fix timezone aware issue in playtime calc

utils/models.py

@@ -8,12 +8,11 @@ from pytz import timezone
 
 import httpx
 from tortoise import fields
-from tortoise.functions import Sum
-from tortoise.expressions import F
-from tortoise.models import Model, Q
+from tortoise.models import Model
 from discord import Embed
 
 log = logging.getLogger(__name__)
+utc = timezone("UTC")
 
 
 class SteamProfileSummary(Model):
@@ -81,7 +80,7 @@ class PlayerSession(Model):
     @property
     def playtime(self) -> timedelta:
         if not self.disconnected_at:
-            return datetime.now() - self.connected_at
+            return datetime.now(tz=utc) - self.connected_at
 
         return self.disconnected_at - self.connected_at
 
@@ -99,8 +98,6 @@ class Player(Model):
         log.info("Getting total playtime for player: %s", self.username)
         sessions = await PlayerSession.filter(player=self)
         total_playtime = timedelta()
-        now = datetime.now()
-        utc = timezone("UTC")
 
         # I know this is terrible efficiency-wise, but the tortoise docs
         # are so bad and the annotations don't work like Django's models.  Deal with it!