为什么 IsDaylightSavingTime 返回不同的值？

发布于 2024-09-30 04:49:32 字数 726 浏览 3 评论 0原文

我有一段代码可以检查时间，然后根据夏令时值添加小时数。

Dim CommentDateTime as Date = "11/2/2010 8:21:42 PM"
If CommentDateTime.IsDaylightSavingTime Then
   'do something
Else
   'do something else
End If

我遇到的问题是 IsDaylightSavingTime 在生产服务器上的行为与在开发服务器上的行为不同。

在开发服务器上，情况是正确的，但在生产服务器上，情况是错误的。

两台服务器都运行相同的操作系统，并且都运行 .NET 3.5

我可以向 SA 提供哪些信息来帮助解决我的问题？

更新：

生产服务器位于亚利桑那州，该州不遵守夏令时。我只关心知道某个日期/时间在美国其他遵守该日期/时间的地区是否为夏令时。

以下是我解决问题的方法：

If TimeZoneInfo.FindSystemTimeZoneById("Pacific StandardTime").IsDaylightSavingTime(CommentDateTime) Then
     'Do something
Else
     'Do something else
End If

我的应用程序仅处理位于美国的位置，因此这应该可以解决问题。

原文

I have a piece of code that checks a time and then adds hours based on the daylight savings time value.

Dim CommentDateTime as Date = "11/2/2010 8:21:42 PM"
If CommentDateTime.IsDaylightSavingTime Then
   'do something
Else
   'do something else
End If

The problem that I'm having is that IsDaylightSavingTime behaves differently on the production server than it does on the development.

On the development server the case is TRUE, but on the production it is false.

Both servers are running the same OS and are both running .NET 3.5

What information can I give to the SA to help troubleshoot my issue?

UPDATE:

The production server is in Arizona, a state that does not observe DST. I'm only concerned with knowing if a certain date/time is DST in the rest of the US that does observe it.

Here's how I fixed the problem:

If TimeZoneInfo.FindSystemTimeZoneById("Pacific StandardTime").IsDaylightSavingTime(CommentDateTime) Then
     'Do something
Else
     'Do something else
End If

My application only deals with locations located in the US, so this should do the trick.

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