"Egyptian expatriates will be able to vote from March 16 to 18," the head of the electoral authority, Lashin Ibrahim, told a news conference.
Ibrahim said the registered candidate will start on January 20 and end on January 29. The electoral campaigns will begin on February 22.
The results of the first round will be announced on April 2, said Ibrahim.
In the case of the second round, he added, expatriates would vote from April 19 to 21 and elections in the country would take place from April 24 to 26.
"The final results will be announced on May 1," he said.
Egyptian President Abdel Fattah al Sisi took office in mid-2014, a year after the ouster of his Islamist predecessor Mohamed Morsi in response to massive protests against his government and the Muslim Brotherhood.
Al Sisi said in November that the presidential elections of 2018 would be held in March or April as planned and stressed that he will not seek to modify the constitutional limit of two four-year presidential terms, so he ruled out a third presidential term for himself.
Although he has not formally announced his candidacy for 2018, Al Sisi is expected to do so and achieve a crushing victory due to the lack of competitive rivals in the presidential campaign.
Khaled Ali, an opposition lawyer and human rights defender, announced in November his intention to participate in the presidential race.
Ahmed Shafiq, former air force commander and former prime minister who fled Egypt after narrowly losing to Morsi in the 2012 election, announced from the United Arab Emirates that he would compete for the presidency. However, on Sunday he declined to run.