Hi,
I have resolved the issue so please check and let me know your feedback.
Code Remarks-:
widget-comments.php at dante/swift-framework/widgets/
Find this code
$comment_date = get_comment_date('', $comment->comment_ID);
$comment_date = mysql2date('U', $comment_date);
Replace with
$comment_date = mysql2date('U', $comment->comment_date);
Thanks