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The article demonstrates the weekly seasonalities for common stock returns in the stock markets of the U.S., Great Britain, Canada, South Korea, Japan and Australia for 1980-1984. This day-of-the-week effect is characterized by low returns in the beginning of the week and high returns at the middle or the end of the week. Investors in the six countries can apply simple trading rules based on the weekend effect. Ignoring transaction costs, this day-of-the-week trading strategy generally outperforms a naive buy-and-hold strategy. However, investors cannot avoid significant out-of-pocket transaction costs such as the bid-ask spread, brokerage commissions or transfer taxes. International correlations on daily stock returns suggest that portfolio profits can be enhanced through a day-of-the-week trading strategy in several countries.