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Thu Mar 15 13:12:39 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-March/117687.html

On Thu, Mar 15, 2012 at 1:10 PM, Paul Moore <p.f.moore at gmail.com> wrote:
>> Monotonic clocks are not necessarily hardware based, and may be adjusted
>> forward by NTP.
>
> I appreciate that. But I'm still unclear how you would tell that had
> happened as part of the implementation. One call to the OS returns
> 12345. The next returns 13345. Is that because 100 ticks have passed,
> or because the clock "leapt forward"? With no point of reference, how
> can you tell?

The point (AIUI) is that you *can't* identify such adjustments (in the
absence of some sort of log of NTP updates), so we should provide a
mechanism that is guaranteed not to be affected by them.

Cheers,
Nadeem

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[Python-Dev] Drop the new time.wallclock() function?