blocks|key|1763963|text|DateFormat+gmtFormat+=+new+SimpleDateFormat();
TimeZone+gmtTime+=+TimeZone.getTimeZone("GMT");
gmtFormat.setTimeZone(gmtTime);
System.out.println("Current+DateTime+in+GMT+:+"+%2B+gmtFormat.format(new+Date()));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1763964|通常情况下，您可以通过这种方式转换为任何(有效)时区|unstyled|1763965|1763966|请参阅|offset|length|style|BOLD|1763967|1763968|DateFormat|unordered-list-item|CODE|1763969|1763970|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/1.6/docs/api/java/text/DateFormat.html^0|0|0|0|0|3|0|0|0|A|0|A|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|F|7|14|8|@$J|15|K|16|L|M]]|9|@]|A|$]]|$1|N|3|-4|5|F|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|18|8|@$J|19|K|1A|L|R]]|9|@$J|1B|K|1C|1|1D]]|A|$]]|$1|S|3|-4|5|F|7|1E|8|@]|9|@]|A|$]]|$1|T|3|-4|5|F|7|1F|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

<pre><code>DateFormat gmtFormat = new SimpleDateFormat();
TimeZone gmtTime = TimeZone.getTimeZone("GMT");
gmtFormat.setTimeZone(gmtTime);
System.out.println("Current DateTime in GMT : " + gmtFormat.format(new Date()));
</code></pre>

More generally you can convert to any (valid) time zone this way

<hr>

See 

<ul>
<li><a href="http://docs.oracle.com/javase/1.6/docs/api/java/text/DateFormat.html" rel="noreferrer"><code>DateFormat</code></a></li>
</ul>

blocks|key|1763980|text|不如这样吧-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1763981|public+static+void+main(String[]+args)+throws+IOException+{
++++Test+test=new+Test();
++++Date+fromDate+=+Calendar.getInstance().getTime();
++++System.out.println("UTC+Time+-+"%2BfromDate);
++++System.out.println("GMT+Time+-+"%2Btest.cvtToGmt(fromDate));
}
private++Date+cvtToGmt(+Date+date+){
++++TimeZone+tz+=+TimeZone.getDefault();
++++Date+ret+=+new+Date(+date.getTime()+-+tz.getRawOffset()+);

++++//+if+we+are+now+in+DST,+back+off+by+the+delta.++Note+that+we+are+checking+the+GMT+date,+this+is+the+KEY.
++++if+(+tz.inDaylightTime(+ret+)){
++++++++Date+dstDate+=+new+Date(+ret.getTime()+-+tz.getDSTSavings()+);

++++++++//+check+to+make+sure+we+have+not+crossed+back+into+standard+time
++++++++//+this+happens+when+we+are+on+the+cusp+of+DST+(7pm+the+day+before+the+change+for+PDT)
++++++++if+(+tz.inDaylightTime(+dstDate+)){
++++++++++++ret+=+dstDate;
++++++++}
+++++}
+++++return+ret;
}|code-block|syntax|javascript|1763982|测试结果：|offset|length|style|BOLD|1763983|UTC时间-5月15日星期二16:24:14+IST+2012|1763984|GMT时间-5月15日星期二10:54:14+IST+2012|1763985|entityMap^0|0|0|0|4|0|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]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

How about this -

<pre><code>public static void main(String[] args) throws IOException {
 Test test=new Test();
 Date fromDate = Calendar.getInstance().getTime();
 System.out.println("UTC Time - "+fromDate);
 System.out.println("GMT Time - "+test.cvtToGmt(fromDate));
}
private Date cvtToGmt( Date date ){
 TimeZone tz = TimeZone.getDefault();
 Date ret = new Date( date.getTime() - tz.getRawOffset() );

 // if we are now in DST, back off by the delta. Note that we are checking the GMT date, this is the KEY.
 if ( tz.inDaylightTime( ret )){
 Date dstDate = new Date( ret.getTime() - tz.getDSTSavings() );

 // check to make sure we have not crossed back into standard time
 // this happens when we are on the cusp of DST (7pm the day before the change for PDT)
 if ( tz.inDaylightTime( dstDate )){
 ret = dstDate;
 }
 }
 return ret;
}
</code></pre>

Test Result : 
UTC Time - Tue May 15 16:24:14 IST 2012 
GMT Time - Tue May 15 10:54:14 IST 2012

blocks|key|4649000|text|像这样的SimpleDateFormat+dateFormatGmt+=+new+SimpleDateFormat("yyyy-MMM-dd+HH:mm:ss");+dateFormatGmt.setTimeZone(TimeZone.getTimeZone("GMT"));？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4649001|entityMap^0|4|3Q|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Like this <code>SimpleDateFormat dateFormatGmt = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
dateFormatGmt.setTimeZone(TimeZone.getTimeZone("GMT"));</code> ?

<pre><code>Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
java.util.Date fromDate = cal.getTime();
System.out.println(fromDate);
</code></pre>

The above code doesn't print the date in GMT, but rather prints in the local timezone. How do I get a GMT equivalent date from the current date (assuming that the program can run in Japan or SFO)

How to convert a local date to GMT

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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Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));java.util.Date fromDate = cal.getTime();System.out.println(fromDate);上面的代码不以GMT打印日期，而是以本地时区打印。如...

问如何将本地日期转换为GMT
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问如何将本地日期转换为GMTEN