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如何约会一年中的哪一周？我尝试了以下代码:

  Calendar sDateCalendar = new GregorianCalendar();
  sDateCalendar.set(Integer.parseInt(sDateYearAAAA), Integer.parseInt(sDateMonthMM)-1, Integer.parseInt(sDateDayDD));
  System.out.format("sDateCalendar %tc\n", sDateCalendar);        
  iStartWeek = sDateCalendar.getWeekYear();
  System.out.println("iStartWeek "+iStartWeek+ " "+sDateCalendar.WEEK_OF_YEAR);

我获得:sDateCalendar lun apr 23 11:58:39 CEST 2012 iStartWeek 2012 3

而一年中正确的一周是17.有人可以帮助我吗？