[tz] Reason for removal of several TZ abbreviations

David Patte ₯ dpatte at relativedata.com
Tue Dec 5 00:38:41 UTC 2017


Using such a scheme, a database such as geonames would then map a 
location to the tz id (as it does now), defering political arguments to 
geonames, and removing them from this list. It seems appropriate.

But what about the tz designations (such as EDT), do we have a solution 
to that conundrum?


On 2017-12-04 19:21, Michael Douglass wrote:
> With a mapping table it doesn't matter what the id is. In fact any 
> scheme for producing an id that is reversible or ordered in any way 
> will lead to people using that then complaining down the road if you 
> do something that "breaks" their code.
>
> I'd suggest writing a small routine to create an 8 character random 
> base64 id and get a new random id for each new zone. (I'd suggest a 
> uuid but they're bulky).
>
> Then create a legacy-mappings.txt file to map all the current names 
> and aliases on to the new id - then we're sort of done.
>
> I'd suggest a simple increasing sequence but you can guarantee that 
> somebody would use it as an index even if told not to.
>
> Then we can stop having these long arguments about why one name or 
> another isn't in the tz data. Everybody is free to generate their own 
> list if they so wish.
>
>
> On 12/4/17 19:05, J Andrew Lipscomb wrote:
>>> Le 4 déc. 2017 à 18:18, Michael Douglass <mikeadouglass at gmail.com> a 
>>> écrit :
>>> Exactly - that's why I said opaque
>> I just came up with a system I think is opaque enough while still 
>> maintaining a bit of useful information in the id:
>> First up, it goes with the letter-digit-letter format.
>>
>> The first letter represents the (lower) GMT offset of the zone in 
>> military format.
>> (This represents the one real flaw I see: a zone’s proper letter can 
>> change if it adopts something on the order of year-round daylight 
>> savings time.)
>>
>> The digit is usually 0. It changes in the following cases:
>> 3 would indicate a +:15 zone if there were any, 5 is a +:30 zone, and 
>> 8 is a +:45 zone.
>> 1 is used with M (normally +12) to indicate +13, and M2 similarly 
>> indicates +14.
>> 1 is also used with other letters when the 0 range overflows.
>>
>> The second letter is meaningless UNLESS it is Z. Z indicates a 
>> non-geographic time zone (the Etc/ series of indicators).
>>
>> The list I just randomized, presented in order of newID:
>>
>> Africa/Ndjamena    a0a
>> Africa/Tunis    a0b
>> Europe/Gibraltar    a0c
>> Europe/Monaco    a0d
>> Europe/Oslo    a0e
>> Europe/Warsaw    a0f
>> Europe/Zurich    a0g
>> Europe/Madrid    a0h
>> Europe/Copenhagen    a0i
>> Europe/Brussels    a0j
>> Europe/Malta    a0k
>> Europe/Andorra    a0l
>> Africa/Algiers    a0m
>> Europe/Paris    a0n
>> Europe/Amsterdam    a0o
>> Europe/Luxembourg    a0p
>> Africa/Ceuta    a0q
>> Europe/Tirane    a0r
>> Europe/Vienna    a0s
>> Europe/Belgrade    a0t
>> Europe/Budapest    a0u
>> Europe/Prague    a0v
>> Europe/Rome    a0w
>> Africa/Lagos    a0x
