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
Common year starting on Friday has only one Friday the 13th; The only Friday the 13th in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February. This is the only year type where the "n"th "Doomsday" (this year Sunday) is not in ISO week "n"; it is in ISO week "n"-1. In the (currently used) Gregorian calendar, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle does only span across century