This is just a simple addon that adds timestamps to every chat message that comes into the log.
The time stamp is in the format HH:mm:ss:fff, where HH is the 24-hour, mm is minute, ss is the second and fff is the millisecond.
Please note that Timestamper will not start timestamping messages until about 1 second after you have logged in - it needs this time to detect the millisecond.