Missing entry for Heard Island and MacDonald Islands
Hi everyone, I am a developer by trade, so I am not sure if I have stumbled onto some missing data in the tz database. I am accessing the database using PHP (www.php.net) which uses the latest version of the tz database (2012.3). I can use one of the built in functions to lookup timezone information for a given country using its ISO 3166-1 two letter country code (http://www.php.net/manual/en/datetimezone.listidentifiers.php). I am currently building an application and found that Heard Island and MacDonald Islands (ISO code HM) does not exist in the database. After a quick look at the tz data, I was also not able to find anything about Heard Island and MacDonald Island in the files. I believe that there should be an entry for Heard Island and MacDonald Islands (HM) which uses the timezone Australia/Perth. Is it possible that the entry was intentionally excluded for some reason? Or was it just missing from the database? Cheers,John
I had the same issue and I resolved it my using the zone "Etc/GMT-5".
From http://www.timegenie.com/country.time/hm: QUOTE To ensure accuracy of information, timegenie.com contacted the Australian Antarctic Division. On January 3, 2005, a senior official confirmed that Heard Island and McDonald Islands are UTC/GMT +5 hours. Additionally, since the islands are uninhabited, the islands do not observe daylight saving time. UNQUOTE
Kind regards, Paw --------------------------- DISCLAIMER: The information contained in this electronic message and in any attachments to this message is intended only for the person or entity to which this electronic message is addressed. If you are not the intended recipient, you are hereby notified that any distribution, copying, review, retransmission, dissemination or other use of this electronic transmission or the information contained in it is strictly prohibited. From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of dfg dfg Sent: 11 May 2012 10:52 To: tz@iana.org Subject: [tz] Missing entry for Heard Island and MacDonald Islands Hi everyone, I am a developer by trade, so I am not sure if I have stumbled onto some missing data in the tz database. I am accessing the database using PHP (www.php.net<http://www.php.net>) which uses the latest version of the tz database (2012.3). I can use one of the built in functions to lookup timezone information for a given country using its ISO 3166-1 two letter country code (http://www.php.net/manual/en/datetimezone.listidentifiers.php). I am currently building an application and found that Heard Island and MacDonald Islands (ISO code HM) does not exist in the database. After a quick look at the tz data, I was also not able to find anything about Heard Island and MacDonald Island in the files. I believe that there should be an entry for Heard Island and MacDonald Islands (HM) which uses the timezone Australia/Perth. Is it possible that the entry was intentionally excluded for some reason? Or was it just missing from the database? Cheers, John
On 2012-05-11 10:19, Paw Boel Nielsen wrote:
I had the same issue and I resolved it my using the zone “Etc/GMT-5”.
From http://www.timegenie.com/country.time/hm:
QUOTE
To ensure accuracy of information, timegenie.com contacted the Australian Antarctic Division. On January 3, 2005, a senior official confirmed that Heard Island and McDonald Islands are UTC/GMT +5 hours. Additionally, since the islands are uninhabited, the islands do not observe daylight saving time.
UNQUOTE
Also, the "antarctica" file includes this comment: # Australia - territories # Heard Island, McDonald Islands (uninhabited) # previously sealers and scientific personnel wintered # <a href="http://web.archive.org/web/20021204222245/http://www.dstc.qut.edu.au/DST/marg/daylight.html"> # Margaret Turner reports # </a> (1999-09-30) that they're UTC+5, with no DST; # presumably this is when they have visitors. -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
On Fri, May 11, 2012 at 5:22 PM, Ian Abbott <abbotti@mev.co.uk> wrote:
Also, the "antarctica" file includes this comment:
# Australia - territories # Heard Island, McDonald Islands (uninhabited) # previously sealers and scientific personnel wintered # <a href="http://web.archive.org/web/20021204222245/http://www.dstc.qut.edu.au/DST/marg/daylight.html"> # Margaret Turner reports # </a> (1999-09-30) that they're UTC+5, with no DST; # presumably this is when they have visitors.
Has there been a population > 0 at any point in time after the cutoff point 1970-01-01 00:00:00 UTC ? If so, why is HM not covered? Get zones get deleted if the area they cover become uninhabited? -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
On 2012-05-11 16:38, Tobias Conradi wrote:
Has there been a population> 0 at any point in time after the cutoff point 1970-01-01 00:00:00 UTC ?
A few scientists.
If so, why is HM not covered?
Maybe because Etc/GMT-5 is adequate?
[Do] zones get deleted if the area they cover become uninhabited?
