This is a quick script for comparing start and end dates and ensuring that the end date is larger than the start date.
Type the following script in the Custom HTML element in your form and amend the form field name accordingly. Our example below shows a reading from the fields "start_date" and "end_date".
<script type="text/javascript">
$('form').submit(function(){
startDate = $("input[name='start_date']").val();
endDate = $("input[name='end_date']").val();
if( endDate < startDate ){
alert("End Date must be larger than the Start Date. Please try again.");
return false;
}else{
return true;
}
});
</script>