Re: Re: [FeedValidator] What timezones should be valid?

On Sat, Feb 23, 2008 at 1:35 PM, James Holderness <[email protected]> wrote:
>
>  Perhaps I've misunderstood what you're saying, but just to be clear, GMT
>  never changes as a result of daylight savings. Britain does have a form of
>  daylight savings (referred to as British Summer Time or BST), but that is
>  defined as GMT+1 (GMT itself doesn't change).

James is correct.

>  As I understand it, the difference between UTC and GMT has to do with
> atomic
>  time measurement vs. astronomical calculations. For the most part the
>  differences are insignificant.

GMT [1] and UTC [2] have been the same thing since 1972 (also referred
to as 'Zulu' time - hence the 'Z' you sometimes see appended to UTC
date/time stamps).

The 'C' in UTC refers to co-ordination by the "International Earth
Rotation and Reference Systems Service" [3] of atomic clocks in
Greenwich, Paris and at the US Naval Observatory (which then updates
the GPS satellites so we don't get lost using our geo-location
gizmos).

[1] http://wikipedia.org/wiki/GMT
[2] http://wikipedia.org/wiki/UTC
[3] http://wikipedia.org/wiki/IERS

Regards,
Alan Dean
http://thoughtpad.net/alan-dean
http://simplewebservices.org


 
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