Hi Sheri! My best guess is that it's as soon as it turns 8/15 Eastern time since that's where
DCL is based out of. I could be wrong, but I would start there. I tried at the 90 day out mark at 9:01 Pacific time, but the site wasn't even working then - So, I didn't get a chance to really check it out.
I'm sure you won't have a problem. Last time I looked, there were still plenty of everything available - Palo, spa, excursions.
Good luck!!!