The date will mark the end of ailing President Muhammadu Buhari’s first term. He has not said if he will run again.
Buhari came to power in 2015, promising to crack down on endemic corruption, rid the country of the Boko Haram Islamist insurgency in the northeast and kickstart a flagging economy.
Critics say his presidency has been marred by inertia and little progress has been made on those key policies.
Buhari has been absent for much of 2017 because of an undisclosed medical problem, which calls into question whether he will stand next year. It also creates uncertainty for his All Progressives Congress party that was created to elect him.
The elections are exactly 504 days away from today.