确定指定日期的Java夏令时（DST）是否处于活动状态 [英] Determine Whether Daylight Savings Time (DST) is Active in Java for a Specified Date

问题描述

我有一个Java类，它接收位置的纬度/经度，并在夏令时开启和关闭时返回GMT偏移。我正在寻找一种简单的方法来确定Java中当前日期是否为夏令时，因此我可以应用正确的偏移量。目前我只对美国时区执行此计算，但最终我还想将其扩展到全球时区。

I have a Java class that takes in the latitude/longitude of a location and returns the GMT offset when daylight savings time is on and off. I am looking for an easy way to determine in Java if the current date is in daylight savings time so I can apply the correct offset. Currently I am only performing this calculation for U.S. timezones although eventually I would like to expand this to global timezones as well.

推荐答案

这是询问问题的机器的答案：

This is the answer for the machine on which the question is being asked:

TimeZone.getDefault().inDaylightTime( new Date() );

试图为客户解决这个问题的服务器需要客户端的时区。请参阅@Powerlord答案。

A server trying to figure this out for a client will need the client's time zone. See @Powerlord answer for the reason why.

对于任何特定的TimeZone

For any particular TimeZone

TimeZone.getTimeZone( "US/Alaska").inDaylightTime( new Date() );

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