Talk:List of UTC offsets

message: Does anyone know how the :30 and :45 time zones affect the presence of a certain hour?no
For instance, if it is noon GMT, will it be noon in Alaska nine hours later (9:00GMT) and then noon in French Polynesia a half-hour after that (9:30GMT)?--99.251.89.115 (talk) 21:51, 19 October 2008 (UTC)
thread_title: Untitled

message: This is a pretty nice list. If we add some references, we should nominate it as a featured list. Chanheigeorge 23:20, 3 May 2006 (UTC)
replies: text: When this list was split off from time zone, the principal written references were left behind, the CIA and NAO maps. Even so, they are usually badly outdated, taking as much as ten years to reflect changes made by any government. Thus, individuals in the affected countries are much more important than any written source. This is contrary to the references cited by most articles which must be published. — Joe Kress 05:30, 15 May 2006 (UTC)

text: I second that, I was looking to nominate it just now, but I see there's unresolved issues. I'll be working on getting some corroborative sources over the next couple of days. Cheers Festrilmongrit (talk) 15:29, 18 June 2009 (UTC)

text: At first glance, Time Genie appears to get its information from Wikipedia, which it cites for more information. It even lists its 'countries' with Wikipedia idiosyncracies, such as alternative names. Furthermore, Time Genie does not give any time zone info—it only gives the current time in the selected country, from which the reader has to mentally derive the time zone. — Joe Kress 05:30, 15 May 2006 (UTC)
replies: text: how do you come to the conclusion that tg may get the info from wp? Tobias Conradi (Talk) 01:24, 23 May 2006 (UTC)
thread_title:  Featured list? 

message: Does anyone know what time is used in Arctic and Antarctica? Dali 19:09, 19 June 2007 (UTC)
replies: text: Each country in the Arctic determines its own time. Antarctic stations generally keep the time of their supply bases. For example, the Amundsen-Scott South Pole Station keeps New Zealand time, including its daylight saving time of UTC+13 in the southern summer, even though all ideal time zones converge at the South Pole. — Joe Kress 04:28, 21 June 2007 (UTC)
thread_title:  Arctic and Antarctica 

message: So if someone told me to call them at 9 PM in England, does that mean 1 PM in California or 2 PM? Thank you. 71.243.206.213
:California has UTC-8 and UK has UTC (both with daylight saving time), so the time difference is 8 hours most of the year. 9 PM in England is 1 PM in California. This is not valid around the time of start and stop of daylight saving time. Then it is hard to calculate it, see Daylight saving time around the world. -- BIL 07:23, 5 August 2007 (UTC)
thread_title:  GMT to PST 

message: Great idea, but does every single time zone need four representative cities listed?  One for Nepal, Afghanistan, etc. should suffice.  —Preceding unsigned comment added by 98.199.120.129 (talk) 15:55, 16 October 2007 (UTC)
thread_title:  Principal cities 

message: There are various mentions of places which have recently changed Time Zone - I've spotted Chihuahua, Venezuela, Georgia, Sri Lanka, Nepal, Kyrgyzstan, Taiwan, Peninsular Malaysia, Singapore, Marshall Islands, Phoenix Islands, Line Islands.  I suggest that it would be well to have a separate list on this page for those and any other reasonably recent (or future) changes; the details in the main list could be replaced by links to that.
There are a few cases where territories have changed from one side of the Date Line to the other, thereby losing or gaining a day. That's of particular interest, and deserves its own list of all known changes however long ago.  Alaska 1867, Marshall Islands, Phoenix Islands, Line Islands, at least.
Having separate lists will make omissions more obvious and more likely to be corrected.
82.163.24.100 17:48, 4 November 2007 (UTC)
thread_title:  Changes of Zone - Time & Date 

message: The article says, "This gives the interesting feature that during one hour each day there are three different dates in use on land around the world." This statement is certainly correct, but I think it doesn't clearly and fully convey how screwed up time zones are. For one thing, I think the "on land" qualifier may be unfairly ignoring "UTC-12: Ships at sea within 7.5° east of 180° and United States Minor Outlying Islands." If we count those people, then aren't there three dates coexisting for a full two hours each day? Another implication of this which isn't clearly mentioned is that there are always at least two dates in use on the surface of the Earth, and there are always at least three time zones using a different date than the majority of world.
Also of note, if we simply didn't have the time zones UTC+12, +13, and +14, then we could still accurately represent the time of day in all parts of the world, but there would never be three dates simultaneously coexisting, and for one full hour each day the entire planet would share a single date.Fluoborate (talk) 19:04, 23 October 2008 (UTC)
thread_title:  Are there two full hours of three-dates-coexisting? 

