code: public static long getDaysBetweenIgnoreTime(Date startDate, Date endDate) {
          startDate = getRoundedDay(startDate);
          endDate = getNextDay(endDate);
          return getBetweenDate(startDate, endDate);
      }
docs: 不考虑时间求天数差
  
  @param startDate 开始时间
  @param endDate   结束时间