Friday the 13th

:There is also a series of Friday the 13th movies, and a TV series called .

Occurrence

The following months have a Friday the 13th:

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• 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. The months with a Friday the 13th are determined by the Dominical letter of the year. All months whose first day falls on a Sunday will contain a Friday the 13th.

Related Topics:
1901 - 2099 - Dominical letter - Sunday

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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.

Related Topics:
Gregorian Calendar - Week

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Over any given 400-year cycle the 13th day of the month occurs 4800 times. The distribution of 13th day of the month is as follows:

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• Monday ( 685 or 14.27% ),
• Tuesday ( 685 or 14.27% ),
• Wednesday ( 687 or 14.31% ),
• Thursday ( 684 or 14.25% ),
• Friday ( 688 or 14.34% ),
• Saturday ( 684 or 14.25% ),
• Sunday ( 687 or 14.31% ).

This means the 13th day of the month is slightly more likely to occur on a Friday.

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