Black Friday (shopping) Prime Days taking place in 2016 and 2017. Other companies followed with "Black Friday in July" deals which were as good as, or better than, those in November. For many years, retailers pushed opening times on Black Friday earlier and earlier, eventually reaching midnight, before opening on the evening of Thanksgiving. In 2009, Kmart opened at 7:00 a.m. on Thanksgiving, in order to allow shoppers to avoid Black Friday traffic and return home in time for dinner with their families. Two years later, a number of retailers began opening at 8:00 or 9:00 p.m., on what became derisively known as
Friday the 13th year being a common year starting on Tuesday (F) (e.g. 2001/02, 2012/13 and 2018/19), or from August to October the following year being a leap year starting on Saturday (BA) (e.g. 1999/2000 and 2027/28). The shortest period that occurs with a Friday the 13th is just one month, from February to March in a common year starting on Thursday (D) (e.g. 2009, 2015 and 2026). Each Gregorian 400-year cycle contains 146,097 days (with 97 leap days) or exactly 20,871 weeks. Therefore, each cycle contains the same pattern of days of the week and thus the same pattern of Fridays that