The byline of this thread currently reads "2041 days ago", and it's really hard to make sense of that, since dividing by 365 usually takes more than a split-second.
Thus for submissions and comments older than X days, change the byline from "X days ago" to "Month DD, YYYY".
Both 100 and 365 would be okay values for X.
EDIT: Alternatively, extend the current pattern of "minutes ago", "hours ago", "days ago" to "months ago" and "years ago".