如今天是2002-04-17
怎么能分别得到2001-012-01和今天之间相差的天数和月数？

/**
 * 计算两个日期之间的月差
 */
        public static int dispersionMonth2(String strDate1,String strDate2)
         {
          int iMonth=0;
          int flag = 0;
         try
          {
             Calendar objCalendarDate1 = Calendar.getInstance();
             objCalendarDate1.setTime(DateFormat.getDateInstance().parse(strDate1));

             Calendar objCalendarDate2 = Calendar.getInstance();
             objCalendarDate2.setTime(DateFormat.getDateInstance().parse(strDate2));

             if(objCalendarDate2.equals(objCalendarDate1))
               return 0;
             if (objCalendarDate1.after(objCalendarDate2) )
             {
                Calendar temp = objCalendarDate1;
                objCalendarDate1= objCalendarDate2;
                objCalendarDate2 = temp;
             }
             if (objCalendarDate2.get(Calendar.DAY_OF_MONTH)  objCalendarDate1.get(Calendar.YEAR))
               iMonth= ((objCalendarDate2.get(Calendar.YEAR) - objCalendarDate1.get(Calendar.YEAR)) * 12
                          + objCalendarDate2.get(Calendar.MONTH) - flag) - objCalendarDate1.get(Calendar.MONTH);
             else
                iMonth= objCalendarDate2.get(Calendar.MONTH)- objCalendarDate1.get(Calendar.MONTH) - flag ;

           }
           catch(Exception e)
           {
           }
           return iMonth;
         }