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{{Use mdy dates|date=May 2022}}

This page collects positions of the UK's National Physical Laboratory on the relationship among GMT, UTC, UT1, and related timescales. "The World Time System" seems to be oriented toward a popular audience. It states " In effect, the seconds of Universal Time (UT1, as GMT is now officially known) vary a little in length in order to keep in step with the changes in the Earth's rotation. This makes UT1 an imprecise method of keeping time."{{harv|World Time System | 2011}}

A similar page about leap seconds states "In effect, the length of the seconds of Universal Time (UT1, as GMT is now officially known) varies slightly to keep in step with the changes in the Earth's rotation."{{harv|Leap Second|2016}}

A paper submitted to the ITU/BIPM Workshop on the Future of the International Time Scale in connection with the debate about abolishing leap seconds contains the following bullet points:

:*UK laws refer to Greenwich Mean Time GMT{{Cite news |last=Doyne |first=Shannon |date=2016-11-07 |title=Would Life Be Better Without Time Zones? |language=en-US |work=The New York Times |url=https://www.nytimes.com/2016/11/07/learning/would-life-be-better-without-time-zones.html |access-date=2022-05-31 |issn=0362-4331}}

::*UT1 is the modern form of GMT{{Cite journal |last1=Cleveland |first1=William S. |last2=Devlin |first2=Susan J. |date=September 1982 |title=Calendar Effects in Monthly Time Series: Modeling and Adjustment |url=http://www.tandfonline.com/doi/abs/10.1080/01621459.1982.10477841 |journal=Journal of the American Statistical Association |language=en |volume=77 |issue=379 |pages=520–528 |doi=10.1080/01621459.1982.10477841 |issn=0162-1459}}

::*UTC provides an adequate representation of ‘GMT’ {{harv|Whibberley|2013}}

A description{{Cite news |last=Ferrell |first=Tom |date=1982-10-15 |title=2D CYCLE OF 400 YEARS BEGINS FOR THE GREGORIAN CALENDAR |language=en-US |work=The New York Times |url=https://www.nytimes.com/1982/10/15/us/2d-cycle-of-400-years-begins-for-the-gregorian-calendar.html |access-date=2022-05-31 |issn=0362-4331}} of a time and frequency radio station states "The timing of these edges is governed by the seconds and minutes of Coordinated Universal Time (UTC), which is always within a second of Greenwich Mean Time (GMT)." {{harv| NPL Time & Frequency Services| 2006}}

{{death date and age |1969|02|28 |1904|02|29 |df=yes}}

Example of difficulty in automating date conversion

I'll reply to Austronesier's post in the previous thread because it is more germane to this thread. In the archived threads I referenced earlier in this thread, it came up that none of the automation could handle a passage like this:

The Metre Convention was signed on May 20, 1875; it was based on earlier informal cooperation among several nations.

If it were converted to MDY format in a mechanical way, without complex analysis of the context, it would probably come out like

The Metre Convention was signed on May 20, 1875,; it was based on earlier informal cooperation among several nations. (boldface for emphasis of error)

It's possible, with careful coding, to represent dates according to the preference of the reader when the computer program is writing the entire passage around the date. But no one has put forward code that can convert date formats properly in the midst of editor-written text. Jc3s5h (talk) 16:11, April 22, 2022 (UTC)

Conversion and infobox example

Input:

{{convert|365.256363004|d|yr|comma=gaps|abbr=on|lk=out|disp=x|
(|j)}}

Result:

