Ruby on Rails

I don't know if timezone really works in rails.
In my rails 3 application.rb file I have:

config.time_zone = 'Rome'
config.i18n.default_locale = :it
config.encoding = "utf-8"

My database is postgres.
I've created some migrations and put some records.
The time in created_at and updated_at fields is 2 hours back.
Why?

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