In a statement announcing the date, UN Secretary General Ban Ki-moon said the warring sides would finally meet for the long-elusive Geneva II peace negotiations which repeatedly have been postponed.
"The conflict in Syria has raged for too long. It would be unforgivable not to seize this opportunity to bring an end to the suffering and destruction it has caused," he said.
Ban hailed efforts by the United States and Russia, and UN and Arab League mediator Lakhdar Brahimi to pave the way for the conference.
The announcement came as Brahimi held closed-door meeting in Geneva with senior US and Russian officials to pin down details for the conference.
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"The purpose is to finalise all the preparations and agree on details for Geneva II," Brahimi's spokeswoman Khawla Mattar told AFP.
The international community has struggled to broker talks between the regime of Syrian President Bashar al-Assad and the rebels battling him since a bloody March 2011 crackdown on Arab Spring-inspired protests.
The so-called Geneva II conference is meant as a follow-up to one held in June 2012, where world powers issued a call for a Syrian transition government.
But Syria's warring sides failed to agree on whether Assad or his inner circle could play a role in the process, and amid spiralling fighting plans for Geneva II have repeatedly been put on hold.
Russia, Assad's key world-power ally, has been pressing the Syrian government to cooperate on the conference. The United States, Britain and France have been working on the fractured Syrian opposition.
But its authority is threatened by Islamist and other militant groups which have warned that anyone taking part in talks will be deemed a traitor.