{{convert|365.256363004|d|yr|comma=gaps|abbr=on|lk=out|disp=x|
(|j)}}

Works cited

  • {{cite journal |last1=Aries |first1=Myriam B. C. |last2=Newsham |first2=Guy R. |name-list-style=amp |date=2008 |title=Effect of daylight saving time on lighting energy use: a literature review |url=http://archive.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc49212/nrcc49212.pdf |journal=Energy Policy |volume=36 |issue=6 |pages=1858–1866 |doi=10.1016/j.enpol.2007.05.021 |access-date=October 18, 2013}}
  • {{cite journal |last1=Aries |first1=Myriam B. C. |last2=Newsham |first2=Guy R. |name-list-style=amp |date=2008 |title=Effect of daylight saving time on lighting energy use: a literature review |url=http://archive.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc49212/nrcc49212.pdf |journal=Energy Policy |volume=36 |issue=6 |pages=1858–1866 |doi=10.1016/j.enpol.2007.05.021 |access-date=October 18, 2013}}
  • {{citation |last1=Aries |first1=Myriam B. C. |last2=Newsham |first2=Guy R. |name-list-style=amp |date=2008 |title=Effect of daylight saving time on lighting energy use: a literature review |url=http://archive.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrcc49212/nrcc49212.pdf |journal=Energy Policy |volume=36 |issue=6 |pages=1858–1866 |doi=10.1016/j.enpol.2007.05.021 |access-date=October 18, 2013}}
  • {{Cite web| title = The World Time System| date = October 26, 2011 | accessdate = January 21, 2019| url = http://www.npl.co.uk/educate-explore/what-is-time/the-world-time-system | ref = {{harvid | World Time System | 2011 }} }}
  • {{Cite web| title = The Leap Second | accessdate = January 21, 2019| url = http://www.npl.co.uk/educate-explore/what-is-time/the-leap-second | date = May–June 2016 | ref = {{harvid |Leap Second | 2016}} }}
  • {{cite report | last1 = Whibberley | first1 = Peter | date = September 19, 2013 | title = The future of UTC – a British perspective | url = https://www.itu.int/dms_pub/itu-r/oth/0a/0e/R0A0E0000960014PDFE.pdf | publisher = International Telecommunications Union }}
  • {{cite report | date = July 2006 | title = NPL Time & Frequency Services: MSF 60 kHz Time and Date Code| url = http://www.npl.co.uk/upload/pdf/MSF_Time_Date_Code.pdf | ref= {{harvid | NPL Time & Frequency Services | 2006}} }}
  • {{Cite book| edition = 3| publisher = Univ Science Books| isbn = 978-1-891389-85-6| editor1-first=Sean E. | editor1-last = Urban| editor2-first = P. Kenneth | editor2-last = Seidelmann| title = Explanatory Supplement to the Astronomical Almanac| location = Mill Valley, CA| date = 2013}}
  • {{Cite book| website = Nonsense |edition = 3| publisher = Univ Science Books| isbn = 978-1-891389-85-6| editor1-first=Sean E. | editor1-last = Urban| editor2-first = P. Kenneth | editor2-last = Seidelmann| title = Explanatory Supplement to the Astronomical Almanac| location = Mill Valley, CA| date = 2013}}
  • {{Cite web| last1 = Bozo| title = The Leap Second | accessdate = January 21, 2019| url = http://www.npl.co.uk/educate-explore/what-is-time/the-leap-second | date = July 25, 2016 | ref = {{harvid |Leap Second | 2016}} }}
  • {{Cite web| last1 = Eligon| first1 = John| last2 = Barry| first2 = Ellen| last3 = Weise| first3 = Karen| title = Forfeited Games and Virtual Learning: Coronavirus Shuts Down Schools - The New York Times| website = The New York Times| accessdate = March 8, 2020| date = March 8, 2020| url = https://www.nytimes.com/2020/03/08/us/coronavirus-schools-san-francisco-seattle.html?action=click&module=Top%20Stories&pgtype=Homepage}}
  • {{cite news |url=http://nla.gov.au/nla.news-article61732819 |title=TRUMP. |newspaper=Townsville Daily Bulletin |volume=LV |issue=205 |location=Queensland, Australia |date=28 August 1933 |accessdate=29 October 2022 |page=10 |via=National Library of Australia}}
  • {{cite news | title = London Gazette | date = 29 February 1700}}
  • {{cite news | title = Test | newspaper = Dirt Journal | date = 29 February 1500}}