title: How to convert unix timestamp to calendar date moment.js
body: <p>I have a unix timestamp, and I'm trying to convert it into a calendar date such as <code>MM/DD/YYYY</code>. 
  So far, I have this:</p>
  
  <pre class="lang-js prettyprint-override"><code>$(document).ready(function() {
    var value = $("#unixtime").val(); //this retrieves the unix timestamp
    var dateString = moment(value).calendar(); 
    alert(dateString);
  });
  </code></pre>
  
  <p>When I try to print out the calendar date, the window says "Invalid date". Can anyone help me out? </p>