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12.13.2011 , 07:35 PM | #8
the Galactic Standard Calendar was the standard measurement of time in the galaxy. It centered around the Coruscant Solar cycle, which was 368 days long (one day consisting of 24 standard hours).[1] Numerous epochs were used to determine calendar eras. The most recent of these calendar eras used the Battle of Yavin as its epoch, or "year zero". BBY stands for Before the Battle of Yavin, and ABY stands for After the Battle of Yavin.

pretty easy to find...