title: Parse ISO date with older GNU coreutils
body: <p>I am parsing a date as below:</p>
  
  <pre><code>date +'%Y-%m-%dT%H:%M:%SZ' -d '2017-10-06T13:41:06Z'
  </code></pre>
  
  <p>It works fine with date version <em>(GNU coreutils) 8.21</em> but it is not working for date version <em>(GNU coreutils) 8.4</em>. Giving following error:</p>
  
  <blockquote>
    <p>date: invalid date `2017-10-06T13:41:06Z'</p>
  </blockquote>
  
  <p>Is there a way to parse this date in <em>(GNU coreutils) 8.4</em> ?</p>