It still means that.

Correct, noticed the same thing. Should have been a bang in front of each of the terms, your modulus of any of those will return a 0 when hit, which will convert to false and fail each of those conditions.

This solution will do the opposite of what was intended unless the if conditions are inverted. Then it works flawlessly and the %15 is indeed a clever solution.

depends on if they’re from America or not. In much of the rest of the world they use the DD/MM/YYYY format.