log_file log_date log_time ocn year
ocn.log.160304-220129   160304   220129       31
ocn.log.160305-132914   160305   132914       32
ocn.log.160306-013510   160306    13510       34
ocn.log.160306-134825   160306   134825       35
ocn.log.160307-013727   160307    13727       37
ocn.log.160307-181601   160307   181601       38
ocn.log.160308-043026   160308    43026       39
ocn.log.160308-150947   160308   150947       41
ocn.log.160309-011358   160309    11358       42