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CrazyGamer2017 said:

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.

You can choose whatever you want for whatever reason... but if you make up your own rules and definitions, please don't try to push them in already existing and accepted definitions and distinctions.

The Gregorian calender start at year one and not at year zero, deal with it. Since every century is by definition exactly 100 years (not 99 years or any other number of years), every following century based on the Gregorian calender also has to start at xx01 and not at xx00.

Last edited by Conina - on 22 April 2018