settimezone - Generando una lista desplegable de zonas horarias con PHP

timezone monterrey php

Question

La mayoría de los sitios necesitan alguna manera de mostrar las fechas en el sitio en la zona horaria preferida de los usuarios. A continuación hay dos listas que encontré y luego un método que usa la clase PHP DateTime incorporada en PHP 5.

Necesito ayuda para saber cuál de estos sería el mejor intento de utilizar al intentar obtener el desplazamiento UTC del usuario al registrarse.

Uno:

<option value="-12">[UTC - 12] Baker Island Time</option>
<option value="-11">[UTC - 11] Niue Time, Samoa Standard Time</option>
<option value="-10">[UTC - 10] Hawaii-Aleutian Standard Time, Cook Island Time</option>
<option value="-9.5">[UTC - 9:30] Marquesas Islands Time</option>
<option value="-9">[UTC - 9] Alaska Standard Time, Gambier Island Time</option>
<option value="-8">[UTC - 8] Pacific Standard Time</option>
<option value="-7">[UTC - 7] Mountain Standard Time</option>
<option value="-6">[UTC - 6] Central Standard Time</option>
<option value="-5">[UTC - 5] Eastern Standard Time</option>
<option value="-4.5">[UTC - 4:30] Venezuelan Standard Time</option>
<option value="-4">[UTC - 4] Atlantic Standard Time</option>
<option value="-3.5">[UTC - 3:30] Newfoundland Standard Time</option>
<option value="-3">[UTC - 3] Amazon Standard Time, Central Greenland Time</option>
<option value="-2">[UTC - 2] Fernando de Noronha Time, South Georgia &amp; the South Sandwich Islands Time</option>
<option value="-1">[UTC - 1] Azores Standard Time, Cape Verde Time, Eastern Greenland Time</option>
<option value="0" selected="selected">[UTC] Western European Time, Greenwich Mean Time</option>
<option value="1">[UTC + 1] Central European Time, West African Time</option>
<option value="2">[UTC + 2] Eastern European Time, Central African Time</option>
<option value="3">[UTC + 3] Moscow Standard Time, Eastern African Time</option>
<option value="3.5">[UTC + 3:30] Iran Standard Time</option>
<option value="4">[UTC + 4] Gulf Standard Time, Samara Standard Time</option>
<option value="4.5">[UTC + 4:30] Afghanistan Time</option>
<option value="5">[UTC + 5] Pakistan Standard Time, Yekaterinburg Standard Time</option>
<option value="5.5">[UTC + 5:30] Indian Standard Time, Sri Lanka Time</option>
<option value="5.75">[UTC + 5:45] Nepal Time</option>
<option value="6">[UTC + 6] Bangladesh Time, Bhutan Time, Novosibirsk Standard Time</option>
<option value="6.5">[UTC + 6:30] Cocos Islands Time, Myanmar Time</option>
<option value="7">[UTC + 7] Indochina Time, Krasnoyarsk Standard Time</option>
<option value="8">[UTC + 8] Chinese Standard Time, Australian Western Standard Time, Irkutsk Standard Time</option>
<option value="8.75">[UTC + 8:45] Southeastern Western Australia Standard Time</option>
<option value="9">[UTC + 9] Japan Standard Time, Korea Standard Time, Chita Standard Time</option>
<option value="9.5">[UTC + 9:30] Australian Central Standard Time</option>
<option value="10">[UTC + 10] Australian Eastern Standard Time, Vladivostok Standard Time</option>
<option value="10.5">[UTC + 10:30] Lord Howe Standard Time</option>
<option value="11">[UTC + 11] Solomon Island Time, Magadan Standard Time</option>
<option value="11.5">[UTC + 11:30] Norfolk Island Time</option>
<option value="12">[UTC + 12] New Zealand Time, Fiji Time, Kamchatka Standard Time</option>
<option value="12.75">[UTC + 12:45] Chatham Islands Time</option>
<option value="13">[UTC + 13] Tonga Time, Phoenix Islands Time</option>
<option value="14">[UTC + 14] Line Island Time</option>

O usando valores amigables de PHP:

<option value="Pacific/Midway">(GMT-11:00) Midway Island, Samoa</option>
<option value="America/Adak">(GMT-10:00) Hawaii-Aleutian</option>
<option value="Etc/GMT+10">(GMT-10:00) Hawaii</option>
<option value="Pacific/Marquesas">(GMT-09:30) Marquesas Islands</option>
<option value="Pacific/Gambier">(GMT-09:00) Gambier Islands</option>
<option value="America/Anchorage">(GMT-09:00) Alaska</option>
<option value="America/Ensenada">(GMT-08:00) Tijuana, Baja California</option>
<option value="Etc/GMT+8">(GMT-08:00) Pitcairn Islands</option>
<option value="America/Los_Angeles">(GMT-08:00) Pacific Time (US & Canada)</option>
<option value="America/Denver">(GMT-07:00) Mountain Time (US & Canada)</option>
<option value="America/Chihuahua">(GMT-07:00) Chihuahua, La Paz, Mazatlan</option>
<option value="America/Dawson_Creek">(GMT-07:00) Arizona</option>
<option value="America/Belize">(GMT-06:00) Saskatchewan, Central America</option>
<option value="America/Cancun">(GMT-06:00) Guadalajara, Mexico City, Monterrey</option>
<option value="Chile/EasterIsland">(GMT-06:00) Easter Island</option>
<option value="America/Chicago">(GMT-06:00) Central Time (US & Canada)</option>
<option value="America/New_York">(GMT-05:00) Eastern Time (US & Canada)</option>
<option value="America/Havana">(GMT-05:00) Cuba</option>
<option value="America/Bogota">(GMT-05:00) Bogota, Lima, Quito, Rio Branco</option>
<option value="America/Caracas">(GMT-04:30) Caracas</option>
<option value="America/Santiago">(GMT-04:00) Santiago</option>
<option value="America/La_Paz">(GMT-04:00) La Paz</option>
<option value="Atlantic/Stanley">(GMT-04:00) Faukland Islands</option>
<option value="America/Campo_Grande">(GMT-04:00) Brazil</option>
<option value="America/Goose_Bay">(GMT-04:00) Atlantic Time (Goose Bay)</option>
<option value="America/Glace_Bay">(GMT-04:00) Atlantic Time (Canada)</option>
<option value="America/St_Johns">(GMT-03:30) Newfoundland</option>
<option value="America/Araguaina">(GMT-03:00) UTC-3</option>
<option value="America/Montevideo">(GMT-03:00) Montevideo</option>
<option value="America/Miquelon">(GMT-03:00) Miquelon, St. Pierre</option>
<option value="America/Godthab">(GMT-03:00) Greenland</option>
<option value="America/Argentina/Buenos_Aires">(GMT-03:00) Buenos Aires</option>
<option value="America/Sao_Paulo">(GMT-03:00) Brasilia</option>
<option value="America/Noronha">(GMT-02:00) Mid-Atlantic</option>
<option value="Atlantic/Cape_Verde">(GMT-01:00) Cape Verde Is.</option>
<option value="Atlantic/Azores">(GMT-01:00) Azores</option>
<option value="Europe/Belfast">(GMT) Greenwich Mean Time : Belfast</option>
<option value="Europe/Dublin">(GMT) Greenwich Mean Time : Dublin</option>
<option value="Europe/Lisbon">(GMT) Greenwich Mean Time : Lisbon</option>
<option value="Europe/London">(GMT) Greenwich Mean Time : London</option>
<option value="Africa/Abidjan">(GMT) Monrovia, Reykjavik</option>
<option value="Europe/Amsterdam">(GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna</option>
<option value="Europe/Belgrade">(GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague</option>
<option value="Europe/Brussels">(GMT+01:00) Brussels, Copenhagen, Madrid, Paris</option>
<option value="Africa/Algiers">(GMT+01:00) West Central Africa</option>
<option value="Africa/Windhoek">(GMT+01:00) Windhoek</option>
<option value="Asia/Beirut">(GMT+02:00) Beirut</option>
<option value="Africa/Cairo">(GMT+02:00) Cairo</option>
<option value="Asia/Gaza">(GMT+02:00) Gaza</option>
<option value="Africa/Blantyre">(GMT+02:00) Harare, Pretoria</option>
<option value="Asia/Jerusalem">(GMT+02:00) Jerusalem</option>
<option value="Europe/Minsk">(GMT+02:00) Minsk</option>
<option value="Asia/Damascus">(GMT+02:00) Syria</option>
<option value="Europe/Moscow">(GMT+03:00) Moscow, St. Petersburg, Volgograd</option>
<option value="Africa/Addis_Ababa">(GMT+03:00) Nairobi</option>
<option value="Asia/Tehran">(GMT+03:30) Tehran</option>
<option value="Asia/Dubai">(GMT+04:00) Abu Dhabi, Muscat</option>
<option value="Asia/Yerevan">(GMT+04:00) Yerevan</option>
<option value="Asia/Kabul">(GMT+04:30) Kabul</option>
<option value="Asia/Yekaterinburg">(GMT+05:00) Ekaterinburg</option>
<option value="Asia/Tashkent">(GMT+05:00) Tashkent</option>
<option value="Asia/Kolkata">(GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi</option>
<option value="Asia/Katmandu">(GMT+05:45) Kathmandu</option>
<option value="Asia/Dhaka">(GMT+06:00) Astana, Dhaka</option>
<option value="Asia/Novosibirsk">(GMT+06:00) Novosibirsk</option>
<option value="Asia/Rangoon">(GMT+06:30) Yangon (Rangoon)</option>
<option value="Asia/Bangkok">(GMT+07:00) Bangkok, Hanoi, Jakarta</option>
<option value="Asia/Krasnoyarsk">(GMT+07:00) Krasnoyarsk</option>
<option value="Asia/Hong_Kong">(GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi</option>
<option value="Asia/Irkutsk">(GMT+08:00) Irkutsk, Ulaan Bataar</option>
<option value="Australia/Perth">(GMT+08:00) Perth</option>
<option value="Australia/Eucla">(GMT+08:45) Eucla</option>
<option value="Asia/Tokyo">(GMT+09:00) Osaka, Sapporo, Tokyo</option>
<option value="Asia/Seoul">(GMT+09:00) Seoul</option>
<option value="Asia/Yakutsk">(GMT+09:00) Yakutsk</option>
<option value="Australia/Adelaide">(GMT+09:30) Adelaide</option>
<option value="Australia/Darwin">(GMT+09:30) Darwin</option>
<option value="Australia/Brisbane">(GMT+10:00) Brisbane</option>
<option value="Australia/Hobart">(GMT+10:00) Hobart</option>
<option value="Asia/Vladivostok">(GMT+10:00) Vladivostok</option>
<option value="Australia/Lord_Howe">(GMT+10:30) Lord Howe Island</option>
<option value="Etc/GMT-11">(GMT+11:00) Solomon Is., New Caledonia</option>
<option value="Asia/Magadan">(GMT+11:00) Magadan</option>
<option value="Pacific/Norfolk">(GMT+11:30) Norfolk Island</option>
<option value="Asia/Anadyr">(GMT+12:00) Anadyr, Kamchatka</option>
<option value="Pacific/Auckland">(GMT+12:00) Auckland, Wellington</option>
<option value="Etc/GMT-12">(GMT+12:00) Fiji, Kamchatka, Marshall Is.</option>
<option value="Pacific/Chatham">(GMT+12:45) Chatham Islands</option>
<option value="Pacific/Tongatapu">(GMT+13:00) Nuku''alofa</option>
<option value="Pacific/Kiritimati">(GMT+14:00) Kiritimati</option>

