Run a task periodically natively in Elixir

periodic_task.ex

defmodule MyApp.Periodically do
  use GenServer

  def start_link do
    GenServer.start_link(__MODULE__, %{})
  end

  def init(state) do
    Process.send_after(self(), :work, 2 * 60 * 60 * 1000) # In 2 hours
    {:ok, state}
  end

  def handle_info(:work, state) do
    # Do the work you desire here

    # Start the timer again
    Process.send_after(self(), :work, 2 * 60 * 60 * 1000) # In 2 hours

    {:noreply, state}
  end
end

# In the supervision tree:

worker(MyApp.Periodically, [])