Who Invented the Calendar A History of the Calendar
At what time was the calendar devised?
At what time was the timetable first introduced?
In which period did the calendar come into existence?
In what period was the timetable originally devised?
In which period did the calendar originally envisioned?
When did the schedule firstly devised?
During what period did the schedule creation?
At what time did the calendar emerge for the first time?