>> Europe/Stockholm    a0y
>> Etc/GMT-1    a0z
>> Asia/Beirut    b0a
>> Europe/Bucharest    b0b
>> Europe/Riga    b0c
>> Africa/Khartoum    b0d
>> Asia/Damascus    b0e
>> Africa/Windhoek    b0f
>> Europe/Tallinn    b0g
>> Asia/Hebron    b0h
>> Africa/Maputo    b0i
>> Europe/Athens    b0j
>> Europe/Kiev    b0k
>> Europe/Sofia    b0l
>> Africa/Johannesburg    b0m
>> Europe/Chisinau    b0n
>> Europe/Zaporozhye    b0o
>> Asia/Famagusta    b0p
>> Asia/Nicosia    b0q
>> Africa/Tripoli    b0r
>> Europe/Uzhgorod    b0s
>> Asia/Jerusalem    b0t
>> Africa/Cairo    b0u
>> Asia/Amman    b0v
>> Asia/Gaza    b0w
>> Europe/Helsinki    b0x
>> Europe/Kaliningrad    b0y
>> Etc/GMT-2    b0z
>> Europe/Vilnius    b1a
>> Europe/Minsk    c0a
>> Europe/Kirov    c0b
>> Africa/Nairobi    c0c
>> Antarctica/Syowa    c0d
>> Asia/Baghdad    c0e
>> Asia/Riyadh    c0f
>> Asia/Qatar    c0g
>> Europe/Istanbul    c0h
>> Africa/Juba    c0i
>> Europe/Moscow    c0j
>> Europe/Volgograd    c0k
>> Etc/GMT-3    c0z
>> Asia/Tehran    c5a
>> Asia/Tbilisi    d0a
>> Europe/Saratov    d0b
>> Asia/Dubai    d0c
>> Europe/Samara    d0d
>> Indian/Reunion    d0e
>> Europe/Astrakhan    d0f
>> Indian/Mahe    d0g
>> Asia/Baku    d0h
>> Europe/Ulyanovsk    d0i
>> Asia/Yerevan    d0j
>> Indian/Mauritius    d0k
>> Etc/GMT-4    d0z
>> Asia/Kabul    d5a
>> Asia/Samarkand    e0a
>> Asia/Aqtobe    e0b
>> Asia/Oral    e0c
>> Asia/Dushanbe    e0d
>> Asia/Karachi    e0e
>> Asia/Aqtau    e0f
>> Indian/Kerguelen    e0g
>> Asia/Yekaterinburg    e0h
>> Asia/Ashgabat    e0i
>> Asia/Tashkent    e0j
>> Antarctica/Mawson    e0k
>> Asia/Atyrau    e0l
>> Indian/Maldives    e0m
>> Etc/GMT-5    e0z
>> Asia/Colombo    e5a
>> Asia/Kathmandu    e8a
>> Asia/Omsk    f0a
>> Asia/Dhaka    f0b
>> Antarctica/Vostok    f0c
>> Asia/Bishkek    f0d
>> Asia/Almaty    f0e
>> Asia/Thimphu    f0f
>> Asia/Urumqi    f0g
>> Asia/Qyzylorda    f0h
>> Indian/Chagos    f0i
>> Etc/GMT-6    f0z
>> Asia/Yangon    f5a
>> Indian/Cocos    f5b
>> Asia/Pontianak    g0a
>> Asia/Tomsk    g0b
>> Asia/Bangkok    g0c
>> Asia/Hovd    g0d
>> Asia/Novokuznetsk    g0e
>> Asia/Jakarta    g0f
>> Asia/Krasnoyarsk    g0g
>> Antarctica/Davis    g0h
>> Asia/Barnaul    g0i
>> Asia/Novosibirsk    g0j
>> Indian/Christmas    g0k
>> Asia/Ho_Chi_Minh    g0l
>> Etc/GMT-7    g0z
>> Asia/Singapore    h0a
>> Asia/Taipei    h0b
>> Asia/Makassar    h0c
>> Asia/Brunei    h0d
>> Asia/Kuching    h0e
>> Asia/Ulaanbaatar    h0f
>> Asia/Kuala_Lumpur    h0g
>> Asia/Choibalsan    h0h
>> Asia/Shanghai    h0i
>> Asia/Macau    h0j
>> Asia/Irkutsk    h0k
>> Asia/Hong_Kong    h0l
>> Asia/Manila    h0m
>> Australia/Perth    h0n
>> Etc/GMT-8    h0z
>> Asia/Pyongyang    h5a
>> Australia/Eucla    h8a
>> Pacific/Palau    i0a
>> Asia/Khandyga    i0b
>> Asia/Seoul    i0c
>> Asia/Yakutsk    i0d
>> Asia/Dili    i0e
>> Asia/Chita    i0f
>> Asia/Jayapura    i0g
>> Asia/Tokyo    i0h
>> Etc/GMT-9    i0z
>> Australia/Adelaide    i5a
>> Australia/Darwin    i5b
>> Australia/Broken_Hill    i5c
>> Australia/Brisbane    k0a
