[082349872349872]

XIX: nineteenth century; XX: twentieth century; we're in the XXI now (even if we don't seem to be acting much like it)

[nb. this notation is (without red ink?) unsuitable for dates before the Age of Pisces]

[bckr]

Is this some occultism thing?

[082349872349872]

Roman numerals denoting centuries is a historian thing.

I mentioned "Age of Pisces" just because it seriously annoys me that years go from 1 BC to 1 AD with no 0. (inspired by: https://news.ycombinator.com/item?id=38761574 )