[190] Query String Parameters

FYI, the checker for problem 190 can send invalid values such as year=1995&month=9&day=31.

That is 1995-09-31 and doesn't exist. Since handling of such values wasn't specified, the results should be considered undefined ("garbage in = garbage out", and not a valid check). Some software could (correctly) either reject this or "normalize" it to 1995-10-01.