diff --git a/homeassistant/components/switch/flux.py b/homeassistant/components/switch/flux.py
index 00388822be1..b7585588f0a 100644
--- a/homeassistant/components/switch/flux.py
+++ b/homeassistant/components/switch/flux.py
@@ -25,7 +25,7 @@ from homeassistant.util import slugify
 from homeassistant.util.color import (
     color_temperature_to_rgb, color_RGB_to_xy_brightness,
     color_temperature_kelvin_to_mired)
-from homeassistant.util.dt import now as dt_now
+from homeassistant.util.dt import utcnow as dt_utcnow, as_local
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -195,10 +195,12 @@ class FluxSwitch(SwitchDevice):
 
         self.schedule_update_ha_state()
 
-    def flux_update(self, now=None):
+    def flux_update(self, utcnow=None):
         """Update all the lights using flux."""
-        if now is None:
-            now = dt_now()
+        if utcnow is None:
+            utcnow = dt_utcnow()
+
+        now = as_local(utcnow)
 
         sunset = get_astral_event_date(self.hass, 'sunset', now.date())
         start_time = self.find_start_time(now)
diff --git a/tests/components/switch/test_flux.py b/tests/components/switch/test_flux.py
index cb5207adb3e..34b37639cd1 100644
--- a/tests/components/switch/test_flux.py
+++ b/tests/components/switch/test_flux.py
@@ -87,7 +87,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=10, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=10, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -96,7 +96,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.util.dt.now', return_value=test_time):
+        with patch('homeassistant.util.dt.utcnow', return_value=test_time):
             with patch('homeassistant.helpers.sun.get_astral_event_date',
                        side_effect=event_date):
                 assert setup_component(self.hass, switch.DOMAIN, {
@@ -128,7 +128,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=2, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=2, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -137,7 +137,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.util.dt.now', return_value=test_time):
+        with patch('homeassistant.util.dt.utcnow', return_value=test_time):
             with patch('homeassistant.helpers.sun.get_astral_event_date',
                        side_effect=event_date):
                 assert setup_component(self.hass, switch.DOMAIN, {
@@ -174,7 +174,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=8, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=8, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -183,7 +183,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -221,7 +221,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=17, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=17, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -230,7 +230,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -269,7 +269,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=23, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=23, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -278,7 +278,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.util.dt.now', return_value=test_time):
+        with patch('homeassistant.util.dt.utcnow', return_value=test_time):
             with patch('homeassistant.helpers.sun.get_astral_event_date',
                        side_effect=event_date):
                 assert setup_component(self.hass, switch.DOMAIN, {
@@ -315,7 +315,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=17, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=17, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -324,7 +324,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -366,7 +366,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=2, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=2, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -375,7 +375,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -418,7 +418,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=8, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=8, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -427,7 +427,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -469,7 +469,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=23, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=23, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -478,7 +478,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.util.dt.now', return_value=test_time):
+        with patch('homeassistant.util.dt.utcnow', return_value=test_time):
             with patch('homeassistant.helpers.sun.get_astral_event_date',
                        side_effect=event_date):
                 assert setup_component(self.hass, switch.DOMAIN, {
@@ -519,7 +519,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=00, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=00, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -528,7 +528,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -570,7 +570,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=2, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=2, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -579,7 +579,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -618,7 +618,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=17, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=17, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -627,7 +627,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -668,7 +668,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=17, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=17, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -677,7 +677,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -729,7 +729,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertIsNone(state.attributes.get('xy_color'))
         self.assertIsNone(state.attributes.get('brightness'))
 
-        test_time = dt_util.now().replace(hour=12, minute=0, second=0)
+        test_time = dt_util.utcnow().replace(hour=12, minute=0, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -740,7 +740,7 @@ class TestSwitchFlux(unittest.TestCase):
             print('sunset {}'.format(sunset_time))
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -784,7 +784,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertEqual(STATE_ON, state.state)
         self.assertIsNone(state.attributes.get('color_temp'))
 
-        test_time = dt_util.now().replace(hour=8, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=8, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -793,7 +793,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):
@@ -829,7 +829,7 @@ class TestSwitchFlux(unittest.TestCase):
         self.assertEqual(STATE_ON, state.state)
         self.assertIsNone(state.attributes.get('color_temp'))
 
-        test_time = dt_util.now().replace(hour=8, minute=30, second=0)
+        test_time = dt_util.utcnow().replace(hour=8, minute=30, second=0)
         sunset_time = test_time.replace(hour=17, minute=0, second=0)
         sunrise_time = test_time.replace(hour=5, minute=0, second=0)
 
@@ -838,7 +838,7 @@ class TestSwitchFlux(unittest.TestCase):
                 return sunrise_time
             return sunset_time
 
-        with patch('homeassistant.components.switch.flux.dt_now',
+        with patch('homeassistant.components.switch.flux.dt_utcnow',
                    return_value=test_time), \
             patch('homeassistant.helpers.sun.get_astral_event_date',
                   side_effect=event_date):