title: which timezone is used by DateUtils?
body: <p>I'm trying to use <code>DateUtils</code> from <code>apache-commons3</code>, but can't understand which timezone it relies on:</p>
  
  <pre><code>Date date = DateUtils.truncate(date, Calendar.DATE);
  </code></pre>
  
  <p>How does it know which timezone I'm in?</p>