IANA time zone database: Difference between revisions

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{{IANA time zone database}}
== Abbreviations ==
== Abbreviations ==
* proposal to change to [[Internationalized time point unique time zone abbreviations]] at http://mm.icann.org/pipermail/tz/2012-October/018362.html
[[IANA time zone database - time zone acronyms]]


== Bugs ==
[[IANA time zone database - bugs]]


=== Components that specify a location ===
==Zone terminology==
* Sometimes the ISO 3166-1 alpha-2 country code (cc) is used, then the format often is ccT.
----
* Two letters for locality - xxT
Guy Harris 2013-09-18 23:37:48 http://mm.icann.org/pipermail/tz/2013-September/020284.html
** Brazil - Fernando Noronha: FNT
* Two letter for locality - xxST
** Lord Howe : LHST
* Two letters for locality - xx%sT
** Several zone in Brazil that use Brasilia BRT (BR is also the country code)
 
Other:
Kampala:
3:00 - EAT 1930
2:30 - BEAT 1948
2:45 - BEAUT 1957
Aruba (in ISO 3166-1 AW)
-4:00 - AST
GBGT 1966 May 26 # Br Guiana Time
NEGT 1975 Nov 20 # Dutch Guiana Time
 
=== Components that do not specify a location ===
{| class="wikitable"
! position from right
! Letter
! Meaning
! Save
! Occurrence
|-
| 1
| T
| Time
| N/A
| always
|-
| 2
| D
| Daylight (Saving)
| 1:00
| several
|-
| 2
| S
| Standard
| N/A
| several
|-
| 2
| S
| Summer
| 1:00
| europe file: e.g. BST British Summer Time, CEST Central European Summer Time
|-
| 2
| W
| War
| 1:00
| northamerica file: US and Mexico
|-
| 2
| P
| Peace
| 1:00
| northamerica file: US
|-
| 2
| M
| Mean
| N/A
|
* africa file: LMT # Lisbon Mean Time, FMT # Freetown Mean Time, PMT # Paris Mean Time
* europe file: MMT # Moscow Mean Time
* southamerica file: CMT # Cordoba Mean Time, CMT # Calamarca MT(!), QMT # Quito Mean Time, BMT # Bogota Mean Time, SMT # Stanley Mean Time, SMT # Santiago Mean Time, MMT # Montevideo MT(!), PMT # Paramaribo Mean Time, CMT # Caracas Mean Time
|-
| 2
| M
| Midsummer
| 2:00
| europe file: Moscow - M # Midsummer, also for Spain, France, Germany/SovietZone
|-
| 32
| LM
| Local Mean
| N/A
| several
|-
| 32
| DS
| Double Summer
| 2:00
| europe file: MDST # Moscow Double Summer Time, BDST - British Double Summer Time
|-
| 32
| DD
| Double Daylight (Saving)
| 2:00
| northamerica file: StJohns 1988)
|-
| 32
| HS
| Half Summer
| 0:30
|
* australasia file: Pacific/Rarotonga CK%sT and "HS"
* southamerica file: Uruguay
|-
| 32
| HS
| Half Summer
| 0:20
|
* africa file: Rule Ghana 1936-1942
|-
| 32
| HD
| Half Daylight (Saving)
| 0:30
|
* northamerica file: Rule Belize 1918-1942
* northamerica file: Rule DR 1969-1973
|}


== Bugs ==
So I prefer terms such as "tzdb zone" to refer to those things that have tzids. I'm not wedded to *that* term, but there should be *some* term other than "time zone" for that.
Some fixes can be found at [[ANNA time zone database]].
{| class="wikitable sortable"
! Country
! Description
! width=64 | Open since at least
! Why not fixed?
|-
| [[Australia]]
| EST and CST are used as acronyms for AEST/AEDT and CEST/CEDT, i.e. during DST one cannot tell from the acronym what zone is meant.
| 2006-06-02 04:08:36 [http://article.gmane.org/gmane.comp.time.tz/1042/match=est]
| under consideration
|-
| [[Indonesia]]
| WIT means Western Indonesian Time, but in local Indonesian language, WIT stands for Waktu Indonesia Timur (Eastern Indonesian Time), change requests - without mentioning the ambiguity - go back to 2003 [http://article.gmane.org/gmane.linux.debian.devel.glibc/12741/match=wita+wib+wit]
| 2013-02-13 14:17:58 [http://article.gmane.org/gmane.comp.time.tz/5839]
|
|-
| [[Norway]]
| No IANA zone defined for Bouvet Island while Norwegian law sets a standard time http://article.gmane.org/gmane.comp.time.tz/5218/
| 2012-05-29 18:32:23 [http://article.gmane.org/gmane.comp.time.tz/5218/]
| TZ coordinator (Paul Eggert) does not want to fix
|-
| [[Russia]]
|
*Zones in Siberia are wrong
* patch provided 2012-05-02 22:18:43 by Arthur David Olson [http://article.gmane.org/gmane.comp.time.tz/4905/match=barnaul+tomsk]
| 2011-09-17 16:12:16 [http://article.gmane.org/gmane.comp.time.tz/4872/match=siberia]
| 2013-04-18 under consideration
|-
| Australia
| tzid Antarctica/Macquarie is listed for Antarctica, but it is not near the landmass, and not even in the oceanic region included in the Antarctic Treaty. Suggested fix: Pacific/Macquarie. Bug introduced ca 2010 [https://github.com/eggert/tz/commit/13f3a82a08f860d9beac390426e582e5f89c6f6c#zone.tab]
| 2013-04
|
|-
| French Southern and Antarctic Land
| Zone missing:
*http://mm.icann.org/pipermail/tz/2012-May/017804.html
| 2012-05-12 [http://mm.icann.org/pipermail/tz/2012-May/017804.html]
|
|}


