I post on Saturdays, but I write on and off during the week. Each post keeps the date on which it was started. Today's - titled "Oh, Darwin!" - is dated the 19th because that's when I pressed the 'new post' button and moved a text box and yada yada whatever. But I wrote a short piece on the 20th and posted it straight away. So that remains the most recent because today's is dated the 19th and counts as earlier and therefore appears beneath it - stop me if I'm boring you.
Turns out it was Groucho Marx who said: "A child of five would understand this. Send someone to fetch a child of five." It's so simple, this. Almost too simple. Maybe send someone to fetch an AI.