When was the calendar devised?
In which period did the agenda initially developed?
During what period was the timetable arise?
In what period did the timetable initially created?
During what period did the schedule initially envisioned?
During what period was the calendar firstly created?
During what period did the calendar inception?
During what period was the timetable emerge for the first time?
When was the calendar devised?
In which period did the agenda initially developed?
During what period was the timetable arise?
In what period did the timetable initially created?
During what period did the schedule initially envisioned?
During what period was the calendar firstly created?
During what period did the calendar inception?
During what period was the timetable emerge for the first time?
