Could this be anything maybe?
PHP Code:
// get last reply time
if ($postid) {
$dateline=$DB_site->query_first("SELECT dateline
FROM post
WHERE postid='$postid'");
$lastposttime=$DB_site->query_first("SELECT dateline
FROM post
WHERE threadid = '$threadid'
AND dateline < $dateline[dateline]
AND visible = 1
ORDER BY dateline DESC
LIMIT 1");
} else {
$lastposttime=$DB_site->query_first("SELECT dateline
FROM post
WHERE threadid='$threadid'
ORDER BY dateline DESC
LIMIT 1");
}