blocks|key|2149056|text|如何在预定义的时区中返回NSDate？|type|blockquote|depth|inlineStyleRanges|entityRanges|data|2149057|你不能这么做。|unstyled|2149058|NSDate的实例不携带任何有关时区或日历的信息。它只是简单地指出了宇宙时间中的一个点。|offset|length|style|CODE|2149059|您可以在任何日历中解释这个NSDate对象。Swift的字符串插值(示例代码的最后一行)使用使用UTC的NSDateFormatter+(输出中的"%2B0000“)。|2149060|如果要将NSDate值作为当前用户日历中的字符串，则必须为此显式设置日期格式化程序。|2149061|entityMap^0|0|0|0|6|0|D|6|1G|F|0|4|6|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|S|8|@$G|T|H|U|I|J]]|9|@]|A|$]]|$1|K|3|L|5|D|7|V|8|@$G|W|H|X|I|J]|$G|Y|H|Z|I|J]]|9|@]|A|$]]|$1|M|3|N|5|D|7|10|8|@$G|11|H|12|I|J]]|9|@]|A|$]]|$1|O|3|-4|5|D|7|13|8|@]|9|@]|A|$]]]|P|$]]

<blockquote>
 how can i return a NSDate in a predefined time zone?
</blockquote>

You can't.

An instance of <code>NSDate</code> does not carry any information about timezone or calendar. It just simply identifies one point in universal time.

You can interpret this <code>NSDate</code> object in whatever calendar you want. Swift's string interpolation (the last line of your example code) uses an <code>NSDateFormatter</code> that uses UTC (that's the "+0000" in the output).

If you want the <code>NSDate</code>'s value as a string in the current user's calendar you have to explicitly set up a date formatter for that.

blocks|key|682713|text|日期格式必须分配给日期格式化程序的dateFormat属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|682714|let+date+=+NSDate.date()
let+dateFormatter+=+NSDateFormatter()
dateFormatter.dateFormat+=+"yyyy-MM-dd"
let+str+=+dateFormatter.stringFromDate(date)
println(str)|code-block|syntax|javascript|682715|这将使用设备上的默认时区打印日期。只有当您想要根据不同的时区进行输出时，才会添加例如|682716|斯威夫特3*|682717|dateFormatter.timeZone+=+NSTimeZone(name:+"UTC")|682718|斯威夫特4*|682719|dateFormatter.timeZone+=+TimeZone(abbreviation:+"UTC")|682720|还请参考链接http://www.brianjcoleman.com/tutorial-nsdate-in-swift/|offset|length|682721|entityMap|0|LINK|mutability|MUTABLE|url|http://www.brianjcoleman.com/tutorial-nsdate-in-swift/^0|0|0|0|0|0|0|0|6|1I|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|19|8|@]|9|@$S|1A|T|1B|1|1C]]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

The date format has to be assigned to the dateFormat property of the date formatter instead.

<pre><code>let date = NSDate.date()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let str = dateFormatter.stringFromDate(date)
println(str)
</code></pre>

This prints the date using the default time zone on the device. Only if you want the output according to a different time zone then you would add for example

Swift 3.*

<pre><code>dateFormatter.timeZone = NSTimeZone(name: "UTC")
</code></pre>

Swift 4.*

<pre><code>dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
</code></pre>

also refer link <a href="http://www.brianjcoleman.com/tutorial-nsdate-in-swift/" rel="noreferrer">http://www.brianjcoleman.com/tutorial-nsdate-in-swift/</a>

blocks|key|998466|text|Swift+4.0|type|unstyled|depth|inlineStyleRanges|entityRanges|data|998467|dateFormatter.timeZone+=+TimeZone(abbreviation:+"UTC")|code-block|syntax|javascript|998468|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|$]]

Swift 4.0

<pre><code>dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
</code></pre>

blocks|key|680318|text|数字1指的是1，而不管语言如何。但在英语中，它被拼成一个，在西班牙语中拼写为una，在阿拉伯语中拼写为wahid，等等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|680319|同样地，1970年的123982373秒将在不同的时区或日历格式中反映不同的情况，但仍然超过1970年的123982373秒。|680320|3秒和7秒的区别是4秒。这不需要日历。您不需要一个日历/时区来了解这两个Epoch+times+1585420200和1584729000之间的时间差。|offset|length|680321|日期只是从1970年1月1日(午夜世界协调时/格林尼治标准时间)开始的timeInterval。日期也恰好具有字符串表示形式。|680322|重复Nikolia的回答，Swift的默认字符串插值(2015-08-16+18:30:00+%2B0000)使用了一个使用UTC的DateFormatter+(输出中的"%2B0000“)。|style|CODE|680323|使用时区的日历给我们提供了一个上下文表示，它比试图计算两个巨大数字之间的差异更容易理解。|680324|指的是单个日期(想象1970年以来的单个timeInterval+)，每个日历都会有不同的字符串解释。最重要的是，日历本身将根据时区而变化。|BOLD|680325|我强烈建议您使用这个时代换流场，看看选择不同的时区将如何导致同一时刻/日期/时间timeInterval的字符串表示发生变化|680326|我还建议您看看这个答案。主要是本部分：|680327|时区只是对时间戳字符串的修改，它不受日期格式化程序的考虑。
要考虑时区，必须设置格式化程序的timeZone
dateFormatter.timeZone+=+TimeZone(secondsFromGMT:+-14400)|blockquote|680328|entityMap|0|LINK|mutability|MUTABLE|url|https://www.epochconverter.com/|1|2|https://stackoverflow.com/a/46160425/5175709^0|0|0|10|B|0|0|0|R|P|0|0|0|1U|0|A|5|1|0|7|4|2|0|1J|1L|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@$F|1D|G|1E|1|1F]]|A|$]]|$1|H|3|I|5|6|7|1G|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1H|8|@$F|1I|G|1J|L|M]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1K|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1L|8|@$F|1M|G|1N|L|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1O|8|@]|9|@$F|1P|G|1Q|1|1R]]|A|$]]|$1|U|3|V|5|6|7|1S|8|@]|9|@$F|1T|G|1U|1|1V]]|A|$]]|$1|W|3|X|5|Y|7|1W|8|@$F|1X|G|1Y|L|M]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|16]]|17|$5|12|13|14|A|$15|16]]|18|$5|12|13|14|A|$15|19]]]]

