title: How to convert dataframe column with datetime value to ISO-8601 time format with timezone?
body: <p><strong>How can I convert all dataframe column value to ISO-8601 format</strong></p>
  
  <p><em>Given below the sample value I get, when I execute <code>print(df['timestamp'])</code> for reference</em></p>
  
  <p>0 2020-02-03 18:00:33 <br/>
  1 2020-02-03 18:00:37 <br/>
  2 2020-02-03 18:00:39 <br/>
  3 2020-02-03 18:01:16 <br/>
  4 2020-02-03 18:01:17 <br/>
  5 2020-02-03 18:02:14 <br/>
  6 2020-02-03 18:02:46 <br/>
  7 2020-02-03 18:02:50 <br/>
  8 2020-02-03 18:02:58</p>
  
  <p><em>Given below the</em> <strong>Expected Result</strong></p>
  
  <p>0 2020-02-03T18:00:33-06 <br/>
  1 2020-02-03T18:00:37-06 <br/>
  2 2020-02-03T18:00:39-06 <br/>
  3 2020-02-03T18:01:16-06 <br/>
  4 2020-02-03T18:01:17-06 <br/>
  5 2020-02-03T18:02:14-06 <br/>
  6 2020-02-03T18:02:46-06 <br/>
  7 2020-02-03T18:02:50-06 <br/>
  8 2020-02-03T18:02:58-06 <br/></p>