09/20/1940
https://www.presidency.ucsb.edu...
"Leave shall be granted at such time or times as may be deemed to be in the public interest."
"Except in the case of temporary employees, Sundays and holidays occurring within a period of annual leave shall not be charged as annual leave."
"Annual leave shall accrue to an employee while in a leave-with-pay status."
"I do hereby call upon officials of the Government to display the flag of the United States on all Government buildings on April 13, 1938."