Android / Java

并不是真正可靠的方法，最好使用JodaTime

  Calendar thatDay = Calendar.getInstance();  thatDay.set(Calendar.DAY_OF_MONTH,25);  thatDay.set(Calendar.MONTH,7); // 0-11 so 1 less  thatDay.set(Calendar.YEAR, 1985);  Calendar today = Calendar.getInstance();  long diff = today.getTimeInMillis() - thatDay.getTimeInMillis(); //result in millis

这是一个近似值…

long days = diff / (24 * 60 * 60 * 1000);

要从字符串中解析日期，你可以使用

  String strThatDay = "1985/08/25";  SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");  Date d = null;  try {   d = formatter.parse(strThatDay);//catch exception  } catch (ParseException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }   Calendar thatDay = Calendar.getInstance();  thatDay.setTime(d); //rest is the same....

但是，由于你确定日期格式

Integer.parseInt()