code: def monday_of_week(year, week):
      
      str_time = time.strptime('{0} {1} 1'.format(year, week), '%Y %W %w')
      date = timezone.datetime(year=str_time.tm_year, month=str_time.tm_mon,
                               day=str_time.tm_mday, tzinfo=timezone.utc)
      if timezone.datetime(year, 1, 4).isoweekday() > 4:
          # ISO 8601 where week 1 is the first week that has at least 4 days in
          # the current year
          date -= timezone.timedelta(days=7)
      return date
docs: Returns a datetime for the monday of the given week of the given year.