JAVA报表两日期间月，周，日计算

 //计算天数
 public List day(String dates,String datee) throws ParseException{
  List dayls=new ArrayList();
  // 字符串转换成日期
  SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
  Date startDate = format.parse(dates);
  Calendar startTime = Calendar.getInstance();
  startTime.clear();
  startTime.setTime(startDate);
  int startYear = startTime.get(Calendar.YEAR);
  int startMonth = startTime.get(Calendar.MONTH);
  int startDay = startTime.get(Calendar.DAY_OF_MONTH);
  Date endDate = format.parse(datee);
  Calendar endTime = Calendar.getInstance();
  endTime.clear();
  endTime.setTime(endDate);
  int endYear = endTime.get(Calendar.YEAR);
  int endMonth = endTime.get(Calendar.MONTH);
  int endDay = endTime.get(Calendar.DAY_OF_MONTH);
  int count = 0;
  for (int x = startYear; x <= endYear; x++) {
   // 罗马历法产生年份公元1582年
   int gregorianCutoverYear = 1582;
   // 判断是否是闰年
   boolean isLeapYear = x >= gregorianCutoverYear ? ((x % 4 == 0) && ((x % 100 != 0) || (x % 400 == 0)))
     : (x % 4 == 0);
   // 获取开始月的最大天数；大月是1，3，5，7，8，10，12；小月是4，6，9，11；特殊月是2
   int max = 0;
   if (startMonth == 1) {
    if (isLeapYear) {
     max = 29;
    }
    if (!isLeapYear) {
     max = 28;
    }
   }
   if (startMonth == 3 || startMonth == 5 || startMonth == 8
     || startMonth == 10) {
    max = 30;
   }
   if (startMo