Counting down to Christmas A history of the Advent CalendarIn what period was the timetable devised?
When did the timetable first developed?
During what period did the schedule come into existence?
In which period did the calendar firstly invented?
In which period was the calendar originally thought up?
In what period was the timetable firstly established?
During what period was the calendar creation?
In which period was the calendar arise for the first time?