The inauguration for n The Gambia’s new president will take place at the country’s embassy in neighbouring Senegal.
The message, posted on Adama Barrow’s social media accounts, invited the general public to attend the ceremony.
Last-ditch efforts by regional leaders to convince Yahya Jammeh to step down as president failed overnight.
He lost elections last month, but wants the results annulled citing errors in the electoral process.
West African military forces are ready to enforce a transfer of power in The Gambia, a popular beach destination among European holidaymakers.
Residents on the run
Civilians have been reported to have crossed into Senegal with women and children taking the huge percentage the UN refugee agency said, citing Senegalese government figures.
In the Gambian capital, Banjul, a restaurant worker who gave only his first name, Musa, told Reuters news agency: “People are afraid, we don’t know what’s going to happen.
“We hope he [Mr Jammeh] will leave so this will be over quickly and things can get back to normal.”
Why is Mr Jammeh refusing to leave office?
Mr Jammeh has declared a 90-day state of emergency, telling security forces to “maintain absolute peace, law and order”.
He says there were irregularities in the election process, including the turning away of some of his supporters from polling stations, and errors made by the electoral commission.