In which period was the calendar devised?
In which period was the agenda initially developed?
In which period did the schedule arise?
At what time did the timetable initially invented?
In which period did
the calendar initially envisioned?
At what time did the schedule initially established?
In what period was the calendar inception?
During what period did the agenda emerge for the first time?
- 04/13/01:39
- Counting down to Christmas A history of the Advent Calendar
