Slightly off topic: This post says "13 hours ago" but when I do an HN search for it, it says 1 day ago. I also recall reading many of the comments way earlier

Slightly off topic: This post says "13 hours ago" but when I do an HN search for it, it says 1 day ago. I also recall reading many of the comments way earlier than the postrd date/time being shown. Is this an HN bug? Or am I going crazy?