For the "14 days ago" one - post timestamps get updated when a post gets re-submitted or boosted by the moderators. It would have actually been there from 44 days ago even if it's now saying it was more recent.
interesting, that actually explains a lot. If HN rewrites the timestamp on resubmission/boost, that's exactly why powera saw "14 days ago" for a post our scraper first picked up Dec 8. We were just grabbing whatever hit the top 50 every 30 min, so we caught the original appearance regardless of what the timestamp says now. Good to know.
JoseOSAF|24 days ago