==Zone renaming==
The tzdb currently does not have a concept of "time zone" in the sense of a region with a specified base time offset; are you suggesting that it add one?
* Alma-Ata->Almaty https://github.com/eggert/tz/commit/ef92aeaad41598210a2d973fd653bed48166f913#zone.tab
----
* Ulan_Bator->Ulaanbaatar https://github.com/eggert/tz/commit/377789bf6b7491c661f2abd274ead292e20aa2d5#zone.tab
* Thimbu->Thimphu, Ashkhabad->Ashgabat https://github.com/eggert/tz/commit/5fc6f6d97aba126b82e203373037ff0ddb77291e#zone.tab
* Dacca->Dhaka https://github.com/eggert/tz/commit/d2a2377eb277c4185255248d7436363ce662e046#zone.tab
* Porto Acre->Rio Branco https://github.com/eggert/tz/commit/b4823fa8d676cc4b72ca89a085358e17d18106a6#zone.tab
* Macao->Macau https://github.com/eggert/tz/commit/0594b59cdab15ff1dcccdb64bcb6b32bc096fb5d#zone.tab
* Ujung_Pandang->Makassar https://github.com/eggert/tz/commit/59b22c72fd2ffe9245b269cb9634a9ccb6f89c18#zone.tab
* /Argentina/ https://github.com/eggert/tz/commit/86ca028348fee535690202b5cbb73f93673cf2e2#zone.tab
* Coral Harbour -> Atikokan https://github.com/eggert/tz/commit/2436b01841ed68e63d5f72a2c1cacbce116a73d0#zone.tab
* Asmera->Asmara https://github.com/eggert/tz/commit/f7e6fba9999a45a8baf73b5b1aac139df99bf956#zone.tab
* Faeroe->Faroe https://github.com/eggert/tz/commit/e35b3358118ab6b2529a55e6d162a602f9dcf6d8#zone.tab
* Saigon->Ho_Chi_Minh https://github.com/eggert/tz/commit/6dfed6b7a0b4fc3ec96d36aba9cd6fc0153b362a#zone.tab
* Calcutta->Kolkata https://github.com/eggert/tz/commit/6ce4c9420f6746d9e06269a80381af29c555c558#zone.tab
* Kathmandu->Katmandu https://github.com/eggert/tz/commit/27bdceb8d4a40bf01ad30592e5c0b9060720c319#zone.tab
* Truk->Chuuk, Ponape->Pohnpei https://github.com/eggert/tz/commit/67b1c5f6929c1562ea68a5716ca136c0ee42b252#zone.tab
 
Removal
* Ensenada
** https://github.com/eggert/tz/commit/3d8ce2fa1dcdd23a753ffc6dd5a7ebcefbfff92d#zone.tab
** https://github.com/eggert/tz/commit/62250927e3cace5efd873f7817b363cb9d1588be#zone.tab
* ComodRivadavia https://github.com/eggert/tz/commit/63136721d64f6b5af8328f567c53308fa7e7f7c4#zone.tab
* Jan Mayen https://github.com/eggert/tz/commit/98c2234160bcc8d0045c67c3567ed2e916a0b356#zone.tab
* Geneva https://github.com/eggert/tz/commit/1d07c84f7a09468e16dc45df6cb0cf2bb8c59f2a#zone.tab
* Kashi, Wulumuqui https://github.com/eggert/tz/commit/b5a5341f46c01bd35cd9ba110b959c14d174de0a#zone.tab
* Tiraspol https://github.com/eggert/tz/commit/d7cc3a8a401b67dcb563f2bcf0c034f84b22e277#zone.tab


==Localization==
==Localization==
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* territory 001 - might refer to the UN M.49 code for "World".
* territory 001 - might refer to the UN M.49 code for "World".
==Zone changes==
2013-08-11
-AQ    -7750+16636    Antarctica/McMurdo      McMurdo Station, Ross Island
-AQ    -9000+00000    Antarctica/South_Pole  Amundsen-Scott Station, South Pole
+AQ    -7750+16636    Pacific/Auckland        McMurdo, South Pole, Scott (New Zealand time)
So Pacific/Auckland now has two pairs of coordinates, the new AQ-one and the old NZ-one.
NZ -3652+17446 Pacific/Auckland most locations
*Connecting Vaduz to Bern Mean Time
**http://mm.icann.org/pipermail/tz/2013-September/020085.html

Latest revision as of 2014-07-20T03:04:38

Abbreviations

IANA time zone database - time zone acronyms

Bugs

IANA time zone database - bugs

Zone terminology

Guy Harris 2013-09-18 23:37:48 http://mm.icann.org/pipermail/tz/2013-September/020284.html

So I prefer terms such as "tzdb zone" to refer to those things that have tzids. I'm not wedded to *that* term, but there should be *some* term other than "time zone" for that.

The tzdb currently does not have a concept of "time zone" in the sense of a region with a specified base time offset; are you suggesting that it add one?

Localization

CLDR

http://unicode.org/repos/cldr/trunk/common/supplemental/metaZones.xml

  • territory 001 - might refer to the UN M.49 code for "World".

Zone changes

2013-08-11 

-AQ     -7750+16636     Antarctica/McMurdo      McMurdo Station, Ross Island
-AQ     -9000+00000     Antarctica/South_Pole   Amundsen-Scott Station, South Pole
+AQ     -7750+16636     Pacific/Auckland        McMurdo, South Pole, Scott (New Zealand time)

So Pacific/Auckland now has two pairs of coordinates, the new AQ-one and the old NZ-one. 

NZ	-3652+17446	Pacific/Auckland	most locations
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