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
Friday the 13th (1980 film) VHS, LaserDisc and DVD releases included the R-rated theatrical version). The uncut version of the film contains approximately 11 seconds of previously unreleased footage. In 2011, the uncut version of "Friday the 13th" was released in a 4-disc DVD collection with the first three sequels. It was again included in two Blu-ray sets: "Friday the 13th: The Complete Collection", released in 2013, and "Friday the 13th: The Ultimate Collection", in 2018. Contemporary scholars in film criticism, such as Tony Williams, have credited "Friday the 13th" for initiating the subgenre of the "stalker" or slasher film. Cultural critic Graham Thompson also