fix: Convert Jalali date to datetime for order creation timestamp

backend/order/signals.py

@@ -142,6 +142,20 @@ def create_shop_orders_on_payment(sender, instance: OrderModel, created, **kwarg
                 address_province = instance.address.province
                 address_recipient_name = instance.address.name
 
+            # Convert Jalali date to datetime if needed
+            order_created_datetime = None
+            if instance.created_at:
+                try:
+                    # If it's already a datetime, use it
+                    if hasattr(instance.created_at, 'hour'):
+                        order_created_datetime = instance.created_at
+                    else:
+                        # If it's a date, convert to datetime at midnight
+                        from datetime import datetime, time
+                        order_created_datetime = datetime.combine(instance.created_at, time.min)
+                except Exception:
+                    order_created_datetime = None
+
             shop_order = ShopOrderModel.objects.create(
                 order=instance,
                 shop=shop,
@@ -165,7 +179,7 @@ def create_shop_orders_on_payment(sender, instance: OrderModel, created, **kwarg
                 commission_amount=commission_amount,
                 tax_amount=allocated_tax,
                 payable_amount=payable,
-                order_created_at=instance.created_at,
+                order_created_at=order_created_datetime,
             )
 
             # Create ShopOrderItem rows linking to original OrderItemModel