Is 2000 the 20th century or the 21st century

Is 2000 the 20th century or the 21st century

twenty-first century

Is 2000 the 20th century or the 21st century? Is 2001-2100 the 21st century

In my opinion, it is rather vague. In terms of the initial history of the year A.D., 2000 should be counted as the 20th century, because there is only one year A.D. in history, but no year A.D. 0 is the beginning of the first century A.D. however, in the later time, people often count year "0" as the beginning of a century. For example, 1900 is regarded as the beginning of the 20th century

Does 2000 belong to the 20th century or the 21st century?
How did you get it

The 20th century was just controversial