如何在C＃中将日期时间转换为特定时区？ [英] How to convert a datetime to specific timezone in c#?

问题描述

我需要将 DateTime 转换为特定时区的帮助。我下面的内容无法正常工作。

I need help converting a DateTime to a specific time zone. What I have below is not working correctly.

gmTime = 2013年3月2日1:00:00 AM

 TimeZoneInfo timeZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
 var time = timeZoneInfo.ConvertTime(gmTime, timeZone);

当我调试 time 的值时，应用区域时，应为 03/01/2013 PM：$ ，返回为 03/02/2013 1： 00:00 AM 。

When I debug the value of time, which should be 03/01/2013 8:00:00 PM when the zone is applied, it comes back as 03/02/2013 1:00:00 AM.

如果我执行 time.ToLocalTime（），那么我会得到正确的值。但是，我需要将时间转换为不同的时区。

If I do time.ToLocalTime() then I get the correct value. However, I need to convert time to different time zones.

推荐答案

DateTime对象具有一个种类变量，可帮助TimeZoneInfo知道如何处理它。在TimeZone.ConvertTime的 MSDN文档中，它具有以下内容：

DateTime objects have a "Kind" variable which helps TimeZoneInfo know how to treat it. In the MSDN documentation for TimeZone.ConvertTime it has the following:

DateTimeKind.Local，将本地时间转换为destinationTimeZone中的时间。

DateTimeKind.Local, Converts the local time to the time in destinationTimeZone.

DateTimeKind.Utc，转换坐标

DateTimeKind.Utc, Converts Coordinated Universal Time (UTC) to the time in destinationTimeZone.

DateTimeKind。未指定，假定是本地时间。

DateTimeKind.Unspecified, Assumed to be Local.

例如：

  Console.WriteLine("Local time zone is '{0}'.", TimeZoneInfo.Local.Id);

  var gmTime          = new DateTime(2013, 03, 02, 01, 00, 00, DateTimeKind.Utc);
  var localTime       = new DateTime(2013, 03, 02, 01, 00, 00, DateTimeKind.Local);
  var unspecifiedTime = new DateTime(2013, 03, 02, 01, 00, 00);

  var timeZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

  var gmTimeConverted           = TimeZoneInfo.ConvertTime(gmTime,          timeZone); // 03/02/2013 8:00:00AM
  var localTimeConverted        = TimeZoneInfo.ConvertTime(localTime,       timeZone); // 03/02/2013 
  var unspecifiedTimeConverted  = TimeZoneInfo.ConvertTime(unspecifiedTime, timeZone);

  Console.WriteLine("Converting GMT         to EST: {0}", gmTimeConverted);
  Console.WriteLine("Converting Local       to EST: {0}", localTimeConverted);
  Console.WriteLine("Converting Unspecified to EST: {0}", unspecifiedTimeConverted);

结果：

Local time zone is 'Pacific Standard Time'.
Converting GMT         to EST: 3/1/2013 8:00:00 PM
Converting Local       to EST: 3/2/2013 4:00:00 AM
Converting Unspecified to EST: 3/2/2013 4:00:00 AM

或者如果您的本地时区为东部标准时间，您会得到这些结果

Or if your local timezone is 'Eastern Standard Time' you get these results

Local time zone is 'Eastern Standard Time'.
Converting GMT         to EST: 3/1/2013 8:00:00 PM
Converting Local       to EST: 3/2/2013 1:00:00 AM
Converting Unspecified to EST: 3/2/2013 1:00:00 AM

如果您想要将TimeZoneInfo像Utc一样对待未指定，则应像TimeZoneInfo.ConvertTimeFromUtc一样运行。再次从 MSDN文档

DateTimeKind.Local，引发ArgumentException。

DateTimeKind.Local, Throws an ArgumentException.

DateTimeKind.Unspecified或DateTimeKind.Utc，从协调世界时（UTC）转换。

DateTimeKind.Unspecified or DateTimeKind.Utc, Converts from Coordinated Universal Time (UTC).

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