title: Convert character month name to date time object
body: <p>I must be missing something simple. </p>
  
  <p>I have a data.frame of various date formats and I'm using lubridate which works great with everything except <strong><em>month names by themselves</em></strong>. I can't get the month names to convert to date time objects.</p>
  
  <pre><code>&gt; head(dates)
      From         To
  1       June     August
  2    January   December
  3 05/01/2013 10/30/2013
  4       July   November
  5 06/17/2013 10/14/2013
  6 05/04/2013 11/23/2013
  </code></pre>
  
  <p>Trying to change June into date time object:</p>
  
  <pre><code>&gt; as_date(dates[1,1])
  Error in charToDate(x) : 
    character string is not in a standard unambiguous format
  
  &gt; as_date("June")
  Error in charToDate(x) : 
    character string is not in a standard unambiguous format
  </code></pre>
  
  <ul>
  <li>The actual year and day do not matter. I only need the month. zx8754 suggested using dummy day and year.</li>
  </ul>