This calculator requires the use of Javascript enabled and capable browsers. For those that are superstitious, this creates and displays a list of all Fridays that are the 13th of the month for the time period of your choice. Select the initial and final years for the search. You may also limit the search to a particular month; the default is all months. Click on Calculate and view the results. You may also copy the results to the Windows clipboard for transfer to other applications.