Packages

quantum

3.0.1
3.5.3 3.5.2 retired 3.5.1 retired 3.5.0 3.4.0 3.3.0 3.2.0 3.1.0 3.0.2 3.0.1 3.0.0 3.0.0-rc.3 3.0.0-rc.2 3.0.0-rc.1 2.4.0 2.3.4 2.3.3 2.3.2 2.3.1 retired 2.3.0 retired 2.2.7 2.2.6 2.2.5 retired 2.2.4 retired 2.2.3 retired 2.2.2 retired 2.2.1 retired 2.2.0 retired 2.1.3 retired 2.1.2 retired 2.1.1 retired 2.1.0 retired 2.1.0-beta.1 retired 2.0.4 retired 2.0.3 retired 2.0.2 retired 2.0.1 retired 2.0.0 retired 2.0.0-beta.2 retired 2.0.0-beta.1 retired 1.9.3 retired 1.9.2 retired 1.9.1 retired 1.9.0 retired 1.8.1 retired 1.8.0 retired 1.7.1 retired 1.7.0 retired 1.6.1 retired 1.6.0 retired 1.5.0 retired 1.4.0 retired 1.3.2 retired 1.3.1 retired 1.3.0 retired 1.2.4 retired 1.2.3 retired 1.2.2 retired 1.2.1 retired 1.2.0 retired 1.1.0 retired 1.0.4 retired 1.0.3 retired 1.0.2 retired 1.0.1 retired 1.0.0 retired

Cron-like job scheduler for Elixir.

HexDocs

Current section

Files

Jump to
Readme
66 Versions
2 Dependencies
Dependants
Files
Activity
quantum lib quantum date_library.ex
Raw

lib/quantum/date_library.ex 

defmodule Quantum.DateLibrary do

  @moduledoc false



  require Logger



  alias Quantum.DateLibrary.{InvalidDateTimeForTimezoneError, InvalidTimezoneError}



  # Convert Date to Utc

  @spec to_utc!(NaiveDateTime.t(), :utc | String.t()) :: NaiveDateTime.t()



  def to_utc!(date, :utc), do: date



  def to_utc!(date, tz) when is_binary(tz) do

    dt =

      case DateTime.from_naive(date, tz) do

        {:ok, dt} ->

          dt



        {:ambiguous, _, _} ->

          raise InvalidDateTimeForTimezoneError



        {:gap, _, _} ->

          raise InvalidDateTimeForTimezoneError



        {:error, :incompatible_calendars} ->

          raise InvalidDateTimeForTimezoneError



        {:error, :time_zone_not_found} ->

          raise InvalidTimezoneError



        {:error, :utc_only_time_zone_database} ->

          Logger.warn("Timezone database not setup")

          raise InvalidTimezoneError

      end



    case DateTime.shift_zone(dt, "Etc/UTC") do

      {:ok, dt} ->

        DateTime.to_naive(dt)



      {:error, :utc_only_time_zone_database} ->

        Logger.warn("Timezone database not setup")

        raise InvalidTimezoneError

    end

  end



  # Convert Date to TZ

  @spec to_tz!(NaiveDateTime.t(), :utc | String.t()) :: NaiveDateTime.t()

  def to_tz!(date, :utc), do: date



  def to_tz!(date, tz) when is_binary(tz) do

    result =

      date

      |> DateTime.from_naive!("Etc/UTC")

      |> DateTime.shift_zone(tz)



    case result do

      {:ok, dt} ->

        DateTime.to_naive(dt)



      {:error, :time_zone_not_found} ->

        raise InvalidTimezoneError



      {:error, :utc_only_time_zone_database} ->

        Logger.warn("Timezone database not setup")

        raise InvalidTimezoneError

    end

  end



  defmodule InvalidDateTimeForTimezoneError do

    @moduledoc false



    defexception message: "The requested time does not exist in the given timezone."

  end



  defmodule InvalidTimezoneError do

    @moduledoc false



    defexception message: "The requested timezone is invalid."

  end

end