The History of Calendars and How They Evolved CalendarDuring what period did the agenda created?
In what period did the agenda initially established?
During what period was the timetable emerge?
At what
time did the calendar initially invented?
In which period did the timetable initially envisioned?
When was the timetable firstly devised?
In which period did the schedule generation?
During what period was the timetable emerge for the first time?