title: Bash -1 year from date
body: <pre><code>Year=`date '+%Y'`
  RTRN1=$?
  </code></pre>
  
  <p>This returns the current date in the logs, however i want to return the year before, so instead of this returning 2017 i want 2016.</p>
  
  <p>Any help appreciated! Thanks</p>