/**       * 
功能描述：时间相减得到天数       * @param beginDateStr       * @param endDateStr       * @return       * long        * @author Administrator       */      public static long getDaySub(String beginDateStr,String endDateStr)     {         long day=0;         java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd");             java.util.Date beginDate;         java.util.Date endDate;         try         {             beginDate = format.parse(beginDateStr);             endDate= format.parse(endDateStr);                 day=(endDate.getTime()-beginDate.getTime())/(24*60*60*1000);                 //System.out.println("相隔的天数="+day);            } catch (ParseException e)         {             e.printStackTrace();         }            return day;     }