the MySQL Date Field expects the date to passed in the following format:
yyyy-mm-dd h:m:s
The date field in your form is not passing the date in that format.
to fix the problem, you can reformat the date that is passed, but first you will need to make note of the name of the date picker form element.
this example code will reformat the date passed by a date picker element named "datePicker"
<?php
if(isset($_POST['datePicker']) && $_POST['datePicker'] != "") {
$_POST['datePicker'] = date("Y-m-d h:m:s", strtotime($_POST['datePicker']);
}
?>
you can add that code to line one of the form page