[ntp:questions] National time standard differences

Richard B. Gilbert rgilbert88 at comcast.net
Tue Feb 9 15:12:39 UTC 2010

cc wrote:
> On 9 Feb, 11:52, "David J Taylor" <david-tay... at blueyonder.delete-this-
> bit.and-this-part.co.uk.invalid> wrote:
>> "cc" <cjcrick... at googlemail.com> wrote in message
>> news:fc3f6bee-dc69-44ec-8525-0cdac516f2a9 at g28g2000yqh.googlegroups.com...
>> []
>>> I wouldn't have thought so either and given that they all trace back
>>> to GPS it isn't likely either but it made me consider the natioanal
>>> security / financial implications of setting your national clock 10ms
>>> ahead of where everyone else thinks it is.
>>> Chris.
>> I suspect they all trace back to their own atomic clocks, which gives a
>> good frequency reference, and then they adjust the phase to all be in
>> sync.  These days I would guess that GPS is used for the phase (time)
>> sync.  There are others on this list who know far more about this than I
>> do, though.
>> So if your loan is 10ms overdue, how much extra interest might you get?
>> <G>
>> Cheers,
>> David
> I was thinking more along the lines of a stock market open times /
> trade times.
> Chris.

ISTR that the stock markets require time stamps to be within two seconds 
of the "true time".  That's not terribly demanding, given the available 

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