message: I'm not sure if this is the right place to get attention for this, but it's a start: I came upon UTC+1 via Special:Randompage earlier, and noticed that it didn't actually say what "UTC+1" means.
I went to fix it, but then realised I'd have to fix over 24 other articles; except they're not all the same. And then I realised that there are articles for each time zone (e.g. Central European Time) as well as each time offset (e.g. UTC+1). And then I found this list, which actually has the information fairly well organised.
So:
# What information should be in pages on named time zones (e.g. Central European Time)? Political, cultural, and historical spring to mind.
# What information should be in pages on time offsets; as far as I can see, these will only ever be the lists of time zones in that offset. In which case,
# Do we need both this list and a separate article for each offset?
And am I even making that distinction correctly, since none of the pages seem to... - IMSoP (talk) 01:46, 26 October 2008 (UTC)
thread_title:  Articles on time zones and time offsets 

message: A discussion has been started at Wikipedia talk:WikiProject Countries/Lists of countries which could affect the inclusion criteria and title of this and other lists of countries.  Editors are invited to participate. Pfainuk talk 12:07, 17 December 2008 (UTC)
thread_title: New Discussion

message: Someone posted Legal Time 2010 (as of 15 April) at List of country calling codes; while the list is from the ITU, it is just a list of time zones for various countries/regions and has nothing to contribute to that list. But it may be useful as a source here. Anomie⚔ 03:44, 3 May 2010 (UTC)
thread_title:  Potentially useful link 

message: This is a list of geographic areas by UTC offset. TZ master (talk) 12:39, 7 October 2011 (UTC)
thread_title:  Not a list of time zones 

message: Why have the * and ** indicators been removed from virtually all of the regions in the list? This information was present on the English page before, and is still there on other language pages. It is still documented in the page description:
:Regions marked with asterisks (* or **) observe daylight saving time: add one hour in summer (* for Northern Hemisphere summer; ** for Southern Hemisphere).
What possible justification is there for removing this useful information?
--67.215.46.59 (talk) 18:11, 22 March 2012 (UTC)
replies: text: I think the article would be too cluttered if all the DST information was included. Perhaps an article like List of countries using Daylight Saving Time would be useful to cover the topic? Eldumpo (talk) 21:52, 29 January 2013 (UTC)
replies: text: The article would not be cluttered by the presence of * and ** because only those symbols were present in the original article — no other information was or will be provided, such as which days of the year DST begins and ends. For that info see Daylight saving time by country. — Joe Kress (talk) 23:44, 29 January 2013 (UTC)
thread_title:  Removal of daylight savings time indicators 

message: Not seeing any particular method or pattern to which cities were chosen (other than being capitals), I added the capital (or commercial capitals) of countries that were not represented. Now, another user has come along and deleted at least some of those, leaving the selection particularly short of African cities. What should be the criteria for the list? How about country capital or commercial capital and population more than x (to be determined)? —[AlanM1 (talk)]— 09:24, 8 July 2012 (UTC)
replies: text: My view is that the principal cities section should be a relatively short list outlining the largest few cities in each offset, with ideally only one city per country. It should not be listing every capital city within the zone. Eldumpo (talk) 13:05, 8 July 2012 (UTC)
replies: text: I've added some text to the article providing some steer on the inclusion of principal cities, concentrating on not having too many. There's no need for the article to have a long list of cities; these can mostly be easily deduced from the country/region. Eldumpo (talk) 08:22, 21 October 2012 (UTC)
thread_title:  Which cities 

