Using a contrived formula that's difficult to understand or quickly check for correctness to solve a problem whose answer doesn't come from anything mathematica

Using a contrived formula that's difficult to understand or quickly check for correctness to solve a problem whose answer doesn't come from anything mathematical (i.e., the number of days in each month were arrived at arbitrarily, not via any formula) and just happens to work is NOT good style. At best it's cute and irrelevant (and doesn't even work for all of the twelve cases...). Wow. Edit: also, if you're mapping the month string to an integer anyway, I don't see how you're going to do that without doing basically the same thing as the switches you posted anyway.