When did the current decade begin?

The current decade began on January 1, 2021, and will end on December 31, 2030. While some may argue that the decade started in 2020 due to the lack of a year zero, the widely accepted definition aligns with the Gregorian calendar, which counts decades starting from years ending in '1' to those ending in '0'. Thus, 2021 marks the official start of the 2020s decade.