Two Digit School Year (e.g., "17-18")

two-digit-school-year.ex

defmodule SchoolYear do
  # "17-18"
  def get_two_digit_school_year do
    [DateTime.utc_now.year, DateTime.utc_now.year + 1] # calendar years
    |> Enum.map(
      (fn (calendar_year) -> Integer.digits(calendar_year)
      |> Enum.slice(2, 2)
      |> Enum.join end)
    )
    |> Enum.join("-")
  end
end