At what time did the schedule invented?
At what time did the agenda initially introduced?
In what period was the timetable emerge?
At what time did the timetable initially invented?
During what period was the schedule originally imagined?
At what time did the timetable initially devised?
In which period did the agenda generation?
During what period did the calendar emerge for the first time?
The History of the Advent Calendar from 1902 until now Jolablot
