Custom booking date placeholder for my-bookings.php template

/*
 * This custom booking date placeholder can be use in /templates/my-bookings.php template
 *
 */
add_filter('em_booking_output_placeholder','my_em_booking_date',1,3);
function my_em_booking_date($replacement, $EM_Booking, $result){
	global $wpdb;

	if ($result == '#_CUSTOMBOOKINGDATE') {
		$tablename = $wpdb->prefix.'em_bookings';
		$sql = $wpdb->prepare( "SELECT date_format(booking_date,'%%Y-%%m-%%d') as booking_date FROM $tablename WHERE booking_id = %d ", $EM_Booking->booking_id);
		$replacement = $wpdb->get_var($sql);
	}

	return $replacement;
}