title: Convert from MM/DD/YYYY to DD-MM-YYY
body: <p>I have some data in csv file which has some entries in the MM/DD/YYYY format and some entries in the DD-MM-YYYY format. I would like to read this column of entries and store it as a new column in a pandas dataframe? How would I go about this? </p>
  
  <p>Example:</p>
  
  <pre><code>    Entry        Sampling Date
       1            01-10-2004
       2            01-13-2004
       3            16/1/2004
  </code></pre>
  
  <p>I would like to convert the first two rows' date format to that in the third row. </p>