In which period did the timetable created?
At what time was the agenda first established?
At what time was the schedule arise?
During what period did the schedule originally created?
During what period did the timetable initially imagined?
In what period was the schedule initially created?
In what period was the agenda inception?
During what period was the schedule emerge for the first time?
- 04/13/01:39
- The Calendar System
