diff --git a/api/blueprints/finstitutions/trading/symbols/list.py b/api/blueprints/finstitutions/trading/symbols/list.py
index b3315cc..3b52a30 100644
--- a/api/blueprints/finstitutions/trading/symbols/list.py
+++ b/api/blueprints/finstitutions/trading/symbols/list.py
@@ -25,8 +25,7 @@
         N/A
 
 """
-
-
+import datetime
 #   *****************************************************************************************************************
 #  *****                                                                                                          ****
 # ***                                                   IMPORT                                                      ***
@@ -195,7 +194,10 @@ async def request_oauth_authorization_url(
 
     # Handle time data:
     data = [s.model_dump() for s in symbol_list.data] if symbol_list.data is not None else symbol_list.data
-    for d in data: d["expiryTs"] = d["expiryTs"].timestamp()
+    for d in data:
+        expiry_ts = d["expiryTs"]
+        if isinstance(expiry_ts, datetime.datetime):
+            d["expiryTs"] = expiry_ts.timestamp()
 
     # Done here:
     return ResponseModel(