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:

• 2000 October
• 2001, 2007, 2018 April, July
• 2002, 2013, 2019, 2024 September, December
• 2003, 2008, 2014, 2025 June
• 2004 February, August
• 2005, 2011, 2016, 2022 May
• 2006, 2017, 2023 January, October
• 2009, 2015, 2026 February, March, November
• 2010, 2021, 2027 August
• 2012 January, April, July
• 2020 March, November

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.

There is also a horror film : Friday the 13th