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http://www.cnblogs.com/ajian/archive/2009/08/25/1421063.html
TO_DATE¸ñʽ(ÒÔʱ¼ä:2007-11-02   13:45:25ΪÀý)
  
        Year:     
        yy two digits Á½Î»Äê                ÏÔʾֵ:07
        yyy three digits ÈýλÄê                ÏÔʾֵ:007
        yyyy four digits ËÄλÄê                ÏÔʾֵ:2007
           
        Month:     
        mm    number     Á½Î»Ô              ÏÔʾֵ:11
        mon    abbreviated ×Ö·û¼¯±íʾ          ÏÔʾֵ:11ÔÂ,ÈôÊÇÓ¢Îİæ,ÏÔʾnov    
        month spelled out ×Ö·û¼¯±íʾ          ÏÔʾֵ:11ÔÂ,ÈôÊÇÓ¢Îİæ,ÏÔʾnovember
         
        Day:     
        dd    number         µ±Ôµڼ¸Ìì        ÏÔʾֵ:02
        ddd    number         µ±ÄêµÚ¼¸Ìì        ÏÔʾֵ:02
        dy    abbrevia


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SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd"); 
Date startdate = sdf.parse(start_date);
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