>> Pacific/Port_Moresby    k0b
>> Australia/Hobart    k0c
>> Australia/Sydney    k0d
>> Australia/Currie    k0e
>> Asia/Vladivostok    k0f
>> Australia/Lindeman    k0g
>> Australia/Melbourne    k0h
>> Asia/Ust-Nera    k0i
>> Antarctica/DumontDUrville    k0j
>> Pacific/Guam    k0k
>> Pacific/Chuuk    k0l
>> Etc/GMT-10    k0z
>> Australia/Lord_Howe    k5a
>> Pacific/Bougainville    l0a
>> Pacific/Norfolk    l0b
>> Antarctica/Macquarie    l0c
>> Pacific/Kosrae    l0d
>> Asia/Sakhalin    l0e
>> Pacific/Noumea    l0f
>> Pacific/Guadalcanal    l0g
>> Asia/Magadan    l0h
>> Pacific/Efate    l0i
>> Asia/Srednekolymsk    l0j
>> Antarctica/Casey    l0k
>> Pacific/Pohnpei    l0l
>> Etc/GMT-11    l0z
>> Pacific/Tarawa    m0a
>> Pacific/Nauru    m0b
>> Pacific/Majuro    m0c
>> Pacific/Fiji    m0d
>> Pacific/Kwajalein    m0e
>> Pacific/Wallis    m0f
>> Asia/Anadyr    m0g
>> Pacific/Wake    m0h
>> Pacific/Funafuti    m0i
>> Asia/Kamchatka    m0j
>> Pacific/Auckland    m0k
>> Etc/GMT-12    m0z
>> Pacific/Tongatapu    m1a
>> Pacific/Fakaofo    m1b
>> Pacific/Enderbury    m1c
>> Pacific/Apia    m1d
>> Etc/GMT-13    m1z
>> Pacific/Kiritimati    m2a
>> Etc/GMT-14    m2z
>> Pacific/Chatham    m8a
>> Atlantic/Cape_Verde    n0a
>> Atlantic/Azores    n0b
>> America/Scoresbysund    n0c
>> Etc/GMT+1    n0z
>> America/Noronha    o0a
>> Atlantic/South_Georgia    o0b
>> Etc/GMT+2    o0z
>> America/Argentina/La_Rioja    p0a
>> America/Argentina/Catamarca    p0b
>> America/Montevideo    p0c
>> America/Argentina/Buenos_Aires    p0d
>> Antarctica/Rothera    p0e
>> America/Argentina/San_Juan    p0f
>> America/Sao_Paulo    p0g
>> America/Godthab    p0h
>> America/Araguaina    p0i
>> America/Argentina/Salta    p0j
>> America/Argentina/Mendoza    p0k
>> America/Santarem    p0l
>> America/Cayenne    p0m
>> America/Argentina/Tucuman    p0n
>> America/Argentina/Jujuy    p0o
>> Atlantic/Stanley    p0p
>> America/Argentina/Cordoba    p0q
>> America/Miquelon    p0r
>> America/Argentina/San_Luis    p0s
>> America/Belem    p0t
>> America/Maceio    p0u
>> America/Argentina/Ushuaia    p0v
>> America/Recife    p0w
>> America/Paramaribo    p0x
>> America/Bahia    p0y
>> Etc/GMT+3    p0z
>> America/Fortaleza    p1a
>> America/Argentina/Rio_Gallegos    p1b
>> America/St_Johns    p5a
>> America/Blanc-Sablon    q0a
>> America/Grand_Turk    q0b
>> America/Goose_Bay    q0c
>> America/Glace_Bay    q0d
>> America/Guyana    q0e
>> America/Porto_Velho    q0f
>> America/Boa_Vista    q0g
>> America/Thule    q0h
>> America/Caracas    q0i
>> Atlantic/Bermuda    q0j
>> America/Martinique    q0k
>> America/Port_of_Spain    q0l
>> America/Campo_Grande    q0m
>> America/Halifax    q0n
>> America/Barbados    q0o
>> America/Moncton    q0p
>> America/Manaus    q0q
>> America/Santiago    q0r
>> America/La_Paz    q0s
>> America/Curacao    q0t
>> America/Santo_Domingo    q0u
>> America/Puerto_Rico    q0v
>> America/Asuncion    q0w
>> America/Cuiaba    q0x
>> Etc/GMT+4    q0z
>> America/Cancun    r0a
>> America/Jamaica    r0b
>> America/Kentucky/Louisville    r0c
