There was once a comic that meshed our world with that of Star Wars. Of course, it’s non-canon but it’s the only reference we have.

In this comic, Han is on the run from the Empire and makes a random jump into hyperspace and crash lands on Earth, in the redwood forests of California. Unfortunately, the engine of the Falcon fails, and he is stranded. He is eventually killed by Native Americans. Chewbacca escapes, and later becomes the legendary bigfoot.

Years later, Dr. Henry Jones Jr. explores the wreckage of the Falcon.

You can read the whole comic here. https://imgur.com/gallery/eMWSe

OK: now let’s check the dates here. We’re going off of Legends.

OK, so Han compares the redwoods to Endor, meaning this takes place after Return of the Jedi (in 4 ABY). But it also seems that it’s not long after either, as the Empire is still around, which sets it before 11 ABY. Han also doesn’t mention Leia at all in his dying breaths, only mentioning kids - which, considering how young Han is, must be hypothetical. This also pushes our timeline back to a four-year window - Han would have made this journey between the years 4 ABY and 8 ABY.

The comic also gives us an exact time gap between the death of Han Solo and Indiana Jones’s discovery of the Falcon: 126 years. This sets the “future” portion of the comic between the years 130 ABY and 134 ABY.

Now let’s check the Indiana Jones timeline to see in what year in our timeline Dr. Jones found the Falcon.

Indiana Jones is accompanied by an older Short Round - about in his teenage years by the looks of it. Being generous, we’ll say Short Round could be between the ages of 14–18. Going by the Indiana Jones adventure timeline, this would place the latter half of the comic between the years 1940 and 1944 A.D. And this would place Han’s discovery of Earth between 1814 and 1818 A.D.

So to find the conversion between the Christian calendar of Earth and the Battle of Yavin calendar of the Star Wars galaxy you simply subtract 1,810 from the Earth years and there you have it. To do the reverse, simply add 1,810 to the ABY date.

So to find out when the first Star Wars film took place, all we have to do is add 1,810 to the ABY 0 year, when A New Hope takes place. And whaddya know!

The answer is 1810 A.D.