If you application is in you are ok taking the DAT in September. I turned my app in on July 9th of last year and took the DAT on September 1st or something like that. I had most of my secondaries completed by then so they were just waiting on my scores. If you do it that way you are at no real disadvantage. I received 7 interview invites. However, by then it was too late for UOP (already filled most interview spots) and Case was already sch their alternate interviews for March. Your interviews may come later but you will get them.
I had interviews as follows (1) October, (1) November, (2) December, (1) January, (2) March.
2 acceptances by Dec 1st