07/03/1951
https://www.presidency.ucsb.edu...
"This order shall become effective sixty days after the date hereof, and shall supersede Executive Order No. 9636 of October 3, 1945, entitled Observance by Government Agencies of Holidays Falling on S..."
"Any action which prevented it would be tragic."
"Whenever a holiday falls on a Sunday, Federal offices and establishments shall be closed to public business on the following Monday."
"This order shall apply to all executive department, independent agencies, and Government-owned or Government-controlled corporations, including their field services."