blocks|key|1242876|text|使用DateFormat。例如,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1242877|SimpleDateFormat+isoFormat+=+new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
isoFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date+date+=+isoFormat.parse("2010-05-23T09:01:02");|code-block|syntax|javascript|1242878|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|$]]

Use DateFormat. For example,

<pre><code>SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
isoFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date date = isoFormat.parse("2010-05-23T09:01:02");
</code></pre>

blocks|key|1028079|text|请注意，java.util.Date对象本身不包含任何时区信息-您不能在Date对象上设置时区。Date对象唯一包含的是自“纪元”以来的毫秒数--1970年1月1日，世界时00:00:00。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1028080|如ZZ+Coder所示，您在DateFormat对象上设置时区，以告诉它您希望在哪个时区中显示日期和时间。|1028081|entityMap^0|4|E|10|4|1C|4|0|E|A|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|I|$]]

Be aware that <code>java.util.Date</code> objects do not contain any timezone information by themselves - you cannot set the timezone on a <code>Date</code> object. The only thing that a <code>Date</code> object contains is a number of milliseconds since the "epoch" - 1 January 1970, 00:00:00 UTC.

As ZZ Coder shows, you set the timezone on the <code>DateFormat</code> object, to tell it in which timezone you want to display the date and time.

blocks|key|1028128|text|您还可以在JVM级别设置时区|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1028129|Date+date1+=+new+Date();
System.out.println(date1);

TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
//+or+pass+in+a+command+line+arg:+-Duser.timezone="UTC"

Date+date2+=+new+Date();
System.out.println(date2);|code-block|syntax|javascript|1028130|输出：|1028131|Thu+Sep+05+10:11:12+EDT+2013
Thu+Sep+05+14:11:12+UTC+2013|1028132|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You could also set the timezone at the JVM level

<pre><code>Date date1 = new Date();
System.out.println(date1);

TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
// or pass in a command line arg: -Duser.timezone="UTC"

Date date2 = new Date();
System.out.println(date2);
</code></pre>

output:

<pre><code>Thu Sep 05 10:11:12 EDT 2013
Thu Sep 05 14:11:12 UTC 2013
</code></pre>

blocks|key|1028182|text|如果您必须仅使用标准JDK类，则可以使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1028183|/**
+*+Converts+the+given+<code>date</code>+from+the+<code>fromTimeZone</code>+to+the
+*+<code>toTimeZone</code>.++Since+java.util.Date+has+does+not+really+store+time+zome
+*+information,+this+actually+converts+the+date+to+the+date+that+it+would+be+in+the
+*+other+time+zone.
+*+@param+date
+*+@param+fromTimeZone
+*+@param+toTimeZone
+*+@return
+*/
public+static+Date+convertTimeZone(Date+date,+TimeZone+fromTimeZone,+TimeZone+toTimeZone)
{
++++long+fromTimeZoneOffset+=+getTimeZoneUTCAndDSTOffset(date,+fromTimeZone);
++++long+toTimeZoneOffset+=+getTimeZoneUTCAndDSTOffset(date,+toTimeZone);

++++return+new+Date(date.getTime()+%2B+(toTimeZoneOffset+-+fromTimeZoneOffset));
}

/**
+*+Calculates+the+offset+of+the+<code>timeZone</code>+from+UTC,+factoring+in+any
+*+additional+offset+due+to+the+time+zone+being+in+daylight+savings+time+as+of
+*+the+given+<code>date</code>.
+*+@param+date
+*+@param+timeZone
+*+@return
+*/
private+static+long+getTimeZoneUTCAndDSTOffset(Date+date,+TimeZone+timeZone)
{
++++long+timeZoneDSTOffset+=+0;
++++if(timeZone.inDaylightTime(date))
++++{
++++++++timeZoneDSTOffset+=+timeZone.getDSTSavings();
++++}

++++return+timeZone.getRawOffset()+%2B+timeZoneDSTOffset;
}|code-block|syntax|javascript|1028184|功劳归功于这个post。|offset|length|1028185|entityMap|0|LINK|mutability|MUTABLE|url|http://www.coderanch.com/t/417443/java/java/Convert-Date-timezone^0|0|0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you must work with only standard JDK classes you can use this:

<pre><code>/**
 * Converts the given &lt;code&gt;date&lt;/code&gt; from the &lt;code&gt;fromTimeZone&lt;/code&gt; to the
 * &lt;code&gt;toTimeZone&lt;/code&gt;. Since java.util.Date has does not really store time zome
 * information, this actually converts the date to the date that it would be in the
 * other time zone.
 * @param date
 * @param fromTimeZone
 * @param toTimeZone
 * @return
 */
public static Date convertTimeZone(Date date, TimeZone fromTimeZone, TimeZone toTimeZone)
{
 long fromTimeZoneOffset = getTimeZoneUTCAndDSTOffset(date, fromTimeZone);
 long toTimeZoneOffset = getTimeZoneUTCAndDSTOffset(date, toTimeZone);