O simplemente usando PHP en sí:

$timezones = DateTimeZone::listAbbreviations();
$cities = array();
foreach( $timezones as $key => $zones )
{
foreach( $zones as $id => $zone )
{
/**
* Only get timezones explicitely not part of "Others".
* @see http://www.php.net/manual/en/timezones.others.php
*/
if ( preg_match( ''/^(America|Antartica|Arctic|Asia|Atlantic|Europe|Indian|Pacific)///'', $zone[''timezone_id''] )
&& $zone[''timezone_id'']) {
$cities[$zone[''timezone_id'']][] = $key;
}
}
}
// For each city, have a comma separated list of all possible timezones for that city.
foreach( $cities as $key => $value )
$cities[$key] = join( '', '', $value);
// Only keep one city (the first and also most important) for each set of possibilities.
$cities = array_unique( $cities );
// Sort by area/city name.
ksort( $cities );

Parece que el último sería el más seguro, ya que crecería con la versión PHP que se utiliza. También podría voltear esa matriz cuando sea necesario para unir zonas horarias con nombres de ciudades.

Answer 1

A pesar del número de respuestas existentes, he hecho otra solución a este problema. Los profesionales de mi implementación son:

• La lista de zonas horarias se genera dinámicamente y, por lo tanto, se actualiza automáticamente cuando las zonas horarias pueden cambiar (en PHP).
• Los nombres de las zonas horarias están embellecidos. Por ejemplo, "America / St_Barthelemy" se convierte en "América, San Bartolomé".
• Las zonas horarias se ordenan en offset y nombre. La respuesta de Toland solo ordena en offset, lo que da como resultado grupos de zonas horarias sin clasificar dentro del mismo desplazamiento.
• La información de compensación no se recupera de DateTimeZone::listAbbreviations , ya que ese método también devuelve información histórica de la zona horaria . La respuesta de Favio utiliza este método, que da como resultado compensaciones incorrectas (históricas)
• La lista de zonas horarias solo se genera cuando se solicita por primera vez (y se "almacena en caché" utilizando una variable estática).

Aquí está el código completo:

function timezone_list() {
static $timezones = null;
if ($timezones === null) {
$timezones = [];
$offsets = [];
$now = new DateTime(''now'', new DateTimeZone(''UTC''));
foreach (DateTimeZone::listIdentifiers() as $timezone) {
$now->setTimezone(new DateTimeZone($timezone));
$offsets[] = $offset = $now->getOffset();
$timezones[$timezone] = ''('' . format_GMT_offset($offset) . '') '' . format_timezone_name($timezone);
}
array_multisort($offsets, $timezones);
}
return $timezones;
}
function format_GMT_offset($offset) {
$hours = intval($offset / 3600);
$minutes = abs(intval($offset % 3600 / 60));
return ''GMT'' . ($offset ? sprintf(''%+03d:%02d'', $hours, $minutes) : '''');
}
function format_timezone_name($name) {
$name = str_replace(''/'', '', '', $name);
$name = str_replace(''_'', '' '', $name);
$name = str_replace(''St '', ''St. '', $name);
return $name;
}

Y aquí hay un ejemplo de la salida

Array
(
[Pacific/Midway] => (GMT-11:00) Pacific, Midway
[Pacific/Niue] => (GMT-11:00) Pacific, Niue
[Pacific/Pago_Pago] => (GMT-11:00) Pacific, Pago Pago
[America/Adak] => (GMT-10:00) America, Adak
[Pacific/Honolulu] => (GMT-10:00) Pacific, Honolulu
[Pacific/Johnston] => (GMT-10:00) Pacific, Johnston
[Pacific/Rarotonga] => (GMT-10:00) Pacific, Rarotonga
[Pacific/Tahiti] => (GMT-10:00) Pacific, Tahiti
[Pacific/Marquesas] => (GMT-09:30) Pacific, Marquesas
[America/Anchorage] => (GMT-09:00) America, Anchorage
...
)

Answer 2

Editando la respuesta de Tamas para eliminar todas las "otras" entradas que el sitio de php.net dice ya no debería ser utilizado.

Tal vez no importe, pero solo siga las mejores prácticas. Ver aviso en la parte inferior de: http://fr2.php.net/manual/en/timezones.others.php

Además, aunque esta lista tiene las Azores como GMT -1, de hecho creo que es la misma (al menos algunas veces) que GMT, pero no estoy seguro.

Edición para ofrecer esto en sql para que pueda crear la lista desplegable en un formulario y tener la respuesta del usuario vinculada a un índice en su lugar.

