Confusion in Rails TimeZone

My config for timezones looks like this

config.time_zone = 'Pacific Time (US & Canada)'
  config.active_record.default_timezone = 'Pacific Time (US & Canada)'

When I query for created_at of an Object it returns me a value like this

2.1.5 :070 > b.created_at
 => Tue, 07 Apr 2015 20:49:58 PDT -07:00 

The DateTime value at the time of creation of the object was like this

2.1.5 :071 > DateTime.now
 => Wed, 08 Apr 2015 03:49:58 -0700 

Which means the value I was getting for the created_at field was 7 hours behind PDT.I cannot understand why this happens.Is this because of any mistakes in my configs.