Dwight Eisenhower actually said...
I, Dwight D. Eisenhower, President of the United States of America, do hereby urge the citizens of this Nation to observe Monday, October 24, 1955, as United Nations Day by means of community programs that will demonstrate their faith in, and support of, the United Nations and that will create a better public understanding of its problems and of its aims and achievements.
Context
Proclamation 3090—United Nations Day, 1955
04/04/1955