message: This article suffers from a confusing perspective. It lists time offsets, as if these were the same as time zones. I know that some websites take the same perspective, but I think this confuses the reader. 
A time offset is not the same as a time zone. The UTC time offset observed in a place is the amount of time subtracted from (or added to) Greenwich Time (aka UTC). Many localities in the English-speaking world also observe a daylight saving time by adding one hour from this offset. So they really have two time offsets. 
I'm not really sure if it's so good to have a list of UTC time offsets in addition to a list of time zones. Just having the time zone list would probably be a whole lot more clear for our readers. --Uncle Ed (talk) 21:31, 14 July 2012 (UTC)
replies: text: I think it's really useful to have a list of ordered time offsets, so readers can see at a glance what is in each zone. I agree there could be some confusion between time zones/offsets; the article was named differently until quite recently. I've added a note that this list deals with 'standard' time zones. The time zones list you pointed to was a dab page. Eldumpo (talk) 21:47, 23 July 2012 (UTC)
thread_title: Time zones and time offsets

message: The main problem occurs with western longitudes. Next to the top and the bottom edges of the map, the map gives UTC offsets (e.g. -5 for the time zone containing New York). But in the body of the map, one finds something that in the legend of the map is called the ″time zone number,″ and for the time zone containing New York, that number is 5 (i.e. +5). In the legend at the bottom, it says (for western longitudes), ″Add time zone number to local time to obtain UTC. Subtract time zone number from UTC to obtain local time." Now that's correct if one really uses the time zone number, i.e. the number indicated in the body of the map. The confusing part is that right above the legend, what one sees is not the time zone number, but rather the UTC offset, and, of course, if (for the time zones in the western hemisphere) one uses the UTC offset with the prescription given in the legend, one gets a wrong result. (There is no corresponding problem for time zones in the eastern hemisphere, because for them, their ″time zone numbers″ coincide with their UTC offsets.)
The second problem with ″time zone numbers″ is that they are not a unique identifiers for time zones: for every time zone in the western hemisphere with a given ″time zone number,″ there is a time zone in the eastern hemisphere with the same ″time zone number″ (e.g. the time zone containing New York in the U.S. and the time zone containing Karachi in Pakistan both have the same ″time zone number,″ namely 5).
The third problem is that with this system of ″time zone numbers,″ if one wants to convert from local time to UTC or vice versa, then one needs to use different formulas depending on whether one is interested in the time zones in the western hemisphere or in the eastern hemisphere. This is evident from the legend. In contrast, one and the same formula using UTC offsets is valid for time zones in both hemispheres: ″UTC″ = ″local time in a zone″ - ″UTC offset for that zone″. The only problem with that (if it is a problem at all) is that one needs to know how to do arithmetic with negative numbers (e.g., in the winter, the UTC offset for New York's time zone is -5, so when it's 15:47:00 in New York in the winter, the UTC time is computed as 15:47:23 - (-5:00) = 20:47:23 UTC). In the system used in the map, one only ever does arithmetic with positive numbers.
The fourth problem is that it is unclear what reputable source uses this kind of ″time zone numbers.″ This map, and some similar to it, can be found at the University of Texas at Austin library online map collection, here. Indeed, the map under discussion seems to be precisely this map. Note, however, that in maps from 2005 and earlier, the numbers shown next to the top and the bottom edges of the map are not the UTC offsets but rather the ″time zone numbers,″ so the main problem discussed above does not occur. However, the remaining problems are still there. In particular, it is not clear who or what produced these maps. On the other hand, reputable sources I was able to find do not use this system of ″time zone numbers.″ One reputable source, the 2002 edition of Bowditch's American Practical Navigator, uses positive numbers for the western hemisphere, and then continues with negative numbers in the eastern hemisphere (e.g. New York's time zone is labeled ″5″, while Karachi's is labeled ″-5″). To see this, download Chapter 18 (″Time″) here, and look at the map in Fig. 1806 on p. 279. This is consistent with the U.S. Navy manual available here. Other systems (arguably) use the UTC offsets as designators for time zones, e.g. here and here. Still other systems do not use number designators at all. For example, this map, on which it says that it was ″Compiled by HM Nautical Almanac Office,″ uses only letter designators.
How best to resolve these problems would seem to depend on how one resolves the confusion between the concepts of ″UTC time offset″ and ″time zone,″ and between the concepts of ″standard time″ and "standard time zone"; this confusion is discussed  here. However, as a temporary resolution, one could simply follow what seems to be the natural instinct and use the UTC offsets as time zone numbers. This would require two rather easy modifications of the map: 1. adding the minus signs in front of the ″time zone numbers″ in the body of the map in the western hemisphere, and 2. appropriately changing the conversion recipe in the legend. Reuqr (talk) 10:28, 25 September 2012 (UTC)
replies: text: The map in this article is derived from the map entitled Standard Time Zones of the World published periodically by the Central Intelligence Agency  (row 5, col 3, 10-12). As you note, the University of Texas library has several versions online. The latest versions have negative time zone numbers along the top and bottom edges of the Western hemisphere, but not within the countries themselves. The left-hand note is wrong when applied to the edge numbers, but correct when applied to the country numbers of the Western hemisphere. To avoid confusion, all country numbers in the Western hemisphere should have minus signs to match the numbers on the top and botton edges, and the left-hand note should be removed, leaving only the correct right-hand note. — Joe Kress (talk) 23:37, 5 February 2013 (UTC)
thread_title: Problems with the ″time zone number″ notation on the Standard Time Zones Map

