vBulletin makes it really hard to do that, by making its search code as convoluted and bizarre as possible. I think part of the problem, part of why it's so hard, is that determining your actual last visit time requires two entirely different subsystems, one based on sessions and one on cookies.
I even tried faking out the search routine by telling it that my own last visit time stamp was yesterday. It returned the thread list as if I'd only been here as of yesterday, but the display showed as if none of the posts were new and didn't have the pointers to new posts. This is probably because the forum display parts picked up my cookies...
So it's not a five-minute hack, and not even an hour hack, and so the idea has to be tabled.
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