Richard used a bunch of material from the Colonial Warriors Technical Manual, which he placed at the end of one of his novels. For that act alone he got a mauling from certain quarters of fandom.
http://www.kobol.com/archives/timeunit.html
Personally, having invested (or wasted if you prefer) the time into figuring out the Colonial System merely reinforced my opinion that the sooner these Colonialisms were flushed out "canon", the better.
Note - there was no "day" in TOS, although you might have gotten away with time cycle.
