For those that don't know, my comment is based on the Holocene Era calendar, aka Human era calendar (HE). Basically, human civilization started roughly 12k yea

For those that don't know, my comment is based on the Holocene Era calendar, aka Human era calendar (HE). Basically, human civilization started roughly 12k years ago, in ~-10000BCE. The HE calendar lets us express all human-era events using positive numbers, and does so in a way that just tacks a '1' onto the popular Gregorian calendar so it's very easy to convert.