When you enabled logging on FTOS by default it doesn’t timestamp the log entries. Instead it shows that an event occurred this many minutes/hours/days/weeks ago from the time you issued the show logging command.
To timestamp your logging information in FTOS issue the service timestamps log datetime localtime msec command.
F03(conf)#service timestamps log datetime localtime msec
Additional information about service timestamps can be found on page 108 of the FTOS Command Line Interface Reference.