At what time was the timetable devised?
During what period was the agenda first developed?
During what period was the timetable come into existence?
At what time was the agenda initially devised?
During what period did the calendar originally thought up?
In what period did the schedule firstly introduced?
In what period did the timetable inception?
When was the calendar emerge for the first time?
Who Invented the Calendar A History of the Calendar
