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time_zone_info

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Time zone support for Elixir by using the IANA tz database.

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time_zone_info lib time_zone_info iso_days.ex
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lib/time_zone_info/iso_days.ex 

defmodule TimeZoneInfo.IsoDays do

  @moduledoc false



  # A module to handle ISO days.



  import Calendar.ISO, only: [naive_datetime_from_iso_days: 1]



  @seconds_per_day 24 * 60 * 60

  @microseconds_per_second 1_000_000

  @parts_per_day @seconds_per_day * @microseconds_per_second



  @doc """

  Converts an ISO day to gregorian seconds.

  """

  @spec to_gregorian_seconds(Calendar.iso_days()) :: TimeZoneInfo.gregorian_seconds()

  def to_gregorian_seconds({days, {parts_in_day, @parts_per_day}}) do

    div(days * @parts_per_day + parts_in_day, @microseconds_per_second)

  end



  @doc """

  Converts an ISO day to year.

  """

  @spec to_year(Calendar.iso_days()) :: Calendar.year()

  def to_year(iso_days) do

    iso_days |> naive_datetime_from_iso_days() |> elem(0)

  end

end