The photoApp plugin uses the HTML time tags <time> datetime="2014-04-23" /></time> that is the placed as the sibling of each image <img src="img/img1_thumb.jpg" /> and provides sorting feature bases on day, month and year.
If you don't want the plugin to sort the photos when the page load, set this option to false: sortOnLoad: false;. If you don't want to have the sorting feature activated at all, set this option to false as well: activateSort: false;. In this case, the buttons related to sorting will be taken out of the page.
false;
<head>
<!-- photoApp stylesheet -->
<link rel="stylesheet" href="css/normalize.css" />
<link rel="stylesheet" href="css/photoApp.css" />
<!-- minified jquery & photoApp plugin script -->
<script src="js/jquery.min.js"></script>
<script src="js/jquery.photoApp.js"></script>
<script>
$(document).ready(function() {
$("#photoCollection").photoApp();
});
</script>
</head>
<!-- For the demo, each photo's original size is 1680 x 1050 pixels -->
<!-- For the demo, each thumbnail's original size is 370 x 231 pixels -->
<div id="photoCollection">
<div data-src="img/img1.jpg">
<img src="img/img1_thumb.jpg" />
<time datetime="2014-04-23"></time>
</div>
<div data-src="img/img2.jpg">
<img src="img/img2_thumb.jpg" />
<time datetime="2013-04-12"></time>
</div>
<div data-src="img/img3.jpg">
<img src="img/img3_thumb.jpg" />
<time datetime="2013-01-26"></time>
</div>
</div>