The unique 13-month calendar used in Ethiopia and Eritrea
The Ethiopian calendar is the principal calendar used in Ethiopia and also serves as the liturgical calendar for Christians in Eritrea and Ethiopia. It has 13 months - 12 months of 30 days each, plus a 13th month called Ṗagume with 5 or 6 days. The Ethiopian year is currently 2018, approximately 7-8 years behind the Gregorian calendar due to different calculations of Jesus Christ's birth date.
The Ethiopian calendar is based on the ancient Alexandrian or Coptic calendar, which in turn derives from the Egyptian calendar. The 7-8 year difference from the Gregorian calendar comes from an alternative calculation of the date of the Annunciation. Ethiopian Orthodox tradition holds that Jesus was born 5,500 years after the creation of the world, different from the calculation used by the Roman Catholic Church.
Ethiopia is one of the few African countries that was never colonized, and it has maintained its unique calendar and cultural traditions through the centuries. The Ethiopian calendar is deeply intertwined with the country's Orthodox Christian faith and cultural identity. Time in Ethiopia is also different - the Ethiopian clock starts at dawn (6 AM Gregorian = 12 AM Ethiopian).
In addition to its unique calendar, Ethiopia uses a 12-hour clock that starts at dawn (around 6 AM) rather than midnight. So when it's 7 AM Gregorian time, it's 1 AM Ethiopian time. This system reflects the tropical climate where day and night are roughly equal in length throughout the year.