Edición de nuevo para eliminar el espacio inicial

CREATE TABLE IF NOT EXISTS `timezones` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(44) DEFAULT NULL,
`timezone` varchar(30) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=141 ;
--
-- Dumping data for table `timezones`
--
INSERT INTO `timezones` (`id`, `name`, `timezone`) VALUES
(1, ''(GMT-11:00) Midway Island '', ''Pacific/Midway''),
(2, ''(GMT-11:00) Samoa '', ''Pacific/Samoa''),
(3, ''(GMT-10:00) Hawaii '', ''Pacific/Honolulu''),
(4, ''(GMT-09:00) Alaska '', ''America/Anchorage''),
(5, ''(GMT-08:00) Pacific Time (US & Canada) '', ''America/Los_Angeles''),
(6, ''(GMT-08:00) Tijuana '', ''America/Tijuana''),
(7, ''(GMT-07:00) Chihuahua '', ''America/Chihuahua''),
(8, ''(GMT-07:00) La Paz '', ''America/Chihuahua''),
(9, ''(GMT-07:00) Mazatlan '', ''America/Mazatlan''),
(10, ''(GMT-07:00) Mountain Time (US & Canada) '', ''America/Denver''),
(11, ''(GMT-06:00) Central America '', ''America/Managua''),
(12, ''(GMT-06:00) Central Time (US & Canada) '', ''America/Chicago''),
(13, ''(GMT-06:00) Guadalajara '', ''America/Mexico_City''),
(14, ''(GMT-06:00) Mexico City '', ''America/Mexico_City''),
(15, ''(GMT-06:00) Monterrey '', ''America/Monterrey''),
(16, ''(GMT-05:00) Bogota '', ''America/Bogota''),
(17, ''(GMT-05:00) Eastern Time (US & Canada) '', ''America/New_York''),
(18, ''(GMT-05:00) Lima '', ''America/Lima''),
(19, ''(GMT-05:00) Quito '', ''America/Bogota''),
(20, ''(GMT-04:00) Atlantic Time (Canada) '', ''Canada/Atlantic''),
(21, ''(GMT-04:30) Caracas '', ''America/Caracas''),
(22, ''(GMT-04:00) La Paz '', ''America/La_Paz''),
(23, ''(GMT-04:00) Santiago '', ''America/Santiago''),
(24, ''(GMT-03:30) Newfoundland '', ''America/St_Johns''),
(25, ''(GMT-03:00) Brasilia '', ''America/Sao_Paulo''),
(26, ''(GMT-03:00) Buenos Aires '', ''America/Argentina/Buenos_Aires''),
(27, ''(GMT-03:00) Georgetown '', ''America/Argentina/Buenos_Aires''),
(28, ''(GMT-03:00) Greenland '', ''America/Godthab''),
(29, ''(GMT-02:00) Mid-Atlantic '', ''America/Noronha''),
(30, ''(GMT-01:00) Azores '', ''Atlantic/Azores''),
(31, ''(GMT-01:00) Cape Verde Is. '', ''Atlantic/Cape_Verde''),
(32, ''(GMT+00:00) Casablanca '', ''Africa/Casablanca''),
(33, ''(GMT+00:00) Edinburgh '', ''Europe/London''),
(34, ''(GMT+00:00) Dublin '', ''Europe/Dublin''),
(35, ''(GMT+00:00) Lisbon '', ''Europe/Lisbon''),
(36, ''(GMT+00:00) London '', ''Europe/London''),
(37, ''(GMT+00:00) Monrovia '', ''Africa/Monrovia''),
(38, ''(GMT+00:00) UTC '', ''UTC''),
(39, ''(GMT+01:00) Amsterdam '', ''Europe/Amsterdam''),
(40, ''(GMT+01:00) Belgrade '', ''Europe/Belgrade''),
(41, ''(GMT+01:00) Berlin '', ''Europe/Berlin''),
(42, ''(GMT+01:00) Bern '', ''Europe/Berlin''),
(43, ''(GMT+01:00) Bratislava '', ''Europe/Bratislava''),
(44, ''(GMT+01:00) Brussels '', ''Europe/Brussels''),
(45, ''(GMT+01:00) Budapest '', ''Europe/Budapest''),
(46, ''(GMT+01:00) Copenhagen '', ''Europe/Copenhagen''),
(47, ''(GMT+01:00) Ljubljana '', ''Europe/Ljubljana''),
(48, ''(GMT+01:00) Madrid '', ''Europe/Madrid''),
(49, ''(GMT+01:00) Paris '', ''Europe/Paris''),
(50, ''(GMT+01:00) Prague '', ''Europe/Prague''),
(51, ''(GMT+01:00) Rome '', ''Europe/Rome''),
(52, ''(GMT+01:00) Sarajevo '', ''Europe/Sarajevo''),
(53, ''(GMT+01:00) Skopje '', ''Europe/Skopje''),
(54, ''(GMT+01:00) Stockholm '', ''Europe/Stockholm''),
(55, ''(GMT+01:00) Vienna '', ''Europe/Vienna''),
(56, ''(GMT+01:00) Warsaw '', ''Europe/Warsaw''),
(57, ''(GMT+01:00) West Central Africa '', ''Africa/Lagos''),
(58, ''(GMT+01:00) Zagreb '', ''Europe/Zagreb''),
(59, ''(GMT+02:00) Athens '', ''Europe/Athens''),
(60, ''(GMT+02:00) Bucharest '', ''Europe/Bucharest''),
(61, ''(GMT+02:00) Cairo '', ''Africa/Cairo''),
(62, ''(GMT+02:00) Harare '', ''Africa/Harare''),
(63, ''(GMT+02:00) Helsinki '', ''Europe/Helsinki''),
(64, ''(GMT+02:00) Istanbul '', ''Europe/Istanbul''),
(65, ''(GMT+02:00) Jerusalem '', ''Asia/Jerusalem''),
(66, ''(GMT+02:00) Kyiv '', ''Europe/Helsinki''),
(67, ''(GMT+02:00) Pretoria '', ''Africa/Johannesburg''),
(68, ''(GMT+02:00) Riga '', ''Europe/Riga''),
(69, ''(GMT+02:00) Sofia '', ''Europe/Sofia''),
(70, ''(GMT+02:00) Tallinn '', ''Europe/Tallinn''),
(71, ''(GMT+02:00) Vilnius '', ''Europe/Vilnius''),
(72, ''(GMT+03:00) Baghdad '', ''Asia/Baghdad''),
(73, ''(GMT+03:00) Kuwait '', ''Asia/Kuwait''),
(74, ''(GMT+03:00) Minsk '', ''Europe/Minsk''),
(75, ''(GMT+03:00) Nairobi '', ''Africa/Nairobi''),
(76, ''(GMT+03:00) Riyadh '', ''Asia/Riyadh''),
(77, ''(GMT+03:00) Volgograd '', ''Europe/Volgograd''),
(78, ''(GMT+03:30) Tehran '', ''Asia/Tehran''),
(79, ''(GMT+04:00) Abu Dhabi '', ''Asia/Muscat''),
(80, ''(GMT+04:00) Baku '', ''Asia/Baku''),
(81, ''(GMT+04:00) Moscow '', ''Europe/Moscow''),
(82, ''(GMT+04:00) Muscat '', ''Asia/Muscat''),
(83, ''(GMT+04:00) St. Petersburg '', ''Europe/Moscow''),
(84, ''(GMT+04:00) Tbilisi '', ''Asia/Tbilisi''),
(85, ''(GMT+04:00) Yerevan '', ''Asia/Yerevan''),
(86, ''(GMT+04:30) Kabul '', ''Asia/Kabul''),
(87, ''(GMT+05:00) Islamabad '', ''Asia/Karachi''),
(88, ''(GMT+05:00) Karachi '', ''Asia/Karachi''),
(89, ''(GMT+05:00) Tashkent '', ''Asia/Tashkent''),
(90, ''(GMT+05:30) Chennai '', ''Asia/Calcutta''),
(91, ''(GMT+05:30) Kolkata '', ''Asia/Kolkata''),
(92, ''(GMT+05:30) Mumbai '', ''Asia/Calcutta''),
(93, ''(GMT+05:30) New Delhi '', ''Asia/Calcutta''),
(94, ''(GMT+05:30) Sri Jayawardenepura '', ''Asia/Calcutta''),
(95, ''(GMT+05:45) Kathmandu '', ''Asia/Katmandu''),
(96, ''(GMT+06:00) Almaty '', ''Asia/Almaty''),
(97, ''(GMT+06:00) Astana '', ''Asia/Dhaka''),
(98, ''(GMT+06:00) Dhaka '', ''Asia/Dhaka''),
(99, ''(GMT+06:00) Ekaterinburg '', ''Asia/Yekaterinburg''),
(100, ''(GMT+06:30) Rangoon '', ''Asia/Rangoon''),
(101, ''(GMT+07:00) Bangkok '', ''Asia/Bangkok''),
(102, ''(GMT+07:00) Hanoi '', ''Asia/Bangkok''),
(103, ''(GMT+07:00) Jakarta '', ''Asia/Jakarta''),
(104, ''(GMT+07:00) Novosibirsk '', ''Asia/Novosibirsk''),
(105, ''(GMT+08:00) Beijing '', ''Asia/Hong_Kong''),
(106, ''(GMT+08:00) Chongqing '', ''Asia/Chongqing''),
(107, ''(GMT+08:00) Hong Kong '', ''Asia/Hong_Kong''),
(108, ''(GMT+08:00) Krasnoyarsk '', ''Asia/Krasnoyarsk''),
(109, ''(GMT+08:00) Kuala Lumpur '', ''Asia/Kuala_Lumpur''),
(110, ''(GMT+08:00) Perth '', ''Australia/Perth''),
(111, ''(GMT+08:00) Singapore '', ''Asia/Singapore''),
(112, ''(GMT+08:00) Taipei '', ''Asia/Taipei''),
(113, ''(GMT+08:00) Ulaan Bataar '', ''Asia/Ulan_Bator''),
(114, ''(GMT+08:00) Urumqi '', ''Asia/Urumqi''),
(115, ''(GMT+09:00) Irkutsk '', ''Asia/Irkutsk''),
(116, ''(GMT+09:00) Osaka '', ''Asia/Tokyo''),
(117, ''(GMT+09:00) Sapporo '', ''Asia/Tokyo''),
(118, ''(GMT+09:00) Seoul '', ''Asia/Seoul''),
(119, ''(GMT+09:00) Tokyo '', ''Asia/Tokyo''),
(120, ''(GMT+09:30) Adelaide '', ''Australia/Adelaide''),
(121, ''(GMT+09:30) Darwin '', ''Australia/Darwin''),
(122, ''(GMT+10:00) Brisbane '', ''Australia/Brisbane''),
(123, ''(GMT+10:00) Canberra '', ''Australia/Canberra''),
(124, ''(GMT+10:00) Guam '', ''Pacific/Guam''),
(125, ''(GMT+10:00) Hobart '', ''Australia/Hobart''),
(126, ''(GMT+10:00) Melbourne '', ''Australia/Melbourne''),
(127, ''(GMT+10:00) Port Moresby '', ''Pacific/Port_Moresby''),
(128, ''(GMT+10:00) Sydney '', ''Australia/Sydney''),
(129, ''(GMT+10:00) Yakutsk '', ''Asia/Yakutsk''),
(130, ''(GMT+11:00) Vladivostok '', ''Asia/Vladivostok''),
(131, ''(GMT+12:00) Auckland '', ''Pacific/Auckland''),
(132, ''(GMT+12:00) Fiji '', ''Pacific/Fiji''),
(133, ''(GMT+12:00) International Date Line West '', ''Pacific/Kwajalein''),
(134, ''(GMT+12:00) Kamchatka '', ''Asia/Kamchatka''),
(135, ''(GMT+12:00) Magadan '', ''Asia/Magadan''),
(136, ''(GMT+12:00) Marshall Is. '', ''Pacific/Fiji''),
(137, ''(GMT+12:00) New Caledonia '', ''Asia/Magadan''),
(138, ''(GMT+12:00) Solomon Is. '', ''Asia/Magadan''),
(139, ''(GMT+12:00) Wellington '', ''Pacific/Auckland''),
(140, ''(GMT+13:00) Nuku//alofa '', ''Pacific/Tongatapu'');
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

Answer 3

Lo haría con el siguiente código, que es similar a la respuesta aceptada (soy consciente de que el código podría ser refactorizado :)):

 $list = DateTimeZone::listAbbreviations();
$idents = DateTimeZone::listIdentifiers();
$data = $offset = $added = array();
foreach ($list as $abbr => $info) {
foreach ($info as $zone) {
if ( ! empty($zone[''timezone_id''])
AND
! in_array($zone[''timezone_id''], $added)
AND
in_array($zone[''timezone_id''], $idents)) {
$z = new DateTimeZone($zone[''timezone_id'']);
$c = new DateTime(null, $z);
$zone[''time''] = $c->format(''H:i a'');
$data[] = $zone;
$offset[] = $z->getOffset($c);
$added[] = $zone[''timezone_id''];
}
}
}
array_multisort($offset, SORT_ASC, $data);
$options = array();
foreach ($data as $key => $row) {
$options[$row[''timezone_id'']] = $row[''time''] . '' - ''
. formatOffset($row[''offset''])
. '' '' . $row[''timezone_id''];
}
// now you can use $options;
function formatOffset($offset) {
$hours = $offset / 3600;
$remainder = $offset % 3600;
$sign = $hours > 0 ? ''+'' : ''-'';
$hour = (int) abs($hours);
$minutes = (int) abs($remainder / 60);
if ($hour == 0 AND $minutes == 0) {
$sign = '' '';
}
return ''GMT'' . $sign . str_pad($hour, 2, ''0'', STR_PAD_LEFT)
.'':''. str_pad($minutes,2, ''0'');
}

Produce algo como:

<option value="America/Boise" label="02:10 am - GMT-06:00 America/Boise">02:10 am - GMT-06:00 America/Boise</option>
<option value="America/Denver" label="02:10 am - GMT-06:00 America/Denver">02:10 am - GMT-06:00 America/Denver</option>
<option value="America/Edmonton" label="02:10 am - GMT-06:00 America/Edmonton">02:10 am - GMT-06:00 America/Edmonton</option>
<option value="America/Inuvik" label="02:10 am - GMT-06:00 America/Inuvik">02:10 am - GMT-06:00 America/Inuvik</option>
<option value="America/Shiprock" label="02:10 am - GMT-06:00 America/Shiprock">02:10 am - GMT-06:00 America/Shiprock</option>
<option value="America/Belize" label="02:10 am - GMT-05:00 America/Belize">02:10 am - GMT-05:00 America/Belize</option>

Espero que eso ayude un poco y / o te inspire a venir con algo mejor.

Answer 4

Lo haría en PHP, pero evitaría hacer preg_match 100 algunas veces y hacer esto para generar tu lista.

$tzlist = DateTimeZone::listIdentifiers(DateTimeZone::ALL);

Además, utilizaría los nombres de PHP para las ''zonas horarias'' y me olvidaría de las compensaciones GMT, que cambiarán en base al horario de verano. Un código como ese en phpbb es solo de esa manera, porque aun así soportan PHP4 y no pueden confiar en que los objetos DateTime o DateTimeZone estén ahí.

Answer 5

Puede crear un menú desplegable muy fácil desde esta matriz (fue una tarea que requirió mucho tiempo juntar esto y probarlo). Ya usamos esta lista en algunas de nuestras aplicaciones.

