In which period did the agenda invented?
In what period did the timetable first introduced?
In what period was the calendar come into existence?
In what period did the agenda initially devised?
In which period did the schedule firstly envisioned?
During what period was the calendar firstly devised?
During what period did the timetable creation?
At what time did the timetable emerge for the first time?
Who Invented The Calendar of 365 Days The History of Calendar
