> Continuing the pedantalization escalation the 21st century started 2001-01-01 if you follow the Gregorian calendar "named after Pope Gregory XIII, who introduced it in October 1582"
In the same spirit of pedantry:
Well, no, Gregory is beside the point; if you are referring to Anno Domini dates, the 21st Century (and Second Millennium) began on the first day of the year A.D. 2001, whether or not you prefer the Gregorian Calendar.
Preference for the Gregorian Calendar or not will affect when you believe A.D. 2001 started, though.
In the same spirit of pedantry:
Well, no, Gregory is beside the point; if you are referring to Anno Domini dates, the 21st Century (and Second Millennium) began on the first day of the year A.D. 2001, whether or not you prefer the Gregorian Calendar.
Preference for the Gregorian Calendar or not will affect when you believe A.D. 2001 started, though.