UTC as basis for time legislation

[Tony Finch]

Tobias Conradi <tobias.conradi at gmail.com> wrote:
>
> Also I don't understand why tzdata approximation is involved.

The approximation is not in tzdata it is in the definition of civil time,
which as Clive illustrated is often not clearly defined.

> I would assume that legal GMT in the UK in the year 2011 is exactly
> the same as UTC. I could not find a law for that.

No, the law here says legal time is GMT, but most official time signals
are UTC. There have been a few unsuccessful attempts to deal with the
mismatch between de jure and de facto UK time, e.g.
http://www.publications.parliament.uk/pa/ld199798/ldhansrd/vo970611/text/70611-10.htm

Tony.
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