15th August

Unconditional surrender of Japan 14th August 1945

Nehru addressing the Nation - Red fort 15th August 1947

There is actually connection between the two dates. After the Hiroshima and Nagasaki 'Atom' bomb incidents , Japan made an unconditional surrender on 14th August 1945. The next day 15 August 1945 was celebrated by the English as the Success day. 

Two years later, when Lord Mountbatten was addressing a press conference, when questioned about the possible date for the transfer of power, the nearest significant date he could think was of 15 August. Therefore, India got independence on this day.

There is a connection of Japan's surrender and Indian independence.