Because today is Friday the 13th, I decided to make a calculator that not only calculates all Friday the 13ths between1901 and 2099, it is also capable of calculating all Friday the 113ths, Friday 213ths, Friday 313ths, and so on, all the way up to Friday the 72913ths (It can technically calculate it infinitely, but 72913ths is the highest it will calculate with the limit of 200 years I put on it to not require extra leap year coding). (These Friday the x13ths would be the correct day if the month that the x13th is in never ended)
