Description:
------------
If I have the prepared SQL statement INSERT INTO WEBLIB.justin(recieved_date) VALUES(?), where recieved_date is a timestamp, I cannot pass a DateTime object into it. I can however, pass it if I format it with ->format('Y-m-d H:i:s'), which is the native DB2 format. I think the driver should handle the casting from dateTime on its own.

Test script:
---------------
CREATE TABLE WEBLIB.JUSTIN(
  id INT NOT NULL
    GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1)
    CONSTRAINT WEBLIB.PK_JUSTIN PRIMARY KEY,
  recieved_date TIMESTAMP NOT NULL
);

<?php
$cn = db2_connect('', '', '');

$sql = "INSERT INTO WEBLIB.justin(recieved_date) VALUES(?);";
$stmt = db2_prepare($cn, $sql);
#this line will work
db2_execute($stmt, [(new DateTime('1981-04-28'))->format('Y-m-d H:i:s')]);
# This line does not work
db2_execute($stmt, [new DateTime('2001-09-11')]);

db2_close($cn);
?>