The New Age

Okay smartass, let me rephrase that then. The landmass we now call the United States of America. You know, the landmass that was named after a European explorer.

 

You had a point?

 

the invention of agriculture and the bombing of heroshima, were both bigger more profound turning points in human history.

there are also calendars in common use in a number of fairly large places both older and newer.

calendars don't replace each other immediately. there is one that started in 1844, that might well replace the current, sometime in the next 100-300 years.

(yes, printing press and steam were also big things too)

 

Both France and Russia experimented with new calendars during revolution, increasing the days of the 'week', the latter to eight, if I remember correctly.