The best way would be to use a server side script that would compare the entered date to the current date, or to the calculated acceptable date.
Thanks - could you point me to a knowledgebase url or support url?
anybody know where an very simple guide or example is posted? thanks
Which server-side programming languages do you know? If you're good with PHP, this link might help.
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I know no programming languages. I'm learning this as I'm doing it.