2017年04月 / Exploring the history and evolution of Advent calendars NPR
12345678910111213Who Invented The Calendar of 365 Days The History of Calendar15161718192021222324252627282930Who invented the first calendar WiseAnswers
At what time was the calendar invented?
During what period did the calendar first established?
During what period did the schedule arise?
When was the agenda initially devised?
During what period was the schedule initially conceived?
During what period did the agenda initially introduced?
In what period did the calendar creation?
In which period was the calendar emerge for the first time?