No date validity checking in UI

[scj1091]

SelectOptions only generates lists of months and dates, it doesn't inject any js to verify that the resulting date combos are correct. E.g., the user could pick February 30 or September 31 and would only be notified that the date is invalid on submit (or would they? is Cake checking that datetimes are valid?). Relying on the user to double-check his data is a Bad Idea ™