There’s a bug in my little code snippet – I wrote $postid instead of $poi->postid, so it always prints the first date. I didn’t realize the dates were repeating when I tried it.
It should be as shown below. I tested it and it looked OK. Hopefully it’ll work for you as well:
<td>
<?php
if ($poi->postid) {
$p = get_post($poi->postid);
echo $p->post_date;
}
?>
</td>