@khurtwilliams I would argue since all calendars and systems for dates are arbitrary and made up by humans anyway, we don't have to keep doing something based on when a calendar (that was created hundreds of years after the date it was supposed to start. No one who lived in what has been delcared year 1 knew it was year 1 at the time), decided to begin. The calendar has been updated and changed numerous times, including times that have caused years to change and months to move around. It's up to us when the decade starts. It can be 2020 if we want it to be. And it can end with 2029 if we want it to. Who cares if there was no year zero. There wasn't really a year 1 either. Personally, I think it makes a lot more sense that way. The 20's should include all the years that with a 2 in the tens place, and shouldn't include years with a 3 in the tens place. 😉