Re: [LEAPSECS] Comparing Time Scales

From: Daniel R. Tobias <dan_at_TOBIAS.NAME>
Date: Fri, 03 Feb 2006 21:27:54 -0500

On 3 Feb 2006 at 15:37, James Maynard wrote:

> Thanks, guys, for your feedback. Here's another iteration.

It would seem that PTP is actually counting from 1970-01-01 00:00:00
in TAI rather than UTC; the subsequent values of that scale reflect
the full TAI-UTC offset, not just the part of it that occurred after
1970. For instance, the PTP value for 1972-01-01 00:00:00 UTC
consists of the number of seconds in the last two (non-leap) years
plus 10 seconds. The actual UTC value at 1970-01-01 reflected the
variable-length "rubber seconds" of the time, so the TAI-UTC offset
then was some fractional value that was less than 10 but greater than

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Received on Fri Feb 03 2006 - 18:26:16 PST

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