Ooops, Wofa, we posted at the same time.

I don't understand your explanation of the quinzaine de jours (maybe I've not had enough coffee yet )

I understand that counting from the first Sunday to the last Sunday gives fifteen days, but why would we arbitrarily eliminate the Saturday. That explanation seems a good example of begging the question.

And if we count the actual number of days we are not at work, it is sixteen.