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.
Imperial stormtroopers are on your trail—and there's only one place for you to hide. Coruscant's underworld is a bizarre maze of danger and fear. But in order to survive, you must find the strange wise man at its center. Your Mission: to travel to the heart of the underworld and escape your pursuers.