How Do I Display The "Last Updated" Day/Time

<?php
$ar_tv = $modx->getTemplateVar('UpdatedOn');

if ($ar_tv['value'] == 1) {
 $updated = $modx->documentObject['editedon'];
 $u = strftime("%B %e, %Y",$updated);
 $output = "<div id='updated_on'>Last updated on ".$u."</div>";
}

return $output;
?>

<?php
/*
::::::::::::::::::::::::::::::::::::::::
 Snippet name: LastCreation
 Short Desc: Lists the time from the last creation of a document
 Version: 1.0.0
 Author: Jesse Rochman (Jesster444)
	
 Date: March 7, 2007
 
 Example Usage:
 
 [!LastCreation!] - Outputs the the time in xx Days xx Hours xx Minutes.  It will return the time of creation for the last document created, regardless of published status.
 [!LastCreation? &lcPublished=`1` &lcParent=`10`!] - Outputs the time of creation for the last published document created that is a child of document 10.
 
 Parameters:
 &lcPublished: (0|1)
If set to 0 it will output the time for the last creation of an unpublished document, if set to 1 it will output the time for the last creation of a published document.

&lcParent:
The parent ID of the folder you want to look in for last creation times.  Can be used in conjuction with $lcPublished.
 
::::::::::::::::::::::::::::::::::::::::
*/

if (isset($lcPublished) && $lcPublished < 2) {
	$SQL = "published=$lcPublished";
	}
	else $SQL = '';

if (isset($lcParent) && $SQL) {
	$SQL .= " AND parent=$lcParent";
	}
	elseif (isset($lcParent) && !$SQL) {
	$SQL = "parent=$lcParent";
	}


$table = $modx->getFullTableName("site_content");

$results = $modx->db->select("createdon", $table, "$SQL", "createdon DESC", "1");

$results = $modx->db->getRow($results);


$createdon = $results['createdon'];

if ($createdon) {
	$now = time();
	$diff = $now - $createdon;
	$days = floor($diff/86400);
	$hours = floor($diff/3600);
	$minutes = floor($diff/60);


	if ($days > 0) {
		if ($days == 1) $output = $days . ' day ';    
		else $output = $days . ' days ';

		$diff = $diff - ($days * 86400);
		$hours = floor($diff/3600);

	} 
	if ($hours > 0) {
		if ($hours == 1) $output .= $hours . ' hour ';
		else $output .= $hours . ' hours ';
	
		$diff = $diff - ($hours * 3600);
		$minutes = floor($diff/60);
	}
	else $minutes = floor($diff/60);
	if ($minutes >0) {
		if ($minutes == 1) $output .= $minutes . ' minute';
		else $output .= $minutes . ' minutes';
	}

	return $output;
}
else return '';
?>