Ever wondered about the differences between the Hebrew and the Greek calendar?
The Jewish calendar features 12 months with 30 days in each, totaling 360 days in a year, and is based on the lunar cycle. Each individual day actually begins at sundown, "evening and morning were the first day," (Gen 1:5)
In the 4th century A.D., a Jewish religious leader named Hillel calculated the number of years since creation. According to his calculations, 2010-11 is the lunar year of 5771. This was determined by adding the ages of people in the Torah all the way back to the creation in Genesis 1.
The Julian calendar, named for Julius Caesar, was created in 45 B.C. The calendar is made up of 11 months of 30 or 31 days, and an extra shorter month of 28 days. (Feb.) and is based upon the solar cycle. By the Julian reckoning, a solar year comprised 365 days; with the addition of a “leap day” every four years.
The conversion from the Hebrew calender to the Julian occurred around A.D. 325, at the time of the Council of Nicaea. Intended to further separate the Roman Church from it's Hebrew roots.
The Gregorian calendar was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. This is the current calendar in use throughout most of the world.