On Apr 8, 2015, at 3:17 PM, Steve Allen <sla@ucolick.org> wrote:
On Wed 2015-04-08T19:02:07 +0000, Paul_Koning@dell.com hath writ:
So here is the puzzle. I would expect WWV, and www.time.gov, to reflect leap seconds. So why would they give me a time that matches, to the second, the POSIX time on my workstation? Does NTP send POSIX seconds since epoch rather than real ones?
NTP effectively sends "mean solar seconds elapsed since epoch", which is another way of saying "elapsed seconds not counting leap seconds" as is demanded by POSIX.
Thanks much! That sure is not clear from the RFC. So that explains things: it means that a POSIX system that is an NTP client will track UTC, leap seconds and all, except for a short while just after a leap second occurrence because at that point the NTP client machinery will be adjusting to the one second phase shift. paul