When Did Canada Join WWI?

Canada was a proud member of the British Empire,later the Commonwealth,and she declared war along with Britain because she wanted to fight evil.The same goes to the other Dominions of the Crown,Australia,New Zealand and South Africa.a
All of the other nations of the world wide empire also rushed to Britains side in both world wars.Of course it started August 1914. My own Father volunteered and joined his Yorkshire regiment 2 weeks later.

4th August 1914,
Canada was a dominion of Great Britain, hence, when Britain entered the war on that date, Canada along with the other commonwealth countries joined the Great War.