Under the Citizenship Act, every child born after February 15, 1977, is a Canadian. Between 1947 and 1977, the Act provided steps to be taken for registering a child born outside Canada. In 1977, provisions were added to enable people who could not register their children between 1947 and 1977 to do it under the 1977 Act.
On June 5th, 2007. See this statement in context.