And indeed :-)
All minimally conforming processors ·must· support [...] a minimum
fractional second precision of 1 millisecond or three digits (i.e.,
s.sss).
-- XQuery 1.0 and XPath 2.0 F. & O., 10.1.1 Limits and Precision
http://www.w3.org/TR/xquery-operators/#date-time-duration-conformance
But then, your network router probably does have a reasonable clock.
I don't think an acurate clock is required, I believe that that refers
to the required accuracy in the date arithmetic, not any requirement to
have an accurate clock.
David
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