A. Eritrea
B. Ethiopia
C. Gabon
D. Gambia
Submitted by: Qabil
Its unique calendar system!
Unlike the Western Gregorian calendar with 12 months, Ethiopia follows a 13-month calendar, placing it seven years behind. The Ethiopians welcomed the new millennium on September 11, 2007, adhering to a calendar dating back to 525 AD, preceding the Roman church’s amendment.
The correct answer to the question: "which country has 13 months in a year?" is "Ethiopia".