Elden Ring is currently slated to launch on Feb. 25, 2022, on Xbox Series X|S, Xbox One, PS5, PS4, and Windows PCs. In terms of when the game will become available to play, the console versions of Elden Ring will go live at midnight in your local region. Note that this means some regions will technically get access to the game before others.
As for the PC version of the game, it's currently unclear when PC players will be able to start playing Elden Ring. It's possible that it will also unlock at midnight in your local region, but this hasn't been confirmed. We expect that Bandai Namco and FromSoftware will share more information about the game's launch time soon, though.