This is because Ethiopia follows the Ge'ez calendar, which is seven to eight years behind the Gregorian calendar used by most countries. The Ge'ez calendar has 13 months. It includes 12 months of ...

The album’s title is inspired by an Ethiopian tourism slogan ... the fact that Ethopia’s traditional calendar (or Geʽez calendar) which has 13 months instead of 12 (the 13th month is made ...