‘Call Of Duty: Black Ops Cold War’ PC, Xbox One And PS4 Beta: Start/End Times, Codes, File Size And What You Need To Know Last weekend was for the PS4 players only, but this weekend the floodgates open. Here's the full schedule for the 'Call of Duty: Black Ops Cold War open beta on Xbox One, PC and PS4, with start.end times, file size, modes and more.