During the traditional Sunday sermon at the St. Peter’s Square in Vatican City, The Holy Father it declared February 23rd as ‘the Day of Prayer and Fasting for the Peace”.
During his sermon, Pope Francis said: “I am calling for the celebration of February 23rd as the Day of Prayer and Fasting for the Peace because of tragedies in connection with the continuing conflicts in various parts of the world. In particular, pray for the Democratic Republic of Congo and the people of South Sudan “.
You can read Pope’s 2018 lenten message through this link:
http://press.vatican.va/content/salastampa/en/bollettino/pubblico/2018/02/06/180206c.html