如何从Django中的查询集更改日期时间格式值？

Let's say I have this query:

假设我有这个问题:

getall = DataForecast.objects.all().values("date_time", "rainfall_mm_per_10_min", "wl_observed_m",
                                       "wl_forecasted_m")
return HttpResponse(json.dumps(list(getall),cls=DjangoJSONEncoder), content_type='application/json')
geta