never mind, I think the right key to use is $msec, found it in the new wiki,which by the way is much better than the old one.
From: Mohammad Kolahdouzan <moha...@yahoo.com>
Sent: Wednesday, March 11, 2009 10:38:02 PM
Subject: logging epoch time
Is there any way we can log epoch time and not the string format that$time_local generates?