I don't think so. -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
On Fri, May 11, 2012 at 7:21 PM, Ian Abbott <abbotti@mev.co.uk> wrote:
If so, why is HM not covered?
Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
I don't know whether HM observed UTC+5 during all the time since 1970. That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
I agree with Tobias a new zone for Heard Island and MacDonald Islands would be beneficial.
Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
Paw -----Original Message----- From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Tobias Conradi Sent: 11 May 2012 21:44 To: tz@iana.org Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands On Fri, May 11, 2012 at 7:21 PM, Ian Abbott <abbotti@mev.co.uk> wrote:
If so, why is HM not covered?
Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
I don't know whether HM observed UTC+5 during all the time since 1970. That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
I also agree On 2012-05-11 15:56, Paw Boel Nielsen wrote:
I agree with Tobias a new zone for Heard Island and MacDonald Islands would be beneficial.
Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes. Paw
-----Original Message----- From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Tobias Conradi Sent: 11 May 2012 21:44 To: tz@iana.org Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands
On Fri, May 11, 2012 at 7:21 PM, Ian Abbott<abbotti@mev.co.uk> wrote:
If so, why is HM not covered? Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
I don't know whether HM observed UTC+5 during all the time since 1970.
That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so.
-- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany
--
I also agree. ------------------------------ Mark <https://plus.google.com/114199149796022210033> * * *— Il meglio è l’inimico del bene —* ** On Fri, May 11, 2012 at 1:17 PM, David Patte <dpatte@relativedata.com>wrote:
I also agree
On 2012-05-11 15:56, Paw Boel Nielsen wrote:
I agree with Tobias a new zone for Heard Island and MacDonald Islands would be beneficial.
Maybe because Etc/GMT-5 is adequate?
Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
Paw
-----Original Message----- From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Tobias Conradi Sent: 11 May 2012 21:44 To: tz@iana.org Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands
On Fri, May 11, 2012 at 7:21 PM, Ian Abbott<abbotti@mev.co.uk> wrote:
If so, why is HM not covered?
Maybe because Etc/GMT-5 is adequate?
Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
I don't know whether HM observed UTC+5 during all the time since 1970.
That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so.
-- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany
--
Wouldn't we normally _not_ create a new zone until it diverges from its current zone? Which makes the historical "has it always been GMT-5" important. If that answer is yes, then there's no need (yet) for a new zone, but if there is an historical divergence then a new zone is warranted. From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Mark Davis ? Sent: Friday, May 11, 2012 2:54 PM To: David Patte Cc: tz@iana.org Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands I also agree. ________________________________ Mark<https://plus.google.com/114199149796022210033> — Il meglio è l’inimico del bene — On Fri, May 11, 2012 at 1:17 PM, David Patte <dpatte@relativedata.com<mailto:dpatte@relativedata.com>> wrote: I also agree On 2012-05-11 15:56, Paw Boel Nielsen wrote: I agree with Tobias a new zone for Heard Island and MacDonald Islands would be beneficial. Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes. Paw -----Original Message----- From: tz-bounces@iana.org<mailto:tz-bounces@iana.org> [mailto:tz-bounces@iana.org<mailto:tz-bounces@iana.org>] On Behalf Of Tobias Conradi Sent: 11 May 2012 21:44 To: tz@iana.org<mailto:tz@iana.org> Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands On Fri, May 11, 2012 at 7:21 PM, Ian Abbott<abbotti@mev.co.uk<mailto:abbotti@mev.co.uk>> wrote: If so, why is HM not covered? Maybe because Etc/GMT-5 is adequate? Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes. I don't know whether HM observed UTC+5 during all the time since 1970. That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/ --
We do break zones by country code, even if the rules would be identical. ------------------------------ Mark <https://plus.google.com/114199149796022210033> * * *— Il meglio è l’inimico del bene —* ** On Fri, May 11, 2012 at 3:05 PM, Paul Goyette <pgoyette@juniper.net> wrote:
Wouldn't we normally _not_ create a new zone until it diverges from its current zone?****
** **
Which makes the historical "has it always been GMT-5" important. If that answer is yes, then there's no need (yet) for a new zone, but if there is an historical divergence then a new zone is warranted.****
** **
** **
*From:* tz-bounces@iana.org [mailto:tz-bounces@iana.org] *On Behalf Of *Mark Davis ? *Sent:* Friday, May 11, 2012 2:54 PM *To:* David Patte *Cc:* tz@iana.org
*Subject:* Re: [tz] Missing entry for Heard Island and MacDonald Islands** **
** **
I also agree. ****
** ** ------------------------------
Mark <https://plus.google.com/114199149796022210033>****
** **
*— Il meglio è l’inimico del bene —*****
****
On Fri, May 11, 2012 at 1:17 PM, David Patte <dpatte@relativedata.com> wrote:****
I also agree****
On 2012-05-11 15:56, Paw Boel Nielsen wrote:****
I agree with Tobias a new zone for Heard Island and MacDonald Islands would be beneficial.****
Maybe because Etc/GMT-5 is adequate?****
Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.****
Paw
-----Original Message----- From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Tobias Conradi Sent: 11 May 2012 21:44 To: tz@iana.org Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands
On Fri, May 11, 2012 at 7:21 PM, Ian Abbott<abbotti@mev.co.uk> wrote:****
If so, why is HM not covered?****
Maybe because Etc/GMT-5 is adequate?****
Systems that are set to use "Etc/GMT-5" will not observe a change even if HM changes.
