Friday the 13th is a day considered unlucky in Western superstition, occurring when the 13th day of a month falls on a Friday. This happens at least once a year but can occur up to three times. Specific years, like common years starting on Thursday, have three Friday the 13ths in February, March, and November. Leap years beginning on Sunday also have three Friday the 13ths in January, April, and July. Other years have either two or just one Friday the 13th.
The 28-year cycle for Friday the 13th occurrences began on 1 March 1900.
In 1907, T. W. Lawson's novel "Friday, the Thirteenth" was published, potentially contributing to the popularization of the superstition. The novel features a broker exploiting the superstition to cause a Wall Street panic.
In 1984, a leap year starting on Sunday, there were three Friday the 13ths: in January, April, and July.
In 1993, a study by Scanlon, Luben, Scanlon, & Singleton suggested a possible increase in hospital admissions due to transport accidents on Friday the 13th, but the authors noted the small sample size and subsequent studies disproved any correlation.
Since 1995, Finland has observed National Accident Day (kansallinen tapaturmapäivä) on Friday the 13th, promoted by governmental and nongovernmental organizations and coordinated by the Finnish Red Cross to raise awareness about automotive safety.
The longest period without a Friday the 13th can be 14 months, such as from August 1999 to October 2000 in a leap year starting on Saturday.
In 2000, the parody film "Shriek if You Know What I Did Last Friday the Thirteenth" was released in Italy as "Shriek – Hai impegni per venerdì 17?"
The longest period without a Friday the 13th can be 14 months, such as from August 1999 to October 2000 in a leap year starting on Saturday.
In 2001, there were two occurrences of Friday the 13th.
In 2002, there were two occurrences of Friday the 13th.
In 2003, there was one occurrence of Friday the 13th.
In 2004, there were two occurrences of Friday the 13th.
In 2005, there was one occurrence of Friday the 13th.
In 2006, there were two occurrences of Friday the 13th.
In 2007, there were two occurrences of Friday the 13th.
In June 2008, the Dutch Centre for Insurance Statistics reported that fewer accidents, fires, and thefts occur on Friday the 13th in the Netherlands, attributing it to increased caution or people staying home. They noted an average of 7,500 traffic accidents on Friday the 13th compared to the usual 7,800.
In 2008, there was one occurrence of Friday the 13th.
In 2009, a common year starting on Thursday, there were three Friday the 13ths: in February, March and November.
The shortest period with a Friday the 13th is just one month, such as from February to March in the common year 2009 starting on Thursday.
In 2010, there was one occurrence of Friday the 13th.
In 2011, there was one occurrence of Friday the 13th.
In 2012, a leap year starting on Sunday, there were three Friday the 13ths: in January, April, and July.
The longest period without a Friday the 13th can be 14 months, such as from July 2012 to September 2013 in a common year starting on Tuesday.
In 2013, there were two occurrences of Friday the 13th.
In 2014, there was one occurrence of Friday the 13th.
In 2015, a common year starting on Thursday, there were three Friday the 13ths: in February, March and November.
The shortest period with a Friday the 13th is just one month, such as from February to March in the common year 2015 starting on Thursday.
In 2016, there was one occurrence of Friday the 13th.
In 2017, there were two occurrences of Friday the 13th.
In 2018, there were two occurrences of Friday the 13th.
The longest period without a Friday the 13th can be 14 months, such as from July 2018 to September 2019 in a common year starting on Tuesday.
In 2019, there were two occurrences of Friday the 13th.
In 2020, there were two occurrences of Friday the 13th.
In 2021, there was one occurrence of Friday the 13th.
In 2022, there was one occurrence of Friday the 13th.
In 2023, there were two occurrences of Friday the 13th.
In 2024, there were two occurrences of Friday the 13th.
In 2025, there will be one occurrence of Friday the 13th.
In 2026, a common year starting on Thursday, there will be three Friday the 13ths: in February, March and November.
The shortest period with a Friday the 13th is just one month, such as from February to March in the common year 2026 starting on Thursday.
In 2027, there will be one occurrence of Friday the 13th.
The longest period without a Friday the 13th can be 14 months, such as from August 2027 to October 2028 in a leap year starting on Saturday.
In 2028, there will be one occurrence of Friday the 13th.
In 2029, there will be two occurrences of Friday the 13th.
The longest period without a Friday the 13th can be 14 months, such as from July 2029 to September 2030 in a common year starting on Tuesday.
In 2040, a leap year starting on Sunday, there will be three Friday the 13ths: in January, April, and July.
The 28-year cycle for Friday the 13th occurrences ends on 28 February 2099.
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