It was originally 7-4-7. That was on all the posters, literature, etc. Then, for reasons unknown, they bumped it a day to 7-3-7. But all the posters were already printed, so that is the date you will see.
Actually, some theatres have been authorized to hold an 8pm showing on 7-2-07. So if they are not sold out, you can still see it then.