I don't know whether HM observed UTC+5 during all the time since 1970.
That is an information the tzdb provides for many other ISO 3166-1 regions, but for HM it fails to do so.
-- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany
****
** **
-- ****
** **
<<On Fri, 11 May 2012 15:05:59 -0700, Paul Goyette <pgoyette@juniper.net> said:
Wouldn't we normally _not_ create a new zone until it diverges from its current zone? Which makes the historical "has it always been GMT-5" important. If that answer is yes, then there's no need (yet) for a new zone, but if there is an historical divergence then a new zone is warranted.
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone. The Antarctic bases are considered to be inhabited, by this definition, even if there is no full-time civilian population, but there does not appear to be any sort of permanent human presence on Heard and the McDonald Islands. The Wikipedia article at least claims that they are "currently uninhabited". heardisland.aq says: Since the first landing on Heard Island in 1855, there have been only approximately 240 shore-based visits to the island, and only two landings on McDonald Island (in 1971 and 1980). That would suggest that they should not be assigned a zone. If the Australian government were to establish a permanent manned station on the islands, then adding a new zone might be justified. -GAWollman
That rule, while understandable, does cause hiccups; it would be easier for implementations if each country code mapped to at least one zone. ------------------------------ Mark <https://plus.google.com/114199149796022210033> * * *— Il meglio è l’inimico del bene —* ** On Fri, May 11, 2012 at 3:36 PM, Garrett Wollman <wollman@csail.mit.edu>wrote:
<<On Fri, 11 May 2012 15:05:59 -0700, Paul Goyette <pgoyette@juniper.net> said:
Wouldn't we normally _not_ create a new zone until it diverges from its current zone? Which makes the historical "has it always been GMT-5" important. If that answer is yes, then there's no need (yet) for a new zone, but if there is an historical divergence then a new zone is warranted.
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone. The Antarctic bases are considered to be inhabited, by this definition, even if there is no full-time civilian population, but there does not appear to be any sort of permanent human presence on Heard and the McDonald Islands. The Wikipedia article at least claims that they are "currently uninhabited".
heardisland.aq says:
Since the first landing on Heard Island in 1855, there have been only approximately 240 shore-based visits to the island, and only two landings on McDonald Island (in 1971 and 1980).
That would suggest that they should not be assigned a zone. If the Australian government were to establish a permanent manned station on the islands, then adding a new zone might be justified.
-GAWollman
That rule, while understandable, Is it?
tzcode2012b\Theory: "However, uninhabited ISO 3166 regions like Bouvet Island do not need locations, since local time is not defined there." 1) there is no definition of "uninhabited" de WP reports a team of people has been there after the 1970-01-01 cutoff point: http://de.wikipedia.org/wiki/Bouvetinsel#cite_note-6 "Vom 24. Dezember 1978 bis zum 8. März 1979 hielt sich ein norwegisches Forschungsteam auf der Insel auf und führte biologische und geologische Forschungsarbeiten durch." There are more sources supporting the claim that it had been populated. 2) a region does not "need" locations? I thought tz editors decide on which location to use, but not on "need" of locations. Wikitravel reports Olav Peak exists on Bouvet Island, without discussing a need for the peak. 3) I doubt, that local time is not defined in a region only because there is no population. It is defined for deserts in North America. If there is no-one in my bathroom still, civil time is defined there. Furthermore the file says "Use UTC (with time zone abbreviation "zzz") for locations while uninhabited." My flat gets UTC if I leave it? http://en.wikipedia.org/wiki/Mount_Chamberlin_(Alaska) on UTC most of the year? What zone to use for Bouvet Island in February 1979 when it was inhabited? Or was is not inhabited despite people living there?
