Calendars were created in agricultural societies. The dates when the rainy seasons begin are predictable. By having a calendar, it is possible to predict in advance when the planting had harvest seasons should start. Thus, everything can be prepared in advance.
Obid created the 365 calendar
The incans
The Julian Calendar was created by Julius Caesar. It was introduced in 46 BC. The calendar began to be used on January 1, 45 BC, and was used until replaced with the Gregorian Calendar in 1582.
The Mayan civilization!
Rome, I believe.
The Newgate Calendar was created in 1774.
Positivist calendar was created in 1849.
Kingfisher Calendar was created in 2003.
Country Calendar was created in 1966.
Lemarean Calendar was created in 2002.
Calendar Man was created in 1958.
Fasli Calendar was created in 1650.
The Calendar of Nature was created in 1821.
Premier Calendar was created in 1959.
Pirelli Calendar was created in 1964.
Jazz Calendar was created in 1968.
A Calendar of Wisdom was created in 1910.