2017年04月 / History of calendars Wikipedia
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Gregorian calendar Wikipedia
2017年04月14日(金)
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At what time was the schedule invented?
In which period was the calendar initially developed?
In what period was the timetable come into existence?
In what period did the timetable firstly created?
In which period did the timetable originally imagined?
In which period did the agenda firstly created?
During what period did the calendar creation?
During what period was the timetable emerge for the first time?