You could make a call with the document function (in a non-functional way :) ) to a back end that uses a custom uri resolver that, when receives a certain href, logs/writes the /real/ current-dateTime and returns <nothing/>.
That is not as trivial as you point out (I'm sorry, I only read this after my first post in this thread). The document() function, when called with the same arguments, must guarantee that the result is the same between calls. That means that this *real* date/time you are talking about will only be the real time once. Unless you use the technique I described earlier.
Cheers, -- Abel Braaksma
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