date      month  day  year  day_of_year  
20080116  01     16   2008  16           
20080416  04     16   2008  107          
20080515  05     15   2008  136          
20080610  06     10   2008  162          
20080710  07     10   2008  192          
20110616  06     16   2011  167          
20120207  02     07   2012  38           
20120913  09     13   2012  257