Replace timezone.localtime with local_planned_start_date method

tournaments/models/tournament.py

@@ -2146,7 +2146,7 @@ class Tournament(BaseModel):
 
         for match in planned_matches:
             # Convert to local time zone
-            local_date = timezone.localtime(match.planned_start_date)
+            local_date = match.local_planned_start_date()
             day_key = local_date.date()
             days.add(day_key)
 
@@ -2171,7 +2171,7 @@ class Tournament(BaseModel):
                 # Group matches by hour
                 matches_by_hour = {}
                 for match in matches_by_day[selected_day]:
-                    local_time = timezone.localtime(match.planned_start_date)
+                    local_time = match.local_planned_start_date()
                     hour_key = local_time.strftime('%H:%M')
 
                     if hour_key not in matches_by_hour: