Igbo calendar
The Igbo calendar (Igbo: Ọ̀gụ́àfọ̀ Ị̀gbò) is the traditional calendar system of the Igbo people from present-day Nigeria. The calendar has 13 months in a year (Afọ), 7 weeks in a month (Ọnwa), and 4 days of Igbo market days (Eke, Orie, Afọ, and Nkwọ) in a week (Izu) plus an extra day at the end of the year, in the last month.