The UN's special envoy to Syria, Staffan de Mistura, has said peace talks have been pushed back by two days to March 9 to allow the cessation of hostilities to "settle down."
The previous round of peace talks in February collapsed after two days.
The latest truce brokered by the United States and Russia has led to a marked reduction in violence, but both sides have complained of violations.
President Bashar al-Assad said in an interview that the government would “do our part so that the whole thing works."
He added that that a "full amnesty" was on offer for rebel fighters if they agreed to disarm.
Russia said it had recorded 15 truce violations in the past 24 hours across Syria.
Foreign Minister Sergei Lavrov called for the closure of Syria's border with Turkey to prevent supplies reaching "terrorist" groups.
France has expressed concern about reports of strikes by Syrian and Russian aircraft on areas controlled by rebels.