J'ai fait un script un peu plus simple en utilisant quelques idées du détecteur impressionnant de Jon Nylander (qui est basé sur le script par Josh Fraser, http://www.onlineaspect.com). Le script de Nylander (ainsi que son homologue jQuery dans https://github.com/scottwater/jquery.detect_timezone) utilise la liste des ambicités et les heures de début de l'heure d'été sont des heures locales. Mon script n'a qu'une seule liste et toutes les dates sont en UTC pour faciliter l'ajout ou la modification de fuseaux horaires, si nécessaire.
Utilisation:
- Enregistrer sous .js et inclure dans la section d'en-tête html
- Appel get_timezone_id() et le fuseau horaire de l'utilisateur est renvoyé par exemple. "Europe/Helsinki"
Ce script peut détecter 90 fuseaux horaires, mais si vous avez besoin de plus, vous devez utiliser l'API GeoLocation ou une bibliothèque côté serveur (geoIP). En fonction de l'objectif, envisagez également d'ajouter une liste de fuseaux horaires sélectionnable par l'utilisateur. Notez également que parce que nous ne savons pas comment les futurs navigateurs et systèmes préserveront les données de transition de l'année 2011, il faudra peut-être faire quelques ajustements un jour dans le futur. (J'ai testé les dates en 1970-80 et les résultats variaient grandement selon les navigateurs du même système (!)) Heureusement, l'année 2011 a disparu et presque tous les systèmes dans le monde ont, espérons-le, mis à jour leurs bases de données tz. plutôt bien maintenant.
/*
This script (Javascript Timezone Detection) detects Olson timezone
ID of user's system's timezone using getTimezoneOffset(). Detection
is tested and passed 100% in the following conditions:
* Windows 7,Opera 11.00
* Windows 7,Firefox 3.6.13
* Windows 7,Safari 5.0.3
* Windows 7,Google Chrome 8.0.552.237
* Windows 7,Internet Explorer 8.0.7600.16385
* Mac OS X,Google Chrome 8.0.552.237
* Mac OS X,Firefox 3.6.13
* Mac OS X,Opera 11.01
* Mac OS X,Safari Version 5.0.3
* Centos 5,Firefox 3.6.13
* Centos 5,Safari
* Centos 5,Opera 11.00
The script has ability to detect 90 timezones.
Every row in zones-array consist of
0: Olson timezone ID,
1-6: Transition start time in UTC (usually summer time start and sometimes winter time start)
7: Utc offset in minutes
8: 1 = has transition,0 = has not transition
Timezones are listed in zones-array this way:
- first comes section of timezones, that have transitions and then section of timezones that have no transitions
- Both sections are then ordered by offset
- Finally the has transitions section is ordered by the transition start time.
If you add more timezones or replaces some, please be sure to maintain this order, otherwise the detection fails in some cases.
Minified size: about 4.46KB
*/
var zones = new Array(
// FIRST DST TIMEZONES
[ 'Pacific/Apia', 2011,3,3,11,0,0, -660, 1 ]/* For Opera Linux. Unexpectedly winter-offset. */,
[ 'Pacific/Apia', 2010,8,26,11,0,0, -600, 1 ]/* STD: -660 */,
[ 'America/Adak', 2011,2,13,12,0,0, -540, 1 ]/* STD: -600 */,
[ 'America/Anchorage', 2011,2,13,11,0,0, -480, 1 ]/* STD: -540 */,
[ 'America/Los_Angeles', 2011,2,13,10,0,0, -420, 1 ]/* STD: -480 */,
[ 'America/Santa_Isabel', 2011,3,3,10,0,0, -420, 1 ]/* STD: -480 */,
[ 'America/Denver', 2011,2,13,9,0,0, -360, 1 ]/* STD: -420 */,
