I apply last Saturday , I received the email about my drug test I passed my das are Monday Tuesday- Thursday and Friday but when do I actually start since I got told only they open September 16 which is Saturday , when do I start ?

You will receive an email that will tell you that you can schedule your first day of work. Until then, you are just waiting for a shift to become available for you.

They are open 7 days 24 hrs...if your 1st day of the is Monday, then you start Monday 18th

I don't know