In what period was the calendar invented?
In what period did the schedule initially devised?
In which period did the timetable emerge?
When was the agenda initially invented?
During what period was the agenda initially conceived?
In what period was the agenda firstly created?
In which period was the calendar creation?
In what period was the schedule come about for the first time?
Common Era Wikipedia
- 04/13/01:39
- 365day calendar Wikipedia
