The Igbo calendar (Igbo: Ògụ́àfọ̀ Ị̀gbò) is the traditional calendar system of the Igbo people which has 13 months in a year (afo), 7 weeks in a month (onwa), and 4 days of Igbo market days (afor,nkwo,eke and orie) in a week (izu) plus an extra day at the end of the year, in the last month. The name of these months was reported by Onwuejeogwu (1981).[1]