If you meant to say "BBY," well BBY stands for "Before Battle of Yavin." So if you see a date that says 19 BBY, that means that the certain event took place 19 years before the battle of Yavin (which appeared in "A New Hope") happened. And ABY means "After Battle of Yavin." The film Return of the Jedi's timeframe was 4 ABY, which means it took place 4 years after "A New Hope."
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