title: strtotime - a second before midnight
body: <p>I attempted this:</p>
  
  <pre><code>$date_string = strtotime('6 Mar, 2011 23:59:59');
  </code></pre>
  
  <p>But I think PHP can't interpret that for some reason as it returned empty. I tried this:</p>
  
  <pre><code>$date_string = strtotime('6 Mar, 2011 midnight');
  </code></pre>
  
  <p>The above worked but I need it to be a second before midnight i.e. the last second of the day. How can I get strtotime to return this without changing the 6 Mar, 2011 part?</p>