21 September
Each year the International Day of Peace is observed around the world on 21 September. The General Assembly has declared this as a day devoted to strengthening the ideals of peace, both within and among all nations and peoples.
In 1981, the General Assembly declared that the opening day of its regular session in September "shall be officially dedicated and observed as the International Day of Peace and shall be devoted to commemorating and strengthening the ideals of peace both within and among all nations and peoples" (resolution 36/67).
On 7 September 2001, the Assembly decided that, beginning in 2002, the International Day of Peace shall be observed on 21 September each year. It declared that the day shall henceforth be observed as a day of global ceasefire and non-violence, an invitation to all nations and people to honour a cessation of hostilities throughout the day. It also invited Member States, United Nations bodies, regional and non-governmental organisations to commemorate the day and to cooperate with the United Nations in establishing the global ceasefire.
Source: United Nations International Day of Peace
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