title: Convert pandas dataframe with Timestamps to String
body: <p>Converting a pandas Series with Timestamps to strings is rather simple, e.g.:</p>
  
  <pre><code>dateSfromPandas = dfC['Date324'].dt.strftime('%Y/%m/%d')
  </code></pre>
  
  <p>But how do you convert a large pandas Dataframe with all columns being dates. The above does not work on:</p>
  
  <pre><code>dateSfromPandas = dfC.dt.strftime('%Y/%m/%d')
  </code></pre>