replace timezone with datetime

Since the plots are not really part of django they aren't returning timezone
objects which django can convert to the correct timezone. Therefore they are
always UTC. However we can disable the timezone support in django. The're might
be a more elegant solution to this but since this is just a small project I'll
leave it at that.

sensors/collector/collector.py

@@ -1,5 +1,5 @@
 import os
-from django.utils import timezone
+from datetime import datetime
 
 if os.uname()[4].startswith("arm"):
     from sense_hat import SenseHat
@@ -27,7 +27,7 @@ def get_humidity():
 
 
 def values_to_db():
-    time = timezone.now()
+    time = datetime.now()
     Temperature.objects.create(value=get_temperature(), time=time)
     Humidity.objects.create(value=get_humidity(), time=time)
     Pressure.objects.create(value=get_pressure(), time=time)

sensors/collector/plot.py

@@ -1,11 +1,11 @@
 from datetime import timedelta
-from django.utils import timezone
+from datetime import datetime
 from plotly.offline import plot
 from plotly.graph_objs import Scatter
 from collector.models import Temperature, Humidity, Pressure
 
 
-start_time = timezone.now() - timedelta(hours=12)
+start_time = datetime.now() - timedelta(hours=12)
 
 def temperature():
     data = Temperature.objects.filter(time__gt=start_time)

sensors/sensors/settings/base.py

@@ -95,7 +95,7 @@ USE_I18N = True
 
 USE_L10N = True
 
-USE_TZ = True
+USE_TZ = False
 
 
 # Static files (CSS, JavaScript, Images)