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-5月15日星期二16:24:14 IST 2012
GMT时间-5月15日星期二10:54:14 IST 2012
