Default datetime with Ecto & Elixir

I've just started working Elixir & Phoenix today, i am trying to add Ecto as a mapper, but i'm having some trouble using time. This is my model. schema "users" do field :name, :string field :email, :string field :created_at, :datetime, default: Ecto.DateTime.local field :updated_at, :datetime, default: Ecto.DateTime.local end I'm trying to set the created_at and updated_at per default, but when i