title: Curl says Certificate has expired (10) but expire date is in the future
body: <p>on our domain (upfit.de), the certificate expires on the 13th of december 2021 and the certificate is valid from the outside (checked on sslchecker, in the browser, etc...).<br />
  On the server that hosts this domain, when I <code>curl -vvI https://upfit.de</code>, I get the following message:</p>
  <pre><code>* Server certificate:
  *  subject: CN=upfit.de
  *  start date: Sep 14 02:32:37 2021 GMT
  *  expire date: Dec 13 02:32:36 2021 GMT
  *  issuer: C=US; O=Let's Encrypt; CN=R3
  *  SSL certificate verify result: certificate has expired (10), continuing anyway.
  </code></pre>
  <p>You have to agree that the message is a bit odd, it states that the certificate expired, but its expire date is on the 13th of December.<br />
  Any idea?</p>