title: Javascript - reformat date string to ISO8601
body: <p>I have a string like this:</p>
  
  <pre><code>21.03.2016 23:59
  </code></pre>
  
  <p>And I need this string converted into a ISO-8601 date-time string:</p>
  
  <pre><code>YYYY-MM-DDTHH:mm:ss+00:00
  </code></pre>
  
  <p>Is there a simple way to convert this date?
  I try it whit moment.js but i can't find a function to parse an existing date.</p>