Yeah, birth of the Empire would be the logical in-universe calendar up to RotJ. Then I could see the Empire and its successor states continuing to use the founding of the Empire, while the Alliance and is successor states would use Endor or something shortly after.
For my first SWVII RPG, I used the founding of the Republic. So the game started in 25042.
The new one is going to use the Great Resynchronization calendar for non-affiliated historical documents... I think the Empire will still use the Imperial calendar. Perhaps, "in the Thirty-Fourth year of our Dark Lord"?
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Hi, I'm Kongou! Are you my admiral?[This message has been edited by Moff (edited 06-14-2015 @ 12:00 PM).]