docs: def epiweek_to_date(ew: Epiweek) -> datetime.date:
      """
      Return date from epiweek (starts at Sunday)
      """
  
      day_one = _start_date_of_year(ew.year)
      diff = 7 * (ew.week - 1) + (ew.day - 1)
  
      return day_one + datetime.timedelta(days=diff)