RE: [LEAPSECS] making leap hours workable

From: Seeds, Glen <Glen.Seeds_at_Cognos.COM>
Date: Thu, 3 Jul 2003 17:00:57 -0400

I believe you would get very strong pushback from the POSIX world if you
tried to make the time base TAI rather than UTC. Without a strong case for
this change (which I haven't seen yet), I would be one of them.

-----Original Message-----
From: Steve Allen [mailto:sla_at_UCOLICK.ORG]
Sent: July 2, 2003 5:04 PM
Subject: Re: [LEAPSECS] making leap hours workable

On Wed 2003-07-02T15:45:44 -0400, Seeds, Glen hath writ:
> > From: Steve Allen [mailto:sla_at_UCOLICK.ORG]

> > Unlike the POSIX timestamping community which has buried its head
> > in the sand and refused to admit that time_t should be TAI, any
> > form of TI must be uniformly incrementing forever.
> There are several inaccuracies in this statement.
> The POSIX timestamping community has already had many long discussions of
> these issues. The current state of the standard reflects several

I stand by the tense of my statement: time_t *should* be TAI in order
that POSIX timestamps can be unambiguous and monotonically increasing.
I fully recognize the realities that prevent it from being TAI. And I
applaud the POSIX Real Time folks for taking the broader view which,
when fully implemented, will permit compatibility with existing usage
as well as monotonicity.

The notion of DUTH in my proposal is the safety valve which permits
leap seconds to be ignored for 500 years while still demanding that
there be a mechanism which will handle the longer term problems. If
such a DUTH scheme were implemented it might still be that posterity
would decide never to increment it, but at least they would have the
option built into the systems of the world.

sign me

Waiting (but not holding my breath) for the SRG to take the same sort
of broader view with respect to civil time and broadcast time signals.

Steve Allen          UCO/Lick Observatory       Santa Cruz, CA 95064      Voice: +1 831 459 3046
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Received on Thu Jul 03 2003 - 14:01:35 PDT

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