system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Do people in universe use the ABY/BBY system to count years?

For those who don't know, the way the fandom tracks years is ABY/BBY (after/before battle of Yavin - basically before/after episode 4). Is this used in universe?  

If not, what year is it to the characters in universe?  Actually, to a space faring civilization, what planet do they use to track years?  I guess Coruscant maybe?  

If the ABY/BBY system is used in universe, what did people in the prequel era use to track years?
gpt
While it was used by some, there are literally thousands of other calendar metrics used.

The foundation of the Republic is a common one. Years since a certain planet joined the Republic or was colonized is another. The Empire used a dating system based upon its formation.

We don't know what year the prequel era Republic used in canon, but in Legends they set a new calendar system just three years before the Naboo Crisis, before that they used the Ruusan Reformation as their basis.