https://www.gamespot.com/articles/overwatch-free-weekend-now-live-on-ps4-xbox-one-an/1100-6453515/

Update: The free weekend for Overwatch has officially begun on all platforms. Coinciding with this, Blizzard has discounted the game, dropping the price of the game to $30. Overwatch: Game of the Year Edition drops to $40, while the Game of the Year upgrade can be had for just $10. The free weekend runs through September 25, but the sale extends beyond that, running until September 28 at 11:59 PM PT. The original story follows.

The Overwatch free weekend is starting soon on Xbox One, PlayStation 4, and PC. If you want to play exactly when it starts, Blizzard has announced the specific start-times for the major regions around the world. The free weekend begins at 11 AM PT on September 22, and you can see how that translates to where you live in the image below.