fix datetime handling in extract_events_from_caption

Author: ericahan22

backend/services/openai_service.py

@@ -114,12 +114,7 @@ def extract_events_from_caption(
         current_date = now.strftime("%Y-%m-%d")
         current_day_of_week = now.strftime("%A")
 
-        # Use post creation time if provided, else current time
-        if post_created_at and isinstance(post_created_at, datetime):
-            post_created_at_str = post_created_at.isoformat()
-        else:
-            post_created_at_str = ""
-        context_datetime = post_created_at_str if post_created_at_str else now
+        context_datetime = post_created_at if isinstance(post_created_at, datetime) else now
         context_datetime = pytz_timezone("America/Toronto").localize(
             context_datetime.replace(tzinfo=None)
         )