INPUT - request

{
	"task_id": "1",
	"dates": ["2018-01-02"],
	"hours_from": "15:00",
	"hours_to": "12:00"
}

MODELS

class Day(models.Model):
    user = models.ForeignKey('auth.User',
                             on_delete=models.PROTECT,
                             related_name='created_events')
    date = models.DateField(default=timezone.now)
    creation_date = models.DateTimeField(default=timezone.now)


class Event(Day):
    task = models.ForeignKey(Task,
                             on_delete=models.PROTECT,
                             related_name='related_events')
    hour_from = models.TimeField(default=timezone.now)

    hour_to = models.TimeField(default=timezone.now)

    task_name = models.CharField(max_length=64, null=True, blank=True)


SERIALIZER
class EventSerializer(serializers.ModelSerializer):

    hour_from = serializers.TimeField()
    hour_to = serializers.TimeField()

    def validate(self, data):
        """
        Check that the start is before the stop.
        """

        if data['hour_from'] > data['hour_to']:
            raise serializers.ValidationError("finish must occur after start")
        return data

    class Meta:
        model = Event
        fields = ('task_id', 'task_name', 'date', 'hour_from', 'hour_to', 'user')


VIEWS
class EventViewSet(LoggingMixin, viewsets.ModelViewSet):
    queryset = Event.objects.all()
    serializer_class = EventSerializer

    def get_queryset(self):
        user = self.request.user
        events_by_user = Event.objects.filter(user=user)
        today = datetime.date.today()
        data = events_by_user.filter(date__year=today.year,
                                     date__month=today.month)
        return data

    def create(self, request):
		time_from = request.data.__getitem__('hours_from')
        hours_from = datetime.datetime.strptime(time_from, '%H:%M').time()
        time_to = request.data.__getitem__('hours_to')
        hours_to = datetime.datetime.strptime(time_to, '%H:%M').time()
        user = request.user
        dates = request.data['dates']
        task_pk = int(request.data.__getitem__('task_id'))
        task = Task.objects.filter(pk=task_pk)[0]
        task_name = Task.objects.filter(pk=task_pk).get()
        created_events = []
        for i in dates:
            date = datetime.datetime.strptime(i, "%Y-%m-%d").date()
            event = Event.objects.create(
                user=user,
                task=task,
                date=date,
                hour_from=hours_from,
                hour_to=hours_to,
                task_name=task_name
            )
            created_events.append(event)
        events = EventSerializer(created_events, many=True).data
        return Response(events, status=status.HTTP_201_CREATED)