I was getting some weird results in the page history for a page in my trac instance where the pages were changed 42 years in the past. I was trying to track this down and ended up digging around in the database and noticed this:
select name,version,time,comment from wiki where name='History';
History|18|1316981182|Replaced "History/PastDistantTimeline/CivilWarArtifact" with "History/PastDistantTimeline/CivilWarArtifactWhereabouts".
History|19|1316981203|Replaced "History/PresentTimeline/Calendar" with "History/Present/Calendar".
History|20|1316981223|Replaced "History/PresentTimeline/Pacing" with "History/Present/Pacing".
Notice how the time field is 6 digits too short? I prepared a patch that I haven't had a chance to test yet... but I think this should do it.