[ 'America/Mazatlan', 2011,3,3,9,0,0, -360, 1 ]/* STD: -420 */,
[ 'America/Chicago', 2011,2,13,8,0,0, -300, 1 ]/* STD: -360 */,
[ 'America/Mexico_City', 2011,3,3,8,0,0, -300, 1 ]/* STD: -360 */,
[ 'Pacific/Easter', 2011,9,9,4,0,0, -300, 1 ]/* STD: -360 */,
[ 'America/Havana', 2011,2,13,5,0,0, -240, 1 ]/* STD: -300 */,
[ 'America/New_York', 2011,2,13,7,0,0, -240, 1 ]/* STD: -300 */,
[ 'America/Goose_Bay', 2011,2,13,4,1,0, -180, 1 ]/* STD: -240 */,
[ 'America/Halifax', 2011,2,13,6,0,0, -180, 1 ]/* STD: -240 */,
[ 'Atlantic/Stanley', 2011,8,4,6,0,0, -180, 1 ]/* STD: -240 */,
[ 'America/Asuncion', 2011,9,2,4,0,0, -180, 1 ]/* STD: -240 */,
[ 'America/Santiago', 2011,9,9,4,0,0, -180, 1 ]/* STD: -240 */,
[ 'America/Campo_Grande', 2011,9,16,4,0,0, -180, 1 ]/* STD: -240 */,
[ 'America/St_Johns', 2011,2,13,3,31,0, -150, 1 ]/* STD: -210 */,
[ 'America/Miquelon', 2011,2,13,5,0,0, -120, 1 ]/* STD: -180 */,
[ 'America/Godthab', 2011,2,27,1,0,0, -120, 1 ]/* STD: -180 */,
[ 'America/Montevideo', 2011,9,2,5,0,0, -120, 1 ]/* STD: -180 */,
[ 'America/Sao_Paulo', 2011,9,16,3,0,0, -120, 1 ]/* STD: -180 */,
[ 'Atlantic/Azores', 2011,2,27,1,0,0, 0, 1 ]/* STD: -60 */,
[ 'Atlantic/Azores', 2010,2,28,3,0,0, 0, 1 ], /* Windows fix */
[ 'Europe/London', 2011,2,27,1,0,0, 60, 1 ]/* STD: 0 */,
[ 'Europe/Berlin', 2011,2,27,1,0,0, 120, 1 ]/* STD: 60 */,
[ 'Africa/Windhoek', 2011,8,4,1,0,0, 120, 1 ]/* STD: 60 */,
[ 'Asia/Gaza', 2011,2,25,22,1,0, 180, 1 ]/* STD: 120 */,
[ 'Asia/Beirut', 2011,2,26,22,0,0, 180, 1 ]/* STD: 120 */,
[ 'Europe/Minsk', 2011,2,27,0,0,0, 180, 1 ]/* STD: 120 */,
// Istanbul and Helsinki are the same, please select which one to use
// [ 'Europe/Istanbul', 2011,2,27,1,0,0, 180, 1 ]/* STD: 120 */,
[ 'Europe/Helsinki', 2011,2,27,1,0,0, 180, 1 ]/* STD: 120 */,
[ 'Asia/Jerusalem', 2011,3,1,0,0,0, 180, 1 ]/* STD: 120 */,
[ 'Africa/Cairo', 2011,3,28,22,0,0, 180, 1 ]/* STD: 120 */,
[ 'Asia/Damascus', 2011,9,27,21,0,0, 120, 1 ]/* Unexpectedly here winter-offset */,
[ 'Asia/Amman', 2011,9,27,22,0,0, 120, 1 ]/* Unexpectedly here winter-offset */,
[ 'Europe/Moscow', 2011,2,26,23,0,0, 240, 1 ]/* STD: 180 */,
[ 'Asia/Tehran', 2009,2,21,20,30,0, 270, 1 ]/* STD: 210 */,
[ 'Asia/Yerevan', 2011,2,26,22,0,0, 300, 1 ]/* STD: 240 */,
[ 'Asia/Baku', 2011,2,27,0,0,0, 300, 1 ]/* STD: 240 */,
[ 'Asia/Yekaterinburg', 2011,2,26,21,0,0, 360, 1 ]/* STD: 300 */,
[ 'Asia/Omsk', 2011,2,26,20,0,0, 420, 1 ]/* STD: 360 */,
[ 'Asia/Krasnoyarsk', 2011,2,26,19,0,0, 480, 1 ]/* STD: 420 */,
[ 'Asia/Irkutsk', 2011,2,26,18,0,0, 540, 1 ]/* STD: 480 */,
[ 'Asia/Yakutsk', 2011,2,26,17,0,0, 600, 1 ]/* STD: 540 */,
[ 'Australia/Adelaide', 2011,9,1,16,30,0, 630, 1 ]/* STD: 570 */,
[ 'Asia/Vladivostok', 2011,2,26,16,0,0, 660, 1 ]/* STD: 600 */,
[ 'Australia/Lord_Howe', 2011,9,1,15,30,0, 660, 1 ]/* STD: 630 */,
[ 'Australia/Sydney', 2011,9,1,16,0,0, 660, 1 ]/* STD: 600 */,
[ 'Pacific/Fiji', 2011,2,5,14,0,0, 720, 1 ]/* STD: 660 */,
[ 'Pacific/Fiji', 2011,2,26,14,0,0, 720, 1 ]/* STD: 660 */,
[ 'Asia/Kamchatka', 2011,2,26,15,0,0, 720, 1 ]/* STD: 660 */,
[ 'Pacific/Auckland', 2011,8,24,14,0,0, 780, 1 ]/* STD: 720 */,
[ 'Pacific/Chatham', 2011,8,24,14,0,0, 825, 1 ]/* STD: 765 */,
// AND THEN NON-DST TIMEZONES:
[ 'Etc/GMT+12', 2011,0,1,0,0,0, -720, 0 ]/* STD: -720 */,
