log_file log_date log_time ocn year
ocn.log.150703-120945   150703   120945     1989
ocn.log.150703-222949   150703   222949     2004
ocn.log.150704-085300   150704    85300     2019
ocn.log.150705-004337   150705     4337     2019
ocn.log.150705-110415   150705   110415     2034
ocn.log.150705-213533   150705   213533     2049
ocn.log.150706-075534   150706    75534     2064