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That's true in strict usage where there's no year 0 between 1BC and 1AD, but in popular usage years in the 19th century begin with 18 (i.e. from 1800 to 1899),
by DonaldFisk 2y ago
That's true in strict usage where there's no year 0 between 1BC and 1AD, but in popular usage years in the 19th century begin with 18 (i.e. from 1800 to 1899), and in astronomical year numbering 1BC is year 0, so the first century is 1BC to 99AD inclusive, and so on. This is also true in ISO 8601.