core/modules/form/model/SubmissionModel.php
<?php
class SubmissionModel extends Ajde_Model
{
protected $_autoloadParents = true;
protected $_displayField = 'id';
protected $_jsonFields = ['entry'];
public function displayAgo()
{
$timestamp = new DateTime($this->get('added'));
$timestamp = $timestamp->format('U');
return Ajde_Component_String::time2str($timestamp);
}
}