在 c# 中的特定时区创建日期时间

问题描述

我正在尝试创建一个单元测试来测试机器上时区何时更改的情况，因为它已被错误地设置然后更正.

I'm trying to create a unit test to test the case for when the timezone changes on a machine because it has been incorrectly set and then corrected.

在测试中，我需要能够在非本地时区创建 DateTime 对象，以确保运行测试的人无论身在何处都可以成功地执行此操作.

In the test I need to be able to create DateTime objects in a none local time zone to ensure that people running the test can do so successfully irrespective of where they are located.

从 DateTime 构造函数中可以看出，我可以将 TimeZone 设置为本地时区、UTC 时区或未指定.

From what I can see from the DateTime constructor I can set the TimeZone to be either the local timezone, the UTC timezone or not specified.

如何创建具有特定时区(如 PST)的 DateTime?

How do I create a DateTime with a specific timezone like PST?

推荐答案

Jon 的回答 谈到 TimeZone，但我建议使用 TimeZoneInfo 代替.

Jon's answer talks about TimeZone, but I'd suggest using TimeZoneInfo instead.

我个人喜欢尽可能保持 UTC 格式(至少在过去是这样；为未来存储 UTC 有潜在的问题)，所以我建议这样的结构:

Personally I like keeping things in UTC where possible (at least for the past; storing UTC for the future has potential issues), so I'd suggest a structure like this:

public struct DateTimeWithZone
{
    private readonly DateTime utcDateTime;
    private readonly TimeZoneInfo timeZone;

    public DateTimeWithZone(DateTime dateTime, TimeZoneInfo timeZone)
    {
        var dateTimeUnspec = DateTime.SpecifyKind(dateTime, DateTimeKind.Unspecified);
        utcDateTime = TimeZoneInfo.ConvertTimeToUtc(dateTimeUnspec, timeZone); 
        this.timeZone = timeZone;
    }

    public DateTime UniversalTime { get { return utcDateTime; } }

    public TimeZoneInfo TimeZone { get { return timeZone; } }

    public DateTime LocalTime
    { 
        get 
        { 
            return TimeZoneInfo.ConvertTime(utcDateTime, timeZone); 
        }
    }        
}

您可能希望将TimeZone"名称更改为TimeZoneInfo"以使事情更清楚 - 我自己更喜欢更简短的名称.

You may wish to change the "TimeZone" names to "TimeZoneInfo" to make things clearer - I prefer the briefer names myself.

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