Android 如何将总天数准确更改为年、月、日？

我正在做一个应用程序，该应用程序与根据给定的生日日期输入获取一个人的年龄有关。为此，我从下面的代码中获取从该日期到当前日期的总天数。

      String strThatDay = "1991/05/10";
      SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
      Date d = null;
      try {

      try {
      d = formatter.parse(strThatDay);
      Log.i(TAG, "" +d);
      } catch (java.text.ParseException e) {

      e.printStackTrace();
      }
      } catch (ParseException e) {

      e.printStackTrace();
      } 
      Calendar thatDay = Calendar.getInstance();
      thatDay.setTime(d); //rest is the same....

      Calendar today = Calendar.getInstance();
      long diff = today.getTimeInMillis() - thatDay.getTimeInMillis(); 
      long days = diff / (24 * 60 * 60 * 1000);

从这段代码中我得到了总天数。所以我的要求是将总天数准确地转换为年、月和日..请帮助....

您应该使用Duration http://docs.oracle.com/javase/1.5.0/docs/api/javax/xml/datatype/Duration.html class :

Duration duration = new Duration();
duration.add( today );
duration.substract( birthDate);
int years = duration.getYears();
int months = duration.getMonths();
int days = duration.getDays();

其他一些替代方案包括使用专用于时间管理的库：Joda time。看计算年龄（年、月、日、小时、分钟和秒） https://stackoverflow.com/questions/4710206/calculate-age-in-years-months-days-hours-minutes-and-seconds?rq=1