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.
Zeb to the Rescue is a World of Reading Level 1 young-readers book in the Star Wars Rebels series that was released on August 5, 2014. The story was adapted by Michael Siglain based on the Star Wars Rebels prelude short "Entanglement," written by Henry Gilroy and series executive producer Simon Kinberg.