[cabalamat]

You need to count from 0.

1 BC should be renamed year 0. Then the years 0-99 are the 0th century, the years 1900-1999 are the 19th century, etc.

To avoid confusion between new style and old style centuries, create a new word, "centan", meaning "100 years" and use cardinal instead of ordinal numbers, for conciseness. Then the years 1900-1999 are the 19-centan.

[im3w1l]

It's always fun how to debate how to square circles, something has to give, but what? My proposed solution is to make the first "century" 99 years.