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根据时区的偏移量和后缀查找夏令时指示

发布于 2024-12-04 03:08:06 字数 218 浏览 1 评论 0原文

我正在使用地球工具网络服务来查找基于经纬度的时区。我在网络服务中获取偏移量和后缀。

Earth Tool Webservice

现在，我面临的问题是我需要从中获取时区偏移量和后缀并确定该地区是否有夏令时。我该怎么做？

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白日梦 2024-12-11 03:08:06

.Net 有一个很好的 TimeZoneInfo.Local.IsDaylightSavingTime，但不幸的是您没有足够的信息来创建实例。

但是，您应该能够执行以下操作：

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;

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

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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