The funeral "will take place" on August 28 in Luanda at 10:00 am (1100 GMT), according to a foreign ministry note verbale to foreign diplomats in Luanda seen by AFP on Wednesday.
Dos Santos, who ruled Angola with an iron fist for 38 years, died on July 8 at a hospital in Barcelona after suffering cardiac arrest.
The government and his children have been at odds over when and where he would be buried.
His 44-year-old daughter Tchize dos Santos has insisted he had wanted to be buried in Spain, where he had lived since 2019.
But a Spanish court last week ordered the body be released to his Luanda-based widow and repatriated to Angola.
His body was returned to Luanda on Saturday evening.
When he stepped down in 2017, dos Santos handed over to former defence minister Joao Lourenco whom he had handpicked to succeed him.
Lourenco is seeking re-election in a tightly fought election taking place on Wednesday.