根据时区的偏移量和后缀查找夏令时指示 [英] finding daylight saving indication based on offset and suffix of time zone

问题描述

我正在使用地球工具网络服务根据经纬度查找时区.我在网络服务中得到了偏移量和后缀.

i am using earth tool webservice to find time zone based on lat long. I am getting offset and suffix in the webservice.

地球工具网络服务

现在我面临的问题是我需要从偏移量和后缀中获取时区，并确定该地区是否存在夏令时.我该怎么做?

Now the problem, i am facing is i need to get time zone from the offset and suffix and determine if there is daylight saving in the area or not. how can i do this?

推荐答案

.Net 有一个很好的 TimeZoneInfo.Local.IsDaylightSavingTime，但不幸的是你没有足够的信息来创建一个实例.

.Net has a nice TimeZoneInfo.Local.IsDaylightSavingTime, but unfortunately you don't have enough info to create an instance.

但是，您应该能够执行以下操作:

You should however be able to do something like this:

var offSet = -7;
var utcDateTimeStr = "2011-09-10 22:15:38";
var localWithDSStr = "10 Sep 2011 15:15:38";

// utc time
DateTime utcDateTime = DateTime.SpecifyKind(
                           DateTime.Parse(utcDateTimeStr), DateTimeKind.Utc);
// time taking into account daylight savings
DateTime localWithDS = DateTime.SpecifyKind(
                           DateTime.Parse(localWithDSStr), DateTimeKind.Local);
// time not taking into account daylight savings
DateTime localWithoutDS = utcDateTime.AddHours(offSet);

// is the time given adjusted for daylight savings
TimeSpan diff = (localWithoutDS - utcDateTime);
bool isDayLightSaving = diff.Hours != offSet;

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