monotonic_time() :: integer()

monotonic_to_date_time(
  integer(),
  :native | System.time_unit(),
  Calendar.calendar()
) ::
  {:ok, DateTime.t()} | {:error, atom()}

monotonic_to_date_time!(
  integer(),
  :native | System.time_unit(),
  Calendar.calendar()
) ::
  DateTime.t()

monotonic_unit() :: :microsecond