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.
Indonesia–Philippines relations
Since Indonesia's proclamation of independence on 17 August 1945 and the Philippines independence on 4 July 1946, the old cordial relationship between Indonesians and the Filipinos are reestablished. On November 24, 1949, the two countries established diplomatic relations. Since 1949, the Indonesian Government has opened its representative office (Consular Office) in Manila but it was not until the early 1950s that a diplomatic office (embassy) was established headed by an Ambassador. To institutionalize the relation between the two countries, a treaty of friendship was signed on 21 June 1951. This Treaty constituted the basic relationship of both countries, covering several aspects such as maintenance of peace and friendship, settlement of disputes by diplomatic and peaceful means, traffic arrangements for citizens of both countries and activities to promote cooperation in the area of trade, cultural, shipping, etc. which include the political, social-economic and security matters of both countries. In 1967, both countries together with Thailand, Singapore and Malaysia founded ASEAN to ensure the peace and stability in the region.