UTC as basis for time legislation

Tobias Conradi tobias.conradi at gmail.com
Sat Sep 24 03:15:03 UTC 2011

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.

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?

Tobias Conradi
Rheinsberger Str. 18
10115 Berlin


More information about the tz mailing list