title: How to get the first day of the current year?
body: <p>I need to use PHP DateTime to get the first day of the current year. I've tried:</p>
  
  <pre><code>$year = new DateTime('first day of this year');
  var_dump($year);
  </code></pre>
  
  <p>But this seems to be returning the first day of the current month: <strong>2014-09-01 09:28:56</strong></p>
  
  <p>Why? How do I correctly get the first day of the current year?</p>