title: Mass date update using eloquent
body: <p>How to perform a bulk-update of multiple <code>Comment</code> records' publish dates with <strong>+1 week</strong> period? The illustration of the desired result:</p>
  
  <pre class="lang-php prettyprint-override"><code>$interval = CarbonInterval::week(); // 1 week interval, that needs to fit into below query
  Comment::where('id', '&gt;', 10)-&gt;update('publish_date', ...);
  </code></pre>