计算两个日期之间相差的月数

public int getMonths(Date date1, Date date2) {
  int iMonth = 0;
  int flag = 0;
  try {
   Calendar objCalendarDate1 = Calendar.getInstance();
   objCalendarDate1.setTime(date1);

   Calendar objCalendarDate2 = Calendar.getInstance();
   objCalendarDate2.setTime(date2);

   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.DAY_OF_MONTH))
    flag = 1;

   if (objCalendarDate2.get(Calendar.YEAR) > 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) {
   e.printStackTrace();
  }
  return iMonth;
 }