I submitted this largely for this little nugget: >Since every month has 28–31 days, we know that each month has four weeks plus 0–3 “extra” days. If the date o

I submitted this largely for this little nugget: >Since every month has 28–31 days, we know that each month has four weeks plus 0–3 “extra” days. If the date of the first Thursday is less than or equal to the number of extra days, there will be five Thursdays in that month.