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It's just a matter of convention. The Year is part of our date system and works the same as our Day and Month system. There's no 0th day or 0th month.

The first date (AD) is 01/01/0001 = 1st day of the 1st month of the 1st year of the 1st Century.

... and 31/12/0100 is the 31st day of 12th month of the 100th year of the 1st century.

... and 31/12/1900 is the last day of the 18th century

Many people think of the year as similar to their age, but this is incorrect. When you're 20 years old you are in your 21st year.



My 8th gen collection