Only quick way to do it is to be logged out and hit todays posts it will give you todays and the last 24 hours of posting.
or
Try logging out and clearing your cookies and all other data in your browser, then visit the page again (dont log in) you may be at 225 new posts again ( but I think it goes by your last visit via ip registration)
otherwise employ the advanced search function and use the search options.
It will take some tweaking but you could be able to do it eventually.
I would just get a vat of coffee and a bushel of biscuits and start at the first forum
TOONGA