If the computer was set to get time from UTC when it was installed, and then...

If the computer was set to get time from UTC when it was installed, and then the computer is no longer connected to the internet, it could be causing you problem. Try to find the Date & Time app in your Administration Menu and turn off UTC and see if that helps. In Fedora the app is called system-config-date, If your running Gnome it should be similar whatever distro your running. It may also help to run it as root from cli.

Click Here!