Limit Opening Submission Form

[NeedHelp]

I want to create a submission form that does not allow someone to fill out the form if today's date is more than 30 days before a certain date (field = Event Date)....and a message pops up that says "It's too early to submit your request". Is there a way to test for this?

[MayMusic]

You add the code below to the Footer of your submission page

<script>
document.getElementById("Submit").onmouseover = function (){
alert('[@cbTimestamp*]' ); 
alert('[@date]');
if ('[@cbTimestamp*]' > '[@date]'){
alert('Too early to submit your request');
return false;
}
}
</script>

This is a submission page which is receiving "date" as parameter from previous page which is Event Date.