Update astro_core.py

astro_core.py

@@ -21,8 +21,12 @@ class ChartCalculator:
         Calculate birth chart positions
         Returns a dictionary of planetary positions and house cusps
         """
-        # Convert to flatlib datetime
-        date = Datetime(birth_datetime, timezone)
+        # Convert datetime to format required by flatlib
+        date_str = birth_datetime.strftime("%Y/%m/%d")
+        time_str = birth_datetime.strftime("%H:%M")
+        
+        # Create flatlib datetime object
+        date = Datetime(date_str, time_str, timezone)
         pos = GeoPos(latitude, longitude)
         
         # Calculate chart