During what period was the schedule originated?
At what time was the agenda initially devised?
In
what period did the timetable come into existence?
At what time did the calendar originally created?
In which period did the calendar initially thought up?
During what period was the schedule firstly established?
In what period was the schedule inception?
At what time did the calendar arise for the first time?
How Did People Count Years Before BC and AD Medium
