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()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)。
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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