How Did People Count Years Before BC and AD Medium
During what period was the agenda devised? During what period was the timetable initially devised? At what time did the timetable emerge? During what period was the timetable firstly devised? During what period was the schedule originally envisioned? In what period was the calendar initially introduced? In which period did the agenda creation? In which period did the schedule come about for the first time?

| when was the calendar invented

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