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date1:2010-05-20
date2:2010-06-21

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date3:2010-05-20
date4:2010-06-20

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date5:2010-05-20
date6:2010-06-19

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Months_betweenº¯Êý£¬È磺
select Months_between(to_date('2009-12-01','yyyy-mm-dd'), to_date('2008-12-01','yyyy-mm-dd')) from dual;
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1. /**  
  2. * ¼ÆËãÁ½¸öÈÕÆÚÖ®¼äÏà²îµÄÔÂÊý  
  3. * @param date1  
  4. * @param date2  
  5. * @return  
  6. */  
  7. private int getMonths(Date date1, Date date2){  
  8. int iMonth = 0;  
  9. int flag = 0;  
  10. try{  
  11. Calendar objCalendarDate1 = Calendar.getInstance();  
  12. objCalendarDate1.setTime(date1);  
  13.  
  14. Calendar objCalendarDate2 = Calendar.getInstance();  
  15. objCalendarDate2.setTime(date2);  
  16.  
  17. if (objCalendarDate2.equals(objCalendarDate1))  
  18. return 0;  
  19. if (objCalendarDate1.after(objCalendarDate2)){  
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