AlHijjah 8, 1433, Oct 24, 2012, SPA -- The United Nations Educational, Scientific, Cultural Organization(UNESCO0) has fixed December 18 of every year as a World Day to grace Arabic language, it was announced here today. in a statement, UNESCO said the decision was based on a joint proposal submitted by the Kingdom of Saudi Arabia and Morocco to celebrate the mother tongue of more than 422 million Arab people and needed by more than 1.5 billion Muslims.