log_file log_date log_time ocn year
ocn.log.160404-153912   160404   153912        0
ocn.log.160405-003505   160405     3505        0
ocn.log.160405-105548   160405   105548        1
ocn.log.160405-185805   160405   185805        1
ocn.log.160406-010837   160406    10837        2
ocn.log.160406-072010   160406    72010        2
ocn.log.160406-154116   160406   154116        3
ocn.log.160406-215637   160406   215637        3
ocn.log.160407-041730   160407    41730        4
ocn.log.160407-105948   160407   105948        4