jakdedert writes:

FWIW, there are utilities which will update your computer clock from the
National Bureau of Standards over the web.....

There's much more than that. There's NTP, which will keep your system
clock accurate to within milliseconds without too much trouble. You
can also get radio-controlled hardware clocks for installation inside
the machine, as well as GPS clocks for even better accuracy.
Radio-controlled clocks and NTP over broadband are grossly comparable,
but GPS is more accurate still. All of these are far more accurate
than the basic clock in the PC alone, which is often off by seconds
per day.

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