. I'm taking college classes before my leave date. When is it too late to submit to the military?

I am waiting for my leave date basic training next year. I am wondering if there is a point in time in which I can no longer submit or transfer college credits to the United States Air force? Also does it matter if the classes are online?|||From my understanding, when I dep'd in with the USMC it was up to the last day when the credits didnt count. And no credits are credits it doesnt matter if they were online or in a building