无论本地时区如何，都可以获取另一个时区的日期时间 [英] Get DateTime For Another Time Zone Regardless of Local Time Zone

问题描述

无论用户的本地时区设置为何，使用C＃（.NET 2.0），我需要确定东部时区的时间（DateTime对象）。

Regardless of what the user's local time zone is set to, using C# (.NET 2.0) I need to determine the time (DateTime object) in the Eastern time zone.

我知道这些方法，但是在用户所在的时区不同的时区，似乎并没有明显的方法来获取一个DateTime对象。

I know about these methods but there doesn't seem to be an obvious way to get a DateTime object for a different time zone than what the user is in.

 DateTime.Now
 DateTime.UtcNow
 TimeZone.CurrentTimeZone

当然，这个解决方案需要在夏令时间的意识。

Of course, the solution needs to be daylight savings time aware.

推荐答案

NET 2不包含任何时区信息。
尽管如此，信息存储在注册表中，并且在其周围编写一个包装类是相当微不足道的：

As everyone else mentioned, .NET 2 doesn't contain any time zone information. The information is stored in the registry, though, and its fairly trivial to write a wrapper class around it:

SOFTWARE\Microsoft\Windows NT\\ \\CurrentVersion\TimeZones

SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones

包含所有时区的子键。 TZI字段值包含时区的所有转换和偏置属性，但它都填充在二进制数组中。最重要的位（偏差和日光）分别是位于0和8位置的int32：

contains sub-keys for all time zones. The TZI field value contains all the transition and bias properties for a time zone, but it's all stuffed in a binary array. The most important bits (bias and daylight), are int32s stored at positions 0 and 8 respectively:

int bias = BitConverter.ToInt32((byte[])tzKey.GetValue("TZI"), 0);
int daylightBias = BitConverter.ToInt32((byte[])tzKey.GetValue("TZI"), 8);

此页面有一个合理的摘要：
http://burks.brighton.ac.uk/burks/language/pascal/uddf/pages/registry .htm

This page has a reasonable summary: http://burks.brighton.ac.uk/burks/language/pascal/uddf/pages/registry.htm

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