Igbo (WAT)
| Epoch | Confidence | Associated with |
|---|---|---|
| Unknown | High | Onitsha, Nigeria |
Overview
The Igbo calendar is a calculated solar calendar used by the Igbo people of Nigeria. It has 13 months of 28 days each, except for the final month which has 29 days for a total of 365 days in a year.
The Igbo week consists of 4 days, each with an associated market, named Eke, Orie, Afo, and Nkwo. Each month is 7 weeks long.
The Igbo calendar has no central authority and limited specific rules, so the start of the day may be at sunrise, though this site uses midnight in Nigeria. Years are not specifically counted in this calendar’s usual practice.
Info
Since this calendar is 365 days with no intercalation, it drifts relative to the equinoxes by about 1 day every 4 years.
| Months | Days | Approximate Gregorian alignment |
|---|---|---|
| Ọnwa Mbụ | 28 | February–March |
| Ọnwa Abụọ | 28 | March–April |
| Ọnwa Ife Eke | 28 | April–May |
| Ọnwa Anọ | 28 | May–June |
| Ọnwa Agwụ | 28 | June–July |
| Ọnwa Ifejiọkụ | 28 | July–August |
| Ọnwa Alọm Chi | 28 | August–early September |
| Ọnwa Ilọ Mmụọ | 28 | Late September |
| Ọnwa Ana | 28 | October |
| Ọnwa Okike | 28 | Early November |
| Ọnwa Ajana | 28 | Late November |
| Ọnwa Ede Ajana | 28 | Late November–December |
| Ọnwa Ụzọ Alụsị | 29 | January–early February |
| Weekdays |
|---|
| Eke |
| Orie |
| Afo |
| Nkwo |
Accuracy
Since this calendar is pracrticed by many different people and has no central authority, it is likely that it only matches some groups' interpretation of the calendar.
I was unable to find any specific point at which the day starts, but it seems any time before or up to sunrise is acceptable.
Wikipedia noted that 10 March 2012 marked the year-counting festival and noted that it was the 1013th year based on the "lunar calendar", though the source is dead. I was unable to verify anything related to this claim and have decided not to use it.