function smarty_modifier_time_forum_format($string)
{
    $date_diff = time() - $string;
	
    if($date_diff < 3600) {
        return strftime('%M', smarty_make_timestamp($date_diff)) . 'min ';
    } else if($date_diff >= 3600 && $date_diff < 86400) {
         return strftime('%H', smarty_make_timestamp($date_diff)) . 't ';
    } else if($date_diff >= 86400) {
         return round($date_diff / 86400) . 'pv ';
    } else {
	return;
    }
}