Example: first we set day
to 30. All is well. Next we set month
to 2. All is still well, except that the 30th of February isn't valid.
Let's do it the other way around: currently the month is set to 2. We try to set day to 30, but the system won't allow it, because the 30th of February isn't valid. We were going to set the month later, you bozo system!
Lesson to be learned: don't let the system do your thinking.
I don't like overzealous range testing for each individual field, in this example because the ranges themselves are interdependent. Having a get/set interface won't help one single bit.
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