Well, it hasn't ended here in Chicago, where it's 4am on December 31st. And it won't end for ships at sea in Time Zone Yankee, 12 hours behind UTC, until 6am tomorrow Chicago time.
But on Kiritimati, it's now just past midnight on January 1st, meaning the tiny atoll in the South Pacific has become the first place on Earth to enter 2021.
Only 20 hours to go for us...and 26 hours to go until the whole planet puts 2020 safely behind us.