Thanks. It's kind of weird what's happening because my category pages are showing up with the new content faster than the actual article.
I'm not 'manipulating' the date - I'm just not including it. The issue with 'recycling old articles' is that I am updating articles regularly with new information - to add a new article isn't good for the site because it's 90% repetition. Then, when I update them, I re-post them because what's new is important for readers, followers etc, to see. What do you think?
Thanks