Sources in the President Office said that Hussain approved July 25 and signed the document to be sent to the ECP to grant it permission to go ahead and hold polls.
According to the law, ECP proposes dates to the president to organize general elections, who is empowered to fix the final date.
The present government will complete the tenure on May 31 and the caretaker government will take over form June 1 and remain in office until a new government is set up through elections.
It is the second consecutive elected government that is poised to complete the five-year tenure. It was elected in 2013.
Earlier, the ECP announced that a total of 105.95 million voters will use their right of vote to elect the new government.
Among them are 59.2 million male and 46.7 million female voters, showing A gender gap of over 12.5 million.