I'm not sure if they really have a deadline, but I can tell you what happened with my app. I got my application in around September or October of last year (I think), but they didn't really look at it until January, when they got my fall transcript. They called in late Feb for an interview, but didn't have an opening until early April. My interview was April 8th, and I got my acceptance at the end of May. I'm guessing they have rolling admissions, though, because I'm pretty sure some others got their acceptance a lot earlier? I guess it's hard to tell, though, since they have 3 times per year that you can start.
Anyway, hope that helps! I'd be happy to answer any more questions, just let me know. 😀