Friday the 13th etc.) of the year. Any month that starts on a Sunday contains a Friday the 13th, and there is at least one Friday the 13th in every calendar year. There can be as many as three Friday the 13ths in a single calendar year; either in February, March and November in a common year starting on Thursday (such as 2009, 2015 or 2026) (D), or January, April and July in a leap year starting on Sunday (such as 2012) (AG). The longest period that occurs without a Friday the 13th is 14 months, either from July to September the following
Black Friday (shopping) be considered a mainstream term and not simply as jargon of the emergency services. Since the start of the 21st century, there have been attempts by retailers with origins in the United States such as Amazon to introduce a retail "Black Friday" as it would be understood by Americans, into the United Kingdom. In 2013 Asda (a subsidiary of the American firm Walmart) announced its "Walmart's Black Friday by ASDA" campaign promoting the American concept of a retail "Black Friday" in the UK. Some online and in-shop companies have adopted the American-style Black Friday sale day, although others appear sceptical,