How to set date conditions on PDF?

Assuming the date fields are formatted as mm/dd/yyyy, enter the following custom validation script into the Original Exam Date field:

if(event.value && util.scand("mm/dd/yyyy", event.value)> new Date())
{
app.alert("Date must be before today.",1)
event.value="";
}

Enter the following custom validation script into the proposed exam date:

if(event.value && util.scand("mm/dd/yyyy", event.value)<= new Date())
{
app.alert("Date must be after today.",1)
event.value="";
}