In what period was the calendar created?
In which period did the schedule initially introduced?
At what time did the calendar arise?
At
what time did the schedule firstly created?
During what period did the timetable originally conceived?
During what period was the calendar initially established?
During what period did the agenda inception?
In which period was the agenda come about for the first time?
- 04/13/01:39
- Gregorian calendar Wikipedia
