It seems like it’d get increasingly impractical as the years go on to hundreds of thousands and millions of years to write them out that way, but then…I guess technically one may already do this with the preceding years, so future’s fair game for it?
It’s a signed integer, meaning it has the same amount of space for negative numbers as it does for positive ones. Late 1901 is the same amount of time away from Jan 1st 1970 as early 2038 is