code: def get_best_local_timezone():
      
      zone_name = tzlocal.get_localzone().zone
      if zone_name in pytz.all_timezones:
          return zone_name
      if time.daylight:
          local_offset = time.altzone
          localtz = time.tzname[1]
      else:
          local_offset = time.timezone
          localtz = time.tzname[0]
      local_offset = datetime.timedelta(seconds=-local_offset)
      for zone_name in pytz.all_timezones:
          timezone = pytz.timezone(zone_name)
          if not hasattr(timezone, '_tzinfos'):
              continue
          for utcoffset, daylight, tzname in timezone._tzinfos:
              if utcoffset == local_offset and tzname == localtz:
                  return zone_name
docs: Compares local timezone offset to pytz's timezone db, to determine
      a matching timezone name to use when TIME_ZONE is not set.