[time-nuts] Accuracy of UTC from GPS?

[Magnus Danielson]

On 07/02/2012 03:18 PM, Brooke Clarke wrote:
> Hi:
>
> The Heathkit GC1000 Most Accurate Clock makes the daylight saving time 1
> hour change when Colorado changes time, not when your time zone should
> make the change so it's off 1 hour for a few hours on two days a year.
> http://www.prc68.com/I/HeathkitGC1000.shtml

Which of the clocks in Colorado? NIST? GPS MC? WWVB?

UTC(GPS), UTC(USNO) and UTC(NIST) is within a few ns from each other in 
practice. See Circular T for instance. USNO keeps a webpage with the 
UTC(GPS)-UTC(USNO) difference.

> Does the GPS receiver know to make the proper minute have 61 seconds or
> is it displaying the wrong UTC time for some fraction of a day?

If done properly, it ticks in GPS time which does not have leap seconds. 
Leap seconds is only introduced in the time-presentation.

Cheers,
Magnus