code: def process_request(self, request):
          
  
          if not request:
              return
  
          if not db_loaded:
              load_db()
  
          tz = request.session.get('django_timezone')
  
          if not tz:
              # use the default timezone (settings.TIME_ZONE) for localhost
              tz = timezone.get_default_timezone()
  
              client_ip = get_ip_address_from_request(request)
              ip_addrs = client_ip.split(',')
              for ip in ip_addrs:
                  if is_valid_ip(ip) and not is_local_ip(ip):
                      if ':' in ip:
                          tz = db_v6.time_zone_by_addr(ip)
                          break
                      else:
                          tz = db.time_zone_by_addr(ip)
                          break
  
          if tz:
              timezone.activate(tz)
              request.session['django_timezone'] = str(tz)
              if getattr(settings, 'AUTH_USER_MODEL', None) and getattr(request, 'user', None):
                  detected_timezone.send(sender=get_user_model(), instance=request.user, timezone=tz)
          else:
              timezone.deactivate()
docs: If we can get a valid IP from the request,
          look up that address in the database to get the appropriate timezone
          and activate it.
  
          Else, use the default.