According to MyGuru, an online resource for information regarding Hinduism, the date of the main night of Diwali in 1947 was Nov. 12. Diwali is an ancient festival that has great importance in Hinduism and Indian culture.
Encyclopedia Britannica explains that 1947 was a particularly important year in Indian history. The year saw Lord Mountbatten serve as the final English viceroy in India. By July 1947, the Indian Independence Act had been passed by the British Parliament. This resulted not only in India's independence but also its partition into the modern nation-states of India and Pakistan, forcing 15 million Hindus, Sikhs and Muslims from their homes.