title: how to set time zone for mongoid
body: <p>I am using mongoid for my rails app.</p>
  
  <p>I want to set time zone for mongoid.</p>
  
  <p>I tried with this in application.rb</p>
  
  <pre><code>config.mongoid.time_zone  = 'Kolkata'
  </code></pre>
  
  <p>but no luck. I also tried with this</p>
  
  <pre><code>use_utc: false
  use_activesupport_time_zone: true
  </code></pre>
  
  <p>still it uses default time zone UTC.</p>
  
  <p>rails 3.0.10</p>
  
  <p>mongoid 2.2.4</p>
  
  <p>please help.</p>
  
  <p>thanks in advance.</p>