message: It's confusing. I recommended tabulating the list. I'd recommend the columns go something like 1) Time offset, 2) Specific place experiencing it, 3) where place is in the world (country, state/province), 4) reference. You should be able to remove the note altogether than. But i will leave it up editors more failure with this topic to hash it out, I'm just a list expert. Dkriegls (talk to me!) 11:26, 6 August 2014 (UTC)
replies: text: OK, I note someone else has found the current format confusing. Maybe a list could work but if the columns were done as above then for each offset all the places under the same country should be listed consecutively, but will some entries need another column to sufficiently detail matters. Maybe a 5th column for notes/comments. Also, what happens for sovereign countries in 1 time zone - the 2nd column would be blank or duplicate the 3rd?  Maybe someone could do a trial list format to see how things look?  Eldumpo (talk) 06:19, 7 August 2014 (UTC)
replies: text: Personally I don't think a table would work so well; it would be more fussy and awkward to read (for what is, for a large part, essentially just a simple list of countries) and would take away the flexibility that the indentation system gives us. My main objection is just that, when the indentation system is used, those lines whose scope is going to be restricted by subsequent lines ought to be worded in some way that makes clear that this is the case; it isn't natural for the human eye/brain to interpret a line differently purely on the basis that it's followed by a further indented line. Just adding a colon to those lines would be of some help, though for better clarity I think there should also be additional wording like "In..." Also, it doesn't seem natural to list everything under "ultimate sovereign country", when it's a distinct territory rather than just a designated time zone integrally within the country.  W. P. Uzer (talk) 06:03, 8 August 2014 (UTC)
thread_title: Tabulating ideas

message: Where is Connecticut on this list?   Thanks.   Joseph A. Spadaro (talk) 16:00, 22 September 2014 (UTC)
thread_title:  Missing Areas 

message: These edits are by a suspected vandalism-only account. But the addition of Malé looks OK to me so I've corrected it. Feel free to revert my edit if I have it wrong, and of course the others if in fact they are also wrong. Or even revert my edit if it just makes it easier to fix the damage, it's easily redone. TIA Andrewa (talk) 07:08, 10 October 2018 (UTC)
thread_title:  Possible vandalism 

message: The following Wikimedia Commons file used on this page has been nominated for deletion:
* 
Participate in the deletion discussion at the . —Community Tech bot (talk) 16:08, 25 November 2018 (UTC)
thread_title:  A Commons file used on this page has been nominated for deletion 

message: you have several times added a bunch of cities, and moved away from alphabetical order in the lists, without so much as an edit summary to say why.  You have been reverted thrice now.  Please take this opportunity to say why you think this improves the article, or refrain. Dicklyon (talk) 16:08, 2 March 2019 (UTC)
replies: text: Thank you for belatedly adding summaries to your edits although you seem to have re-added all of the items that were subject of the reversions. Please note that the long-standing consensus is that each time zone should have a maximum of one city per country, not all countries need to have a city listed and not all time zones need to have cities listed; it is supposed to be a high-level overview of the largest cities. I have made a number of changes to the article, including returning time zone entries that reflect sources. Please do not continue to re-add disputed information without discussion. Thanks.  Eldumpo (talk) 17:48, 6 March 2019 (UTC)

