I've been amused by this for a while, although I think when I first saw it I didn't realize that there was so much country-to-country variation in what year the

I've been amused by this for a while, although I think when I first saw it I didn't realize that there was so much country-to-country variation in what year the Gregorian calendar was legally adopted. Maybe a better (or much worse!) behavior would be to show the switch in the current locale, so in ru_RU it happens in 1918, but in es_ES (or es_MX, es_CO, es_AR, es_PY, ...) it happens in 1582.