 return new Date(date.getTime() + (toTimeZoneOffset - fromTimeZoneOffset));
}

/**
 * Calculates the offset of the &lt;code&gt;timeZone&lt;/code&gt; from UTC, factoring in any
 * additional offset due to the time zone being in daylight savings time as of
 * the given &lt;code&gt;date&lt;/code&gt;.
 * @param date
 * @param timeZone
 * @return
 */
private static long getTimeZoneUTCAndDSTOffset(Date date, TimeZone timeZone)
{
 long timeZoneDSTOffset = 0;
 if(timeZone.inDaylightTime(date))
 {
 timeZoneDSTOffset = timeZone.getDSTSavings();
 }

 return timeZone.getRawOffset() + timeZoneDSTOffset;
}
</code></pre>

Credit goes to this <a href="http://www.coderanch.com/t/417443/java/java/Convert-Date-timezone" rel="noreferrer">post</a>.

blocks|key|1243125|text|如果有人需要这样做，如果您需要将XMLGregorianCalendar时区从协调世界时转换为您当前的时区，那么您需要做的就是将时区设置为0，然后调用toGregorianCalendar()+-它将保持相同的时区，但Date知道如何将其转换为您的时区，因此您可以从那里获取数据。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1243126|XMLGregorianCalendar+xmlStartTime+=+DatatypeFactory.newInstance()
++++.newXMLGregorianCalendar(
++++++++((GregorianCalendar)GregorianCalendar.getInstance());
xmlStartTime.setTimezone(0);
GregorianCalendar+startCalendar+=+xmlStartTime.toGregorianCalendar();
Date+startDate+=+startCalendar.getTime();
XMLGregorianCalendar+xmlStartTime+=+DatatypeFactory.newInstance()
++++.newXMLGregorianCalendar(startCalendar);
xmlStartTime.setHour(startDate.getHours());
xmlStartTime.setDay(startDate.getDate());
xmlStartTime.setMinute(startDate.getMinutes());
xmlStartTime.setMonth(startDate.getMonth()%2B1);
xmlStartTime.setTimezone(-startDate.getTimezoneOffset());
xmlStartTime.setSecond(startDate.getSeconds());
xmlStartTime.setYear(startDate.getYear()+%2B+1900);
System.out.println(xmlStartTime.toString());|code-block|syntax|javascript|1243127|结果：|1243128|2015-08-26T12:02:27.183Z
2015-08-26T14:02:27.183%2B02:00|1243129|entityMap^0|G|K|1X|1|23|L|31|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

If anyone ever needs this, if you need to convert an <code>XMLGregorianCalendar</code> timezone to your current timezone from UTC, then all you need to do is set the timezone to <code>0</code>, then call <code>toGregorianCalendar()</code> - it will stay the same timezone, but the <code>Date</code> knows how to convert it to yours, so you can get the data from there. 

<pre><code>XMLGregorianCalendar xmlStartTime = DatatypeFactory.newInstance()
 .newXMLGregorianCalendar(
 ((GregorianCalendar)GregorianCalendar.getInstance());
xmlStartTime.setTimezone(0);
GregorianCalendar startCalendar = xmlStartTime.toGregorianCalendar();
Date startDate = startCalendar.getTime();
XMLGregorianCalendar xmlStartTime = DatatypeFactory.newInstance()
 .newXMLGregorianCalendar(startCalendar);
xmlStartTime.setHour(startDate.getHours());
xmlStartTime.setDay(startDate.getDate());
xmlStartTime.setMinute(startDate.getMinutes());
xmlStartTime.setMonth(startDate.getMonth()+1);
xmlStartTime.setTimezone(-startDate.getTimezoneOffset());
xmlStartTime.setSecond(startDate.getSeconds());
xmlStartTime.setYear(startDate.getYear() + 1900);
System.out.println(xmlStartTime.toString());
</code></pre>

Result:

<pre><code>2015-08-26T12:02:27.183Z
2015-08-26T14:02:27.183+02:00
</code></pre>

blocks|key|1243200|text|将日期转换为字符串，并使用SimpleDateFormat执行此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1243201|++++SimpleDateFormat+readFormat+=+new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
++++readFormat.setTimeZone(TimeZone.getTimeZone("GMT"+%2B+timezoneOffset));
++++String+dateStr+=+readFormat.format(date);
++++SimpleDateFormat+writeFormat+=+new+SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
++++Date+date+=+writeFormat.parse(dateStr);|code-block|syntax|javascript|1243202|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|$]]

Convert the Date to String and do it with SimpleDateFormat.

