for the search reset, make sure the Clear Session server behavior code comes before the Data Assist Search code.
for the date search, the date stored in the database will be in the format:
you need to concert the date that is posted with the search to the same format:
<?php if(isset($_POST['dateField'])) $_POST['dateField'] = date("y-m-d" strtotime($_POST['dateField'])); ?>
with paypal standard the order information is stored when the checkout page posts to the confirm page, I dont like using paypal standard because of this, I recommend using express checkout instead.