[time-nuts] [Fwd: GPS 256 week rollover may be causing problems for some GPS receivers]

M. Warner Losh imp at bsdimp.com
Fri Jun 19 18:54:08 EDT 2009


In message: <4813.1245444080 at critter.freebsd.dk>
            "Poul-Henning Kamp" <phk at phk.freebsd.dk> writes:
: In message <20090619.143448.2102305600.imp at bsdimp.com>, "M. Warner Losh" writes
: :
: >In message: <4A3BF553.20205 at rubidium.dyndns.org>
: >            Magnus Danielson <magnus at rubidium.dyndns.org> writes:
: >: Have any of you seen the reported problems?
: >
: >"These counts started at 0 roughly at midnight UTC 6 Jan 1980"
: >
: >What does "roughly" mean here in this context?
: 
: That the we have leap seconds.

But midnight UTC time on 6 Jan 1980 was exactly the same thing as
second 0 in GPS time.

Leap seconds, while an evil complication to UTC, don't enter the
synchronization point issue at all.  It wasn't even Jan 1 when the
leap second might have happened...  Hence my confusion...

Warner




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