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) Black Friday. In 2015, Black Friday was predicted to become the biggest day of shopping in Britain, with as much as £2bn spent in shops and online in 24 hours. However, many large retailers have discontinued, downplayed or heavily modified the concept since 2014, sometimes citing disruption to Christmas trading patterns or bad publicity. Black Friday appears to be growing in popularity year on year in the UK. In 2016, total spending on online retail sites on Black Friday 2016 was £1.23bn, marking a +12.2% increase on the £1.1bn spent on the same day in 2015. In 2017, retail sales