The "Time Lords" subcommittee has released yet another study. Find it at: https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/15/15.pdf Article on Yahoo News: https://www.yahoo.com/news/eu-clock-changes-uk-implications-164042321.html
On 2/11/20 5:36 PM, Chris Woodbury wrote:
The "Time Lords" subcommittee has released yet another study. Find it at:
https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/15/15.pdf
Thanks for the heads-up. Our estimate of one year's lead time was at the low end for their witnesses; the IATA and Jonathan Skeet both suggested two years. The Time Lords compromised by suggesting 18 months (see page 14). More importantly, they mentioned us on page 22 as being the only witness commenting on a potential time border between Northern Ireland and Great Britain, a possibility that the British government seems to have largely overlooked. They also mentioned us at some length on page 25 about how to best implement UTC+1 year-round in the UK.
On 2020-02-12 01:57, Paul Eggert wrote about the study from the House of (Time) Lords:
On 2/11/20 5:36 PM, Chris Woodbury wrote:
The "Time Lords" subcommittee has released yet another study. Find it at:
https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/15/15.pdf ... They also mentioned us at some length on page 25 about how to best implement UTC+1 year-round in the UK.
In the IANA statement SCT0004 referenced on page 22, I read: >> The notion of permanent summertime is not supported by the POSIX.1-2017 >> standard[4], which covers most of the computer servers in the UK. This is correct in the sense that POSIX does not mention summer time -- but POSIX mentions "alternative (dst - such as Daylight Savings Time) timezone" in addition to standard time. And a TZ string may well specify that the "alternative" time is "permanent" (in the sense of being in force throughout the year), for instance with: EET-2/BST-1,J1/01:00,J365/24:00 so that POSIX does support permanent "alternative time zones". Hence it is not clear to me exactly which unsupported feature of POSIX is meant in the quote above. Michael Deckers.
On 2/14/20 3:01 PM, Michael H Deckers wrote:
a TZ string may well specify that the "alternative" time is "permanent" (in the sense of being in force throughout the year), for instance with: EET-2/BST-1,J1/01:00,J365/24:00
Good point; I hadn't thought about the possibility of using negative DST to specify permanent daylight saving time. Unfortunately, this TZ setting does not work in recent GNU/Linux systems, like Fedora 31: $ TZ=EET-2BST-1,J1/01:00,J365/24:00 date -d@1577833199 Tue Dec 31 23:59:59 BST 2019 $ TZ=EET-2BST-1,J1/01:00,J365/24:00 date -d@1577833200 Wed Jan 1 01:00:00 EET 2020 Also, we know that many Java systems do not support negative DST. So even though the specific phrase quoted in the House of Lords document is incorrect, it's still the case that many practical systems don't support permanent DST.
Interesting that it mentioned time is one of the reserved matters for Scotland. That mean rest of the United Kingdom can choose to abolish DST like rest of Europe while Scotland can choose to keep it? On the other hand Scotland could also choose to abolish DST and align with rest of Europe while rest of the United Kingdom choose to keep it? On 2020-02-12 Wed 09:37, Chris Woodbury via tz <tz@iana.org> wrote:
The "Time Lords" subcommittee has released yet another study. Find it at:
https://publications.parliament.uk/pa/ld5801/ldselect/ldeucom/15/15.pdf
Article on Yahoo News:
https://www.yahoo.com/news/eu-clock-changes-uk-implications-164042321.html
On 12 Feb 2020, at 03:49, Phake Nick <c933103@gmail.com> wrote:
Interesting that it mentioned time is one of the reserved matters for Scotland. That mean rest of the United Kingdom can choose to abolish DST like rest of Europe while Scotland can choose to keep it? On the other hand Scotland could also choose to abolish DST and align with rest of Europe while rest of the United Kingdom choose to keep it?
No to both. Reserved means reserved to Westminster. Think of it as the opposite of devolved. Peter Ilieve
participants (5)
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Chris Woodbury -
Michael H Deckers -
Paul Eggert -
Peter Ilieve -
Phake Nick