```ruby
class AddTimeZoneToUser < ActiveRecord::Migration
  def change
    add_column :users, :time_zone, :string,
      null: false,
      default: "Central Time (US & Canada)"
  end
end
```

Adjust whitespace for mister @houndci
user
```ruby
class AddTimeZoneToUser < ActiveRecord::Migration
  def change
    add_column :users,
               :time_zone,
               :string,
               null: false,
               default: "Central Time (US & Canada)"
  end
end
```
assistant