title: Convert DatetimeIndex to datetime.date in pandas
body: <p>I am trying to subtract today's date from a column in pandas to get the number of days(as an integer).</p>
  <p>I first converted the date's in column(ex: 27-Sep-2018) using <code>pd.to_datetime</code>.</p>
  <p><code>df['Date'] - datetime.datetime.now().date()</code></p>
  <p>I got the following error:</p>
  <p>TypeError: unsupported operand type(s) for -: 'DatetimeIndex' and 'datetime.date'</p>
  <p>I am trying to figure out how to get this to work, also converting the days to integer?</p>