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Use Toolshed for more IEx helpers

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toolshed lib toolshed date.ex
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lib/toolshed/date.ex 

defmodule Toolshed.Date do

  @moduledoc """

  This module  replicate `date` unix command and its options.

  """



  @doc """

  Return the date and time in UTC

  """

  @spec date() :: String.t()

  def date() do

    date_in_unix_format(DateTime.utc_now())

  end



  defp weekday_text(date_time) do

    date_time

    |> DateTime.to_date()

    |> Date.day_of_week()

    |> weekday()

  end



  defp weekday(day_in_number) do

    elem({"", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}, day_in_number)

  end



  defp month_text(date_time) do

    elem(

      {"", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"},

      date_time.month

    )

  end



  defp time_text(date_time) do

    date_time

    |> DateTime.to_time()

    |> Time.truncate(:second)

    |> Time.to_string()

  end



  defp format_date(date) when date > 9, do: date

  defp format_date(date), do: " #{date}"



  defp date_in_unix_format(date_time) do

    "#{weekday_text(date_time)} #{month_text(date_time)} #{format_date(date_time.day)} #{time_text(date_time)} UTC #{date_time.year}"

  end

end