Poul-Henning Kamp said: >> The UK's standard time broadcast, which is funded by the government, >> contains DUT1 in a format which doesn't permit |DUT1|>0.9. Whatever >> people argue (rightly) about the de facto legal time in the UK being >> UTC, the de jure legal time is "GMT" which is taken to be UT1. > > Where and by who is that "taken to be UT1" ?
Just about everyone. Since GMT well predates the invention of UTC, it can't be anything other than UT, UT1, or UT2. > Just because the additional DUT information is broadcast is no guarantee > that any decodes it and uses it. True but irrelevant. > And I certainly do not see a DUT offset between NTP servers in the > rest of the world and NTP servers in the UK. Because those NTP servers provide UTC-with-leap-second-issues, not UT1, just like the ones in the rest of the world. Curiously enough, NTP is *NOT* the definition of legal time in the UK. > You will need to document this claim before anybody will buy it, Which one? That GMT = UTC? That legal time is GMT? > and I am quite sure that if you can, a lot of people will be > very surprised... Well, as to the latter, the 1978 law says: | Subject to section 3 of the Summer Time Act 1972 (construction of | references to points of time during the period of summer time), whenever an | expression of time occurs in an Act, the time referred to shall, unless it | is otherwise specifically stated, be held to be Greenwich mean time. This is almost certainly a tidying up of older legislation in the same wording, but I don't have quick access to that. The Summer Time Act 1972 says: | 1(1) The time for general purposes in Great Britain shall, during the | period of summer time, be one hour in advance of Greenwich mean time. | (2) The period of summer time for the purposes of this Act is the period | beginning at one o'clock, Greenwich mean time, in the morning of the last | Sunday in March and ending at one o'clock, Greenwich mean time, in the | morning of the last Sunday in October. | | 3(1) Subject to subsection (2) below, wherever any reference to a point | of time occurs in any enactment, Order in Council, order, regulation, | rule, byelaw, deed, notice or other document whatsoever, the time referred | to shall, during the period of summer time, be taken to be the time as | fixed for general purposes by this Act. | (2) Nothing in this Act shall affect the use of Greenwich mean time for | purposes of astronomy, meteorology, or navigation, or affect the | construction of any document mentioning or referring to a point of time in | connection with any of those purposes. The 1954 legislation for Northern Ireland says: | Words in an enactment relating to time and references therein to a point of | time shall be construed as relating or referring to Greenwich mean time, | subject, however, to any statutory provision which may for the time being | provide that, during any specified period or periods, time in Northern | Ireland is to differ from Greenwich mean time. -- Clive D.W. Feather | If you lie to the compiler, Email: cl...@davros.org | it will get its revenge. Web: http://www.davros.org | - Henry Spencer Mobile: +44 7973 377646 _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
