The Centuries are calculated from-
901 AD, 701 AD,1601 AD.
That means when a new century begins, suppose 17th century, then the 17th century shall be calculated from 1601 AD, as no year exists as 0 AD.
Adios!
The Centuries Are Calculated From.
This site is as about the inspiration I get, as I am designed to get, where faith and conviction are my two flowers, which receive light when asked to God.
Before You Travel. 
Which explains and validates the title of Arthur C. Clarke’s Sci-Fi masterpiece, 2001 – A Space Odyssey. 😉
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