In this model, the n-th century starts with the year that ends with "01", and ends with the year that ends with "00"; for example, the 20th century comprises the years 1901 to 2000 in strict usage.
This definition of a century specifies that it begins with a year ending in "01" and ends with a year ending in "00". For example, the 20th century spans from 1901 to 2000 according to this model.