The Ethiopian calendar (Amharic: የኢትዮጵያ ዘመን አቆጣጠር ye'Ītyōṗṗyā zemen āḳoṭaṭer) or Ethiopic calendar is the principal calendar used in Ethiopia and is also the liturgical year of the Eritrean Orthodox Tewahdo Church where it is known as the Ge'ez calendar. It is based on the older Alexandrian or Coptic calendar, which is based on the even older Egyptian calendar, but like the Julian calendar, it adds a leap day every four years without exception, and begins the year on August 29 or August 30 in the Julian calendar.