[ 'Pacific/Pago_Pago', 2011,0,1,0,0,0, -660, 0 ]/* STD: -660 */,
[ 'Pacific/Kiritimati', 2010,0,1,0,0,0, 840, 0, '(LINT)' ], /* To prevent Firefox detecting Pacific/Kiritimati as Pacific Honolulu */
[ 'Pacific/Honolulu', 2011,0,1,0,0,0, -600, 0 ]/* STD: -600 */,
[ 'Pacific/Marquesas', 2011,0,1,0,0,0, -570, 0 ]/* STD: -570 */,
[ 'Pacific/Gambier', 2011,0,1,0,0,0, -540, 0 ]/* STD: -540 */,
[ 'Pacific/Pitcairn', 2011,0,1,0,0,0, -480, 0 ]/* STD: -480 */,
[ 'America/Phoenix', 2011,0,1,0,0,0, -420, 0 ]/* STD: -420 */,
[ 'America/Guatemala', 2011,0,1,0,0,0, -360, 0 ]/* STD: -360 */,
[ 'America/Bogota', 2011,0,1,0,0,0, -300, 0 ]/* STD: -300 */,
[ 'America/Caracas', 2011,0,1,0,0,0, -270, 0 ]/* STD: -270 */,
[ 'America/Santo_Domingo', 2011,0,1,0,0,0, -240, 0 ]/* STD: -240 */,
[ 'America/Argentina/Buenos_Aires', 2011,0,1,0,0,0, -180, 0 ]/* STD: -180 */,
[ 'America/Noronha', 2011,0,1,0,0,0, -120, 0 ]/* STD: -120 */,
[ 'Atlantic/Cape_Verde', 2011,0,1,0,0,0, -60, 0 ]/* STD: -60 */,
[ 'Africa/Casablanca', 2011,0,1,0,0,0, 0, 0 ]/* STD: 0 */,
[ 'Africa/Lagos', 2011,0,1,0,0,0, 60, 0 ]/* STD: 60 */,
[ 'Africa/Johannesburg', 2011,0,1,0,0,0, 120, 0 ]/* STD: 120 */,
[ 'Asia/Baghdad', 2011,0,1,0,0,0, 180, 0 ]/* STD: 180 */,
[ 'Asia/Dubai', 2011,0,1,0,0,0, 240, 0 ]/* STD: 240 */,
[ 'Asia/Kabul', 2011,0,1,0,0,0, 270, 0 ]/* STD: 270 */,
[ 'Asia/Karachi', 2011,0,1,0,0,0, 300, 0 ]/* STD: 300 */,
[ 'Asia/Kolkata', 2011,0,1,0,0,0, 330, 0 ]/* STD: 330 */,
[ 'Asia/Kathmandu', 2011,0,1,0,0,0, 345, 0 ]/* STD: 345 */,
[ 'Asia/Dhaka', 2011,0,1,0,0,0, 360, 0 ]/* STD: 360 */,
[ 'Asia/Rangoon', 2011,0,1,0,0,0, 390, 0 ]/* STD: 390 */,
[ 'Asia/Jakarta', 2011,0,1,0,0,0, 420, 0 ]/* STD: 420 */,
[ 'Asia/Shanghai', 2011,0,1,0,0,0, 480, 0 ]/* STD: 480 */,
[ 'Australia/Eucla', 2011,0,1,0,0,0, 525, 0 ]/* STD: 525 */,
[ 'Asia/Tokyo', 2011,0,1,0,0,0, 540, 0 ]/* STD: 540 */,
[ 'Australia/Darwin', 2011,0,1,0,0,0, 570, 0 ]/* STD: 570 */,
[ 'Australia/Brisbane', 2011,0,1,0,0,0, 600, 0 ]/* STD: 600 */,
[ 'Pacific/Noumea', 2011,0,1,0,0,0, 660, 0 ]/* STD: 660 */,
[ 'Pacific/Norfolk', 2011,0,1,0,0,0, 690, 0 ]/* STD: 690 */,
[ 'Pacific/Tarawa', 2011,0,1,0,0,0, 720, 0 ]/* STD: 720 */,
[ 'Pacific/Tongatapu', 2011,0,1,0,0,0, 780, 0 ]/* STD: 780 */,
[ 'Pacific/Kiritimati', 2011,0,1,0,0,0, 840, 0 ]/* STD: 840 */
)
function get_timezone_id()
{
var tz="";
for (var i in zones)
{
olson_name = zones[i][0];
has_transitions = zones[i][8];
date_1 = new Date(Date.UTC(zones[i][1],zones[i][2],zones[i][3],zones[i][4],zones[i][5],zones[i][6]));
date_1_offset_data = zones[i][7];
date_1_offset_user = -date_1.getTimezoneOffset();
date_2 = new Date(Date.UTC(zones[i][1],zones[i][2],zones[i][3],zones[i][4],zones[i][5],zones[i][6]) - 1000);
date_2_offset_user = -date_2.getTimezoneOffset();
var patt1=/\([^)]+\)/g;
if (zones[i][9] != undefined) var abbr = zones[i][9]; // To determine Pacific/Kiritimati in Firefox
else var abbr = "";
if
(
abbr == date_1.toString().match(patt1)
// Detect timezones that has transitions
|| (has_transitions && date_1_offset_user == date_1_offset_data && date_2_offset_user != date_1_offset_data)
// Detect timezones that has not transitions
|| (!has_transitions && date_1_offset_data == date_1_offset_user)
)
{
tz = olson_name;
return tz;
}
}
}