FFG, you dropped the ball here and lost a golden opportunity! Of what do I speak? Only one of my biggest pet peeves of the Star Wars publishing world - using BBY and ABY as the pivotal moment from which to define time in the Star Wars galaxy.
Of course, I'm a bit tongue-in-cheek here. I'm not "mad" at FFG nor do I lose sleep, I just thought this would be an interesting topic to write about. Why does the Star Wars publishing world insist on using the Battle of Yavin as its pivotal moment to define the years? It's a frame of reference for us, the audience in real-world Earth in order to place events according to the most famous moment in Star Wars Episode IV, in 1977 when we saw Luke blow up the Death Star. It's not, I repeat, not the most pivotal moment in the Star Wars galaxy.
Think about it, why would the entire galaxy at large define it's units of years by one particular battle? Do we in the western world define our years by the number of years since the Normandy beach landing? BNB and ANB? While it was certainly a pivotal battle, did the Battle of Yavin change anything? Not really - all it did was announce the Alliance to Restore the Republic as a serious threat to the Empire.
No, I believe West End Games and Timothy Zahn had it right. The system of counting years would be reestablished by Emperor Palpatine, the megalomaniac that he is. At the time he would have declared himself Emperor and declared the New Order, he would have "reset" the clock: Imperial year #1.
WEG and Zahn of course, wrote their fiction before the prequels so they had the Battle of Yavin at about year 35 as opposed to year 19, but that's another debate and one I also agree with the ways of old. I believe the Empire to be as powerful as it is would be older than 19 years. The Empire declared, Vader was "born" and Luke was born all in the same pivotal year is kinda silly to me, but I guess that part all depends on your personal preference of canon. Yet I think most can agree that the in-galaxy system of timekeeping would have been reset by Palpatine, and counted up from there. It would not be reset by reference to one battle in a larger civil war.
This is my pet peeve with Star Wars publishing and FFG should stop referring to BBY and ABY, come on, it's not too late - make it make sense!