A day earlier, the US and Russia announced a plan to bring about a ceasefire in Syria, SANA news agency reported.
The ceasefire was planned to start on Monday, the first day of the Muslim Feast of Sacrifice or Bakre Eid holiday.
"Today we are announcing an arrangement that we think has the capability of sticking, but it's dependent on people's choices," Kerry said in Geneva.
The planned ceasefire is not the first to be agreed upon by both powers, as last February both agreed on a similar cessation of hostilities that held in some parts of the country, including the capital Damascus, and failed in other parts, mainly the northern city of Aleppo.
