When was the calendar invented?
In what period did the schedule initially introduced?
At what time did the schedule come into existence?
At what time was the schedule initially devised?
In which period did the timetable initially imagined?
In what period did the agenda initially established?
In what period did the schedule inception?
In which period did the agenda come about for the first time?
When was the calendar invented?
In what period did the schedule initially introduced?
At what time did the schedule come into existence?
At what time was the schedule initially devised?
In which period did the timetable initially imagined?
In what period did the agenda initially established?
In what period did the schedule inception?
In which period did the agenda come about for the first time?
