I have a t-shirt with a jack o lantern with a Xmas hat with this text:

31 Oct is 25 Dec

"In 1193 (1981.), I submitted my first article [...] and in 1197 (1987.), I became a member"

Seems obviously wrong, or is that yet another dozenal notation, where what looks like the digit three is really a one? Because it should have been real easy to avoid mistakes like that for an entire decade by just remembering that 1190 = 1980 decimal (next time the decades and dozen-years align like that will be in 2040).