什么时候你喜欢DateTime Over DateTimeOffset [英] When Would You Prefer DateTime Over DateTimeOffset

问题描述

几个月前，我被介绍到新的 DateTimeOffset 类型，很高兴 DateTime 关于时区的缺陷终于得到了照顾。

A few months ago I was introduced to the new DateTimeOffset type and was glad DateTime's flaws with regard to time zones were finally taken care of.

然而，我不知道是否有任何使用这种新类型可能发生的开销或问题。

However, I was left wondering if there were any overhead or problems that could occur from using this new type.

我在一个多区域的Web应用程序上工作。有谁知道有什么可以摇摆我不要使用它所有的日期/时间工作？在这里有滥用的窗口吗？

I work on a multi-locale web application. Does anyone know of anything that could sway me from just using it for all my date/time work? Is there a window for abuse here?

参考： DateTimeOffset：Justin Van Patten的.NET 3.5中的新DateTime结构

推荐答案

有时你真的只想表示一个本地（时区不知道）的日期和时间，而不是一个 及时。说实话，代表一个时间更经常有用 - 例如唤醒我上午8点，无论时区 - 但日期和时间也可能有用。

Sometimes you really just want to represent a "local" (timezone unaware) date and time rather than an instant in time. To be honest it's more often useful to represent just a time - e.g. "wake me up at 8am, regardless of timezone" - but date and time could be useful too.

我同意，绝大多数情况下， DateTimeOffset 更适合。它确实令我奇怪，没有一个 DateTimeTimeZone 结构，它既有即时和时区，但是...一个偏移实际上并没有给你所有的信息你需要。 （例如，给定一个 DateTimeOffset ，你不知道24小时后的时间是什么，因为你不知道DST可能会在什么时候进入。）

I agree that for the vast majority of cases, DateTimeOffset is a better fit. It does strike me as odd that there isn't a DateTimeTimeZone struct which has both the instant and its timezone though... an offset doesn't actually give you all the information you need. (For instance, given a DateTimeOffset, you don't know what the time will be 24 hours later, because you don't know when DST might kick in.)

如果你想要那种结构，我有一个另一个答案中非常粗略的实现。我确定它可以很容易地改进：）

If you want that kind of structure, I have a very crude implementation in another answer. I'm sure it could be improved very easily :)

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