I'm writing a fanfic where a certain character is sent to the past into someone's body. He wakes up and is disoriented and unsure of where he is. He winds up asking his master the star date. Now this story takes place before the Clone Wars so he doesn't date BBY/ABY. How did they date the timeline before then? I have seen some conflicting sources on Wookiepedia and as a result I'm not entirely sure. Any experts on this area?