Is 2000 In The 20th Century?

No, the year 2000 is in the 20th century.

Here’s why:

The 20th century spans from January 1, 1901, to December 31, 2000. The 21st century began on January 1, 2001, and will end on December 31, 2100.

So, even though the year 2000 is often associated with the start of a new millennium, it technically falls within the 20th century because the century itself runs from 1901 to 2000, not 2000 to 2099.