Well, I tried Lingon, and it ran, but didn't update the clock. After a little more investigation in the logs, I figured out why, and it also explains why OS X doesn't resync at login, even with the "set date and time automatically" option checked.

It's because for some reason, my system doesn't have internet access at the point just before login. I confirmed by clicking on the version Number at the login screen. It shows my network isn't connected yet.

So the solution to my problem is trying to understand why I don't have access to the internet at the time of login. If I fix that, then OS X's automatic sync option should work.

I'm on a home network, cable modem, Apple Airport Extreme router (11g version). Everything is set to DHCP. It appears I have an assigned IP.

Other option is to run the /usr/sbin/ntpdate -u command after login using a script or CRON.

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