just replace code
(// we truely have a doublepost, now check if the merged post still fits the rules!)
...
...
Code:
$doublepost['message'] = $doublepost['pagetext'] . "\n" . $vbulletin->options['xen_dp_spacer'] . "\n" . $post['message'];
with
Code:
$doublepost['message'] = $doublepost['pagetext'] . "\n[SIZE=\"1\"][COLOR=\"DarkSlateGray\"]" . '-----Added '.date("j/n/Y"). ' at '.Date("h : i : s").'-----'.$vbulletin->options['xen_dp_spacer'] . "[/color][/size]\n" . $post['message'];