The Long Now foundation (which runs Long Bets) uses them: https://longnow.org/ideas/long-now-years-five-digit-dates-and-10k-compliance-at-home/ https://longnow.

The Long Now foundation (which runs Long Bets) uses them: https://longnow.org/ideas/long-now-years-five-digit-dates-and-10k-compliance-at-home/ https://longnow.org/ideas/long-now-years-five-digit-dates-an...