title: BASH - Delete files older than 3 months?
body: <p>Delete files older than 3 months how?</p>
  
  <p>For 90 days i know:</p>
  
  <pre><code>find /tmp/*.log -mtime +90 -type f -delete
  </code></pre>
  
  <p>But how do i know 3 months equal to always 90 days? how many exact days? Is there more better way to tell the <code>-mtime</code> to follow <code>months</code>?</p>