defmodule MarcoPolo.Date do
  defstruct year: 0, month: 1, day: 1
end

defmodule MarcoPolo.DateTime do
  defstruct year: 0, month: 1, day: 1,
            hour: 0, min: 0, sec: 0, msec: 0
end

Add some builtin types like date and datetime
Add some builtin types like date and datetime

They're represented as structs (`MarcoPolo.Date` and `MarcoPolo.DateTime`).

MyMedsAndMe/marco_polo,linearregression/marco_polo