Gotcha. I just went back and checked some and they all have years now. Hypothesis: this was a perception bias on my part. The decline of social media has increased my HN engagement so that I'm reading more posts earlier, before they've had the year added.
> Hypothesis: this was a perception bias on my part.
I don't know if it was or not but you definitely get a chocolate star for considering the possibility. You wouldn't (well, I can't) believe how uncommon that is!