title: Convert factor to POSIXct
body: <p>I have a date from a sql query that comes through as a factor and I would like to make it a POSIXct</p>
  
  <pre><code>f&lt;- as.factor("01/03/2014 20:59:30")
  f
  class(f)
  po&lt;-as.POSIXct(f)
  po
  </code></pre>
  
  <p>results</p>
  
  <pre><code>&gt; f&lt;- as.factor("01/03/2014 20:59:30")
  &gt; f
  [1] 01/03/2014 20:59:30
  Levels: 01/03/2014 20:59:30
  &gt; class(f)
  [1] "factor"
  &gt; po&lt;-as.POSIXct(f)
  &gt; po
  [1] "0001-03-20 LMT"
  </code></pre>
  
  <p>you can see  "0001-03-20 LMT"  is not correct.  Do you know how to convert this factor to a POSIXct?</p>
  
  <p>Thank you</p>