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 the last two years, Dutch insurers received reports of an average 7,800 traffic accidents each Friday; but the average figure when the 13th fell on a Friday was just 7,500." In years which begin on the same day of the week and are of the same type (that is, whether they are a common year or leap year), Friday the 13th occurs in the same months. This sequence, given here for 1900–2099, follows a 28-year cycle from 1 March 1900 to 28 February 2100. The months with a Friday the 13th are determined by the Dominical letter (G, F, GF,