How do we change the calendar so that by 2011, the date of the year used in international commerce (and in majority usage) is not 2011. I'm putting this in the before 1900 since despite the multitudes of Science Fiction writers trying to use the first atomic explosion as year zero, nothing close has come out.
Other than slight differences in the change over from Julian to Gregorian and the slightly more accurate Soviet Calendar (from 1 out of 4 century years w/leap day to 2 out of 9), the only calendars that I believe have seen signficant usage in Europe since 1500 are the French Revolution Calendar which was actually gotten rid of by Napoleon and the various non-Christian Religious Calendars (Jewish (AM), Islamic (AH)).
Do we have to go back far enough to eliminate Christianity as the dominant religion in Europe (loss at the Battle of Tours, etc.) or remove a significant part of European population with Black Plague ("The Years of Rice and Salt")?
Alternately for after 1900, any chance of a 3rd Reich Victory causing an Anno Reich notation?