Algeria's President Abdelaziz Bouteflika will resign before his mandate ends on April 28, his office said on Monday.
Bouteflika would take "steps to ensure state institutions continue to function during the transition period", the presidency said in a brief statement carried by the official APS news agency.
The 82-year-old would resign "before April 28, 2019", after "important decisions" were taken, it added, without specifying when these moves would occur.
Bouteflika has come under mounting pressure to step down since his decision to seek a fifth term despite rarely being seen in public after suffering a stroke in 2013.
The Algerian leader said last month he would pull out of the race and postponed April elections, in moves that angered protesters who saw it as a ploy to extend his two decades in power.
Faced with massive street protests across the North African country, a succession of veteran Bouteflika loyalists have deserted the president in recent days.
On Tuesday, armed forces chief of staff General Ahmed Gaid Salah, who was appointed by Bouteflika in 2004, said the president should either resign or be declared medically unfit to govern by parliament using its constitutional powers.
And on Wednesday, key coalition ally the National Rally for Democracy (RND) headed by recently sacked prime minister Ahmed Ouyahia called for Bouteflika's resignation "with the aim of smoothing the period of transition".
Under the constitution, once his resignation is tendered, the speaker of Algeria's upper house of parliament, Abdelkader Bensalah, would act as interim leader for up to 90 days during which a presidential election must be organized.
It is unclear if Monday's announcement will satisfy anti-government protesters, who have said they do not just want Bouteflika out, but Algeria's entire power structure overhauled.
Algerian national television reported Sunday night that Bouteflika and Prime Minister Noureddine Bedoui had named a new government after weeks of the mass protests and political tensions in this gas-rich North African country. The new government must stay in place during the transition period.
The protests have been driven mostly by young Algerians, who make up a growing part of the population. Demonstrators say they think Bouteflika and his generation are out of touch with the contemporary problems of the country's people. Many Algerian youth struggle to find jobs, and desperation has driven some to attempt to migrate to Europe on rickety boats.
