[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 
technology.




More information about the questions mailing list