Admin Seperation from Marines on EAS day.?

Is it legal for the Marines or any other branch to Admin Sep you on your EAS day? Because it happend to me from the marines. I got Summary Court Martial in April of 2009 And my EAS was on July 10 of 2009. I made it to check out everywhere and at IPAC they cought it last minute that i was supposed to be out already but the paperwork was incomplete . So ya I got booted out on my EAS date on record. please I want to know if I got a fighting chance because a miss up on there end. I got an OTH discharge and a RE-4 Code cuz I popped on a drug test if that helps. thrying to get my honorable discharge .