How to configure our expected timestamp format in props.conf?

Hi, We need to format our time stamps using props.conf, since our events do not have date/month/year to our logs, it has only `%H:%M:%S`. we need to append `%Y/%M/%D` to every event. This is for our logs format looks like. 14:55:55,229 INFO [stdout] (ServerService THread Pool--64)ss_debug(1:)Sending secure hello message 14:55:55,232 INFO [stdout] (ServerService THread Pool--64)ss_debug(1:) server created new session Can you please provide props configuration for this? Thanks