title: Check date is within one year python
body: <p>I have a date string formatted like this: <code>"2017-05-31T06:44:13Z"</code>.</p>
  
  <p>I need to check whether this date is within a one year span from today's date. </p>
  
  <p>Which is the best method to do it: convert it into a timestamp and check, or convert into a date format?</p>