Though maybe adding 10,000 to the year is an idea?
https://en.wikipedia.org/wiki/Holocene_calendar
So it's 12021-02-03 today.
No arguing about CE vs AD.
Other calendars are available. It's not true that the UK is reverting to the Julian, though they were rather late switching to the Gregorian. Chinese and Jews have had more goes at it to synchronise the Solar and Lunar systems. Ancient Romans ran Etruscan 8 day week and almost everyone else's 7 day week in parallel for quite a while.
Ancient Celts (Europe Wide, not present remnants) had 13 months as it sort of fits a little better. Gives 28 day months. The Ancient Babylonians started with that which is why there are actually 13 Zodiac signs, not 12. But they decided that though the year is longer than 360 days, that numbers like 12, 24, 20 and 60 work better than 13. Probably 12s, 20s, 24s, 60s and 360 for a circle are all Babylonian ideas, including Zero. Hence months, days, hours, minutes, seconds. UK Pounds, Shillings and Pence. Dozens and Scores. They also had a reasonable idea of the size of the Earth. The Flat Earth idea was Victorian propaganda aimed at the Church of England. No-one educated before then had ever seriously considered it. Ancient Chinese also had estimates for the size of the Earth. As well as later Greeks.
People objected to Columbus because they thought Japan was too far for the food and water of the ships. Not because they thought he'd sail off the edge. That was a myth invented much later. Likely his real plan all along was to chart the Americas because Vineland was known in Vatican records (Greenland tithe reports), which is Newfoundland.