text: It’s supposed to be just a quick overview of key cities, not a large number. We don’t need to show both capital and biggest city. I’m not convinced it’s needed at all, maybe best it should follow a source. Eldumpo (talk) 21:37, 16 March 2019 (UTC)

text: Thanks for engaging at talk. Please can you add a citation for this and the Kazakhstan claim. Eldumpo (talk) 21:41, 16 March 2019 (UTC)

text: Seriously, Delhi is small?  Is there not some other criterion for "principal" other than size? Dicklyon (talk) 01:21, 17 March 2019 (UTC)

text: I don’t see why daylight saving is an issue; the list is not showing daylight saving but standard time. Eldumpo (talk) 23:32, 16 March 2019 (UTC)

text: While Daylight Saving Time does place these cities at UTC-04:00, I think it would be better to choose as principal cities those that are in UTC-04:00 due to Daylight Saving Time.  Are there significant deviations from this idea already?  Dicklyon (talk) 01:26, 17 March 2019 (UTC)
replies: text:  I’m unsure if there is a 'not' missing from your post. However, there is a note in the article saying that countries should be listed according to their standard zone not DST, and we could explicitly say this applies to the cities that are listed as well. Eldumpo (talk) 23:39, 19 March 2019 (UTC)
replies: text: Sorry, I meant "those that are in UTC-04:00 due to Standard Time".  I agree with you. Dicklyon (talk) 03:33, 20 March 2019 (UTC)

text: Nuuk is tiny and as per the notes not all countries/time zones need have a city listed. Eldumpo (talk) 23:40, 19 March 2019 (UTC)

text: Following those individual time zone articles shouldn’t be the basis for what this article does, maybe instead they should change? Perhaps we should consider using tz or World Time Zone although this should be agreed before changes are made. Eldumpo (talk) 14:28, 16 June 2019 (UTC)
thread_title:  Adding and re-ordering cities 

message: I think there should be sometimes two principal cities in in a few time zones like UTC+10:00, UTC+08:00, UTC+05:30, UTC-07:00 and UTC-09:00 because China in UTC+08:00 has Shanghai as its largest city and Beijing as its capital, India in UTC+05:30 has Delhi as its largest state and Kolkata is the 6th largest city, Phoenix is the largest city in UTC-07:00 but does not use daylight saving time but Denver is the second largest city in the U.S.A in this time zone and uses daylight saving time and Alaska in UTC-09:00 has Anchorage as its largest city and Juneau as its capital city. 
Lachlb (talk) 09:32, 15 March 2019 (UTC)
replies: text: It’s supposed to be just a quick overview of key cities, not a large number. We don’t need to show both capital and biggest city. I’m not convinced it’s needed at all, maybe best it should follow a source. Eldumpo (talk) 21:37, 16 March 2019 (UTC)
thread_title:  Why there should sometimes be two principal cities 

message: São Tomé and Principe has changed its local time back again to Greenwich Mean Time. Lachlb (talk) 09:33, 15 March 2019 (UTC)
replies: text: Thanks for engaging at talk. Please can you add a citation for this and the Kazakhstan claim. Eldumpo (talk) 21:41, 16 March 2019 (UTC)
thread_title:  São Tomé and Principe time zone 

message: Kyzylorda in Kazakhstan changed time zone from UTC+06:00 to UTC+05:00 Lachlb (talk) 09:34, 15 March 2019 (UTC)
thread_title:  Kyzylorda, Kazakhstan time zone 

