11/20/1947
https://www.presidency.ucsb.edu...
"I do hereby designate December 10, 1949, and December 10 of each succeeding year as United Nations Human Rights Day."
"This order shall become effective on the thirtieth day following the date hereof."
"Now, Therefore, I, Harry S. Truman,President of the United States of America, acting under and by virtue of the authority vested in me by the Constitution and the statutes, including the said section ..."
"I hereby designate such Commission as a public international organization entitled to enjoy the privileges, exemptions, and immunities conferred by the said International Organizations Immunities Act."