Egyptian chronology is the study of events in Ancient Egypt and trying to date when they took place. There is a general agreement about the correct chronology among Egyptologists. The Old Kingdom began in the 27th century BC, the Middle Kingdom in the 21st century BC, and the New Kingdom in the mid-16th century BC.
However, some details are still disputed. The dates for the Early Dynastic Period can vary by up to 300 years, those of the New Kingdom by up to 30 years, and those if the the Late Period by up to a few years.[1]
Some individual Egyptologists have come up with alternative chronologies. For example, the "New Chronology," which was proposed in the 1990s, changes the New Kingdom dates by 350 years, and the "Glasgow Chronology," which was proposed from 1978 to 1982, changes the New Kingdom dates by 500 years.