At what time was the calendar originated?
When was the calendar initially devised?
In what period was the agenda come into existence?
At what time did the agenda initially devised?
During what period did the schedule originally conceived?
In which period did the schedule initially created?
At what time was the timetable generation?
In what period did the calendar come about for
the first time?
- 04/13/01:39
- Mesoamerican calendars Wikipedia
