The International Day of Peace was established in 1981 by a resolution of the United Nations General Assembly to coincide with its opening session, which was held annually on the third Tuesday of September. The first Peace Day was observed in September 1982.
In 2001, the General Assembly by unanimous vote adopted a resolution which established 21 September as an annual day of non-violence and cease-fire.
The United Nations invites all nations and people to honor a cessation of hostilities during the Day, and to otherwise commemorate the Day through education and public awareness on issues related to peace.
You can listen to the U.N. Secretary General’s message of Sustainable Peace for A Sustainable Future.