Hi Dave, found this in a PDF...
On Unix systems the accounting files provide information on user logins. Traditionally,
these have been separated into at least three files: utmp file, which contains information on
currently logged-in users; the wtmp file, which contains entries about past logins; and lastlog,
which contains the name, port, and last login time for each user.
Mac OS X up to version 10.4 also had utmp, wtmp, and lastlog files. These were
deprecated, however, in 10.5 and replaced with /var/run/utmpx for currently logged in users
and asl.db for the functions of wtmp and lastlog
But, it sounds more like your clock has a problem, I'm thinking it's setting the Date/Time correct once booted because it's set to Automatically updae from the Internet in Date & Time Pref Pane.
I'd look at the entry before 12/31/00 to see what Date/Time that the MBP may have lost power or Battery went dead, etc.
Thanks for the help BDAqua. The time and date seem ok after startup if I have "set date and time automatically" disabled.
I don' t have an asl.db file on my MBP. I do have a directory /var/log/asl. I read the /var/log direcory can be safely cleared at http://superuser.com/questions/246163/on-mac-os-x-how-do-i-clear-out-console-app, but I think I'll try to upgrade OS X first. Maybe Apple has fixed some bugs associated with the logging changes they made in 10.5.