title: Version difference for strtotime('first day of last month')?
body: <p>In a script that contains </p>
  
  <pre><code>date('Y-m-d', strtotime('first day of last month'))
  </code></pre>
  
  <p>in version 5.3.10 (localhost) I get, for example, '2012-03-01'.</p>
  
  <p>in version 5.2.17 (remote host) I get '1969-12-31'.</p>
  
  <p>Is there an expression that will return expected (e.g., '2012-03-01') results for both versions?</p>