Does Writing MCAT on June 2 vs June 18, 2016 Matter?

Hi,

I plan on applying to Canadian and American medical schools this summer/October. Does it make a difference if I write the MCAT on June 2 vs June 18? Writing it on Saturday (June 18), compared with Thursday (June 2), would be more convenient, and the test center that is 2 blocks away from me is offering on June 18.

I am thinking of giving myself 3 months to study...