15 
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
java.util.Date fromDate = cal.getTime();
System.out.println(fromDate);

上面的代码不会以 GMT 打印日期，而是以本地时区打印。如何从当前日期获取 GMT 等效日期（假设程序可以在日本或 SFO 运行）

4

3 回答 3

22

这个怎么样 -

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;
}

测试结果：
UTC 时间 - 2012 年
5 月 15 日星期二 16:24:14 IST GMT 时间 - 2012 年 5 月 15 日星期二 10:54:14 IST

于 2012-05-15T10:54:25.397 回答
18 
DateFormat gmtFormat = new SimpleDateFormat();
TimeZone gmtTime = TimeZone.getTimeZone("GMT");
gmtFormat.setTimeZone(gmtTime);
System.out.println("Current DateTime in GMT : " + gmtFormat.format(new Date()));

更一般地，您可以通过这种方式转换为任何（有效）时区

看

于 2012-05-15T10:50:16.143 回答
2

像这样SimpleDateFormat dateFormatGmt = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss"); dateFormatGmt.setTimeZone(TimeZone.getTimeZone("GMT"));？

于 2012-05-15T10:55:33.447 回答