alt Hacker NewsI've noticed how you regularly use five digit zero prefixed Y10K-compliant Long Now Years, but if things go well, you're going to need a lot more digits than that! ;)
https://longnow.org/ideas/long-now-years-five-digit-dates-an...
Zager & Evans - In the Year 2525
https://www.youtube.com/watch?v=zKQfxi8V5FA
Now it's been ten thousand years, man has cried a billion tears
For what, he never knew, now man's reign is through
But through eternal night, the twinkling of starlight
So very far away, maybe it's only yesterday
Our dominant culture's "year zero" (aka the Common Era) is based on an estimated date of birth of a messiah of the currently-dominating religion. That calendar has also seen a major revision in October 1582.
Long before and after that religion became dominant, many people have used different calendar systems - and many still do. Rome was founded in 753 BCE, and the Western Roman Empire fell around 476 CE. That's over 1200 years.
It's more likely that another "year zero" event will happen in less than 8000 years. If the history survives that, we will probably just call the current era "Gregorian" or so.