将UTC日期时间转换为DateTimeOffset

问题描述

我需要将 UTC 日期字符串转换为 DateTimeOffsets 。

I need to convert UTC date strings to DateTimeOffsets.

此时间段必须与计算机时区不同。
例如当前计算机时区为+02：00，但我想创建一个偏移量为-4：00的DateTimeOffset。

This must work with a timezone which differs from the computers timezone.E.g. current computer timezone is +02:00, but I want to create a DateTimeOffset with offset -4:00.

我已经在stackoverflow上阅读了很多问题，但没有他们中的人解决了我的问题。

I already read lot of questions here on stackoverflow, but none of them solved my problem.

这就是我需要做的：

输入： 2012-11-20T00：00：00Z

Input: "2012-11-20T00:00:00Z"

输出： DateTimeOffset，其中：

Output: DateTimeOffset with:

• UtcDateTime of 2012-11-20 00:00


• 已定义时区的正确Utc偏移量（在此示例中为01:00）


• LocalDateTime： 2012-11-20 01:00 （= UtcDateTime +偏移量）

• UtcDateTime of 2012-11-20 00:00
• the correct Utc offset for the defined timezone (01:00 in this example)
• LocalDateTime: 2012-11-20 01:00 (= UtcDateTime + Offset)

当然必须考虑夏令时。

编辑：
为了使情况更加清楚，请尝试完成以下代码段：

edit:To make things even clearer, please try to complete the following code snippet:

DateTimeOffset result;
const string dateString = "2012-11-20T00:00:00Z";
var timezone = TimeZoneInfo.FindSystemTimeZoneById("W. Europe Standard Time"); //this timezone has an offset of +01:00:00 on this date

//do conversion here

Assert.AreEqual(result.Offset, new TimeSpan(1, 0, 0));  //the correct utc offset, in this case +01:00:00
Assert.AreEqual(result.UtcDateTime, new DateTime(2012, 11, 20, 0, 0, 0)); //equals the original date
Assert.AreEqual(result.LocalDateTime, new DateTime(2012, 11, 20, 1, 0, 0));

推荐答案

这是您要寻找的解决方案：

Here is the solution you are looking for:

const string dateString = "2012-11-20T00:00:00Z";
var timezone = TimeZoneInfo.FindSystemTimeZoneById("W. Europe Standard Time"); //this timezone has an offset of +01:00:00 on this date

var utc = DateTimeOffset.Parse(dateString);
var result = TimeZoneInfo.ConvertTime(utc, timezone);

Assert.AreEqual(result.Offset, new TimeSpan(1, 0, 0));  //the correct utc offset, in this case +01:00:00
Assert.AreEqual(result.UtcDateTime, new DateTime(2012, 11, 20, 0, 0, 0)); //equals the original date
Assert.AreEqual(result.DateTime, new DateTime(2012, 11, 20, 1, 0, 0));

请注意，您错误地测试了 .LocalDateTime 属性-始终会将结果转换为计算机的本地时区。您只需要 .DateTime 属性即可。

Note that you were incorrectly testing the .LocalDateTime property - which is always going to convert the result to the local timezone of the computer. You simply need the .DateTime property instead.

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