）-请参阅说明在此答案中）。

In your case it's possible to use "clock" for a different zone (zone with id="CST" doesn't exist but you can choose "America/Chicago" instead - see explanation in this answer).

LocalTime currentTime = LocalTime.now(Clock.system(ZoneId.of("America/Chicago")));

UPD 无法正确理解任务。在这种情况下，将 currentTime 而不是 startTime 转换为所需区域实际上更容易。

UPD Didn't understand the task properly. In this case it's actually easier to convert currentTime instead of startTime to needed zone.

LocalTime currentTime = LocalTime.now(Clock.system(ZoneId.of("Europe/London")));

或作为Ole V.V.提醒：

or, as Ole V.V. reminded:

LocalTime currentTime = LocalTime.now(ZoneId.of("Europe/London"));

然后可以将其与未修改的 startTime 进行比较（在这种情况下-11:00）

then you can compare it with unmodified startTime (in this case - 11:00)

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