title: How to subtract 4 months from today's date?
body: <p>I need to declare two dates in <code>"Ymd"</code> format: <code>$toDate</code> and <code>$fromDate</code>.</p>
  
  <p><code>$toDate</code> represents today's date and <code>$fromDate</code> needs to be 4 months earlier than today.</p>
  
  <pre><code>$toDate = Date('Ymd');
  $fromDate = ?
  </code></pre>
  
  <p>How do I create <code>$fromDate</code>?</p>