it would be easier for implementations if each country code mapped to at least one zone. These country codes can be deleted, former ISO country codes are tracked in http://en.wikipedia.org/wiki/ISO_3166-3#Current_codes
A zone may get deleted if it had been created only on the basis that each country should get at least one zone. Imagine the Netherlands Antilles revert their split and there have only been differences before 1970. Then the pre-1970 data could become deleted. Making it easier for implementations to map to ISO 3166 is a mapping issue. The other issue is that clock time is defined for a region of the earth (HM = UTC+5 according to timegenie), but the tzdb does not track that, which violates Theory: ----- Scope of the tz database ----- The tz database attempts to record the history and predicted future of all computer-based clocks that track civil time. To represent this data, the world is partitioned into regions whose clocks all agree about time stamps that occur after the somewhat-arbitrary cutoff point of the POSIX Epoch (1970-01-01 00:00:00 UTC). -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
On 05/11/2012 03:36 PM, Garrett Wollman wrote:
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone.
Yes, the idea is that the tz database attempts to record common real-world practice at a location. Local time is undefined if there are no locals. It's like trying to define the temperature of a true vacuum. A goal of the tz database design is to lessen the need for arguments. Omitting uninhabited locations is one small way to further that goal.
On Sat, May 12, 2012 at 2:13 AM, Paul Eggert <eggert@cs.ucla.edu> wrote:
On 05/11/2012 03:36 PM, Garrett Wollman wrote:
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone.
Yes, the idea is that the tz database attempts to record common real-world practice at a location.
Local time is undefined if there are no locals. Any source for the claim? Vast areas of Siberia without local time?
It's like trying to define the temperature of a true vacuum. What level of discussion is this?
http://www.timegenie.com/country.time/hm reports that the Australian Antarctic Division did succeed to define a time.
A goal of the tz database design is to lessen the need for arguments. Omitting uninhabited locations is one small way to further that goal. They are only omitted sometimes. This is inconsistent.
-- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
## What level of discussion is this? Actually, a funny and intelligent answer from Paul. True vacuum has no atoms. As temperature is understood to be the measure of how much atoms move relative to each other (or similar), it makes little sense to talk about temperature where there are no atoms. Similarly, a long discussion about a time zone for a place where there is nobody to look at a clock seems futile. Small groups of temporary visitors do not count, because they will observe whatever time they want to. They may, for example, decide to leave clocks at their home time zone, or set them as dictated by geographical time or whatever. On the other hand, if a governmental organization defines a time zone for an area, like for HM or Siberia, then it makes sense to consider this time zone as applying to the area. The real question to answer is, if we want the tz database to have a time zone for each ISO territory code or not. If not, then UTC+5 is good enough. It is really waste of time to try to define history of observed time for a generally inhabited island. If yes, let's add a time zone and define it as UTC+5 with no history. -- S5sz On Fri, May 11, 2012 at 5:22 PM, Tobias Conradi <tobias.conradi@gmail.com>wrote:
On Sat, May 12, 2012 at 2:13 AM, Paul Eggert <eggert@cs.ucla.edu> wrote:
On 05/11/2012 03:36 PM, Garrett Wollman wrote:
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone.
Yes, the idea is that the tz database attempts to record common real-world practice at a location.
Local time is undefined if there are no locals. Any source for the claim? Vast areas of Siberia without local time?
It's like trying to define the temperature of a true vacuum. What level of discussion is this?
http://www.timegenie.com/country.time/hm reports that the Australian Antarctic Division did succeed to define a time.
A goal of the tz database design is to lessen the need for arguments. Omitting uninhabited locations is one small way to further that goal. They are only omitted sometimes. This is inconsistent.
-- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany
On Sat, May 12, 2012 at 4:31 AM, Sergiusz Wolicki <sergiusz@wolicki.com> wrote:
## What level of discussion is this?
Actually, a funny
depends on the reader
and intelligent answer may depend on the intelligence of the reader
True vacuum has no atoms. As temperature is understood to be the measure of how much atoms move relative to each other (or similar), it makes little sense to talk about temperature where there are no atoms. The one who talks about it is you.
Similarly, a long discussion about a time zone for a place where there is nobody to look at a clock seems futile. Theory does not define that there needs to be someone to look at a clock.
Long discussions get shorter if people read Theory "The tz database attempts to record the history and predicted future of all computer-based clocks that track civil time."
Small groups of temporary visitors do not count, because they will observe whatever time they want to. Theory does not define a threshold for how small or big a group of "visitors" should be to change observed time.
