Many nations around the world have their own calendars, but which one is the earliest? There exists a calendar that predates all nations and even existed before Noah, making it undoubtedly the earliest calendar in the world.
Genesis 7:11, states: “In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.”
The Hebrew calendar was created before Noah, and it is more accurate to call it the Jehovah Calendar.
According to the teachings of Jewish Rabbis, the first day of Ethanim is the sixth day of creation, which is the day Adam was created. This year (2024 AD) is 5784 FC (From Creation).
The Civil Calendar considers Ethanim as the first month. The months that appear in Genesis are counted in numbers, using the Civil Calendar until Exodus. And the LORD spoke unto Moses and Aaron in the land of Egypt, saying, This month shall be unto you the beginning of months: it shall be the first month of the year to you. Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for a house” (Exodus 12:1-3)
That month is the seventh month of the Civil Calendar, known as Abib. From that point on, Abib became the first month, which marks the start of the Biblical Calendar. The seventh, eighth, ninth, tenth, eleventh, and twelfth months of the Civil Calendar then become the first, second, third, fourth, fifth, and sixth months of the Biblical Calendar. Dates after Exodus are all calculated using the Biblical Calendar.