fix error with geteightam date

tournaments/models/tournament.py

@@ -947,7 +947,7 @@ class Tournament(BaseModel):
         matches = [m for m in bracket_matches if m.start_date is not None]
         if len(matches) == 0:
             return None
-        return min(matches, key=lambda m: m.start_date)
+        return min(matches, key=lambda m: m.start_date).start_date
 
     def getEightAm(self, date):
         return date.replace(hour=8, minute=0, second=0, microsecond=0, tzinfo=date.tzinfo)