They may, for example, decide to leave clocks at their home time zone, or set them as dictated by geographical time or whatever.
On the other hand, if a governmental organization defines a time zone for an area, like for HM or Siberia, then it makes sense to consider this time zone as applying to the area. The real question to answer is, if we want the tz database to have a time zone for each ISO territory code or not. Who is "we"? Some contributors to the tz mailing list already wrote they would like a zone for HM. Others talk about vacuum. Others try to make sense of the Theory file.
If not, then UTC+5 is good enough. Even if it is not set up for each ISO territory, UTC+5 is insufficient, as it violates tzcode2012b/Theory
"The tz database attempts to record the history and predicted future of all computer-based clocks that track civil time. To represent this data, the world is partitioned into regions whose clocks all agree about time stamps that occur after the somewhat-arbitrary cutoff point of the POSIX Epoch (1970-01-01 00:00:00 UTC). For each such region, the database records all known clock transitions, and labels the region with a notable location." UTC+5 is not a location and can therefor not be a label for a region as defined above.
It is really waste of time to try to define history of observed time for a generally inhabited island. It can be considered waste of time to make the preceding statement.
Some of those that support a zone for HM do not "try to define history of observed time", but have a definition already. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
There are sources that indicate the islands in periods has been inhabited a several times in the past. In addition to this the islands has been assigned an ISO 3166-2 code and even a top-level domain. I see no reason why a zone should not be created. Just my two cents. -----Original Message----- From: tz-bounces@iana.org [mailto:tz-bounces@iana.org] On Behalf Of Paul Eggert Sent: 12 May 2012 02:14 To: Garrett Wollman Cc: Time zone mailing list Subject: Re: [tz] Missing entry for Heard Island and MacDonald Islands On 05/11/2012 03:36 PM, Garrett Wollman wrote:
The historical practice of the maintainers up to this point has been that locations that are uninhabited do not get a zone.
Yes, the idea is that the tz database attempts to record common real-world practice at a location. Local time is undefined if there are no locals. It's like trying to define the temperature of a true vacuum. A goal of the tz database design is to lessen the need for arguments. Omitting uninhabited locations is one small way to further that goal.
On 2012-05-11 09:52, dfg dfg wrote:
Hi everyone,
I am a developer by trade, so I am not sure if I have stumbled onto some missing data in the tz database. I am accessing the database using PHP (www.php.net <http://www.php.net>) which uses the latest version of the tz database (2012.3). I can use one of the built in functions to lookup timezone information for a given country using its ISO 3166-1 two letter country code (http://www.php.net/manual/en/datetimezone.listidentifiers.php).
I am currently building an application and found that Heard Island and MacDonald Islands (ISO code HM) does not exist in the database. After a quick look at the tz data, I was also not able to find anything about Heard Island and MacDonald Island in the files. I believe that there should be an entry for Heard Island and MacDonald Islands (HM) which uses the timezone Australia/Perth.
Is it possible that the entry was intentionally excluded for some reason? Or was it just missing from the database?
The tz database doesn't provide a mapping from country codes to timezones, but it does map each time zone name to a single, representative geographical location (i.e. the city or settlement name used to construct the time zone name). Other projects may provide mappings from any location on Earth (or at least the inhabited regions) to the appropriate entry in the tz database for that location. If Heard Island and MacDonald Island have had wall-clock times different to Australia/Perth in the past (and especially since Jan 1, 1970 onwards), then they should have their own entry in the tz database. -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@mev.co.uk> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
On Fri, May 11, 2012 at 11:34 AM, Ian Abbott <abbotti@mev.co.uk> wrote:
The tz database doesn't provide a mapping from country codes to timezones, zone.tab maps tz zones to countries.
tzcode2012b/Theory says: "Use ISO 3166 (see the file iso3166.tab) to help decide whether something is a country." tzdata2012c\iso3166.tab says HM Heard Island & McDonald Islands tzcode2012b/Theory also says: "However, uninhabited ISO 3166 regions like Bouvet Island do not need locations, since local time is not defined there." http://en.wikipedia.org/wiki/Heard_Island_and_McDonald_Islands says Population 0 (as of 1 January 2011) I don't know whether tzcode2012b/Theory is correct in claiming that local time is not defined in uninhabited "ISO 3166 regions". -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/
participants (10)
-
David Patte -
dfg dfg -
Garrett Wollman -
Ian Abbott -
Mark Davis ☕ -
Paul Eggert -
Paul Goyette -
Paw Boel Nielsen -
Sergiusz Wolicki -
Tobias Conradi