Es muy importante almacenar los identificadores de zona horaria en su base de datos y no solo el desplazamiento de la zona horaria como "GMT + 2", debido a los Horario de verano.

ACTUALIZAR

Actualicé / corrigí la lista de zonas horarias (también pago y envío: https://github.com/paptamas/timezones ):

<?php
$timezones = array (
''(GMT-11:00) Midway Island'' => ''Pacific/Midway'',
''(GMT-11:00) Samoa'' => ''Pacific/Samoa'',
''(GMT-10:00) Hawaii'' => ''Pacific/Honolulu'',
''(GMT-09:00) Alaska'' => ''US/Alaska'',
''(GMT-08:00) Pacific Time (US &amp; Canada)'' => ''America/Los_Angeles'',
''(GMT-08:00) Tijuana'' => ''America/Tijuana'',
''(GMT-07:00) Arizona'' => ''US/Arizona'',
''(GMT-07:00) Chihuahua'' => ''America/Chihuahua'',
''(GMT-07:00) La Paz'' => ''America/Chihuahua'',
''(GMT-07:00) Mazatlan'' => ''America/Mazatlan'',
''(GMT-07:00) Mountain Time (US &amp; Canada)'' => ''US/Mountain'',
''(GMT-06:00) Central America'' => ''America/Managua'',
''(GMT-06:00) Central Time (US &amp; Canada)'' => ''US/Central'',
''(GMT-06:00) Guadalajara'' => ''America/Mexico_City'',
''(GMT-06:00) Mexico City'' => ''America/Mexico_City'',
''(GMT-06:00) Monterrey'' => ''America/Monterrey'',
''(GMT-06:00) Saskatchewan'' => ''Canada/Saskatchewan'',
''(GMT-05:00) Bogota'' => ''America/Bogota'',
''(GMT-05:00) Eastern Time (US &amp; Canada)'' => ''US/Eastern'',
''(GMT-05:00) Indiana (East)'' => ''US/East-Indiana'',
''(GMT-05:00) Lima'' => ''America/Lima'',
''(GMT-05:00) Quito'' => ''America/Bogota'',
''(GMT-04:00) Atlantic Time (Canada)'' => ''Canada/Atlantic'',
''(GMT-04:30) Caracas'' => ''America/Caracas'',
''(GMT-04:00) La Paz'' => ''America/La_Paz'',
''(GMT-04:00) Santiago'' => ''America/Santiago'',
''(GMT-03:30) Newfoundland'' => ''Canada/Newfoundland'',
''(GMT-03:00) Brasilia'' => ''America/Sao_Paulo'',
''(GMT-03:00) Buenos Aires'' => ''America/Argentina/Buenos_Aires'',
''(GMT-03:00) Georgetown'' => ''America/Argentina/Buenos_Aires'',
''(GMT-03:00) Greenland'' => ''America/Godthab'',
''(GMT-02:00) Mid-Atlantic'' => ''America/Noronha'',
''(GMT-01:00) Azores'' => ''Atlantic/Azores'',
''(GMT-01:00) Cape Verde Is.'' => ''Atlantic/Cape_Verde'',
''(GMT+00:00) Casablanca'' => ''Africa/Casablanca'',
''(GMT+00:00) Edinburgh'' => ''Europe/London'',
''(GMT+00:00) Greenwich Mean Time : Dublin'' => ''Etc/Greenwich'',
''(GMT+00:00) Lisbon'' => ''Europe/Lisbon'',
''(GMT+00:00) London'' => ''Europe/London'',
''(GMT+00:00) Monrovia'' => ''Africa/Monrovia'',
''(GMT+00:00) UTC'' => ''UTC'',
''(GMT+01:00) Amsterdam'' => ''Europe/Amsterdam'',
''(GMT+01:00) Belgrade'' => ''Europe/Belgrade'',
''(GMT+01:00) Berlin'' => ''Europe/Berlin'',
''(GMT+01:00) Bern'' => ''Europe/Berlin'',
''(GMT+01:00) Bratislava'' => ''Europe/Bratislava'',
''(GMT+01:00) Brussels'' => ''Europe/Brussels'',
''(GMT+01:00) Budapest'' => ''Europe/Budapest'',
''(GMT+01:00) Copenhagen'' => ''Europe/Copenhagen'',
''(GMT+01:00) Ljubljana'' => ''Europe/Ljubljana'',
''(GMT+01:00) Madrid'' => ''Europe/Madrid'',
''(GMT+01:00) Paris'' => ''Europe/Paris'',
''(GMT+01:00) Prague'' => ''Europe/Prague'',
''(GMT+01:00) Rome'' => ''Europe/Rome'',
''(GMT+01:00) Sarajevo'' => ''Europe/Sarajevo'',
''(GMT+01:00) Skopje'' => ''Europe/Skopje'',
''(GMT+01:00) Stockholm'' => ''Europe/Stockholm'',
''(GMT+01:00) Vienna'' => ''Europe/Vienna'',
''(GMT+01:00) Warsaw'' => ''Europe/Warsaw'',
''(GMT+01:00) West Central Africa'' => ''Africa/Lagos'',
''(GMT+01:00) Zagreb'' => ''Europe/Zagreb'',
''(GMT+02:00) Athens'' => ''Europe/Athens'',
''(GMT+02:00) Bucharest'' => ''Europe/Bucharest'',
''(GMT+02:00) Cairo'' => ''Africa/Cairo'',
''(GMT+02:00) Harare'' => ''Africa/Harare'',
''(GMT+02:00) Helsinki'' => ''Europe/Helsinki'',
''(GMT+02:00) Istanbul'' => ''Europe/Istanbul'',
''(GMT+02:00) Jerusalem'' => ''Asia/Jerusalem'',
''(GMT+02:00) Kyiv'' => ''Europe/Helsinki'',
''(GMT+02:00) Pretoria'' => ''Africa/Johannesburg'',
''(GMT+02:00) Riga'' => ''Europe/Riga'',
''(GMT+02:00) Sofia'' => ''Europe/Sofia'',
''(GMT+02:00) Tallinn'' => ''Europe/Tallinn'',
''(GMT+02:00) Vilnius'' => ''Europe/Vilnius'',
''(GMT+03:00) Baghdad'' => ''Asia/Baghdad'',
''(GMT+03:00) Kuwait'' => ''Asia/Kuwait'',
''(GMT+03:00) Minsk'' => ''Europe/Minsk'',
''(GMT+03:00) Nairobi'' => ''Africa/Nairobi'',
''(GMT+03:00) Riyadh'' => ''Asia/Riyadh'',
''(GMT+03:00) Volgograd'' => ''Europe/Volgograd'',
''(GMT+03:30) Tehran'' => ''Asia/Tehran'',
''(GMT+04:00) Abu Dhabi'' => ''Asia/Muscat'',
''(GMT+04:00) Baku'' => ''Asia/Baku'',
''(GMT+04:00) Moscow'' => ''Europe/Moscow'',
''(GMT+04:00) Muscat'' => ''Asia/Muscat'',
''(GMT+04:00) St. Petersburg'' => ''Europe/Moscow'',
''(GMT+04:00) Tbilisi'' => ''Asia/Tbilisi'',
''(GMT+04:00) Yerevan'' => ''Asia/Yerevan'',
''(GMT+04:30) Kabul'' => ''Asia/Kabul'',
''(GMT+05:00) Islamabad'' => ''Asia/Karachi'',
''(GMT+05:00) Karachi'' => ''Asia/Karachi'',
''(GMT+05:00) Tashkent'' => ''Asia/Tashkent'',
''(GMT+05:30) Chennai'' => ''Asia/Calcutta'',
''(GMT+05:30) Kolkata'' => ''Asia/Kolkata'',
''(GMT+05:30) Mumbai'' => ''Asia/Calcutta'',
''(GMT+05:30) New Delhi'' => ''Asia/Calcutta'',
''(GMT+05:30) Sri Jayawardenepura'' => ''Asia/Calcutta'',
''(GMT+05:45) Kathmandu'' => ''Asia/Katmandu'',
''(GMT+06:00) Almaty'' => ''Asia/Almaty'',
''(GMT+06:00) Astana'' => ''Asia/Dhaka'',
''(GMT+06:00) Dhaka'' => ''Asia/Dhaka'',
''(GMT+06:00) Ekaterinburg'' => ''Asia/Yekaterinburg'',
''(GMT+06:30) Rangoon'' => ''Asia/Rangoon'',
''(GMT+07:00) Bangkok'' => ''Asia/Bangkok'',
''(GMT+07:00) Hanoi'' => ''Asia/Bangkok'',
''(GMT+07:00) Jakarta'' => ''Asia/Jakarta'',
''(GMT+07:00) Novosibirsk'' => ''Asia/Novosibirsk'',
''(GMT+08:00) Beijing'' => ''Asia/Hong_Kong'',
''(GMT+08:00) Chongqing'' => ''Asia/Chongqing'',
''(GMT+08:00) Hong Kong'' => ''Asia/Hong_Kong'',
''(GMT+08:00) Krasnoyarsk'' => ''Asia/Krasnoyarsk'',
''(GMT+08:00) Kuala Lumpur'' => ''Asia/Kuala_Lumpur'',
''(GMT+08:00) Perth'' => ''Australia/Perth'',
''(GMT+08:00) Singapore'' => ''Asia/Singapore'',
''(GMT+08:00) Taipei'' => ''Asia/Taipei'',
''(GMT+08:00) Ulaan Bataar'' => ''Asia/Ulan_Bator'',
''(GMT+08:00) Urumqi'' => ''Asia/Urumqi'',
''(GMT+09:00) Irkutsk'' => ''Asia/Irkutsk'',
''(GMT+09:00) Osaka'' => ''Asia/Tokyo'',
''(GMT+09:00) Sapporo'' => ''Asia/Tokyo'',
''(GMT+09:00) Seoul'' => ''Asia/Seoul'',
''(GMT+09:00) Tokyo'' => ''Asia/Tokyo'',
''(GMT+09:30) Adelaide'' => ''Australia/Adelaide'',
''(GMT+09:30) Darwin'' => ''Australia/Darwin'',
''(GMT+10:00) Brisbane'' => ''Australia/Brisbane'',
''(GMT+10:00) Canberra'' => ''Australia/Canberra'',
''(GMT+10:00) Guam'' => ''Pacific/Guam'',
''(GMT+10:00) Hobart'' => ''Australia/Hobart'',
''(GMT+10:00) Melbourne'' => ''Australia/Melbourne'',
''(GMT+10:00) Port Moresby'' => ''Pacific/Port_Moresby'',
''(GMT+10:00) Sydney'' => ''Australia/Sydney'',
''(GMT+10:00) Yakutsk'' => ''Asia/Yakutsk'',
''(GMT+11:00) Vladivostok'' => ''Asia/Vladivostok'',
''(GMT+12:00) Auckland'' => ''Pacific/Auckland'',
''(GMT+12:00) Fiji'' => ''Pacific/Fiji'',
''(GMT+12:00) International Date Line West'' => ''Pacific/Kwajalein'',
''(GMT+12:00) Kamchatka'' => ''Asia/Kamchatka'',
''(GMT+12:00) Magadan'' => ''Asia/Magadan'',
''(GMT+12:00) Marshall Is.'' => ''Pacific/Fiji'',
''(GMT+12:00) New Caledonia'' => ''Asia/Magadan'',
''(GMT+12:00) Solomon Is.'' => ''Asia/Magadan'',
''(GMT+12:00) Wellington'' => ''Pacific/Auckland'',
''(GMT+13:00) Nuku/'alofa'' => ''Pacific/Tongatapu''
);
?>

