blocks|key|1420740|text|我认为您需要将这个xml转换为DateTime，然后使用TimeZoneInfo类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1420741|如果丹麦是你的当地时间：|1420742|DateTime+thisTime+=+DateTime.Now;
bool+isDaylight+=+TimeZoneInfo.Local.IsDaylightSavingTime(thisTime);|code-block|syntax|javascript|1420743|否则你需要获取丹麦TimeZone：|1420744|DateTime+thisTime+=+DateTime.Now;
//+get+Denmark+Standard+Time+zone+-+not+sure+about+that
TimeZoneInfo+tst+=+TimeZoneInfo.FindSystemTimeZoneById("Denmark+Standard+Time");
bool+isDaylight+=+tst.IsDaylightSavingTime(thisTime);|1420745|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Think you need convert this xml to DateTime and then use TimeZoneInfo class.

If Denmark your local time:

<pre><code>DateTime thisTime = DateTime.Now;
bool isDaylight = TimeZoneInfo.Local.IsDaylightSavingTime(thisTime);
</code></pre>

Else you need to get Denmark TimeZone:

<pre><code>DateTime thisTime = DateTime.Now;
// get Denmark Standard Time zone - not sure about that
TimeZoneInfo tst = TimeZoneInfo.FindSystemTimeZoneById("Denmark Standard Time");
bool isDaylight = tst.IsDaylightSavingTime(thisTime);
</code></pre>

blocks|key|1420045|text|当我按照上面的方式编写代码时-对于New-York，我在调试器中发现时间设置正确(包括DST)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1420046|TimeZoneInfo+nyTimeZone+=+TimeZoneInfo.FindSystemTimeZoneById("Eastern+Standard+Time");

DateTime+nyTime+=+GetLocalDateTime(DateTime.UtcNow,+nyTimeZone);

if+(nyTimeZone.IsDaylightSavingTime(nyTime))
++++nyTime+=+nyTime.AddHours(1);

public+static+DateTime+GetLocalDateTime(DateTime+utcDateTime,+TimeZoneInfo+timeZone)
++++{

++++++++utcDateTime+=+DateTime.SpecifyKind(utcDateTime,+DateTimeKind.Utc);

++++++++DateTime+time+=+TimeZoneInfo.ConvertTime(utcDateTime,+timeZone);

++++++++return+time;

++++}|code-block|syntax|javascript|1420047|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When I coded as above - for New-York, I found in the debugger that the time was set correctly (including DST)

<pre><code>TimeZoneInfo nyTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

DateTime nyTime = GetLocalDateTime(DateTime.UtcNow, nyTimeZone);

if (nyTimeZone.IsDaylightSavingTime(nyTime))
 nyTime = nyTime.AddHours(1);

public static DateTime GetLocalDateTime(DateTime utcDateTime, TimeZoneInfo timeZone)
 {

 utcDateTime = DateTime.SpecifyKind(utcDateTime, DateTimeKind.Utc);

 DateTime time = TimeZoneInfo.ConvertTime(utcDateTime, timeZone);

 return time;

 }
</code></pre>

blocks|key|1420011|text|您可以使用TimeZoneInfo.IsDaylightSavingTime|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1420012|DateTime+theDate+=+new+DateTime(2012,+5,+1);+//+may+1st
TimeZoneInfo+tzi+=+TimeZoneInfo.FindSystemTimeZoneById("Central+European+Standard+Time");
bool+isCurrentlyDaylightSavings+=+tzi.IsDaylightSavingTime(theDate);|code-block|syntax|javascript|1420013|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/bb460642%2528v=vs.90%2529.aspx^0|5|X|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can use <a href="http://msdn.microsoft.com/en-us/library/bb460642%28v=vs.90%29.aspx" rel="noreferrer">TimeZoneInfo.IsDaylightSavingTime</a>

<pre><code>DateTime theDate = new DateTime(2012, 5, 1); // may 1st
TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById("Central European Standard Time");
bool isCurrentlyDaylightSavings = tzi.IsDaylightSavingTime(theDate);
</code></pre>

blocks|key|2373928|text|这是一个通用的测试，如果我的数学不正确，我很乐意纠正。在我的例子中，我只需要获得时区的GMT偏移量，而不管它在世界的什么地方。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2373929|++int+timezone;

++TimeZoneInfo+localZone+=+TimeZoneInfo.Local;

++DateTime+myTime+=+DateTime.Now;

