Why Is the Year 2000 Considered Part of the 20th Century, Not the 21st?
Discover why the year 2000 marks the end of the 20th century and why the 21st century begins in 2001, based on how centuries are counted.
Video transcript
2000 is part of the 21st century because centuries are counted starting from year 1, not year 0. The 1st century included years 1-100. Therefore, the 20th century covered 1901-2000, making the year 2000 the last year of the 20th century and the year 2001 the first year of the 21st century.
Questions and answers
Why does the 21st century start in 2001 instead of 2000?
The 21st century starts in 2001 because centuries are counted from year 1, so the first century covers years 1 to 100, making the second millennium start at 2001.
What years does the 20th century include?
The 20th century includes the years from 1901 through 2000.
How are centuries counted in the Gregorian calendar?
Centuries are counted starting from year 1, with each century spanning 100 years, so the first century is years 1-100, the second century 101-200, and so on.
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