Answer 6

Siguiendo el ejemplo anterior de user210179, escribí la siguiente función para generar una lista de todas las zonas horarias con sus desplazamientos:

function generate_timezone_list()
{
static $regions = array(
DateTimeZone::AFRICA,
DateTimeZone::AMERICA,
DateTimeZone::ANTARCTICA,
DateTimeZone::ASIA,
DateTimeZone::ATLANTIC,
DateTimeZone::AUSTRALIA,
DateTimeZone::EUROPE,
DateTimeZone::INDIAN,
DateTimeZone::PACIFIC,
);
$timezones = array();
foreach( $regions as $region )
{
$timezones = array_merge( $timezones, DateTimeZone::listIdentifiers( $region ) );
}
$timezone_offsets = array();
foreach( $timezones as $timezone )
{
$tz = new DateTimeZone($timezone);
$timezone_offsets[$timezone] = $tz->getOffset(new DateTime);
}
// sort timezone by offset
asort($timezone_offsets);
$timezone_list = array();
foreach( $timezone_offsets as $timezone => $offset )
{
$offset_prefix = $offset < 0 ? ''-'' : ''+'';
$offset_formatted = gmdate( ''H:i'', abs($offset) );
$pretty_offset = "UTC${offset_prefix}${offset_formatted}";
$timezone_list[$timezone] = "(${pretty_offset}) $timezone";
}
return $timezone_list;
}

Esto generará una matriz que se verá como:

[Pacific/Midway] => (UTC-11:00) Pacific/Midway
[Pacific/Pago_Pago] => (UTC-11:00) Pacific/Pago_Pago
[Pacific/Niue] => (UTC-11:00) Pacific/Niue
[Pacific/Honolulu] => (UTC-10:00) Pacific/Honolulu
[Pacific/Fakaofo] => (UTC-10:00) Pacific/Fakaofo
…

Actualmente está ordenado por compensaciones, pero puede ordenar fácilmente por el nombre de la zona horaria haciendo un ksort() lugar de asort() .

Answer 7

After trying all solutions presented here and not being satisfied, I have found a script which is matching my needs and it is more user friendly. For the record, I will save it as a possible solution. I love the copy/paste solutions :)

Script returns a select with whatever timezone you want preselected.

Source: https://e-tel.eu/2011/07/13/create-a-time-zone-drop-down-list-ddl-in-php/

<?php
/**
* returns a HTML formated TimeZone select
*
* PHP 5 >= 5.2.0
*
* @param $selectedTimeZone string The timezone marked as "selected"
* @return string
*/
function displayTimeZoneSelect($selectedTimeZone = ''America/New_York''){
$countryCodes = getCountryCodes();
$return = null;
foreach ($countryCodes as $country => $countryCode) {
$timezone_identifiers = DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY,$countryCode);
foreach( $timezone_identifiers as $value ){
/* getTimeZoneOffset returns minutes and we need to display hours */
$offset = getTimeZoneOffset($value)/60;
/* for the GMT+1 GMT-1 display */
$offset = ( substr($offset,0,1) == "-" ? " (GMT" : " (GMT+" ) . $offset . ")";
/* America/New_York -> America/New York */
$displayValue = (str_replace(''_'','' '',$value));
/* Find the city */
$ex = explode("/",$displayValue);
$city = ( ($ex[2]) ? $ex[2] : $ex[1] );
/* For the special names */
$displayValue = htmlentities($country." - ".$city.$offset);
/* handle the $selectedTimeZone in the select form */
$selected = ( ($value == $selectedTimeZone) ? '' selected="selected"'' : null );
$return .= ''<option value="'' . $value . ''"'' . $selected . ''>''
. $displayValue
. ''</option>'' . PHP_EOL;
}
}
return $return;
}
/**
* ISO 3166 code list
*
* @return array The country codes in ''COUNTRY'' => ''CODE'' format
* @link http://www.iso.org/iso/iso_3166_code_lists ISO Website
*/
function getCountryCodes(){
$return = array(
"AFGHANISTAN"=>"AF",
"ALAND ISLANDS"=>"AX",
"ALBANIA"=>"AL",
"ALGERIA"=>"DZ",
"AMERICAN SAMOA"=>"AS",
"ANDORRA"=>"AD",
"ANGOLA"=>"AO",
"ANGUILLA"=>"AI",
"ANTARCTICA"=>"AQ",
"ANTIGUA AND BARBUDA"=>"AG",
"ARGENTINA"=>"AR",
"ARMENIA"=>"AM",
"ARUBA"=>"AW",
"AUSTRALIA"=>"AU",
"AUSTRIA"=>"AT",
"AZERBAIJAN"=>"AZ",
"BAHAMAS"=>"BS",
"BAHRAIN"=>"BH",
"BANGLADESH"=>"BD",
"BARBADOS"=>"BB",
"BELARUS"=>"BY",
"BELGIUM"=>"BE",
"BELIZE"=>"BZ",
"BENIN"=>"BJ",
"BERMUDA"=>"BM",
"BHUTAN"=>"BT",
"BOLIVIA, PLURINATIONAL STATE OF"=>"BO",
"BONAIRE, SINT EUSTATIUS AND SABA"=>"BQ",
"BOSNIA AND HERZEGOVINA"=>"BA",
"BOTSWANA"=>"BW",
"BOUVET ISLAND"=>"BV",
"BRAZIL"=>"BR",
"BRITISH INDIAN OCEAN TERRITORY"=>"IO",
"BRUNEI DARUSSALAM"=>"BN",
"BULGARIA"=>"BG",
"BURKINA FASO"=>"BF",
"BURUNDI"=>"BI",
"CAMBODIA"=>"KH",
"CAMEROON"=>"CM",
"CANADA"=>"CA",
"CAPE VERDE"=>"CV",
"CAYMAN ISLANDS"=>"KY",
"CENTRAL AFRICAN REPUBLIC"=>"CF",
"CHAD"=>"TD",
"CHILE"=>"CL",
"CHINA"=>"CN",
"CHRISTMAS ISLAND"=>"CX",
"COCOS (KEELING) ISLANDS"=>"CC",
"COLOMBIA"=>"CO",
"COMOROS"=>"KM",
"CONGO"=>"CG",
"CONGO, THE DEMOCRATIC REPUBLIC OF THE"=>"CD",
"COOK ISLANDS"=>"CK",
"COSTA RICA"=>"CR",
"CÔTE D''IVOIRE"=>"CI",
"CROATIA"=>"HR",
"CUBA"=>"CU",
"CURAÇAO"=>"CW",
"CYPRUS"=>"CY",
"CZECH REPUBLIC"=>"CZ",
"DENMARK"=>"DK",
"DJIBOUTI"=>"DJ",
"DOMINICA"=>"DM",
"DOMINICAN REPUBLIC"=>"DO",
"ECUADOR"=>"EC",
"EGYPT"=>"EG",
"EL SALVADOR"=>"SV",
"EQUATORIAL GUINEA"=>"GQ",
"ERITREA"=>"ER",
"ESTONIA"=>"EE",
"ETHIOPIA"=>"ET",
"FALKLAND ISLANDS (MALVINAS)"=>"FK",
"FAROE ISLANDS"=>"FO",
"FIJI"=>"FJ",
"FINLAND"=>"FI",
"FRANCE"=>"FR",
"FRENCH GUIANA"=>"GF",
"FRENCH POLYNESIA"=>"PF",
"FRENCH SOUTHERN TERRITORIES"=>"TF",
"GABON"=>"GA",
"GAMBIA"=>"GM",
"GEORGIA"=>"GE",
"GERMANY"=>"DE",
"GHANA"=>"GH",
"GIBRALTAR"=>"GI",
"GREECE"=>"GR",
"GREENLAND"=>"GL",
"GRENADA"=>"GD",
"GUADELOUPE"=>"GP",
"GUAM"=>"GU",
"GUATEMALA"=>"GT",
"GUERNSEY"=>"GG",
"GUINEA"=>"GN",
"GUINEA-BISSAU"=>"GW",
"GUYANA"=>"GY",
"HAITI"=>"HT",
"HEARD ISLAND AND MCDONALD ISLANDS"=>"HM",
"HOLY SEE (VATICAN CITY STATE)"=>"VA",
"HONDURAS"=>"HN",
"HONG KONG"=>"HK",
"HUNGARY"=>"HU",
"ICELAND"=>"IS",
"INDIA"=>"IN",
"INDONESIA"=>"ID",
"IRAN, ISLAMIC REPUBLIC OF"=>"IR",
"IRAQ"=>"IQ",
"IRELAND"=>"IE",
"ISLE OF MAN"=>"IM",
"ISRAEL"=>"IL",
"ITALY"=>"IT",
"JAMAICA"=>"JM",
"JAPAN"=>"JP",
"JERSEY"=>"JE",
"JORDAN"=>"JO",
"KAZAKHSTAN"=>"KZ",
"KENYA"=>"KE",
"KIRIBATI"=>"KI",
"KOREA, DEMOCRATIC PEOPLE''S REPUBLIC OF"=>"KP",
"KOREA, REPUBLIC OF"=>"KR",
"KUWAIT"=>"KW",
"KYRGYZSTAN"=>"KG",
"LAO PEOPLE''S DEMOCRATIC REPUBLIC"=>"LA",
"LATVIA"=>"LV",
"LEBANON"=>"LB",
"LESOTHO"=>"LS",
"LIBERIA"=>"LR",
"LIBYAN ARAB JAMAHIRIYA"=>"LY",
"LIECHTENSTEIN"=>"LI",
"LITHUANIA"=>"LT",
"LUXEMBOURG"=>"LU",
"MACAO"=>"MO",
"MACEDONIA, THE FORMER YUGOSLAV REPUBLIC OF"=>"MK",
"MADAGASCAR"=>"MG",
"MALAWI"=>"MW",
"MALAYSIA"=>"MY",
"MALDIVES"=>"MV",
"MALI"=>"ML",
"MALTA"=>"MT",
"MARSHALL ISLANDS"=>"MH",
"MARTINIQUE"=>"MQ",
"MAURITANIA"=>"MR",
"MAURITIUS"=>"MU",
"MAYOTTE"=>"YT",
"MEXICO"=>"MX",
"MICRONESIA, FEDERATED STATES OF"=>"FM",
"MOLDOVA, REPUBLIC OF"=>"MD",
"MONACO"=>"MC",
"MONGOLIA"=>"MN",
"MONTENEGRO"=>"ME",
"MONTSERRAT"=>"MS",
"MOROCCO"=>"MA",
"MOZAMBIQUE"=>"MZ",
"MYANMAR"=>"MM",
"NAMIBIA"=>"NA",
"NAURU"=>"NR",
"NEPAL"=>"NP",
"NETHERLANDS"=>"NL",
"NEW CALEDONIA"=>"NC",
"NEW ZEALAND"=>"NZ",
"NICARAGUA"=>"NI",
"NIGER"=>"NE",
"NIGERIA"=>"NG",
"NIUE"=>"NU",
"NORFOLK ISLAND"=>"NF",
"NORTHERN MARIANA ISLANDS"=>"MP",
"NORWAY"=>"NO",
"OMAN"=>"OM",
"PAKISTAN"=>"PK",
"PALAU"=>"PW",
"PALESTINIAN TERRITORY, OCCUPIED"=>"PS",
"PANAMA"=>"PA",
"PAPUA NEW GUINEA"=>"PG",
"PARAGUAY"=>"PY",
"PERU"=>"PE",
"PHILIPPINES"=>"PH",
"PITCAIRN"=>"PN",
"POLAND"=>"PL",
"PORTUGAL"=>"PT",
"PUERTO RICO"=>"PR",
"QATAR"=>"QA",
"RÉUNION"=>"RE",
"ROMANIA"=>"RO",
"RUSSIAN FEDERATION"=>"RU",
"RWANDA"=>"RW",
"SAINT BARTHÉLEMY"=>"BL",
"SAINT HELENA, ASCENSION AND TRISTAN DA CUNHA"=>"SH",
"SAINT KITTS AND NEVIS"=>"KN",
"SAINT LUCIA"=>"LC",
"SAINT MARTIN (FRENCH PART)"=>"MF",
"SAINT PIERRE AND MIQUELON"=>"PM",
"SAINT VINCENT AND THE GRENADINES"=>"VC",
"SAMOA"=>"WS",
"SAN MARINO"=>"SM",
"SAO TOME AND PRINCIPE"=>"ST",
"SAUDI ARABIA"=>"SA",
"SENEGAL"=>"SN",
"SERBIA"=>"RS",
"SEYCHELLES"=>"SC",
"SIERRA LEONE"=>"SL",
"SINGAPORE"=>"SG",
"SINT MAARTEN (DUTCH PART)"=>"SX",
"SLOVAKIA"=>"SK",
"SLOVENIA"=>"SI",
"SOLOMON ISLANDS"=>"SB",
"SOMALIA"=>"SO",
"SOUTH AFRICA"=>"ZA",
"SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS"=>"GS",
"SPAIN"=>"ES",
"SRI LANKA"=>"LK",
"SUDAN"=>"SD",
"SURINAME"=>"SR",
"SVALBARD AND JAN MAYEN"=>"SJ",
"SWAZILAND"=>"SZ",
"SWEDEN"=>"SE",
"SWITZERLAND"=>"CH",
"SYRIAN ARAB REPUBLIC"=>"SY",
"TAIWAN, PROVINCE OF CHINA"=>"TW",
"TAJIKISTAN"=>"TJ",
"TANZANIA, UNITED REPUBLIC OF"=>"TZ",
"THAILAND"=>"TH",
"TIMOR-LESTE"=>"TL",
"TOGO"=>"TG",
"TOKELAU"=>"TK",
"TONGA"=>"TO",
"TRINIDAD AND TOBAGO"=>"TT",
"TUNISIA"=>"TN",
"TURKEY"=>"TR",
"TURKMENISTAN"=>"TM",
"TURKS AND CAICOS ISLANDS"=>"TC",
"TUVALU"=>"TV",
"UGANDA"=>"UG",
"UKRAINE"=>"UA",
"UNITED ARAB EMIRATES"=>"AE",
"UNITED KINGDOM"=>"GB",
"UNITED STATES"=>"US",
"UNITED STATES MINOR OUTLYING ISLANDS"=>"UM",
"URUGUAY"=>"UY",
"UZBEKISTAN"=>"UZ",
"VANUATU"=>"VU",
"VENEZUELA, BOLIVARIAN REPUBLIC OF"=>"VE",
"VIET NAM"=>"VN",
"VIRGIN ISLANDS, BRITISH"=>"VG",
"VIRGIN ISLANDS, U.S."=>"VI",
"WALLIS AND FUTUNA"=>"WF",
"WESTERN SAHARA"=>"EH",
"YEMEN"=>"YE",
"ZAMBIA"=>"ZM",
"ZIMBABWE"=>"ZW");
return $return;
}
/**
* Calculates the offset from UTC for a given timezone
*
* @return integer
*/
function getTimeZoneOffset($timeZone) {
$dateTimeZoneUTC = new DateTimeZone("UTC");
$dateTimeZoneCurrent = new DateTimeZone($timeZone);
$dateTimeUTC = new DateTime("now",$dateTimeZoneUTC);
$dateTimeCurrent = new DateTime("now",$dateTimeZoneCurrent);
$offset = (($dateTimeZoneCurrent->getOffset($dateTimeUTC))/60);
return $offset;
}
?>
<label for="timeZone">Timezone<br />
<select id="timeZone" name="timeZone">
<?php echo displayTimeZoneSelect("America/Toronto");?>
</select>
</label>

