title: Bug: Lumen using local time while save timestamp record
body: <p>In Lumen 5.3, I use default timezone (UTC), and when I using:</p>
  
  <pre><code>echo date('Y-m-d H:i:s')
  </code></pre>
  
  <p>It show the UTC timezone</p>
  
  <p>but when I save a new record with timestamps, it save my local time zone.</p>
  
  <p>Example: My timezone is +07:00, and the local time is 11h00.
  When using: <code>echo date('Y-m-d H:i:s')</code>, it is show <code>2018-12-27 04:00:00</code>, but when I save new record, the created_at field is <code>2018-12-27 11:00:00</code>. The value I want to save is: <code>2018-12-27 04:00:00</code></p>
  
  <p>How can I fix it, please help me. thank you.</p>