Revert "Use datetime.utcnow() for season sensor to get offset-naive u…

…tc time"

This reverts commit 5f36463.

homeassistant/components/season/sensor.py

@@ -8,6 +8,7 @@
 from homeassistant.const import CONF_TYPE
 from homeassistant.helpers.entity import Entity
 from homeassistant import util
+import homeassistant.util.dt as dt_util
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -104,7 +105,7 @@ def __init__(self, hass, hemisphere, season_tracking_type):
         """Initialize the season."""
         self.hass = hass
         self.hemisphere = hemisphere
-        self.datetime = datetime.utcnow()
+        self.datetime = dt_util.utcnow().replace(tzinfo=None)
         self.type = season_tracking_type
         self.season = get_season(self.datetime, self.hemisphere, self.type)
 
@@ -125,5 +126,5 @@ def icon(self):
 
     def update(self):
         """Update season."""
-        self.datetime = datetime.utcnow()
+        self.datetime = dt_util.utcnow().replace(tzinfo=None)
         self.season = get_season(self.datetime, self.hemisphere, self.type)