Answer 8

Here''s a class I put together, mixing what I thought was the best of all suggestions here, and with Carbon as a dependency:

namespace App/Support;
use Carbon/Carbon;
use DateTimeZone;
class Timezone
{
protected static $timezones;
public static function all(): array
{
if (static::$timezones) {
return static::$timezones;
}
$offsets = [];
$timezones = [];
foreach (DateTimeZone::listIdentifiers() as $timezone) {
$offsets[] = $offset = Carbon::now()->timezone($timezone)->offset;
$timezones[$timezone] = static::formatTimezoneDisplay($timezone, $offset);
array_multisort($offsets, $timezones);
}
return static::$timezones = $timezones;
}
protected static function formatTimezoneDisplay(string $timezone, string $offset): string
{
return static::formatOffset($offset) . '' ('' . static::formatTimezone($timezone) . '')'';
}
protected static function formatOffset(string $offset): string
{
if (!$offset) {
return ''UTC±00:00'';
}
$hours = intval($offset / 3600);
$minutes = abs(intval($offset % 3600 / 60));
return ''UTC'' . sprintf(''%+03d:%02d'', $hours, $minutes);
}
protected static function formatTimezone(string $timezone): string
{
return str_replace([''/'', ''_'', ''St ''], ['', '', '' '', ''St. ''], $timezone);
}
}

You simply Timezone:all() , and that gets you an array in the format of UTC-5:00 (America, New York) , so you could easily display a select field on your frontend.

Answer 9

Here''s one that creates a multidimensional array sorted by offset and niceified name:

function timezones() {
$timezones = [];
foreach (timezone_identifiers_list() as $timezone) {
$datetime = new /DateTime(''now'', new DateTimeZone($timezone));
$timezones[] = [
''sort'' => str_replace('':'', '''', $datetime->format(''P'')),
''offset'' => $datetime->format(''P''),
''name'' => str_replace(''_'', '' '', implode('', '', explode(''/'', $timezone))),
''timezone'' => $timezone,
];
}
usort($timezones, function($a, $b) {
return $a[''sort''] - $b[''sort''] ?: strcmp($a[''name''], $b[''name'']);
});
return $timezones;
}
foreach (timezones() as $timezone) {
echo ''(UTC ''.$timezone[''offset''].'') ''.$timezone[''name''].''<br>'';
}

Echos:

(UTC -11:00) Pacific, Midway
(UTC -11:00) Pacific, Niue
(UTC -11:00) Pacific, Pago Pago
(UTC -10:00) Pacific, Honolulu
(UTC -10:00) Pacific, Johnston
(UTC -10:00) Pacific, Rarotonga
(UTC -10:00) Pacific, Tahiti
(UTC -09:30) Pacific, Marquesas
(UTC -09:00) America, Adak
(UTC -09:00) Pacific, Gambier
(UTC -08:00) America, Anchorage
(UTC -08:00) America, Juneau
...

Answer 10

I created a PHP class for this with a corresponding jQuery plugin. I''ve open-sourced it at https://github.com/peterjtracey/timezoneWidget - the PHP code is inspired by another answer, but I think much more elegant. The jQuery plugin gives a great interface for selecting a timezone.

