title: strtotime 'this friday' and 'this sunday' not working
body: <p>I've been searching for a solution to this problem for a while.</p>
  
  <p>In my code I have</p>
  
  <pre><code>$start_date = date("Ymd", strtotime('this friday'));
  $end_date = date("Ymd", strtotime('this sunday'));
  </code></pre>
  
  <p>Yesterday (Sunday) I noticed that the output wasn't correct. It seems that the PHP starts the week on Sunday? I'd like to start it on Monday. So every week, from Monday to Sunday, start_date should output the friday of this week, and end_date should output the sunday of this week (that's why I've used 'this friday' and 'this sunday').</p>
  
  <p>Is this a timezone issue? If I add <code>date_default_timezone_set('Europe/Amsterdam');</code> above the code will it fix the problem?</p>
  
  <p>The thing is that I don't really know how to test this unless I wait untill it's Sunday again :-)</p>