title: What are the numbers dispalyed next to author from for-each-ref
body: <p>So I have been trying to use the --format option in the for-each-ref command, and when I run this command:</p>
  
  <pre><code>git for-each-ref --format='%(author)'
  </code></pre>
  
  <p>I get this output:</p>
  
  <pre><code>Pat McGroin &lt;McGrion.Pat@example.com&gt; 1529175479 -0600
  </code></pre>
  
  <p>What are those numbers at the end? What do they represent?</p>