title: ValueError: day is out of range for month
body: <p>I want to convert a string from a dataframe to datetime.</p>
  
  <pre><code>dfx = df.ix[:,'a']
  dfx = pd.to_datetime(dfx)
  </code></pre>
  
  <p>But it gives the following error:</p>
  
  <blockquote>
    <p>ValueError: day is out of range for month</p>
  </blockquote>
  
  <p>Can anyone help? </p>