title: How to validate the expiration date of a self signed SSL certificate used for Kafka?
body: <p>I'm have a self signed certificate (and private key) in my possession.
  They are used for Kafka SSL authentication. 
  How can I know what is the validity (expiration) of my certificate ?  </p>
  
  <p>Iv'e tried looking on the instructions to create the certificate but couldn't find a good indication for an answer. 
  <a href="https://docs.confluent.io/current/tutorials/security_tutorial.html#generating-keys-certs" rel="nofollow noreferrer">https://docs.confluent.io/current/tutorials/security_tutorial.html#generating-keys-certs</a></p>