It's not always the case, but you can usually see some Julian calender reference there. Why not post what you see so we can attempt to decipher it with you??
For example, my LOWTOX antifreeze read 3F 6167 23:59
I'd read that as June 16, 2007 @ 11:59pm as the most likely date. In 2010 it might read 61610 or 6160