diff --git a/pychunkedgraph/app/__init__.py b/pychunkedgraph/app/__init__.py
index b6a461707..f4478c0e3 100644
--- a/pychunkedgraph/app/__init__.py
+++ b/pychunkedgraph/app/__init__.py
@@ -41,6 +41,9 @@ def default(self, obj):
         elif isinstance(obj, datetime.datetime):
             return obj.__str__()
         elif isinstance(obj, pd.DataFrame):
+            for col, col_dtype in obj.dtypes.items():
+                if isinstance(col_dtype, pd.DatetimeTZDtype):
+                    obj[col] = obj[col].map(lambda x: x.timestamp())
             return obj.to_json()
         return json.JSONEncoder.default(self, obj)
 
diff --git a/pychunkedgraph/app/segmentation/v1/routes.py b/pychunkedgraph/app/segmentation/v1/routes.py
index 382883d68..710100950 100644
--- a/pychunkedgraph/app/segmentation/v1/routes.py
+++ b/pychunkedgraph/app/segmentation/v1/routes.py
@@ -193,7 +193,7 @@ def handle_user_operations(table_id):
     if disp:
         return user_operations.to_html()
     else:
-        return user_operations.to_json()
+        return jsonify_with_kwargs(user_operations)
 
 
 ### GET ROOT -------------------------------------------------------------------
@@ -398,7 +398,7 @@ def tabular_change_log_weekly(table_id):
     if disp:
         return weekly_tab_change_log.to_html()
     else:
-        return weekly_tab_change_log.to_json()
+        return jsonify_with_kwargs(weekly_tab_change_log)
 
 
 @bp.route("/table/<table_id>/root/<root_id>/change_log", methods=["GET"])
@@ -422,7 +422,7 @@ def tabular_change_log(table_id, root_id):
     tab_change_log = tab_change_log_dict[int(root_id)]
     if disp:
         return tab_change_log.to_html()
-    return tab_change_log.to_json()
+    return jsonify_with_kwargs(tab_change_log)
 
 
 @bp.route("/table/<table_id>/tabular_change_log_many", methods=["GET"])