GMT +1 is not Greenwich Mean Time

I think it means that the current time in these cities is GMT + 1, like when Summer Time is is effect.

You misunderstand

The legend is telling you that London is currently at GMT plus 1 hour (because of Summer Time)

Just like Paris is GMT + 1, the reference is GMT (or UTC as it is now) PLUS 1 hour

FWIW, I think Clive is right. In "(GMT+1:00) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London" either "Greenwich Mean Time" should be removed or changed to "British Summer Time" or some other label when appropriate.

Labels schmabels 🙂

You have a point but I have no issue with describing Londons Summer Time as GMT + 1, or indeed the Winter Time as GMT

Anyhow, it's UTC now

And here is why UTC is used instead of GMT (oh the search for split second accuracy, and credits to WikiP for not having to type this out)

"Historically the term GMT has been used with two different conventions for numbering hours. The long-standing astronomical convention dating from the work of Ptolemy, was to refer to noon as zero hours (see Julian day). This contrasted with the civil convention of referring to midnight as zero hours dating from the Romans. The latter convention was adopted on and after 1 January 1925 for astronomical purposes as well, resulting in a discontinuity of 12 hours, or half a day earlier. The instant that was designated December 31.5 GMT in 1924 almanacs became January 1.0 GMT in 1925 almanacs. The term Greenwich Mean Astronomical Time (GMAT) was introduced to unambiguously refer to the previous noon-based astronomical convention for GMT.^[6] The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as zero hours."

December 31 and a half?

Must have been a fun night 🙂

I don't. I think Csound is right.

The time here is currently GMT+1 = BST.

BST ends October 29, after which I will reset my time zone to GMT.

GMT is a fixed constant and all agreed time zones are a +/- variant thereof, which will vary according to when/if certain countries have artificial 'Summer Time'.

Only in Britain is this called 'British Summer Time' so your suggestion of relabelling would not work.

Klaus1 wrote:

I don't. I think Csound is right.

The time here is currently GMT+1 = BST.

BST ends October 29, after which I will reset my time zone to GMT.

GMT is a fixed constant and all agreed time zones are a +/- variant thereof, which will vary according to when/if certain countries have artificial 'Summer Time'.

Only in Britain is this called 'British Summer Time' so your suggestion of relabelling would not work.

Hey Klaus

Britain is the 0 point in the world (remember the Philadelphia Conference and be grateful that it's not PMT + 10, or 11, wherever it is that Philly is)

It's all labelling, do you think the English Channel is known that way in Paris?

The time here is currently GMT+1 = BST.

Of course. But it isn't both "GMT+1:00" and "Greenwich Mean Time." That's Clive point.

Only in Britain is this called 'British Summer Time' so your suggestion of relabelling would not work.

Well, the whole thing is labeled in English, so I don't think relabeling it with a British convention would be that problematic, but if it is then just removing the "Greenwich Mean Time" from the line should be fine.

You do as you please i will refer to BST as GMT + 1

Csound1 wrote:

You do as you please i will refer to BST as GMT + 1

That is beside the point.

The point is that "GMT+1" can't be "Greenwich Mean Time" so both labels should not appear on the same line of the ASC preference.

You're right, but it is such a minor issue that I can't get riled about it, man made time has always been an exercise in labelling 🙂 so I don't sweat it.