Ethiopian calendar
The Ethiopian calendar (Amharic;ዓውደ ወር Ge'ez: ዓዉደ ወርሕ; Tigrinya: ዓዉደ ኣዋርሕ), or Ge'ez calendar (Ge'ez: ዓዉደ ወርሕ; Tigrinya: ዓዉደ ኣዋርሕ; Amharic: የኢትዮጲያ ዘመን ኣቆጣጠር) is the official calendar of Ethiopia. It is used as both the civil calendar and an ecclesiastical calendar (in Eritrea as well). It is the liturgical year for Ethiopian and Eritrean Christians belonging to the Orthodox Tewahedo Churches (Ethiopian Orthodox Tewahedo Church and Eritrean Orthodox Tewahedo Church), Eastern Catholic Churches (Eritrean Catholic Church and Ethiopian Catholic Church), and Eastern Protestant Christian P'ent'ay (Ethiopian-Eritrean Evangelical) Churches. The Ethiopian calendar is a solar calendar that has much in common with the Coptic calendar of the Coptic Orthodox Church of Alexandria and Coptic Catholic Church, but like the Julian calendar, it adds a leap day every four years without exception, and begins the year on 29 or 30 August in the Julian calendar. A gap of seven to eight years between the Ethiopian and Gregorian calendars results from an alternative calculation in determining the date of the Annunciation.The Ethiopian calendar has twelve months, all thirty days long, and five or six epagomenal days, which form a thirteenth month.