2017年04月 / Who Invented the Calendar A History of the Calendar
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2017年04月14日(金)
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When was the agenda created?
During what period was the agenda initially introduced?
In which period was the calendar come into existence?
In what period was the agenda firstly devised?
During what period was the calendar originally envisioned?
In which period was the schedule firstly devised?
In what period did the timetable generation?
In which period was the schedule emerge for the first time?