Friday the 13th is a day considered unlucky in Western superstition. It occurs when the 13th day of a month falls on a Friday. This happens at least once a year and can occur up to three times. Common years starting on Thursday (e.g., 2009, 2015, 2026) and leap years starting on Sunday (e.g., 2012, 2040) each have three Friday the 13ths. Some years have two Friday the 13ths (e.g., 2001, 2023), while others have only one (e.g., 2021, 2025).
From March 1900, the sequence of Friday the 13th follows a 28-year cycle.
In 1907, T. W. Lawson's novel "Friday, the Thirteenth" was published, potentially contributing to the popularization of the superstition. The novel features a Wall Street panic created by an unscrupulous broker on Friday the 13th.
In 1984, there were three Friday the 13ths in January, April, and July.
In 1993, a study by Scanlon, Luben, Scanlon, & Singleton suggested a potential increase in hospital admissions due to transport accidents on Friday the 13th. However, the authors noted the numbers were too small for meaningful analysis, and subsequent studies have disproved any correlation.
Since 1995, Finland has observed National Accident Day (kansallinen tapaturmapäivä) on Friday the 13th to raise awareness about automotive safety. The event is coordinated by the Finnish Red Cross.
From August 1999 to October 2000, there was a 14-month period without a Friday the 13th.
From August 1999 to October 2000, there was a 14-month period without a Friday the 13th.
In 2000, the parody film "Shriek if You Know What I Did Last Friday the Thirteenth" was released in Italy under the title "Shriek – Hai impegni per venerdì 17?" ("Shriek – Do You Have Something to Do on Friday the 17th?").
From July 2001 to September 2002, there was a 14-month period without a Friday the 13th.
In 2001, there were two Friday the 13ths.
In the 2000s, 2001 had two Friday the 13ths.
In 2002, there were two Friday the 13ths.
In the 2000s, 2002 had two Friday the 13ths.
In 2003, there was only one Friday the 13th.
In 2004, there were two Friday the 13ths.
In 2005, there was only one Friday the 13th.
In 2006, there were two Friday the 13ths.
In the 2000s, 2006 had two Friday the 13ths.
In 2007, there were two Friday the 13ths.
In the 2000s, 2007 had two Friday the 13ths.
In June 2008, the Dutch Centre for Insurance Statistics reported that fewer accidents and reports of fire and theft occur on Friday the 13th in the Netherlands, suggesting people are more careful on that day.
In 2008, there was only one Friday the 13th.
In 2009, a common year starting on Thursday, there were three Friday the 13ths in February, March, and November.
In 2009, the shortest period with a Friday the 13th occurred from February to March.
In 2009, there were three Friday the 13ths in February, March, and November.
In the 2000s, 2009 had three Friday the 13ths.
In 2010, there was only one Friday the 13th.
In 2011, there was only one Friday the 13th.
From July 2012 to September 2013, there was a 14-month period without a Friday the 13th.
In 2012, a leap year that begins on Sunday, there were three Friday the 13ths in January, April, and July.
In 2012, there were three Friday the 13ths in January, April, and July.
In the 2010s, 2012 had three Friday the 13ths.
In 2013, there were two Friday the 13ths.
In the 2010s, 2013 had two Friday the 13ths.
In 2014, there was only one Friday the 13th.
In 2015, a common year starting on Thursday, there were three Friday the 13ths in February, March, and November.
In 2015, the shortest period with a Friday the 13th occurred from February to March.
In 2015, there were three Friday the 13ths in February, March, and November.
In the 2010s, 2015 had three Friday the 13ths.
In 2016, there was only one Friday the 13th.
In 2017, there were two Friday the 13ths.
In the 2010s, 2017 had two Friday the 13ths.
From July 2018 to September 2019, there was a 14-month period without a Friday the 13th.
In 2018, there were two Friday the 13ths.
In the 2010s, 2018 had two Friday the 13ths.
In 2019, there were two Friday the 13ths.
In the 2010s, 2019 had two Friday the 13ths.
In 2020, there were two Friday the 13ths.
In the 2020s, 2020 had two Friday the 13ths.
In 2021, there was only one Friday the 13th.
In 2022, there was only one Friday the 13th.
In 2023, there were two Friday the 13ths.
In the 2020s, 2023 had two Friday the 13ths.
In 2024, there were two Friday the 13ths.
In the 2020s, 2024 had two Friday the 13ths.
In 2025, there will be only one Friday the 13th.
In 2026, a common year starting on Thursday, there will be three Friday the 13ths in February, March, and November.
In 2026, the shortest period with a Friday the 13th will occur from February to March.
In 2026, there will be three Friday the 13ths in February, March, and November.
In the 2020s, 2026 will have three Friday the 13ths.
From August 2027 to October 2028, there will be a 14-month period without a Friday the 13th.
In 2027, there will be only one Friday the 13th.
In 2028, there will be only one Friday the 13th.
In 2029, there will be two Friday the 13ths.
In the 2020s, 2029 will have two Friday the 13ths.
In 2040, a leap year that begins on Sunday, there will be three Friday the 13ths in January, April, and July.
In 2040, there will be three Friday the 13ths in January, April, and July.
The sequence of Friday the 13th follows a 28-year cycle ending on February 28, 2099.
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