Le 4 déc. 2017 à 18:18, Michael Douglass <mikeadouglass@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