Why do we call this century as 21st century and not 20th century?

Why do we call this century as 21st century and not 20th century even though its the 2000s?

The reason we call this century the 21st century and not the 20th century, even though it’s the 2000s, is because of how we count centuries.
Centuries are counted based on the year they start with, rather than the decade they end with. The 21st century started on January 1, 2001, and will end on December 31, 2100.

To understand this, let’s break it down:

1. The 1st century started on January 1, 1 AD, and ended on December 31, 100 AD. It covered the years 1-100.
2. The 2nd century started on January 1, 101 AD, and ended on December 31, 200 AD. It covered the years 101-200.
3. Following this pattern, the 20th century started on January 1, 1901, and ended on December 31, 2000. It covered the years 1901-2000.

Since the 21st century starts with the year 2001, it doesn’t fall within the 20th century. It covers the years 2001-2100.
So, even though we are in the 2000s, we refer to it as the 21st century because we count centuries based on the year they start with, not the decade they end with.

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