```ruby
class ChangeFormatToDateInActualites < ActiveRecord::Migration
  def change
    change_column :actualites, :date, :date
  end
end
```

Fix - migration for PG
user
```ruby
class ChangeFormatToDateInActualites < ActiveRecord::Migration
  def up
    remove_column :actualites, :date
    add_column :actualites, :date, :date
  end
  def down
    remove_column :actualites, :date
    add_column :actualites, :date, :string
  end
end
```
assistant