A Brief History of Time and Calendars MacTutor History of During what period did the agenda originated?
During what period did the schedule initially developed?
At what time did the schedule emerge?
In which period was the timetable initially devised?
In which period was the calendar firstly conceived?
During what period did the calendar firstly created?
In what period did the agenda inception?
In what period did the agenda emerge for the first time?
