The History of the Advent Calendar from 1902 until now JolablotIn which period was the agenda invented?
In what period was the schedule first introduced?
At what time was the schedule come into existence?
In which period did the agenda firstly created?
During what period did the agenda originally imagined?
When did the agenda initially introduced?
During what period was the timetable inception?
When did the calendar come about for the first time?