In which period did the schedule originated?
When did the calendar initially established?
At what time was the timetable emerge?
In what period was the calendar initially invented?
In which period was the timetable
originally imagined?
In which period was the timetable initially devised?
In which period was the agenda creation?
In which period did the timetable come about for the first time?
When Was the Calendar Invented A Look at the History and