++bool+isDayLight+=+TimeZoneInfo.Local.IsDaylightSavingTime(myTime);

++if+(isDayLight)
++++++++++++timezone+=+Math.Abs(localZone.BaseUtcOffset.Hours)+%2B+1;
++else
++++++++++++timezone+=+Math.Abs(localZone.BaseUtcOffset.Hours);

++Debug.WriteLine("timezone+is+"+%2B+timezone);|code-block|syntax|javascript|2373930|我只是找到了当前时间，如果是夏令时，就在GMT偏移量上加上%2B1。|2373931|这适用于Visual+Studio+Express+2013。|2373932|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is a generic test and happy to be corrected if my math is incorrect. In my case I just needed to get the GMT offset for the timezone regardless of where it was in the world.

<pre><code> int timezone;

 TimeZoneInfo localZone = TimeZoneInfo.Local;

 DateTime myTime = DateTime.Now;

 bool isDayLight = TimeZoneInfo.Local.IsDaylightSavingTime(myTime);

 if (isDayLight)
 timezone = Math.Abs(localZone.BaseUtcOffset.Hours) + 1;
 else
 timezone = Math.Abs(localZone.BaseUtcOffset.Hours);

 Debug.WriteLine("timezone is " + timezone);
</code></pre>

I simply found the current time and if it was in Day Light Savings period added +1 to the GMT offset.

This works with Visual Studio Express 2013.

blocks|key|735765|text|你需要做两件事：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|735766|call+IsAmbiguous|offset|length|style|CODE|735767|List+item+IsDaylightSavingTime.|unordered-list-item|735768|
的|735769|ordered-list-item|735770|735771|if+(TimeZoneInfo.Local.IsAmbiguousTime(unclearDate)+%7C%7C++++++++++++++TimeZoneInfo.Local.IsDaylightSavingTime(unclearDate))+++++++++++++Console.WriteLine("{0}+may+be+daylight+saving+time+in+{1}.",+unclearDate,+TimeZoneInfo.Local.DisplayName);|735772|https://msdn.microsoft.com/en-us/library/bb460642(v=vs.110).aspx|735773|entityMap|0|LINK|mutability|MUTABLE|url^0|0|5|B|0|A|K|0|0|0|0|0|6O|0|0|1S|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@$D|15|E|16|F|G]]|9|@]|A|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|-4|5|N|7|18|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1A|8|@$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1D|8|@]|9|@$D|1E|E|1F|1|1G]]|A|$]]|$1|T|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|S]]]]

You need to do two things: 

<ol>
<li>call <code>IsAmbiguous</code></li>
<li>List item <code>IsDaylightSavingTime</code>.</li>
</ol>

<code>if (TimeZoneInfo.Local.IsAmbiguousTime(unclearDate) || 
 TimeZoneInfo.Local.IsDaylightSavingTime(unclearDate))
 Console.WriteLine("{0} may be daylight saving time in {1}.", unclearDate, TimeZoneInfo.Local.DisplayName);</code>

<a href="https://msdn.microsoft.com/en-us/library/bb460642(v=vs.110).aspx" rel="nofollow noreferrer">https://msdn.microsoft.com/en-us/library/bb460642(v=vs.110).aspx</a>

blocks|key|2373977|text|这是我的简短解决方案，可以在所有时区使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2373978|DateTime+utcTime+=+DateTime.Parse("30.10.2018+18:21:34")
DateTime+localtime+=+ConvertUTCToLocalTime(utcTime);


public+static+DateTime+ConvertUTCToLocalTime(DateTime+UTCTime)
{
++++var+localZone+=+TimeZone.CurrentTimeZone;
++++var+offset+=+localZone.GetUtcOffset(UTCTime);
++++var+localTime+=+UTCTime.AddHours(offset.Hours);
++++return+localTime;
}|code-block|syntax|javascript|2373979|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

this is my short solution which can be using in all timezones:

<pre><code>DateTime utcTime = DateTime.Parse("30.10.2018 18:21:34")
DateTime localtime = ConvertUTCToLocalTime(utcTime);


public static DateTime ConvertUTCToLocalTime(DateTime UTCTime)
{
 var localZone = TimeZone.CurrentTimeZone;
 var offset = localZone.GetUtcOffset(UTCTime);
 var localTime = UTCTime.AddHours(offset.Hours);
 return localTime;
}
</code></pre>

blocks|key|1420839|text|重要|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1420840|myDateTime.IsDaylightSavingTime确实返回了正确的值...但是..。它至少精确到一天中的某一小时，仅仅传递日期是不够的。|1420841|例如，今年(2019)+3/10/2019+02:00:00作为myDateTime将返回false，但3/10/2019+03:00:00将返回true。|1420842|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Important 

myDateTime.IsDaylightSavingTime DOES return the proper value... but... it is accurate down to at least the hour of the day, just passing the date alone isn't enough.

