The first unofficial flag of India was hoisted on August 7, 1906 at Parsee Bagan Square in then Calcutta
Although the Indian Independence Act was passed on July 18, 1947, Lord Mountbatten chose August 15 as the day of India's independence since it coincided with Japan's surrender to the Allies during World War II.
Hindi was adopted as the official language of the Union of India on September 14, 1949.
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Apart from India, five more countries celebrate their independence on August 15. South Korea, North Korea, the Republic of Congo, Bahrain, and Liechtenstein.