title: Why is "Expires" 1981?
body: <p>My CRON Job returned an error that CRON job did not work. In that this was there:</p>
  
  <pre class="lang-none prettyprint-override"><code>Set-Cookie: PHPSESSID=2t2drultihqci4em15nbfmeb63; path=/
  Expires: Thu, 19 Nov 1981 08:52:00 GMT
  Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
  Pragma: no-cache
  Content-type: text/html
  </code></pre>
  
  <p>I am wondering why is <code>Expires</code> set to "1981". What is the significance?</p>