title: What is a "circular argument reference" error, with activesupport time_zone?
body: <p>I'm new in ruby on rails, and I am trying to create a tutorial. I have a problem when I execute <code>rake db:migrate</code>.</p>
  
  <pre><code>hugo@ubuntu:~/pin_board$ rake db:migrate
  /home/hugo/.rvm/gems/ruby-2.2.2/gems/activesupport-4.0.5/lib/active_support/values/time_zone.rb:283: warning: circular argument reference - now
  </code></pre>
  
  <p>What causes this?<br>
  Can somebody help me? </p>