You could customize the file:
/includes/templates/template_default/templates/tpl_product_info_display.php
and using your templates and overrides, customize the code:
Code:
if ($flag_show_product_info_date_added == 1) {
?>
<p id="productDateAdded" class="productGeneral centeredContent"><?php echo sprintf(TEXT_DATE_ADDED, zen_date_long($products_date_added)); ?></p>
<?php
} // $flag_show_product_info_date_added
and change it by adding the code in RED:
Code:
if ($flag_show_product_info_date_added == 1) {
?>
<?
define('TEXT_DATE_MODIFIED', 'This product was last updated on %s');
$chk_date_added = zen_products_lookup((int)$_GET['products_id'], 'products_date_added');
$chk_date_modified = zen_products_lookup((int)$_GET['products_id'], 'products_last_modified');
if ($chk_date_modified <= $chk_date_added) {
?>
<p id="productDateAdded" class="productGeneral centeredContent"><?php echo sprintf(TEXT_DATE_ADDED, zen_date_long($products_date_added)); ?></p>
<?php } else { ?>
<p id="productDateAdded" class="productGeneral centeredContent"><?php echo sprintf(TEXT_DATE_MODIFIED, zen_date_long($chk_date_modified)); ?></p>
<?php } ?>
<?php
} // $flag_show_product_info_date_added
then change your language file, again using your templates and overrides for the DEFINE for TEXT_DATE_ADDED to alter the text on how it reads ...