如何使用的TimeZoneInfo夏令时期间获取本地时间？ [英] How to use TimeZoneInfo to get local time during Daylight Savings Time?

问题描述

我想要使用的DateTimeOffset及时在任何时区传达一个特定的时刻。我无法弄清楚如何使用的TimeZoneInfo处理夏令时。

I'm trying to use DateTimeOffset to convey a specific moment in time across any time zone. I can't figure out how to use TimeZoneInfo to deal with daylight savings time.

var dt = DateTime.UtcNow;
Console.WriteLine(dt.ToLocalTime());

var tz = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
var utcOffset = new DateTimeOffset(dt, TimeSpan.Zero);
Console.WriteLine(utcOffset.ToOffset(tz.BaseUtcOffset));

这打印出：

6/2/2010 4:37:19 PM
6/2/2010 3:37:19 PM -06:00

我在中央时区，而我们目前在夏令时。
我想获得的第二行改为：

I am in the central time zone, and and we are currently in daylight savings time. I am trying to get the second line to read:

6/2/2010 4:37:19 PM -05:00

BaseUtcOffset显然不改变的基础上DST。

BaseUtcOffset apparently doesn't change based on DST.

怎样才能获得正确的时间用正确的偏移值？

How can I get the the right time with the proper offset value?

感谢。

推荐答案

您需要从的TimeZoneInfo得到UTCOFFSET，然后传递给ToOffset（）方法：

You need to get the UtcOffset from the TimeZoneInfo, then pass that to the ToOffset() method:

var dt = DateTime.UtcNow;
Console.WriteLine(dt.ToLocalTime());

var tz = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");
var utcOffset = new DateTimeOffset(dt, TimeSpan.Zero);
Console.WriteLine(utcOffset.ToOffset(tz.GetUtcOffset(utcOffset)));

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