Tobias Conradi <tobias.conradi@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/706... Tony. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ Shannon, Rockall, Malin: Southwest 4 or 5, occasionally 6 in Rockall and Malin, backing south 5 to 7 later, perhaps gale 8 later. Moderate or rough. Showers, rain later. Moderate or good, occasionally poor later.