Portable general timestamp format, not 2038-limited

Martin Gregorie martin at see.sig.for.address
Mon Jul 2 00:36:00 CEST 2007


Roedy Green wrote:
> On Sun, 01 Jul 2007 17:47:36 +0100, Martin Gregorie
> <martin at see.sig.for.address> wrote, quoted or indirectly quoted
> someone who said :
> 
>> GPS time is UTC time and I'd assume the same is true for Loran.
> 
> not according to this site that has clocks running on all three.
> They are out slightly.
>  
> http://www.leapsecond.com/java/gpsclock.htm
 >
A useful reference: thanks. Interesting that GPS and Loran are slightly 
out from Zulu. I'll ask round and see if this is something that ATP 
pilots are aware of: as a glider pilot and GPS user I'd never heard of 
it. So far the deviations from UTC are probably not enough to affect 
navigation significantly, but I wonder if banks using networks that 
timestamp transactions with GPS time know about it. Of course the 
deviation can't affect disputes where the timestamps are being used to 
decide event sequences within a single network. However, there could be 
legal implications if absolute time is important or if the timestamps 
are being compared across different networks, e.g SWIFT vs CHAPS or Fedwire.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |



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