The number of seconds since the Epoch, UTC is a very useful piece of information to have when trying to find an event in personal logs. Since it is one long (usually relatively unique in logs) number, it is fairly simple to use it with grep. This is much easier than manually finding the correct log file for the day and channel in question and then searching for the correct line. It should also be fairly trivial to add this feature. It is %s in the strftime() man page. mktime(3) also has some more information about it. I cannot see any negative to adding this additional piece of information to the logs, people who don't care about it can simply ignore it.