Currently Audit Log Files (default: access.log) do not support Precise Date/Time Format. This feature is only supported in Trace logs. Unfortunately using trace logs for performance analysis would be more difficult to process because it contains too much information. Some of them would be needed to be filtered out . Also having trace run all the time can be taxing to the system and resources.
Currently Advance Formatted Audit logs provide the right amount of data for performance analysis. Its only drawback is that it does not support precise date/time.
May I propose that Precise Time/Date setting for Audit Logs be available for the next release as enhancement