diff --git a/app/modules/employees/service.py b/app/modules/employees/service.py
index 92661d6..820764c 100644
--- a/app/modules/employees/service.py
+++ b/app/modules/employees/service.py
@@ -3263,8 +3263,16 @@ def _engagement_sla(subscription: ClientServiceSubscription | None, tasks: list[
     if due_date is None:
         dates = [getattr(task, "internal_target_date", None) for task in tasks if getattr(task, "internal_target_date", None)]
         due_date = max(dates) if dates else None
-    started_dates = [getattr(task, "started_at_utc", None) for task in tasks if getattr(task, "started_at_utc", None)]
-    created_at = getattr(subscription, "created_at_utc", None) if subscription is not None else None
+    started_dates = [
+        _as_utc_aware(getattr(task, "started_at_utc", None))
+        for task in tasks
+        if getattr(task, "started_at_utc", None)
+    ]
+    created_at = (
+        _as_utc_aware(getattr(subscription, "created_at_utc", None))
+        if subscription is not None
+        else None
+    )
     anchor = min(started_dates) if started_dates else created_at
     age_days = max((datetime.now(timezone.utc) - anchor).days, 0) if anchor else 0
     days_remaining = (due_date - today).days if due_date else None