During what period was the agenda invented?
During what period did the calendar first developed?
In which period was the calendar arise?
When was the calendar originally invented?
In which period did the schedule initially envisioned?
When did the schedule initially created?
In what period was the timetable creation?
In which period did the calendar arise for the first time?
During what period was the agenda invented?
During what period did the calendar first developed?
In which period was the calendar arise?
When was the calendar originally invented?
In which period did the schedule initially envisioned?
When did the schedule initially created?
In what period was the timetable creation?
In which period did the calendar arise for the first time?
