it has to be the 7th of a month. there are some rumors that you can turn your console off and re set the date, but i would just wait for the 7th. your next opportunity is in july. remember, you can get this on any playlist. it doesn't have to be the 7 on 7th playlist. just play on one you never play in. bring your exp up to 7. don't use that playlist anymore until the 7th of july. on the 7th, just go back to that playlist and enter it. you will get the acheivement. keep in mind that if you resign from any playlist, you will lose exp in all of them