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CrazyGamer2017 said:
SvennoJ said:

Centuries start at the year 1, not zero. There is no year zero in our calendar, it's either 1 BC, or 1 AD, year missing in between.

There's no year 0 because back in those days nobody counted the years and centuries as we do now, it's only much later that it was decided that years and centuries would be counted the way they are so it's much later that it was decided there was a year 1 BC and 1 AD...

You are both right and wrong in the sense that the first established year (established much later as I said) is indeed the year 1 but that is mathematically speaking a mistake as any counting should start from 0.

Adding to that the fact that our calendar is known to be highly inaccurate (Jesus was not actually born in 0 or even 1, it is thought he was either born in 3 or 7 and he was certainly not born on December 25 or even January 1)

So I choose to consider the counting of years for mathematical reasons and the number 1900 is part of the 100 numbers that go from 1900 to 1999 and in that regard 1900 is part of the 20th section made of 100 units when starting to count from 0, and not the 19th section.

Which is why the 21st century began on Jan 1, 2000 and not 2001.

In that case you should be consistent and call this century the 20th century as all the numbers start with 20.
Except the zeroth century doesn't sound all that great, though mathematically correct :p

What's year 1 of your life? From birth until you turn 1? Or from 1 until you turn 2?

We're in the 18th year of the 21st century, because the century started at 2001. Mathematically we currently are in the 19th year. The 100th year of the 20th century was the year 2000.

What's the zeroth letter of the alphabet :)