[tz] Reason for removal of several TZ abbreviations

Michael Douglass mikeadouglass at gmail.com
Tue Dec 5 02:26:42 UTC 2017



On 12/4/17 19:38, David Patte ₯ wrote:
> 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?
I think under such as scheme the differentiation between names and 
aliases disappears. They are all names mapped onto a unique tzid, so 
America/NewYork and US/Eastern would refer to the same tzid.
>
>
> 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
>>
>>
>



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