<pre><code> SimpleDateFormat readFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
 readFormat.setTimeZone(TimeZone.getTimeZone("GMT" + timezoneOffset));
 String dateStr = readFormat.format(date);
 SimpleDateFormat writeFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
 Date date = writeFormat.parse(dateStr);
</code></pre>

blocks|key|1243236|text|这段代码对我正在开发的一个应用程序很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1243237|++++Instant+date+=+null;
++++Date+sdf+=+null;
++++String+formatTemplate+=+"EEE+MMM+dd+yyyy+HH:mm:ss";
++++try+{
++++++++SimpleDateFormat+isoFormat+=+new+SimpleDateFormat("EEE+MMM+dd+yyyy+HH:mm:ss");
++++++++isoFormat.setTimeZone(TimeZone.getTimeZone(ZoneId.of("US/Pacific")));
++++++++sdf+=+isoFormat.parse(timeAtWhichToMakeAvailable);
++++++++date+=+sdf.toInstant();

++++}+catch+(Exception+e)+{
++++++++System.out.println("did+not+parse:+"+%2B+timeAtWhichToMakeAvailable);
++++}

++++LOGGER.info("timeAtWhichToMakeAvailable:+"+%2B+timeAtWhichToMakeAvailable);
++++LOGGER.info("sdf:+"+%2B+sdf);
++++LOGGER.info("parsed+to:+"+%2B+date);|code-block|syntax|javascript|1243238|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 code was helpful in an app I'm working on:

<pre><code> Instant date = null;
 Date sdf = null;
 String formatTemplate = "EEE MMM dd yyyy HH:mm:ss";
 try {
 SimpleDateFormat isoFormat = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss");
 isoFormat.setTimeZone(TimeZone.getTimeZone(ZoneId.of("US/Pacific")));
 sdf = isoFormat.parse(timeAtWhichToMakeAvailable);
 date = sdf.toInstant();

 } catch (Exception e) {
 System.out.println("did not parse: " + timeAtWhichToMakeAvailable);
 }

 LOGGER.info("timeAtWhichToMakeAvailable: " + timeAtWhichToMakeAvailable);
 LOGGER.info("sdf: " + sdf);
 LOGGER.info("parsed to: " + date);
</code></pre>

blocks|key|1028434|text|在这里，您可以获取类似于"2020-03-11T20:16:17“的日期，并返回"11/Mar/2020+-+20:16”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1028435|+private+String+transformLocalDateTimeBrazillianUTC(String+dateJson)+throws++ParseException+{
++++String+localDateTimeFormat+=+"yyyy-MM-dd'T'HH:mm:ss";
++++SimpleDateFormat+formatInput+=+new+SimpleDateFormat(localDateTimeFormat);

++++//Here+is+will+set+the+time+zone
++++formatInput.setTimeZone(TimeZone.getTimeZone("UTC-03"));

++++String+brazilianFormat+=+"dd/MMM/yyyy+-+HH:mm";
++++SimpleDateFormat+formatOutput+=+new+SimpleDateFormat(brazilianFormat);
++++Date+date+=+formatInput.parse(dateJson);
++++return+formatOutput.format(date);
}|code-block|syntax|javascript|1028436|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|$]]

Here you be able to get date like &quot;2020-03-11T20:16:17&quot; and return &quot;11/Mar/2020 - 20:16&quot;
<pre><code> private String transformLocalDateTimeBrazillianUTC(String dateJson) throws ParseException {
 String localDateTimeFormat = &quot;yyyy-MM-dd'T'HH:mm:ss&quot;;
 SimpleDateFormat formatInput = new SimpleDateFormat(localDateTimeFormat);

 //Here is will set the time zone
 formatInput.setTimeZone(TimeZone.getTimeZone(&quot;UTC-03&quot;));

 String brazilianFormat = &quot;dd/MMM/yyyy - HH:mm&quot;;
 SimpleDateFormat formatOutput = new SimpleDateFormat(brazilianFormat);
 Date date = formatInput.parse(dateJson);
 return formatOutput.format(date);
}
</code></pre>

blocks|key|1028479|text|这个答案可能是最短的，并且它只使用Date类：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1028480|long+current+=+new+Date().getTime()+%2B+3_600_000;++++++++++++++//e.g.+your+JVM+time+zone+%2B1+hour+(3600000+milliseconds)
System.out.printf("%251$td.%251$tm.%251$tY+%251$tH:%251$tM\n",+current);//european+time+format|code-block|syntax|javascript|1028481|但是，如果可以的话，使用更现代的方法来做同样的事情。|1028482|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This answer is probably the shortest and it uses only the Date class:
<pre><code>long current = new Date().getTime() + 3_600_000; //e.g. your JVM time zone +1 hour (3600000 milliseconds)
System.out.printf(&quot;%1$td.%1$tm.%1$tY %1$tH:%1$tM\n&quot;, current);//european time format
</code></pre>
But, if you can, use more modern ways to doing the same.

I have parsed a <code>java.util.Date</code> from a <code>String</code> but it is setting the local time zone as the time zone of the <code>date</code> object.

The time zone is not specified in the <code>String</code> from which <code>Date</code> is parsed. I want to set a specific time zone of the <code>date</code> object.

How can I do that?

How to set time zone of a java.util.Date?

我解析了一个来自String的java.util.Date，但它将本地时区设置为date对象的时区。在从中分析Date的String中未指定时区。我想设置date对象的特定时区。我该怎么做呢？

问如何设置java.util.Date的时区？
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