2017年04月 / The history of calendars
12345678910111213when was the calendar invented15161718192021222324252627282930Maya calendar Wikipedia
Julian calendar Wikipedia
2017年04月14日(金)
【More・・・】
In what period did the calendar invented?
When did the schedule initially introduced?
During what period was the timetable come into existence?
In what period did the schedule initially invented?
In which period did the schedule firstly envisioned?
When was the agenda firstly introduced?
At what time was the calendar generation?
In what period did the calendar emerge for the first time?