title: Converting two columns of date and time data to one
body: <p>I have a simple data frame:</p>
  
  <pre><code>D &lt;- c("2012/12/14", "2012/12/14")
  Time &lt;- c("18:40:37", "18:40:48")
  df1 &lt;- data.frame(D, Time)
  </code></pre>
  
  <p>I wish to combine the two columns of date and time information into one, preferable in the format of day, month, year, time.</p>
  
  <p>How would I go about doing this?</p>