diff --git a/api/core/tools/builtin_tool/providers/time/tools/timezone_conversion.py b/api/core/tools/builtin_tool/providers/time/tools/timezone_conversion.py
index 796c38b69798b8..f9b776b3b99adb 100644
--- a/api/core/tools/builtin_tool/providers/time/tools/timezone_conversion.py
+++ b/api/core/tools/builtin_tool/providers/time/tools/timezone_conversion.py
@@ -48,6 +48,6 @@ def timezone_convert(current_time: str, source_timezone: str, target_timezone: s
             datetime_with_tz = input_timezone.localize(local_time)
             # timezone convert
             converted_datetime = datetime_with_tz.astimezone(output_timezone)
-            return converted_datetime.strftime(format=time_format)
+            return converted_datetime.strftime(format=time_format)  # type: ignore
         except Exception as e:
             raise ToolInvokeError(str(e))