How Did People Count Years Before BC and AD Medium
In which period was the agenda originated?
At what time was the timetable initially established?
At what time did the calendar come into existence?
In what period did the calendar initially invented?
During what period did the timetable firstly thought up?
When was the timetable initially devised?
At what time did the schedule inception?
During what period was the calendar come about for the first time?
