At what time was the timetable devised?
In which period was the calendar first introduced?
In what period did the agenda come into existence?
In which period was
the calendar firstly devised?
During what period was the schedule initially conceived?
In which period was the schedule firstly created?
At what time was the calendar generation?
In what period was the calendar come about for the first time?
At what time was the timetable devised?
In which period was the calendar first introduced?
In what period did the agenda come into existence?
In which period was
the calendar firstly devised?
During what period was the schedule initially conceived?
In which period was the schedule firstly created?
At what time was the calendar generation?
In what period was the calendar come about for the first time?