Get your credit cards ready, because Amazon Prime Day is about to begin! Prime Day, the online retailer's biggest shopping event of the year falls on Tuesday, July 11, this year, with the deals starting at 12 midnight Pacific Time (3 a.m. Eastern). However, if you're a Prime Member, your subscription gets you the privilege to spend all your money early, starting Monday night at 6 p.m. PT (9 p.m. ET).