How to turn hanging out into a date?

I asked this guy I like to hang out with me on the last day of school, and we will probably get pizza. He knows I like him, and we text pretty much all of time (we both initiate conversations, I'm not the only one). I would really like to turn this into a date, but don't know how to do it without coming on too strong. I'm really not sure if he likes me back. In about February he said he liked me as a friend and it could possibly turn into more, but since then we've talked a lot more and he's shown some signs that he might possibly like me as more than a friend, like planning movie and tv show marathon dates, but we haven't gotten a chance to do it.