根据生日计算距离今天几年几个月几天

Date birthday = xxxxxxxx
Calendar now = Calendar.getInstance();
            Calendar b = Calendar.getInstance();
            b.setTime(birthday);
            int year = now.get(Calendar.YEAR) - b.get(Calendar.YEAR);
            int month = now.get(Calendar.MONTH) - b.get(Calendar.MONTH);
            int day = now.get(Calendar.DAY_OF_MONTH) - b.get(Calendar.DAY_OF_MONTH);
            if (month < 0) {
                month = 12 - b.get(Calendar.MONTH) + now.get(Calendar.MONTH);
                year -= 1;
            }
            if (day < 0) {
                day = b.getMaximum(Calendar.DAY_OF_MONTH) - b.get(Calendar.DAY_OF_MONTH) + now.get(Calendar.DAY_OF_MONTH);
                month -= 1;
            }
            // year + "岁" + month + "个月" + day + "天";