The Ethiopian calendar has 13 months and it is 7 or 8 years behind the Western calendar, so as of 2015, it is only 2008 in Ethiopia.
The Ethiopian calendar is much more similar to the Egyptian Coptic calendar having a year of 13 months, 365 days and 366 days in a leap year (every fourth year) and it is much influenced by the Ethiopian Orthodox Tewahedo Church, which follows its ancient calendar rules and beliefs. The Ethiopian calendar is always seven years and eight months behind the Gregorian (Western) and Eastern Orthodox Church calendars during September and December and eight years and four months behind during January and August.
Pope Gregory XIII reformed the Julian calendar due to the fact that Easter was drifting away from its springtime origins and so lost its relation with the Jewish Passover. Since 1582, the Gregorian (Western) calendar has become the religious, cultural and civil calendar for most of the world. Because of the ideological differences, the Eastern Orthodox Churches and Ethiopian Orthodox Tewahedo Church did not accept the Gregorian calendar and continued to use the Julian calendar with lunar tables for calculating Easter, together with other religious and cultural holidays.
The date of Christmas in the Ethiopian calendar always falls on December 29, but this date is January 7 in the Gregorian calendar i.e. 13 days after the Roman Catholic and Protestant Churches have celebrated their Christmas. However, the date of Easter in the Eastern, Coptic and Ethiopian Orthodox Tewahedo Churches' calendars falls 7 days after the Jewish Passover which date determines the Roman Catholic and Protestant Churches' Easter.