如何在夏令时使用 TimeZoneInfo 获取本地时间?

问题描述

我正在尝试使用 DateTimeOffset 来传达任何时区的特定时刻.我不知道如何使用 TimeZoneInfo 来处理夏令时.

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 saving 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));

打印出来:

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

我在中央时区，我们目前处于夏令时.我正在尝试阅读第二行:

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

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

BaseUtcOffset 显然不会根据 DST 改变.

BaseUtcOffset apparently doesn't change based on DST.

我怎样才能用正确的偏移值获得正确的时间?

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

推荐答案

您需要从 TimeZoneInfo 中获取 UtcOffset，然后将其传递给 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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