Star Wars FAQ: Recorded Time Before BBY
The Battle of Yavin was used as a benchmark to measure the passage of time in the Star Wars galaxy. For example, the Galactic Empire was founded in 19 BBY (Before the Battle of Yavin), and Jacen Solo was born in 9 ABY (After the Battle of Yavin). But how was time recorded before the Battle of Yavin itself? Well, to answer that question, we need to take a look at the Galactic Standard Calendar.
The GSC, as I’m going to nickname it, was the most widely used calendar across the galaxy. Established at the birth of the Galactic Republic, the GSC was based on two factors; the size of Coruscant, and the planet’s rotation around both its sun and primary satellite, Centax-1. The accepted unit of time was the standard second. There were 60 seconds in 1 minute, 60 minutes in 1 hour, 24 hours in 1 day, 5 days in 1 week (those being Primeday, Centaxday, Taungsday, Zhellday, and Benduday), 7 weeks in 1 month, and 368 days in 1 year. Over time, historians used numerous galaxy-altering events as new benchmarks for recording time, such as the Treaty of Coruscant of 3653 BBY – which resulted in dates ending with either BTC (Before the Treaty of Coruscant) or ATC (After the Treaty of Coruscant). Other noteworthy benchmarks were the Ruusan Reformation of 1000 BBY, the Great ReSynchronization of 35 BBY, the formation of the Galactic Empire in 19 BBY, and the Battle of Endor in 4 ABY (though the Battle of Yavin was always seen as the more important event).
So there we have it, literally before the Battle of Yavin, time was recorded around other galaxy-altering events, such as the Treaty of Coruscant. In addition, we now know that Coruscant is basically Earth, I mean just look at those figures! If you have a question about the Star Wars universe that you want answered in this series, do leave a comment down below.