Dominion Day was the name of the holiday commemorating the formation of Canada as a Dominion on 1 July 1867. It became an official public holiday in 1879. The holiday was renamed to Canada Day by Act of Parliament on 27 October 1982.

Answer this question: when did dominion day changed to canada day? Let's think fast. Stream of consciousness:
This is the relevant information: The holiday was renamed to Canada Day by Act of Parliament on 27 October 1982. So the final answer is 27 October 1982.