The Ethiopian calendar is ~7 years behind the Gregorian calendar due to them having a 13th month of either 5 or 6 days (in the case of a leap year). They celebrated the new millennium on Sept. 12, 2007. – WTF Fun Facts
Source: https://theculturetrip.com/africa/ethiopia/articles/why-is-the-ethiopian-calendar-7-years-behind/
