Need help with a custom query for Jobs & Experts

In jobs and experts, there is a line "setup_postdata(get_post($pro->id))". I would like this query to only retrieve posts that were posted TODAY...I use the php function "$today = getdate();" to get today's date but i'm not sure how to pass the information to get_post().

Or should I need to use WP_Query. If so, how can I use it with setup_postdata(get_post($pro->id)). Please help!