Apparently, there’s no standard for writing dates in Canada. I assumed that Canada used the annoying US-style convention of MM/DD/YYYY. I didn’t realize that the British-style DD/MM/YYYY is also widespread. How exasperating!
Personally, I always write YYYY-MM-DD whenever I can get away with it, as God and ISO 8601 intended. A bill is before the Canadian parliament aiming at standardizing on year-month-day formats.