中欧是否有通用的TimeZoneInfo？ [英] Is there a generic TimeZoneInfo For Central Europe?

问题描述

中欧是否存在将CET和CEST都考虑在内的通用TimeZoneInfo？

Is there a generic TimeZoneInfo for Central Europe that takes into consideration both CET and CEST into one?

我有一个执行以下操作的应用程序：

I have an app that is doing the following:

TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById("Central European Standard Time"); 
DateTimeOffset dto = new DateTimeOffset(someDate, tzi.BaseUtcOffset);
var utcDate = dto.ToUniversalTime().DateTime;

问题在于这会返回错误的utcDate，因为BaseUtcOffset是+1而不是+2。看来CET也具有DST，并且取决于一年中的时间，它为+1或+2。

The problem is that this is returning the wrong utcDate because the BaseUtcOffset is +1 instead of +2. It appears that CET has DST as well and depending on the time of the year it is +1 or +2.

推荐答案

首先，我要赞扬mgnoonan使用Noda Time的答案：）但是，如果您不喜欢冒险。 ..

Firstly, I'd like to applaud mgnoonan's answer of using Noda Time :) But if you're feeling less adventurous...

您已经在使用正确的时区-但您不应该使用 BaseUtcOffset （已记录）关于DST：

You're already using the right time zone - but you shouldn't be using BaseUtcOffset which is documented not to be about DST:

获取当前时区的标准时间与协调世界时（UTC）之间的时差。

Gets the time difference between the current time zone's standard time and Coordinated Universal Time (UTC).

当您未为其提供 DateTime 来获取DST时，可能无法考虑DST的偏移量：）

It can't possibly take DST into consideration when you're not providing it a DateTime to fetch the offset for :)

假设 someDate 是 DateTime ，您可以使用：

DateTimeOffset dto = new DateTimeOffset(someDate, tzi.GetUtcOffset(someDate));

或者只是 ConvertTimeToUtc ：

var utcDate = TimeZoneInfo.ConvertTimeToUtc(someDate, tzi);

请注意，如果您的本地时间由于夏令时而发生两次，则应该计算出要执行的操作过渡，或者根本不会发生。

Note that you should work out what you want to do if your local time occurs twice due to a DST transition, or doesn't occur at all.

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