Answer 11

I know this has an answer already but I saw an opportunity to improve upon one of the answers here. Toland H posted some very good code that does exactly what the question was asking for. Below is a shortened and expand version of Toland H''s code:

• The function places everything in option tags for you. Just echo out whats return between your select tags.
• Major Improvement: The list is sorted first by continent and organized in option groups based on continents. Makes it very user friendly for visitors picking their timezone.

function generate_timezone_list() {
static $allRegions = array(
DateTimeZone::AFRICA,
DateTimeZone::AMERICA,
DateTimeZone::ANTARCTICA,
DateTimeZone::ASIA,
DateTimeZone::ATLANTIC,
DateTimeZone::AUSTRALIA,
DateTimeZone::EUROPE,
DateTimeZone::INDIAN,
DateTimeZone::PACIFIC
);
// Makes it easier to create option groups next
$list = array (''AFRICA'',''AMERICA'',''ANTARCTICA'',''ASIA'',''ATLANTIC'',''AUSTRALIA'',''EUROPE'',''INDIAN'',''PACIFIC'');
// Make array holding the regions (continents), they are arrays w/ all their cities
$region = array();
foreach ($allRegions as $area){
array_push ($region,DateTimeZone::listIdentifiers( $area ));
}
$count = count ($region); $i = 0; $holder = '''';
// Go through each region one by one, sorting and formatting it''s cities
while ($i < $count){
$chunck = $region[$i];
// Create the region (continents) option group
$holder .= ''<optgroup label="---------- ''.$list[$i].'' ----------">'';
$timezone_offsets = array();
foreach( $chunck as $timezone ){
$tz = new DateTimeZone($timezone);
$timezone_offsets[$timezone] = $tz->getOffset(new DateTime);
}
asort ($timezone_offsets);
$timezone_list = array();
foreach ($timezone_offsets as $timezone => $offset){
$offset_prefix = $offset < 0 ? ''-'' : ''+'';
$offset_formatted = gmdate( ''H:i'', abs($offset) );
$pretty_offset = "UTC ${offset_prefix}${offset_formatted}";
$timezone_list[$timezone] = "(${pretty_offset}) $timezone";
}
// All the formatting is done, finish and move on to next region
foreach ($timezone_list as $key => $val){
$holder .= ''<option value="''.$key.''">''.$val.''</option>'';
}
$holder .= ''</optgroup>'';
++$i;
}
return $holder;
}
echo "<select>".generate_timezone_list()."</select>";

Then all you need to do is echo out what is returned between your html select tags. You''ll get a select list something like this:

----- AFRICA -----
(UTC +00:00) Africa/ city name
(UTC +01:00) Africa/ city name
(UTC +02:00) Africa/ city name
(UTC +02:00) Africa/ city name
----- AMERICA -----
(UTC -09:00) America/ city name
(UTC -07:00) America/ city name
(UTC +02:00) America/ city name
(UTC +05:00) America/ city name

Y así...

Answer 12

I wanted to have something simpler for my users, the way Google does it..

$timezones = [
"AF" => [
"name" => "Afghanistan"
],
"AL" => [
"name" => "Albania"
],
"DZ" => [
"name" => "Algeria"
],
"AS" => [
"name" => "American Samoa"
],
"AD" => [
"name" => "Andorra"
],
"AQ" => [
"name" => "Antarctica"
],
"AG" => [
"name" => "Antigua & Barbuda"
],
"AR" => [
"name" => "Argentina"
],
"AM" => [
"name" => "Armenia"
],
"AU" => [
"name" => "Australia"
],
"AT" => [
"name" => "Austria"
],
"AZ" => [
"name" => "Azerbaijan"
],
"BS" => [
"name" => "Bahamas"
],
"BD" => [
"name" => "Bangladesh"
],
"BB" => [
"name" => "Barbados"
],
"BY" => [
"name" => "Belarus"
],
"BE" => [
"name" => "Belgium"
],
"BZ" => [
"name" => "Belize"
],
"BM" => [
"name" => "Bermuda"
],
"BT" => [
"name" => "Bhutan"
],
"BO" => [
"name" => "Bolivia"
],
"BA" => [
"name" => "Bosnia & Herzegovina"
],
"BR" => [
"name" => "Brazil"
],
"IO" => [
"name" => "British Indian Ocean Territory"
],
"BN" => [
"name" => "Brunei"
],
"BG" => [
"name" => "Bulgaria"
],
"CA" => [
"name" => "Canada"
],
"CV" => [
"name" => "Cape Verde"
],
"KY" => [
"name" => "Cayman Islands"
],
"TD" => [
"name" => "Chad"
],
"CL" => [
"name" => "Chile"
],
"CN" => [
"name" => "China"
],
"CX" => [
"name" => "Christmas Island"
],
"CC" => [
"name" => "Cocos (Keeling) Islands"
],
"CO" => [
"name" => "Colombia"
],
"CK" => [
"name" => "Cook Islands"
],
"CR" => [
"name" => "Costa Rica"
],
"CI" => [
"name" => "Côte d’Ivoire"
],
"HR" => [
"name" => "Croatia"
],
"CU" => [
"name" => "Cuba"
],
"CW" => [
"name" => "Curaçao"
],
"CY" => [
"name" => "Cyprus"
],
"CZ" => [
"name" => "Czech Republic"
],
"DK" => [
"name" => "Denmark"
],
"DO" => [
"name" => "Dominican Republic"
],
"EC" => [
"name" => "Ecuador"
],
"EG" => [
"name" => "Egypt"
],
"SV" => [
"name" => "El Salvador"
],
"EE" => [
"name" => "Estonia"
],
"FK" => [
"name" => "Falkland Islands (Islas Malvinas)"
],
"FO" => [
"name" => "Faroe Islands"
],
"FJ" => [
"name" => "Fiji"
],
"FI" => [
"name" => "Finland"
],
"FR" => [
"name" => "France"
],
"GF" => [
"name" => "French Guiana"
],
"PF" => [
"name" => "French Polynesia"
],
"TF" => [
"name" => "French Southern Territories"
],
"GE" => [
"name" => "Georgia"
],
"DE" => [
"name" => "Germany"
],
"GH" => [
"name" => "Ghana"
],
"GI" => [
"name" => "Gibraltar"
],
"GR" => [
"name" => "Greece"
],
"GL" => [
"name" => "Greenland"
],
"GU" => [
"name" => "Guam"
],
"GT" => [
"name" => "Guatemala"
],
"GW" => [
"name" => "Guinea-Bissau"
],
"GY" => [
"name" => "Guyana"
],
"HT" => [
"name" => "Haiti"
],
"HN" => [
"name" => "Honduras"
],
"HK" => [
"name" => "Hong Kong"
],
"HU" => [
"name" => "Hungary"
],
"IS" => [
"name" => "Iceland"
],
"IN" => [
"name" => "India"
],
"ID" => [
"name" => "Indonesia"
],
"IR" => [
"name" => "Iran"
],
"IQ" => [
"name" => "Iraq"
],
"IE" => [
"name" => "Ireland"
],
"IL" => [
"name" => "Israel"
],
"IT" => [
"name" => "Italy"
],
"JM" => [
"name" => "Jamaica"
],
"JP" => [
"name" => "Japan"
],
"JO" => [
"name" => "Jordan"
],
"KZ" => [
"name" => "Kazakhstan"
],
"KE" => [
"name" => "Kenya"
],
"KI" => [
"name" => "Kiribati"
],
"KG" => [
"name" => "Kyrgyzstan"
],
"LV" => [
"name" => "Latvia"
],
"LB" => [
"name" => "Lebanon"
],
"LR" => [
"name" => "Liberia"
],
"LY" => [
"name" => "Libya"
],
"LT" => [
"name" => "Lithuania"
],
"LU" => [
"name" => "Luxembourg"
],
"MO" => [
"name" => "Macau"
],
"MK" => [
"name" => "Macedonia (FYROM)"
],
"MY" => [
"name" => "Malaysia"
],
"MV" => [
"name" => "Maldives"
],
"MT" => [
"name" => "Malta"
],
"MH" => [
"name" => "Marshall Islands"
],
"MQ" => [
"name" => "Martinique"
],
"MU" => [
"name" => "Mauritius"
],
"MX" => [
"name" => "Mexico"
],
"FM" => [
"name" => "Micronesia"
],
"MD" => [
"name" => "Moldova"
],
"MC" => [
"name" => "Monaco"
],
"MN" => [
"name" => "Mongolia"
],
"MA" => [
"name" => "Morocco"
],
"MZ" => [
"name" => "Mozambique"
],
"MM" => [
"name" => "Myanmar (Burma)"
],
"NA" => [
"name" => "Namibia"
],
"NR" => [
"name" => "Nauru"
],
"NP" => [
"name" => "Nepal"
],
"NL" => [
"name" => "Netherlands"
],
"NC" => [
"name" => "New Caledonia"
],
"NZ" => [
"name" => "New Zealand"
],
"NI" => [
"name" => "Nicaragua"
],
"NG" => [
"name" => "Nigeria"
],
"NU" => [
"name" => "Niue"
],
"NF" => [
"name" => "Norfolk Island"
],
"KP" => [
"name" => "North Korea"
],
"MP" => [
"name" => "Northern Mariana Islands"
],
"NO" => [
"name" => "Norway"
],
"PK" => [
"name" => "Pakistan"
],
"PW" => [
"name" => "Palau"
],
"PS" => [
"name" => "Palestine"
],
"PA" => [
"name" => "Panama"
],
"PG" => [
"name" => "Papua New Guinea"
],
"PY" => [
"name" => "Paraguay"
],
"PE" => [
"name" => "Peru"
],
"PH" => [
"name" => "Philippines"
],
"PN" => [
"name" => "Pitcairn Islands"
],
"PL" => [
"name" => "Poland"
],
"PT" => [
"name" => "Portugal"
],
"PR" => [
"name" => "Puerto Rico"
],
"QA" => [
"name" => "Qatar"
],
"RE" => [
"name" => "Réunion"
],
"RO" => [
"name" => "Romania"
],
"RU" => [
"name" => "Russia"
],
"WS" => [
"name" => "Samoa"
],
"SM" => [
"name" => "San Marino"
],
"SA" => [
"name" => "Saudi Arabia"
],
"RS" => [
"name" => "Serbia"
],
"SC" => [
"name" => "Seychelles"
],
"SG" => [
"name" => "Singapore"
],
"SK" => [
"name" => "Slovakia"
],
"SI" => [
"name" => "Slovenia"
],
"SB" => [
"name" => "Solomon Islands"
],
"ZA" => [
"name" => "South Africa"
],
"GS" => [
"name" => "South Georgia & South Sandwich Islands"
],
"KR" => [
"name" => "South Korea"
],
"ES" => [
"name" => "Spain"
],
"LK" => [
"name" => "Sri Lanka"
],
"PM" => [
"name" => "St. Pierre & Miquelon"
],
"SD" => [
"name" => "Sudan"
],
"SR" => [
"name" => "Suriname"
],
"SJ" => [
"name" => "Svalbard & Jan Mayen"
],
"SE" => [
"name" => "Sweden"
],
"CH" => [
"name" => "Switzerland"
],
"SY" => [
"name" => "Syria"
],
"TW" => [
"name" => "Taiwan"
],
"TJ" => [
"name" => "Tajikistan"
],
"TH" => [
"name" => "Thailand"
],
"TL" => [
"name" => "Timor-Leste"
],
"TK" => [
"name" => "Tokelau"
],
"TO" => [
"name" => "Tonga"
],
"TT" => [
"name" => "Trinidad & Tobago"
],
"TN" => [
"name" => "Tunisia"
],
"TR" => [
"name" => "Turkey"
],
"TM" => [
"name" => "Turkmenistan"
],
"TC" => [
"name" => "Turks & Caicos Islands"
],
"TV" => [
"name" => "Tuvalu"
],
"UM" => [
"name" => "U.S. Outlying Islands"
],
"UA" => [
"name" => "Ukraine"
],
"AE" => [
"name" => "United Arab Emirates"
],
"GB" => [
"name" => "United Kingdom"
],
"US" => [
"name" => "United States"
],
"UY" => [
"name" => "Uruguay"
],
"UZ" => [
"name" => "Uzbekistan"
],
"VU" => [
"name" => "Vanuatu"
],
"VA" => [
"name" => "Vatican City"
],
"VE" => [
"name" => "Venezuela"
],
"VN" => [
"name" => "Vietnam"
],
"WF" => [
"name" => "Wallis & Futuna"
],
"EH" => [
"name" => "Western Sahara"
],
];
// taken from Toland Hon''s Answer
function prettyOffset($offset) {
$offset_prefix = $offset < 0 ? ''-'' : ''+'';
$offset_formatted = gmdate( ''H:i'', abs($offset) );
$pretty_offset = "UTC${offset_prefix}${offset_formatted}";
return $pretty_offset;
}
foreach ($timezones as $k => $v) {
$tz = DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, $k);
foreach ($tz as $value) {
$t = new DateTimeZone($value);
$offset = (new DateTime("now", $t))->getOffset();
$timezones[$k][''timezones''][$value] = prettyOffset($offset);
}
}

