Philippine Declaration of Independence
Following the end of World War II, the United States granted independence to the Philippines on 4 July 1946 via the Treaty of Manila. July 4 was observed in the Philippines as "Independence Day" until August 4, 1964 when, upon the advice of historians and the urging of nationalists, President Diosdado Macapagal signed into law Republic Act No. 4166 designating June 12 as the country's "Independence Day". June 12 had previously been observed as "Flag Day" and many government buildings are urged to display the Philippine Flag in their offices.
Republic Day (Philippines)
Initially, the nation's Independence Day holiday (Araw ng Kalayaan) was held on July 4. President Diosdado Macapagal moved it to June 12, the date in 1898 on which Emilio Aguinaldo issued the Philippine Declaration of Independence from Spain. Philippine Republic Day was created in its place and kept as a holiday under Macapagal, coinciding with the United States's own Independence Day.