2017年04月 / when was the calendar invented
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The History of Calendars and How They Evolved Calendar
2017年04月14日(金)
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In which period did the agenda created?
At what time was the schedule initially introduced?
At what time was the calendar arise?
During what period did the schedule originally created?
In which period did the schedule firstly imagined?
In what period did the timetable firstly devised?
At what time did the timetable generation?
At what time did the calendar emerge for the first time?