What century is 1921?

In the common calendar centuries are calculated from the year 1. There was NO year zero ion the common calendar, which confuses a lot of people.

That means the first century lasted from 1 to 100, the second from 101 to 200, and so on. Following that pattern the century number can be calculated as follows:

1. Determine the starting year of the century. Regardless of a lot of misinformation out there, centuries ALWAYS start with the "1" year, so 1921 is in the century starting with 1901.

2. Remove the last 2 digits ('01') : 1901 -> 19

3. Add 1 to the remaining digit(s) to get the century : 19 + 1 = 20

So, 1921 was in the 20th century.

What this means is that the LAST year of a century always ends in '00' and its first 2 digits are different from the rest of the years. That causes all sorts of problems. In fact, there was almost a universal mistake in 2000 because so many people insisted that 2000 was the first year of the 21st century.

Scientists and calendar experts kept telling the world that 2000 was actually the LAST year of the TWENTIETH century but hardly anyone listened. Some historians checked old books and newspapers, and found that in 1900, for example, almost everyone knew that the 20th century had to wait until 1901. But then, there weren't radio and TV stations constantly giving out wrong information!