title: How to update hour, min, sec in golang time?
body: <p>Ex: How can I update hour in <code>t</code> time?</p>
  
  <pre><code>fmt.Println(t)
  //=&gt; 2006-01-02 15:04:05 +0000 UTC
  </code></pre>
  
  <p>Expect to get: <code>2006-01-02 00:00:00 +0000 UTC</code></p>
  
  <p>Edited: similar to: <a href="https://stackoverflow.com/questions/36988681/time-time-round-to-day">time.Time Round to Day</a></p>