Replace naive datetime with timezone aware.

- Add missing Serializer,
- also clean-up unused imports.

program/views.py

-# -*- coding: utf-8 -*-
-
 import json
 from datetime import date, datetime, time, timedelta
 
-from django.db.models import Q
-from django.utils.translation import ugettext_lazy as _
-from django.core.exceptions import ObjectDoesNotExist
 from django.contrib.auth.models import User
-from django.http import Http404, HttpResponse, JsonResponse
+from django.db.models import Q
+from django.http import HttpResponse
 from django.shortcuts import get_object_or_404
+from django.utils import timezone
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic.base import TemplateView
 from django.views.generic.detail import DetailView
 from django.views.generic.list import ListView
-from django.forms.models import model_to_dict
-from rest_framework import permissions, serializers, status, viewsets
-from rest_framework.views import APIView
-from rest_framework.response import Response
+from rest_framework import permissions, status, viewsets
 from rest_framework.pagination import LimitOffsetPagination
+from rest_framework.response import Response
 
-from program.models import Type, MusicFocus, Language, Note, Show, Category, FundingCategory, Topic, TimeSlot, Host, Schedule, RRule
-from program.serializers import TypeSerializer, LanguageSerializer, MusicFocusSerializer, NoteSerializer, ShowSerializer, ScheduleSerializer, CategorySerializer, FundingCategorySerializer, TopicSerializer, TimeSlotSerializer, HostSerializer, UserSerializer
+from program.models import Type, MusicFocus, Language, Note, Show, Category, FundingCategory, Topic, TimeSlot, Host, Schedule
+from program.serializers import TypeSerializer, LanguageSerializer, MusicFocusSerializer, NoteSerializer, ShowSerializer, \
+    ScheduleSerializer, CategorySerializer, FundingCategorySerializer, TopicSerializer, TimeSlotSerializer, HostSerializer, \
+    UserSerializer
 from program.utils import tofirstdayinisoweek, get_cached_shows
 
+
 # Deprecated
 class CalendarView(TemplateView):
     template_name = 'calendar.html'
@@ -30,7 +29,7 @@ class CalendarView(TemplateView):
 # Deprecated
 class HostListView(ListView):
     context_object_name = 'host_list'
-    queryset = Host.objects.filter(Q(is_active=True) | Q(shows__schedules__until__gt=datetime.now())).distinct()
+    queryset = Host.objects.filter(Q(is_active=True) | Q(shows__schedules__until__gt=timezone.now())).distinct()
     template_name = 'host_list.html'
 
 
@@ -85,7 +84,7 @@ class RecommendationsListView(ListView):
     context_object_name = 'recommendation_list'
     template_name = 'recommendation_list.html'
 
-    now = datetime.now()
+    now = timezone.now()
     end = now + timedelta(weeks=1)
 
     queryset = TimeSlot.objects.filter(Q(note__isnull=False, note__status=1,
@@ -167,7 +166,7 @@ class WeekScheduleView(TemplateView):
         week = self.kwargs.get('week', None)
 
         if year is None and week is None:
-            year, week = datetime.now().strftime('%G__%V').split('__')
+            year, week = timezone.now().strftime('%G__%V').split('__')
 
         monday = tofirstdayinisoweek(int(year), int(week))
         tuesday = monday + timedelta(days=1)
@@ -335,7 +334,7 @@ def json_timeslots_specials(request):
         if show['type'] == 's':
             specials[show['id']] = show
 
-    for ts in TimeSlot.objects.filter(end__gt=datetime.now(),
+    for ts in TimeSlot.objects.filter(end__gt=timezone.now(),
                                       schedule__automation_id__in=specials.iterkeys()).select_related('show'):
         automation_id = ts.schedule.automation_id
         start = ts.start.strftime('%Y-%m-%d_%H:%M:%S')
@@ -418,6 +417,7 @@ class APIUserViewSet(viewsets.ModelViewSet):
 
     def update(self, request, pk=None):
 
+        serializer = UserSerializer(data=request.data)
         # Common users may only edit themselves
         if not request.user.is_superuser and int(pk) != request.user.id:
             return Response(serializer.initial_data, status=status.HTTP_401_UNAUTHORIZED)
@@ -730,8 +730,8 @@ class APITimeSlotViewSet(viewsets.ModelViewSet):
         end = start + timedelta(days=60)
 
         if self.request.GET.get('start') and self.request.GET.get('end'):
-            start = datetime.combine( datetime.strptime(self.request.GET.get('start'), '%Y-%m-%d').date(), time(0, 0))
-            end = datetime.combine( datetime.strptime(self.request.GET.get('end'), '%Y-%m-%d').date(), time(23, 59))
+            start = datetime.combine(datetime.strptime(self.request.GET.get('start'), '%Y-%m-%d').date(), time(0, 0))
+            end = datetime.combine(datetime.strptime(self.request.GET.get('end'), '%Y-%m-%d').date(), time(23, 59))
 
         '''Endpoints'''
 
@@ -776,7 +776,7 @@ class APITimeSlotViewSet(viewsets.ModelViewSet):
         Timeslots may only be created by adding/updating schedules
         TODO: Adding single timeslot which fits to schedule?
         """
-        return Response(status=HTTP_401_UNAUTHORIZED)
+        return Response(status=status.HTTP_401_UNAUTHORIZED)
 
 
     def update(self, request, pk=None, schedule_pk=None, show_pk=None):
@@ -1178,4 +1178,4 @@ class APIHostViewSet(viewsets.ModelViewSet):
         if self.request.GET.get('active') == 'false':
             return Host.objects.filter(is_active=False)
 
-        return Host.objects.all()
+        return Host.objects.all()
\ No newline at end of file