The original was actually closer to accurate than the "correction".
Canada declared war on Japan on December 7, 1941 (That's a lot closer to 1942 than to 1939, for the math impaired) following the Japanese surprise attack on Hong Kong. (Canadian forces were sent to Hong Kong in November, 1941). The official declaration was issued the next day, December 8, 1941.
So, of course, they couldn't get organized on rounding up the Nips until after the new year, or in 1942.