title: DateTime in ISO 8601 + TimeZone and without microseconds
body: <p>I need date-time string in ISO 8601 without any microseconds. </p>
  
  <p>Like:</p>
  
  <pre><code>2015-01-05T11:26:00-03:00
  </code></pre>
  
  <p>I use:</p>
  
  <pre><code>from pytz import timezone
  from datetime import datetime
  timezone(settings.TIME_ZONE).localize(datetime.now()).isoformat()
  </code></pre>
  
  <p>But it returns:</p>
  
  <pre><code>'2015-01-28T17:49:39.711725-03:00'
  </code></pre>
  
  <p>How to fix that?</p>