BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
Meet Rey, Finn, Poe and the rest of heroes of the Resistance who are fighting to save the save the galaxy from the evil First Order.