TimeStamp in Eventlog analyzer

Hi ,
I have tried to write a program to do my analyzer based on the eventlog analyzer's database.
I can read the eventlog from the table names like "eventlog_20070911183916" or "comp_eventlog_20070912005016" . but the timestamp in those tables are look like 1189010903000.
this is definitely not the standard MySql timestamp format.
how can I convert it to datetime ?

I just want to analyze the security log, I have tried to read the log directly from the target computer, but that computer is domain control, and everytime I read the log, it generate a new log in security log . so it may generate 70k new logs on security log.
that is why I choose to read the sucurity log form this database instead of computer's eventlog.