For instance this year (2019) 3/10/2019 02:00:00 passed as myDateTime will return false, but 3/10/2019 03:00:00 will return true.

blocks|key|2458007|text|基于上面提供的其他代码，我编写了一个完整的代码来运行和进行测试。变量cityTz正在接收IANA时区名称示例。在Mac和Linux中使用IANA时区模式(Windows使用不同的时区样式)。2020年，纽约夏令时(DST)将于11月1日结束。如果你测试下面的代码，返回的结果将是假的，因为"theDate“是11月2日，也就是DST结束后的第二天。但是，如果您更改注释行并将theDate设置为11月1日(纽约的最后DST日期)，则返回的结果将为TRUE。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2458008|您可以在Mac或Linux终端中键入以下命令编译此程序：|2458009|csc+testDST.cs|code-block|syntax|javascript|2458010|要运行程序，请执行以下操作：|2458011|mono+testDST.exe|2458012|完整代码：|2458013|using+System;
using+System.Collections.Generic;
using+System.Linq;

class+Program{
++++static+void+Main(string[]+args)
++++{
++++++++string+cityTz;

++++++++//cityTz+=+"America/Sao_Paulo";
++++++++cityTz+=+"America/New_York";

++++++++//DateTime+theDate+=+new+DateTime(2020,+11,+1);+//returns+TRUE
++++++++DateTime+theDate+=+new+DateTime(2020,+11,+2);+//returns+FALSE

++++++++Console.WriteLine("Data:+"%2BtheDate);

++++++++TimeZoneInfo+tzi+=+TimeZoneInfo.FindSystemTimeZoneById(cityTz);
++++++++bool+isDaylight+=+tzi.IsDaylightSavingTime(theDate);

++++++++Console.WriteLine("isDaylight+this+date+in+"%2B+cityTz+%2B"?:+"%2B+isDaylight);
++++}
}|2458014|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Based on other codes provided above, I made a complete code to run and make tests. The variable cityTz is receiving an IANA timezone name example. IANA timezone pattern is used in Mac and Linux (Windows uses different timezone style). In 2020, daylight-saving (DST) in New York ends on November 01. If you test the code below, the return will be FALSE, because &quot;theDate&quot; is November 02, the next day after the end of DST. But if you change the line commented and set theDate to November 01 (last DST date in NY), the return will be TRUE.
You can compile this program in Mac or Linux terminal typing:
<pre><code>csc testDST.cs
</code></pre>
To run your program:
<pre><code>mono testDST.exe
</code></pre>
Complete code:
<pre><code>using System;
using System.Collections.Generic;
using System.Linq;

class Program{
 static void Main(string[] args)
 {
 string cityTz;

 //cityTz = &quot;America/Sao_Paulo&quot;;
 cityTz = &quot;America/New_York&quot;;

 //DateTime theDate = new DateTime(2020, 11, 1); //returns TRUE
 DateTime theDate = new DateTime(2020, 11, 2); //returns FALSE

 Console.WriteLine(&quot;Data: &quot;+theDate);

 TimeZoneInfo tzi = TimeZoneInfo.FindSystemTimeZoneById(cityTz);
 bool isDaylight = tzi.IsDaylightSavingTime(theDate);

 Console.WriteLine(&quot;isDaylight this date in &quot;+ cityTz +&quot;?: &quot;+ isDaylight);
 }
}
</code></pre>

How to check if in Denmark daylight time savings has taken effect, if so, then add 1 hour to my data, else not?
I have a xml file:

<pre><code>&lt;day = "1"
month = "5"
sunrise ="06:30"
sunset ="21:30"
/&gt;
</code></pre>

Check if daylight savings is in effect?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何检查丹麦的夏令时是否生效，如果生效，则在我的数据中增加1小时，否则不生效？我有一个xml文件：<day = "1"month = "5"sunrise ="06:30"sunset ="21:30"/>

问检查夏令时是否生效？
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问检查夏令时是否生效？
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