UTC as basis for time legislation

[Tobias Conradi]

On Sat, Sep 24, 2011 at 3:53 AM, Steve Allen <sla at ucolick.org> wrote:
> On 2011 Sep 23, at 18:44, <Paul_Koning at Dell.com> wrote:
>> So if country A says its legal time is an hour ahead of GMT and B says they are an hour ahead of UTC, those are technically different statements.  However, to the approximation of tzdata, the outcome is the same: both country A and B would be shown in the tzdata file as having an offset of 60 minutes.
>>
>> Is that correct?
>
> It is correct under ITU-R TF.460-6.

http://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.460-6-200202-I!!PDF-E.pdf
has no reference to GMT.

Also I don't understand why tzdata approximation is involved.

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.

Maybe an older legal definition would make GMT the same as UT0.

ITU-R TF.460-6:
"UT0 is the mean solar time of the prime meridian obtained from direct
astronomical observation;"

Can anyone give a UK law relating GMT to UTC?


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