Looks like there's a bug displaying "ago" dates in the new BBS thread list, showing negative numbers of seconds:

(Might only be for recent posts.)

Yup. And for me the post I wrote just now is marked 12 hours ago :X

Probably just a local/universal time mismatch.

now i'm seeing "NaN years ago" on all posts

All my times show up as posted 6 hours ago regardless of when I posted or how much time is passed :)

I also see "NaN years ago" on mobile browser (Chrome iOS), but dates look ok on desktop browsers (Chrome on Mac)