Federal judge Lewis Kaplan in Manhattan set the Sept. 13, 2010 trial date at a Thursday hearing for Ahmed Ghailani.
Authorities allege he was a bomb-maker, document forger and aide to Osama bin Laden. The attacks at embassies in Tanzania and Kenya killed 224 people, including 12 Americans.
Ghailani was brought to the United States last month. The government has not decided whether to seek the death penalty if it wins a conviction.
The Tanzanian, captured in Pakistan in 2004, was held at the naval prison in Cuba since 2006.