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Friday the 13th

Friday the 13th is often considered by those who believe in superstition to be a day of bad luck. The fear of Friday the 13th is called paraskavedekatriaphobia. It is a form of triskaidekaphobia, fear of the number thirteen.

The following months have a Friday the 13th:

This sequence, here given for 2000-2027, repeats every 28 years from 1901 to 2099.

Because the Gregorian Calendar 400-year cycle has a whole number of weeks, it is not possible for exactly 1 in 7 months to have a Friday the 13th. In fact, the 13th is more likely to be a Friday than any other day of the week.

The months of Friday 13th are determined by the Dominical letter of the year

There is also a series of horror films featuring Friday the 13th in their titles. See Friday the 13th movie