The Ethiopia calendar is the principal calendar used in Ethiopia and also serves as the liturgical year for Christian. It adds a leap day every four year without exception.
A seven to eight year gap between and Gregorian calendar result from an alternate calculation in determining the date of the annunciation so now in Ethiopia it is 2009 and Gregorian calendar 2017.
The Ethiopia calendar has 12 months of 30 days plus 5 or 6 epagomenal days which comprise a 13 months.