When did the calendar originated?
In which period did the agenda first
introduced?
During what period did the calendar emerge?
In which period did the schedule originally created?
During what period was the timetable firstly imagined?
At what time was the agenda firstly introduced?
At what time was the calendar creation?
In what period was the calendar come about for the first time?
- 04/13/01:39
- Maya calendar Wikipedia