message: I think there should be two principal cities in UTC+13:00 because Apia, Samoa is the largest city in this time zone and Nuku’alofa, Tonga is the second largest city in this time zone.
I think there should be two principal cities in UTC-01:00 because Praia, Cabo Verde is the largest city in this time zone and Ponta Delgada Portugal is the second largest city in this time zone.
I think there should be one principal city in UTC-03:30 because St. John’s, Newfoundland and Labrador, Canada is the largest city in this time zone.
I think there should be one principal city in UTC-11:00 because Pago Pago, American Samoa is the largest city in this time zone Lachlb (talk) 09:47, 15 March 2019 (UTC)
thread_title:  Why there should be principal cities in UTC+13:00, UTC-01:00, UTC-03:30 and UTC-11:00 

message: I think Mumbai and Kolkata should be principal cities in UTC+05:30 because Mumbai is the largest city in India and Kolkata is the sixth largest city in India and I don’t think Delhi should be a principal city because it’s too small. Lachlb (talk) 09:51, 15 March 2019 (UTC)
replies: text: Seriously, Delhi is small?  Is there not some other criterion for "principal" other than size? Dicklyon (talk) 01:21, 17 March 2019 (UTC)
thread_title:  UTC+05:30 principal cities 

message: I think Cuiabá and Asunción should be principal cities in UTC-04:00 because they use daylight saving time. Lachlb (talk) 10:15, 16 March 2019 (UTC)
replies: text: I don’t see why daylight saving is an issue; the list is not showing daylight saving but standard time. Eldumpo (talk) 23:32, 16 March 2019 (UTC)

text: While Daylight Saving Time does place these cities at UTC-04:00, I think it would be better to choose as principal cities those that are in UTC-04:00 due to Daylight Saving Time.  Are there significant deviations from this idea already?  Dicklyon (talk) 01:26, 17 March 2019 (UTC)
replies: text:  I’m unsure if there is a 'not' missing from your post. However, there is a note in the article saying that countries should be listed according to their standard zone not DST, and we could explicitly say this applies to the cities that are listed as well. Eldumpo (talk) 23:39, 19 March 2019 (UTC)
replies: text: Sorry, I meant "those that are in UTC-04:00 due to Standard Time".  I agree with you. Dicklyon (talk) 03:33, 20 March 2019 (UTC)
thread_title:  UTC-04:00 principal cities 

message: I think Nuuk should be a principal city in UTC-03:00 because it uses daylight saving time and I also think Luanda, Algiers and Vienna should be principal cities in UTC+01:00 because Luanda and Algiers have over 3 million people and Vienna is the world’s most liverable city Lachlb (talk) 10:19, 16 March 2019 (UTC)
replies: text: Nuuk is tiny and as per the notes not all countries/time zones need have a city listed. Eldumpo (talk) 23:40, 19 March 2019 (UTC)
thread_title:  UTC-03:00 and UTC+01:00 principal cities 

message: I think there should sometimes be two or more principal cities because my argument is only being one city per country is because it doesn’t match other time zone related articles, so I believe there should be two or more cities because my argument is it improves the article more by matching more related time zone articles. Lachlb (talk) 22:57, 15 June 2019 (UTC)
replies: text: Following those individual time zone articles shouldn’t be the basis for what this article does, maybe instead they should change? Perhaps we should consider using tz or World Time Zone although this should be agreed before changes are made. Eldumpo (talk) 14:28, 16 June 2019 (UTC)
thread_title:  Why there should sometimes be two or more principal cities 

