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en.wikipedia.org/wiki/History_of_calendars

The first calendars based on Zoroastrian cosmology appeared in the later Achaemenid period (650 to 330 BCE). They evolved over the centuries, but month names changed little until now. The unified Achaemenid Empire required a distinctive Iranian calendar, and one was devised in Egyptian tradition, with 12 months of 30 days, each dedicated to a yazata (Eyzad), and four divisions resembling the ...

www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=ac06

So probably is the first Egyptian calendar. And a lunar calendar is still in use today in Islam. But such a calendar has one major disadvantage. The length of a lunar month, from one new moon to the next, is 29.5 days. So twelve lunar months are 354 days, approximately 11 days short of a solar year.

www.reference.com/science/invented-first-calendar-f4255d5095d8fd98

Evidence indicates that the first calendar was created by the Stone Age people in Britain about 10,000 years ago. The earliest known calendar was a lunar calendar, which tracked the cycles of the moon. According to National Public Radio, the first calendar consisted of 12 pits with large rocks that mimicked the lunar cycles.

www.answers.com/Q/Who_invented_the_first_calendar

Nobody knows who invented the first calendar because there are different calendars: the first calendar form appeared 20,500 BC, and probably was the lunar calendar. Asked in History of Asia , Calendar

www.whoinventedit.net/who-invented-the-calendar-we-have-today.html

Why the Gregorian Calendar Replaced the Julian Calendar. Julius Caesar invented the Julian system. All months had either 30 or 31 days, except for February. February or Februalia had 29 or 30 days depending on whether it was a leap year or not. Caesar named one month after himself, July. When Octavian became Roman emperor, he also renamed a ...

www.quora.com/Who-invented-the-calendar

According to National Public Radio, the first calendar consisted of 12 pits with large rocks that mimicked the lunar cycles. The creators of the calendar were hunter-gatherers who used the calendar to keep abreast of when certain animals migrated ...

www.history.com/news/6-things-you-may-not-know-about-the-gregorian-calendar

6. Before the Gregorian calendar’s adoption, the English new year began on March 25, or Lady Day. Julius Caesar’s calendar reform of 46 B.C. instituted January 1 as the first of the year.

www.seeker.com/how-was-the-calendar-invented-1792531780.html

How Was The Calendar Invented? ... It was supposed to be celebrated on the Sunday after the first full moon after the spring equinox, or March 21st. But as it slipped later and later each year ...

www.whoinventedfirst.com/who-invented-the-calendar

The calendar is one of our first and most basic tools for measuring time. The first thing that must have struck our early ancestors are the repeating cycles of time evident in living on a planet. The repetitions of day and night are the most obvious.

www.answers.com/Q/Who_invented_the_365_day_calendar

The 365 day calendar was technically first invented by the ancient Egyptians. They had a 360 day calendar that had 12 months with 3 seasons (Akhet - June 15 to October 15, Proyet - October 15 to ...