JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://datejs.googlecode.com/files/date.js"></script>
<div class="timestamp">2014-08-25 22:00:34 GMT</div>
<a href="#" target="_blank">Test</a>

JavaScript

jQuery.fn.extend({ 
    test: function(format) {
     return this.each(function(i, e) {
         var txt = $(e).html();
         //var date = new Date(txt);
         //$(e).html ( date.format(format) );
         var d1 = Date.parse(txt);
         
         $(e).html(d1.toString('yyyy-MM-dd hh:mm:ss'));
         //$(e).html (date.toString(''));
         //$(e).html ( date.toISOString().substr(0, 19).replace('T', ' ') );
    });    
  }
});


$(function() {
    
    alert('test');
    //var txt = $('.timestamp').html();
    
    //var date = new Date(txt);
    //alert(date.getDate() +'-' + date.getMonth() + '-' + date.getFullYear() + ' ' + date.getHours() + ':' +  date.getMinutes() + ':' + date.getSeconds()  );
    
    $('.timestamp').test('yyyy/mm/dd hh:mm:ss');
    
});