Rails 4 model returns always nil

Question

I am going crazy with the following error. I have a User class and two of its attributes (birthday & created_at => datetime) returns always nil besides it has a value on

Answer 1

I found the problem.

Some days ago I changed the config/application.rb file adding the following configuration to solve some issues with timezones:

config.time_zone and config.active_record.default_timezone

I've just removed them and all is working fine again.