title: getting minutes difference between two Time::Piece objects
body: <p>I have the code:</p>
  
  <pre><code>use Time::Piece;
  use Time::Seconds;
  
  my $timespan = $latest_time - $timestamp;
  
  print $latest_time . "\n";
  print $timestamp . "\n";
  print $timespan-&gt;minutes;
  </code></pre>
  
  <p>where $latest_time = Time::Piece->new; and $timestamp = Time::Piece->strptime();</p>
  
  <p>and I get the results:</p>
  
  <pre><code>Thu Mar 27 09:40:19 2014
  Thu Mar 27 09:40:00 2014
  -479.683333333333
  </code></pre>
  
  <p>What went wrong? there should be 0 minutes for $timespan, correct? Where is -479 coming from?</p>