In 1975, during International Women's Year, the United Nations began celebrating 8 March as International Women's Day. Two years later, in December 1977, the General Assembly adopted a resolution proclaiming a United Nations Day for Women's Rights and International Peace to be observed on any day of the year by Member States, in accordance with their historical and national traditions. For the United Nations, International Women's Day has been observed on 8 March since 1975. The Day is traditionally marked with a message from the Secretary-General.