"It's been--" Luke paused to consider the numbers. The month system was about the same as it was on the Galactic Calendar give or take but the names were all different. "It's been about three and a half months since I found myself here. It's a strange place in that nothing happens most of the time, and then sometimes a lot is happening all at once. I think you've been told about that already." Luke wasn't looking to bombard Din with repetitious information. It was enough as it was.
"And, well, it was Year 4. The Empire had just fallen." Which was a pretty humble way of Luke describing it, considering his involvement. The trail branched off two ways and Luke took the left train because it would end up going toward the beach where the right would just loop around again.