Classifieds Site in PHP - Add features

I currently have a classifieds site much like craigslist that is written in PHP script. I am looking for someone to add the following features to my site: -When someone is posting an ad, they will have the ability to put in a specific date or date range in their posting. -On the main page, a search field is needed that will allow customers to select a date or date range and location to search by. The date will correspond to the date listed in the above added feature.