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Cocktail is a date/time recurrence library for Elixir based on iCalendar events. It can generate a stream of dates/times based on a set of repeat rules.

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cocktail lib cocktail validation hour_of_day.ex
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lib/cocktail/validation/hour_of_day.ex 

defmodule Cocktail.Validation.HourOfDay do

  @moduledoc false



  import Integer, only: [mod: 2]

  import Cocktail.Validation.Shift

  import Cocktail.Util, only: [next_gte: 2]



  @type t :: %__MODULE__{hours: [Cocktail.hour_number()]}



  @enforce_keys [:hours]

  defstruct hours: []



  @spec new([Cocktail.hour_number()]) :: t

  def new(hours), do: %__MODULE__{hours: Enum.sort(hours)}



  @spec next_time(t, Cocktail.time(), Cocktail.time()) :: Cocktail.Validation.Shift.result()

  def next_time(%__MODULE__{hours: hours}, time, _) do

    current_hour = time.hour

    hour = next_gte(hours, current_hour) || hd(hours)

    diff = (hour - current_hour) |> mod(24)



    shift_by(diff, :hours, time, :beginning_of_hour)

  end

end