This gives me an array grouped by countries:

["US"]=>
array(2) {
["name"]=>
string(13) "United States"
["timezones"]=>
array(29) {
["America/Adak"]=>
string(9) "UTC-10:00"
["America/Anchorage"]=>
string(9) "UTC-09:00"
["America/Boise"]=>
string(9) "UTC-07:00"
["America/Chicago"]=>
string(9) "UTC-06:00"
["America/Denver"]=>
string(9) "UTC-07:00"
["America/Detroit"]=>
string(9) "UTC-05:00"
["America/Indiana/Indianapolis"]=>
string(9) "UTC-05:00"
["America/Indiana/Knox"]=>
string(9) "UTC-06:00"
["America/Indiana/Marengo"]=>
string(9) "UTC-05:00"
["America/Indiana/Petersburg"]=>
string(9) "UTC-05:00"
["America/Indiana/Tell_City"]=>
string(9) "UTC-06:00"
["America/Indiana/Vevay"]=>
string(9) "UTC-05:00"
["America/Indiana/Vincennes"]=>
string(9) "UTC-05:00"
["America/Indiana/Winamac"]=>
string(9) "UTC-05:00"
["America/Juneau"]=>
string(9) "UTC-09:00"
["America/Kentucky/Louisville"]=>
string(9) "UTC-05:00"
["America/Kentucky/Monticello"]=>
string(9) "UTC-05:00"
["America/Los_Angeles"]=>
string(9) "UTC-08:00"
["America/Menominee"]=>
string(9) "UTC-06:00"
["America/Metlakatla"]=>
string(9) "UTC-08:00"
["America/New_York"]=>
string(9) "UTC-05:00"
["America/Nome"]=>
string(9) "UTC-09:00"
["America/North_Dakota/Beulah"]=>
string(9) "UTC-06:00"
["America/North_Dakota/Center"]=>
string(9) "UTC-06:00"
["America/North_Dakota/New_Salem"]=>
string(9) "UTC-06:00"
["America/Phoenix"]=>
string(9) "UTC-07:00"
["America/Sitka"]=>
string(9) "UTC-09:00"
["America/Yakutat"]=>
string(9) "UTC-09:00"
["Pacific/Honolulu"]=>
string(9) "UTC-10:00"
}
}

Which means now I can do something like below (of course with some javaScript trickery):

Answer 13

In some projects it really doesn''t make sense to have the detailed timezones of Africa, Europe or Pacific. So here is a short version

$timezoneTable = array(
"-12" => "(GMT -12:00) Eniwetok, Kwajalein",
"-11" => "(GMT -11:00) Midway Island, Samoa",
"-10" => "(GMT -10:00) Hawaii",
"-9" => "(GMT -9:00) Alaska",
"-8" => "(GMT -8:00) Pacific Time (US & Canada)",
"-7" => "(GMT -7:00) Mountain Time (US & Canada)",
"-6" => "(GMT -6:00) Central Time (US & Canada), Mexico City",
"-5" => "(GMT -5:00) Eastern Time (US & Canada), Bogota, Lima",
"-4" => "(GMT -4:00) Atlantic Time (Canada), Caracas, La Paz",
"-3.5" => "(GMT -3:30) Newfoundland",
"-3" => "(GMT -3:00) Brazil, Buenos Aires, Georgetown",
"-2" => "(GMT -2:00) Mid-Atlantic",
"-1" => "(GMT -1:00) Azores, Cape Verde Islands",
"0" => "(GMT) Western Europe Time, London, Lisbon, Casablanca",
"1" => "(GMT +1:00) Brussels, Copenhagen, Madrid, Paris",
"2" => "(GMT +2:00) Kaliningrad, South Africa",
"3" => "(GMT +3:00) Baghdad, Riyadh, Moscow, St. Petersburg",
"3.5" => "(GMT +3:30) Tehran",
"4" => "(GMT +4:00) Abu Dhabi, Muscat, Baku, Tbilisi",
"4.5" => "(GMT +4:30) Kabul",
"5" => "(GMT +5:00) Ekaterinburg, Islamabad, Karachi, Tashkent",
"5.5" => "(GMT +5:30) Bombay, Calcutta, Madras, New Delhi",
"6" => "(GMT +6:00) Almaty, Dhaka, Colombo",
"7" => "(GMT +7:00) Bangkok, Hanoi, Jakarta",
"8" => "(GMT +8:00) Beijing, Perth, Singapore, Hong Kong",
"9" => "(GMT +9:00) Tokyo, Seoul, Osaka, Sapporo, Yakutsk",
"9.5" => "(GMT +9:30) Adelaide, Darwin",
"10" => "(GMT +10:00) Eastern Australia, Guam, Vladivostok",
"11" => "(GMT +11:00) Magadan, Solomon Islands, New Caledonia",
"12" => "(GMT +12:00) Auckland, Wellington, Fiji, Kamchatka"
);
echo "<select>";
foreach ($timezoneTable as $k => $v){
$sel = ($k==-5)?" selected":"";
echo "<option value=''".$k."''".$sel.">".$v."</option>";
}
echo "</select>"

this will generate a select as below:

Answer 14

None of them. Instead prepare an array in PHP with those timezones. Me gusta

$arr[0] = "(GMT+02:00) Harare, Pretoria";
$arr[1] = "(GMT+03:00) Jerusalem";

o

$arr[0] = array("America/Campo_Grande", "(GMT+02:00) Harare, Pretoria");
$arr[1] = array("America/Israel", "(GMT+03:00) Jerusalem");

y así. Then generate form based on this array:

foreach ($arr as $k => $v)
$str .= "<option value=$k>$v[1]</option>";

And then you may easily switch with different formats with just code modification in above line. Also validation will be much easier and don''t require regular expressions. Just compare value sent by POST or GET with an array. Now it''s easy to set $arr[$value_sent_by_form][0] holds PHP compatible value while $arr[$value_sent_by_form][1] user friendly value.

Answer 15

See this example also

<?php
function get_timezones()
{
$o = array();
$t_zones = timezone_identifiers_list();
foreach($t_zones as $a)
{
$t = '''';
try
{
//this throws exception for ''US/Pacific-New''
$zone = new DateTimeZone($a);
$seconds = $zone->getOffset( new DateTime("now" , $zone) );
$hours = sprintf( "%+02d" , intval($seconds/3600));
$minutes = sprintf( "%02d" , ($seconds%3600)/60 );
$t = $a ." [ $hours:$minutes ]" ;
$o[$a] = $t;
}
//exceptions must be catched, else a blank page
catch(Exception $e)
{
//die("Exception : " . $e->getMessage() . ''<br />'');
//what to do in catch ? , nothing just relax
}
}
ksort($o);
return $o;
}
$o = get_timezones();
?>
<html>
<body>
<select name="time_zone">
<?php
foreach($o as $tz => $label)
{
echo "<option value="$tz">$label</option>";
}
?>
</select>
</body>
</html>

Answer 16

This PHP function do the Job for you an give back an array:

function time_zonelist(){
$return = array();
$timezone_identifiers_list = timezone_identifiers_list();
foreach($timezone_identifiers_list as $timezone_identifier){
$date_time_zone = new DateTimeZone($timezone_identifier);
$date_time = new DateTime(''now'', $date_time_zone);
$hours = floor($date_time_zone->getOffset($date_time) / 3600);
$mins = floor(($date_time_zone->getOffset($date_time) - ($hours*3600)) / 60);
$hours = ''GMT'' . ($hours < 0 ? $hours : ''+''.$hours);
$mins = ($mins > 0 ? $mins : ''0''.$mins);
$text = str_replace("_"," ",$timezone_identifier);
$return[$timezone_identifier] = $text.'' (''.$hours.'':''.$mins.'')'';
}
return $return;
}

This PHP function give back an array of all existing Timezones including Offset:

Use it eg like this:

print_r(time_zonelist());

Answer 17

Using listAbbreviations() makes no sense as for every area it returns all the different offsets that were historically used there, not just current ones. The right base source of the list is definitely listIdentifiers().

I would generate the list just once and save it to avoid generating it for every request. I could refresh it once a month.

Also, I could put all the timezones info into a separate js-script and generate the select list itself on the client side. The js-script could be cached as well, timezones don''t change often.

Also, using javascript on the client side, you can know the current local time, and hence you can find the zones that have the same time now (minutes may differ, so comparison should be approximate), and display them on the top of the list, so the user does not have to scroll through all the 400 items. You can also display adjacent zones (+/-1 hour) following.

Answer 18

the first option would allow you to take the value from $_POST[''whateveryoucalltheselect''] and add it to UTC. or even store that value and then always call UTC + userTZsetting whenever you need it later. seems easiest to me. the last option would be much more valuable if timezones changed frequently.

Answer 19

public static function tzList()
{
$tzMap = array();
$zones = /DateTimeZone::listIdentifiers();
foreach ($zones as $zone) {
$tz = new /DateTimeZone($zone);
$now = new /DateTime("utc", $tz);
$diffInSeconds = $tz->getOffset($now);
$hours = floor($diffInSeconds / 3600);
$minutes = floor(($diffInSeconds % 3600) / 60);
$tzMap[$zone] = sprintf("%+d", $hours) . ":" . sprintf("%02d", $minutes);
}
return $tzMap;
}

Tada! It''s this simple. Gives you an array with the key as the PHP timezone and the value as a string in the format +-Hours:Minutes