I think what the original poster had in mind was using an Arduino with an external time sourch (like a GPS receiver) as a self-built NTP time server for other machines on the network. Instead of using a full-blown machine, this would be a nice, quiet, reliable way to do so.
This sounds like an excellent idea, and I believe someone was working on (see here
). There are a few other projects of the type (see this one
for a non-Arduino solution). Does anyone else have another project or some guidance, since I am also interested?