Создание выпадающего списка часовых поясов с помощью PHP

Я бы сделал это в PHP, за исключением того, что несколько раз избегал делать preg_match 100 и делал это для создания вашего списка.

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

Кроме того, я бы использовал имена PHP для «timezones» и забыл о смещениях GMT, которые будут меняться в зависимости от DST. Код, подобный этому в phpbb, является только тем способом b / c, который все еще поддерживает PHP4 и не может полагаться на объекты DateTime или DateTimeZone.

Следуя приведенному выше примеру пользователя210179, я написал следующую функцию, чтобы сгенерировать мне список всех часовых поясов с их смещениями:

 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; } 

Это создаст массив, похожий на:

 [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 … 

В настоящее время он сортируется по смещениям, но вы можете легко отсортировать имя часового пояса, выполнив ksort() вместо asort() .

Несмотря на количество существующих ответов, я сделал еще одно решение этой проблемы. Про моей моей реализации:

• Список часовых поясов генерируется динамически и, таким образом, автоматически обновляется, когда временные интервалы могут меняться (в PHP).
• Названия часового пояса отягощены. Например, «Америка / St_Barthelemy» становится «America, St. Barthelemy».
• Часовой пояс сортируется по смещению и имени. Ответ Толанда сортируется только по смещению, что приводит к несортированным группам часовых поясов в пределах одного и того же смещения.
• Информация о DateTimeZone::listAbbreviations не извлекается из DateTimeZone::listAbbreviations , так как этот метод также возвращает информацию о хронологическом часовом поясе . Ответ Favio использует этот метод, что приводит к неправильным (историческим) смещениям
• Список часовых поясов генерируется только при первом запросе (и «кэшируется» с использованием статической переменной).

Вот полный код:

 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; } 

И вот пример выхода

 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 ... ) 

Я бы сделал это со следующим кодом, который похож на принятый ответ (я знаю, что код может быть реорганизован :)):

  $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'); } 

Он производит что-то вроде:

 <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> 

Надеюсь, что это поможет немного и / или вдохновит вас прийти с чем-то лучшим.

Вы можете создать очень простой выпадающий список из этого массива (задача заключалась в том, чтобы собрать все вместе и протестировать его). Мы уже используем этот список в некоторых наших приложениях.

Очень важно хранить идентификаторы часовых поясов в вашей базе данных, а не только смещение часового пояса, например «GMT + 2», из-за летнего времени.

ОБНОВИТЬ

Я обновил / скорректировал список часовых поясов (также checkout: 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' ); ?> 

Редактирование ответа Тамаса на удаление всех «других» записей, которые, по словам сайта php.net, больше не должны использоваться.

Может быть, это не имеет значения, но только после лучших практик. См. Уведомление внизу: http://fr2.php.net/manual/en/timezones.others.php

Кроме того, хотя этот список имеет Azores как GMT-1, на самом деле я думаю, что это то же (по крайней мере иногда), что и GMT, но не уверен.

Редактирование, чтобы предложить это в sql, чтобы вы могли создать раскрывающийся список в форме, и вместо этого ответ пользователя будет привязан к индексу.

Редактирование снова для удаления ведущего пространства

 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 */; 

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.

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 

И так далее…

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" => "US 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):

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()); 

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

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

this will generate a select as below:

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.

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

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

или

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

и так далее. 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.

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> 

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, US"=>"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> 

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 ... 

 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; } 

Тада! 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