Determination of the day of the week possible to do all the calculations in one's head with a little practice). None of the methods given here perform range checks, so unreasonable dates will produce erroneous results. Every seventh day in a month has the same name as the previous: "Corresponding months" are those months within the calendar year that start on the same day of the week. For example, September and December correspond, because September 1 falls on the same day as December 1. Months can only correspond if the number of days between their first days is divisible by 7, or in other words, if their
Cyber Monday sales over the previous year. Cyber Monday came to Canada in 2008. The "National Post" featured an article, in the November 25, 2010, edition, stating that the parity of the Canadian dollar with the US dollar caused many Canadian retailers to have Black Friday and Cyber Monday sales of their own. According to the article, an estimated 80% of Canadians were expected to participate in Black Friday and Cyber Monday sales. Speculation has been made that with all major US television broadcasters—which are typically available to Canadians—emphasizing Black Friday and Cyber Monday sales for stores that are also doing business