On Sept 11 it is the first day of the New Year in Ethiopia. It occurs on Meskerem 1 on the Ethiopian calendar, which is 11 September (or, during a leap year, 12 September) according to the Gregorian calendar. There is a 276 year difference between the Ethiopic and Coptic calendars. … Based on the ancient Coptic calendar, the Ethiopian Calendar is seven to eight years behind the Gregorian calendar, owing to alternate calculations in determining the date of the annunciation of the birth of Jesus Christ.

Below a video from Ethiopian Airlines wishing everyone a happy, healthy prosperous New Year!