iPhone NSTimeZone：localTimeZone混乱 [英] iPhone NSTimeZone: localTimeZone confusion

问题描述

根据我的理解，致电

NSLog(@"Local Time Zone %@",[[NSTimeZone localTimeZone] name]);

为您提供设备的本地时区。它给我的是US / Central，我在 [NSTimeZone abbreviationDictionary] 的缩写列表或时区列表中的任何位置都找不到 [NSTimeZone knownTimeZoneNames] 中的名称。这个来自哪里？我需要将当前设备时区传递给Rails应用程序，它理解澳大利亚/悉尼或America / Chicago等内容，但不是 美/中环。

gives you the local time zone of the device. What it's giving me is "US/Central", and I can't find that anywhere in the list of abbreviations in [NSTimeZone abbreviationDictionary], or the list of time zone names in [NSTimeZone knownTimeZoneNames]. Where is this one coming from? I need to pass the current device time zone to a Rails app, and it understands things like "Australia/Sydney" or "America/Chicago", but not "US/Central".

我如何获取localTimeZone给我的内容并将其转换为Rails可以理解的字符串（即knownTimeZoneNames中的任何时区，假设是系统知道的所有时区名称？）

How do I take what localTimeZone is giving me and convert it to a string that Rails can understand (i.e. any time zone in knownTimeZoneNames, which is supposed to be all time zone names that the system knows about?)

推荐答案

你可能正在使用 ActiveSupport :: TimeWithZone ，无需 tzinfo gem：

You're likely using ActiveSupport::TimeWithZone without having required the tzinfo gem:

$ irb -rrubygems -ractivesupport -rtzinfo
>> Time.send(:get_zone, "US/Central").now
=> Tue, 17 Nov 2009 04:27:23 CST -06:00

如果您不需要 tzinfo ，你只会获得一些相当无用的时区子集。

If you don't require tzinfo, you'll only get a subset of timezones which is fairly useless.

编辑 ：为了避免混淆，我使用私有时间#get_zone API的原因是因为当你打电话时，幕后使用的是什么时间＃区= 。如果您不需要 tzinfo ，则调用 Time.send（：get_zone，US / Central）返回 nil 。

EDIT: Just to avoid confusion, the reason I used the private Time#get_zone API is because that's what's being used behind the scenes when you call Time#zone=. If you don't require tzinfo, calling Time.send(:get_zone, "US/Central") returns nil.

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