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FAQe FAQs -- Math

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FAQeFAQs - How many friday 13th's?
How many friday 13th's?
If you do the math you find some interesting FAQs. There are ONLY 14 possible calendar years. One year for each day of the week where January 1st starts on (Sun, Mon, Tues, Wed, Thurs, Fri, Sat) and another 7 years that have February 29th. There will be a Friday the 13th in every month that starts on a Sunday.

The months that start on Sunday:
YearStarts onDays in FebMonths starting on Sunday
2006Sun28Jan, Oct
2007Mon28Apr, Jul
2009Thurs28Feb, Mar, Nov
2012Sun29Jan, Apr, July
2013Tues28Sept, Dec
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