August 4, 1964: June 12 was designated the Independence Day

On , President Diosdado Macapagal signed Republic Act No. 4166 into law, formally and permanently designating June 12 as the Independence Day of the Philippines. The same law renamed the old July 4 holiday as Philippine Republic Day, recasting it as a commemoration of the country's 1946 recognition by the United States rather than the nation's founding act of self-determination.