President Muhammadu Buhari has signed into the law the Public Holiday (Amendment) Bill, according to his National Assembly Liaison Officer, Senator Ita Enang.
The new law accommodates June 12 as a public holiday in Nigeria, replacing May 29.
May 29 will only be marked as a handover/inauguration of new governments in the country.
The signing came just days to June 12, giving legal backing to the day.
The National Assembly recently passed the amendment bill.