On 2018-01-20, Dr J R Stockton <
J.R.St...@physics.org> wrote:
> On Monday, January 8, 2018 at 4:34:04 PM UTC, Jon Ribbens wrote:
>> It's Microsoft that (falsely/misleadingly) claims that the UK's
>> time zone is "GMT". What is your reason for agreeing with them?
>
> Well, I rarely like agreeing with them; but if & when they claim
> that the UK's Time Zone is permanently 0, GMT, UTC, GMT+0, UTC-0,
> etc., they are correct - which does not of course prevent other
> parts of the firm from being wrong.
I'm thinking mostly of Outlook meeting invites, which describe
the date and time in the following format:
TZID=GMT Standard Time:20180601T150000
which is at best extremely misleading and at worst completely wrong.
Apple Mail invites look like the following instead:
TZID=Europe/London:20180601T150000
which is much clearer. (Amusingly, the Apple invite also appears
for some reason to contain the complete daylight savings rules for
the UK from 1916 to the present day.)
> The Standard Time in the UK (a modicum excepted, according to Clive)
> is (by Law, as translated from the EU, IIRC) GMT - however, the UK's
> standard time is UTC-based. Time Zones are normally designated by
> the nominal number of hours by which the Standard Time is offset
> from UTC, which for the UK (except ...) is 0. GMT and UTC are
> similar but not synonymous.
No, the time in time zones is designated that way, but the time zone
itself is not. For example, the time in the UK and the time in Mali
are both currently GMT+0 but they are not in the same time zone as
in a few months the UK will be GMT+1 and Mali will still be GMT+0.
>> "NPL BIPM NIST" is not a cite.
>
> Agreed not a cite. But you can look them up in Wikipedia (for NPL,
> an intelligent selection is then needed) and thence access their Web
> sites.
You might as well cite "the Internet". The problem is not that
I don't know what those organisations are or that I cannot find
their websites, the problem is that you have given no indication
which of their hundreds of thousands of publications you are
referring to.
> GMT is not the formal name of our Time Zone, just an adequate
> nickname, but the Standard Time in the UK (") is by Law GMT (IIRC)
> and in practice is UTC.
My point is that it is not at all an adequate nickname, because if you
use it that way then in the summer if someone says "I'll meet you at
3pm GMT" you have no way of knowing what time they intend to meet you.
Amusingly, something like this sort of issue actually came up last night,
as I was going to an event at the "St Moritz" club in London which was
advertised by a Facebook event. Facebook had assumed the organiser
meant St Moritz in Switzerland so the advertised start time for the
event was "22:00 CET", and I had no way of knowing whether they
actually meant 21:00 GMT or 22:00 GMT.