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 -05:00BaseUtcOffset 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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