>> America/Rio_Branco    r0d
>> America/Indiana/Marengo    r0e
>> America/Kentucky/Monticello    r0f
>> America/Lima    r0g
>> America/Indiana/Winamac    r0h
>> America/Indiana/Indianapolis    r0i
>> America/New_York    r0j
>> America/Indiana/Vevay    r0k
>> America/Nipigon    r0l
>> America/Detroit    r0m
>> America/Guayaquil    r0n
>> America/Thunder_Bay    r0o
>> America/Panama    r0p
>> America/Iqaluit    r0q
>> America/Indiana/Vincennes    r0r
>> America/Bogota    r0s
>> America/Eirunepe    r0t
>> America/Atikokan    r0u
>> America/Indiana/Petersburg    r0v
>> America/Port-au-Prince    r0w
>> America/Nassau    r0x
>> America/Toronto    r0y
>> Etc/GMT+5    r0z
>> America/Havana    r1a
>> America/Pangnirtung    r1b
>> America/Chicago    s0a
>> America/Resolute    s0b
>> America/Bahia_Banderas    s0c
>> America/North_Dakota/Beulah    s0d
>> America/Swift_Current    s0e
>> America/North_Dakota/Center    s0f
>> America/Winnipeg    s0g
>> America/El_Salvador    s0h
>> America/Indiana/Tell_City    s0i
>> America/Mexico_City    s0j
>> America/Costa_Rica    s0k
>> America/Monterrey    s0l
>> America/Tegucigalpa    s0m
>> America/Managua    s0n
>> America/Merida    s0o
>> America/Menominee    s0p
>> America/Rankin_Inlet    s0q
>> America/Belize    s0r
>> Pacific/Galapagos    s0s
>> America/Regina    s0t
>> America/Indiana/Knox    s0u
>> America/North_Dakota/New_Salem    s0v
>> Pacific/Easter    s0w
>> America/Rainy_River    s0x
>> America/Guatemala    s0y
>> Etc/GMT+6    s0z
>> America/Matamoros    s1a
>> America/Edmonton    t0a
>> America/Chihuahua    t0b
>> America/Inuvik    t0c
>> America/Cambridge_Bay    t0d
>> America/Mazatlan    t0e
>> America/Hermosillo    t0f
>> America/Fort_Nelson    t0g
>> America/Boise    t0h
>> America/Yellowknife    t0i
>> America/Creston    t0j
>> America/Denver    t0k
>> America/Dawson_Creek    t0l
>> America/Phoenix    t0m
>> America/Ojinaga    t0n
>> Etc/GMT+7    t0z
>> America/Tijuana    u0a
>> America/Los_Angeles    u0b
>> Pacific/Pitcairn    u0c
>> America/Vancouver    u0d
>> America/Whitehorse    u0e
>> America/Dawson    u0f
>> Etc/GMT+8    u0z
>> America/Metlakatla    v0a
>> America/Anchorage    v0b
>> America/Juneau    v0c
>> America/Sitka    v0d
>> Pacific/Gambier    v0e
>> America/Yakutat    v0f
>> America/Nome    v0g
>> Etc/GMT+9    v0z
>> Pacific/Marquesas    v5a
>> Pacific/Rarotonga    w0a
>> Pacific/Tahiti    w0b
>> Pacific/Honolulu    w0c
>> America/Adak    w0d
>> Etc/GMT+10    w0z
>> Pacific/Pago_Pago    x0a
>> Pacific/Niue    x0b
>> Etc/GMT+11    x0z
>> Etc/GMT+12    y0z
>> Europe/Dublin    z0a
>> Africa/Abidjan    z0b
>> Atlantic/Faroe    z0c
>> Africa/Bissau    z0d
>> Atlantic/Madeira    z0e
>> Africa/Accra    z0f
>> Africa/Casablanca    z0g
>> Atlantic/Reykjavik    z0h
>> America/Danmarkshavn    z0i
>> Atlantic/Canary    z0j
>> Europe/Lisbon    z0k
>> Africa/Monrovia    z0l
>> Africa/El_Aaiun    z0m
>> Europe/London    z0n
>> Etc/UTC    z0z
>> Etc/GMT    z0z
>
>

-- 
  




More information about the tz mailing list