The number 1 means 1 regardless of language. Yet in English it's spelled as one, in Spanish it's una, in Arabic it wahid, etc.
Similarly 123982373 seconds pass 1970 is going to reflect differently in different timezones or calendar formats, but's all still 123982373 seconds passed 1970
<hr />
The difference between 3 seconds and 7 seconds is 4 seconds. That doesn't require a calendar. Neither you need a calendar/timezone to know the difference in time between these two <a href="https://www.epochconverter.com/" rel="nofollow noreferrer">Epoch times</a> 1585420200 and 1584729000
Dates are just a timeInterval from January 1, 1970 (midnight UTC/GMT). Dates also happen to have a string representation.
Repeating Nikolia's answer, Swift's default string interpolation (<code>2015-08-16 18:30:00 +0000</code>) uses a DateFormatter that uses UTC (that's the &quot;+0000&quot; in the output).
Calendars with the use of timezones give us a contextual representation that is just easier to understand than trying to calculate the difference between two gigantic numbers.
Meaning a single date (think of a single timeInterval since 1970) will have a different string interpretations per calendar. On top of that a calendar will itself vary based on time zones
I highly recommend that you go and play around with this <a href="https://www.epochconverter.com/" rel="nofollow noreferrer">Epoch converter site</a> and see how selecting a different timezone will cause the string representations for the same moment/date/timeInterval to change
<hr />
I also recommend to see <a href="https://stackoverflow.com/a/46160425/5175709">this answer</a>. Mainly this part:
<blockquote>
Timezone is just an amendment to the timestamp string, it's not considered by the date formatter.
To consider the time zone you have to set the timeZone of the formatter
<code>dateFormatter.timeZone = TimeZone(secondsFromGMT: -14400)</code>
</blockquote>

blocks|key|682748|text|如果输入字符串始终具有相同的时区，则可以创建两个日期格式化程序以输出本地时区(或指定的时区)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|682749|let+timeFormatterGet+=+DateFormatter()
timeFormatterGet.dateFormat+=+"h:mm+a"
timeFormatterGet.timeZone+=+TimeZone(abbreviation:+"PST")

let+timeFormatterPrint+=+DateFormatter()
timeFormatterPrint.dateFormat+=+"h:mm+a"
//+timeFormatterPrint.timeZone+=+TimeZone(abbreviation:+"EST")+//+if+you+want+to+specify+timezone+for+output,+otherwise+leave+this+line+blank+and+it+will+default+to+devices+timezone

if+let+date+=+timeFormatterGet.date(from:+"3:30+PM")+{
++++print(timeFormatterPrint.string(from:+date)).+//+"6:30+PM"+if+device+in+EST
}+else+{
+++print("There+was+an+error+decoding+the+string")
}|code-block|syntax|javascript|682750|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|$]]

If you always have the same time zone for the input string, you can create two date formatters to output the local time zone (or a specified one):
<pre><code>let timeFormatterGet = DateFormatter()
timeFormatterGet.dateFormat = &quot;h:mm a&quot;
timeFormatterGet.timeZone = TimeZone(abbreviation: &quot;PST&quot;)

let timeFormatterPrint = DateFormatter()
timeFormatterPrint.dateFormat = &quot;h:mm a&quot;
// timeFormatterPrint.timeZone = TimeZone(abbreviation: &quot;EST&quot;) // if you want to specify timezone for output, otherwise leave this line blank and it will default to devices timezone

if let date = timeFormatterGet.date(from: &quot;3:30 PM&quot;) {
 print(timeFormatterPrint.string(from: date)). // &quot;6:30 PM&quot; if device in EST
} else {
 print(&quot;There was an error decoding the string&quot;)
}
</code></pre>

how can i return a NSDate in a predefined time zone from a string

<pre><code>let responseString = "2015-8-17 GMT+05:30"
var dFormatter = NSDateFormatter()
dFormatter.dateFormat = "yyyy-M-dd ZZZZ"
var serverTime = dFormatter.dateFromString(responseString)
println("NSDate : \(serverTime!)")
</code></pre>

the above code returns the time as

<pre><code>2015-08-16 18:30:00 +0000
</code></pre>

NSDate set timezone in swift

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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如何从字符串返回预定义时区中的NSDatelet responseString = "2015-8-17 GMT+05:30"var dFormatter = NSDateFormatter()dFormatter.dateFormat = "yyyy-M-dd ZZZZ"var serverTime = dFormatter.dateFromString(responseString)print

问NSDate快速设置时区
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