added timestamp to apidocs template

extensions/apidoc/templates/bootstrap/layouts/main.php

@@ -60,7 +60,8 @@ $this->beginPage();
 
 <footer class="footer">
 	<?php /* <p class="pull-left">&copy; My Company <?= date('Y') ?></p> */ ?>
-	<p class="pull-right"><?= Yii::powered() ?></p>
+	<p class="pull-right"><small>Page generated on <?= date('r') ?></small></p>
+	<?= Yii::powered() ?>
 </footer>
 
 <?php $this->endBody() ?>