BjRo

defmodule Messages.Time do
  use Timex

  @spec timestamp() :: Timex.DateTime.t
  def timestamp, do: Timex.DateTime.now(:utc)

  @type ts :: Timex.Convertable.t | none
  @spec timestamp_iso8601(ts) :: binary
  def timestamp_iso8601(ts \\ __MODULE__.timestamp) do
    {:ok, iso8601} = Timex.format(ts, "{ISO:Extended}")

BjRo

defmodule Test do
  defmacro __using__(opts) do
    quote do
      import unquote(__MODULE__), only: [map_test: 0]
    end
  end

  #works as expected
  defmacro map_test do
    bar = [foo: "bar"]