IANA time zone database

Abbreviations

proposal to change to Internationalized time point unique time zone abbreviations at http://mm.icann.org/pipermail/tz/2012-October/018362.html

Components that specify a location

Sometimes the ISO 3166-1 alpha-2 country code (cc) is used, then the format often is ccT.
Two letters for locality - xxT
- 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

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

IANA time zone database - bugs

Zone renaming

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

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

Connecting Vaduz to Bern Mean Time
- http://mm.icann.org/pipermail/tz/2013-September/020085.html