message: Hi Dicklyon and Eldumpo, I live in Melbourne, Victoria, Australia, I have studied Time all around the world and I was trying to help fix the Wikipedia up for you because I found out the Turks and Caicos Islands reintroduced Daylight saving time by setting the clocks back 1 hour to Eastern Standard time on November 4, 2018, Kyzylorda changed time zone to from UTC+06:00 to UTC+05:00 on 21, December 2018 and São Tomé and Principe changed its time zone back to UTC+00:00 on January 1, 2019, I found out all of this information on the timeanddate app.
I have also found out that Calgary is the largest city in Alberta and has got more people than Edmonton that is why I have put Calgary as principal city in UTC-07:00 instead of Edmonton, Mumbai is the largest city in India and Delhi is just a state that is why I have put Mumbai as a principal city in UTC+05:30 instead of Delhi, Shanghai is the largest city in China and has got more people than Beijing that is why I have put Shanghai as a principal city in UTC+08:00 instead of Beijing, I have added Macau as a country in UTC+08:00 because it’s also a country in UTC+08:00 and I have found out that the real time zone in Russia in UTC+11:00 is Magadan Time, that is why I have put Magadan Time instead of Srednekolymsk Time.
I have also added Managua, San Salvador and Tegucigalpa to UTC-06:00 in order to match the article UTC-06:00.
I have also added Asunción as a principal city to UTC-04:00 in order to match the article UTC-04:00, and I have also added Algiers, Luanda and Vienna as principal cities to UTC+01:00 in order to also match the article UTC+01:00.
I have also sorted out the principal cities in UTC+01:00 and UTC+00:00 from European cities first as principal cities from largest to smallest by population then African cities from largest to smallest by population.
I have also sorted out UTC-05:00 principal cities from American cities first from largest to smallest by population then Caribbean cities from largest to smallest by population and then I’ve sorted out South American principal cities from largest to smallest by population.
Thank you for your letters about my proposed changes to this article. Lachlb (talk) 10:48, 6 May 2019 (UTC)
replies: text: There is an offical source on time zones and principal cities. It is called tz database. This source is used by several opeating systems like Android and Unix. This database is listed in List of tz database time zones. For Mountain time in Canada it is Edmonton, the state capital. This way we can use a source to what is principal cities in the time zones (usually one per country and for countries with multiple time zones or historically after 1970 multiple time zones, one per time zone in the country). And don't have to argue on personal opinions or personal criteria. And Lachlb, don't edit that list, because it is based on an external database.--BIL (talk) 09:22, 12 May 2019 (UTC)

text: You comments didn't really respond to BIL's note.  Please say whether your changes are in line with the official source he showed, and if not why not. Dicklyon (talk) 16:01, 18 May 2019 (UTC)

text: You didn’t add a reference, but in any case this article is only showing the standard (non-DST) position. Eldumpo (talk) 14:25, 16 June 2019 (UTC)
replies: text:  I see that the change is not just DST so I have changed it back with a reference. Please add citations directly within the text. Eldumpo (talk) 08:01, 17 June 2019 (UTC)
thread_title: Recent efforts to improve coverage of principal cities, etc.

message: Not all of mainland Chile is in UTC-04:00 because the Magallanes Region is on UTC-03:00 year round since 2016 according to various time zone apps.
I have also added a reference supporting my changes to the time zones. Lachlb (talk) 07:32, 16 June 2019 (UTC)
replies: text: You didn’t add a reference, but in any case this article is only showing the standard (non-DST) position. Eldumpo (talk) 14:25, 16 June 2019 (UTC)
replies: text:  I see that the change is not just DST so I have changed it back with a reference. Please add citations directly within the text. Eldumpo (talk) 08:01, 17 June 2019 (UTC)
thread_title: [[Chile]] time zones

message: I just corrected South Africa time zone by saying expect Prince Edward Islands in front of it in UTC+02:00. Lachlb (talk) 04:43, 22 June 2019 (UTC)
thread_title: South Africa time zones

message: I have just sorted some countries provinces and states in alphabetical order. Lachlb (talk) 04:43, 22 June 2019 (UTC)
thread_title: I just sorted out the states of country’s in alphabetical order

message: The reason why I have put Calgary as a principal city in UTC-07:00 instead of Edmonton because Calgary has more than 1 million people and Edmonton doesn’t. Lachlb (talk) 05:40, 22 June 2019 (UTC)
thread_title: Why I have put [[Calgary]] as a principal city in [[UTC-07:00]] instead of [[Edmonton]]

message: An editor using at least 2 different IP addresses has been cluttering the list up with flags and with countless minor locations.  These edits do not seem to be an improvement.  --David Biddulph (talk) 07:29, 18 August 2021 (UTC)
replies: text: I agree these were not an improvement. Good reversion. Eldumpo (talk) 07:47, 19 August 2021 (UTC)
replies: text:  More IP addresses, doubtless socks of the already blocked IPs, are swamping the pages for each time zone with a ludicrous number of examples of locations.  Is there a consensus for these changes? --David Biddulph (talk) 11:15, 31 August 2021 (UTC)
thread_title:  Clutter from IP