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.
Maura Law
Nu’ain Bin Abdulhaqq, an official of the Moro Islamic Liberation Front (MILF), contends that a proclamation by President Diosdado Macapagal changing the celebration date for Philippine independence June 12, 1898 (a date earlier than the December 10, 1898 signing date of the Treaty of Paris) as the date of Philippine independence provides the pretext for Moro independence by redefining the geographical extent of the country to its pre-treaty boundaries under Maura law.