Richard Gibson <richard.j.gib...@oracle.com> wrote:
>
> I am currently going through a similar exercise in another context, and the
> best current text there explicitly characterizes the non-obvious day-based
> accounting of POSIX time.

In general I think it's best to just refer to POSIX on this matter, and
not try to restate the definition. POSIX is very clear and explicit about
the day-based accounting of seconds.

http://pubs.opengroup.org/onlinepubs/9699919799.2016edition/basedefs/V1_chap04.html#tag_04_16

> However, there may be C-DNS purposes that cannot tolerate such
> discontinuities, and they would presumably want to use a continuous monotonic
> timescale with a fixed offset from TAI (as is the case for e.g. GPS time).

That's practically unobtanium on most systems :-) Even if you have PTP
there isn't a fixed PTP epoch, though the SMPTE profile defines it to be
equivalent to POSIX time plus the TAI-UTC value from the IERS / NIST
leapsecond tables.

Tony.
-- 
f.anthony.n.finch  <d...@dotat.at>  http://dotat.at/
disperse power, foster diversity, and nurture creativity

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