On 21 Jan 2012, at 23:42, Tony Finch wrote:

> On 21 Jan 2012, at 18:53, Ian Batten <i...@batten.eu.org> wrote:
>> 
>> allow DUT1 to grow to 31 minutes, and then allow anyone who wants to reduce 
>> DUT1 to 29 minutes to change their time zone
> 
> No that isn't how it works. DUT1 is the difference between UT1 and UTC. It 
> has nothing to do with local time, so it cannot be affected by a change of 
> timezone. The relevant comparison is between UTC plus TZ offset, and UT1 plus 
> longitude divided by fifteen.

Sorry, yes, that's why I intended to mean.  I meant the offset between UTC as 
modified by time zone (ie civil time disseminated by radio, television and 
computers), and local apparent solar time as experienced by voters looking up 
in the sky.

ian

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