What is the exact date of Alan Turing's birth?

The exact date of Alan Turing’s birth was 23 June 1912. He was born in Maida Vale, London, to Julius Mathison Turing, a member of the Indian Civil Service, and Ethel Sara Turing.

Turing grew up during a period when formal computing did not yet exist as a practical field. He later studied mathematics at King’s College, Cambridge, where his work on computability helped define the theoretical foundations of modern computer science. During the Second World War, he applied that mathematical training to codebreaking at Bletchley Park.

The year 1912 is sometimes confused with 1911 or 1913, but 23 June 1912 is the established date. His birthday has lasting significance in computing history: 23 June is now marked internationally as International Women in Engineering Day’s neighbouring date and, more directly, as the date associated with Alan Turing commemorations and celebrations of his legacy.