PHP Timezone List

Question

I am looking for a way to generate a list of timezones for display in a <select> Generating a drop down list of timezones with PHP

    $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');  } 

When I checked my country, the offset was wrong, I am in Asia/Singapore, it should be UTC/GMT +8 http://www.timeanddate.com/worldclock/city.html?n=236 but according to the generated list its +9. Is there some kind of logic error? The time was correct tho

Is there a better way to generate this list? from the same question in the link above,

static $regions = array(     'Africa' => DateTimeZone::AFRICA,     'America' => DateTimeZone::AMERICA,     'Antarctica' => DateTimeZone::ANTARCTICA,     'Aisa' => DateTimeZone::ASIA,     'Atlantic' => DateTimeZone::ATLANTIC,     'Europe' => DateTimeZone::EUROPE,     'Indian' => DateTimeZone::INDIAN,     'Pacific' => DateTimeZone::PACIFIC ); foreach ($regions as $name => $mask) {     $tzlist[] = DateTimeZone::listIdentifiers($mask); } 

This just gets the identifiers I want a friendly display name eg. UTC+8 Asia/Singapore or something similar. How can I get that?

Answer 1

Take my array of time zones, which I made specially for select element. It is associated array where key is PHP time zone and value is human representation. This is it:

$timezones = array(     'Pacific/Midway'       => "(GMT-11:00) Midway Island",     'US/Samoa'             => "(GMT-11:00) Samoa",     'US/Hawaii'            => "(GMT-10:00) Hawaii",     'US/Alaska'            => "(GMT-09:00) Alaska",     'US/Pacific'           => "(GMT-08:00) Pacific Time (US & Canada)",     'America/Tijuana'      => "(GMT-08:00) Tijuana",     'US/Arizona'           => "(GMT-07:00) Arizona",     'US/Mountain'          => "(GMT-07:00) Mountain Time (US & Canada)",     'America/Chihuahua'    => "(GMT-07:00) Chihuahua",     'America/Mazatlan'     => "(GMT-07:00) Mazatlan",     'America/Mexico_City'  => "(GMT-06:00) Mexico City",     'America/Monterrey'    => "(GMT-06:00) Monterrey",     'Canada/Saskatchewan'  => "(GMT-06:00) Saskatchewan",     'US/Central'           => "(GMT-06:00) Central Time (US & Canada)",     'US/Eastern'           => "(GMT-05:00) Eastern Time (US & Canada)",     'US/East-Indiana'      => "(GMT-05:00) Indiana (East)",     'America/Bogota'       => "(GMT-05:00) Bogota",     'America/Lima'         => "(GMT-05:00) Lima",     'America/Caracas'      => "(GMT-04:30) Caracas",     'Canada/Atlantic'      => "(GMT-04:00) Atlantic Time (Canada)",     'America/La_Paz'       => "(GMT-04:00) La Paz",     'America/Santiago'     => "(GMT-04:00) Santiago",     'Canada/Newfoundland'  => "(GMT-03:30) Newfoundland",     'America/Buenos_Aires' => "(GMT-03:00) Buenos Aires",     'Greenland'            => "(GMT-03:00) Greenland",     'Atlantic/Stanley'     => "(GMT-02:00) Stanley",     'Atlantic/Azores'      => "(GMT-01:00) Azores",     'Atlantic/Cape_Verde'  => "(GMT-01:00) Cape Verde Is.",     'Africa/Casablanca'    => "(GMT) Casablanca",     'Europe/Dublin'        => "(GMT) Dublin",     'Europe/Lisbon'        => "(GMT) Lisbon",     'Europe/London'        => "(GMT) London",     'Africa/Monrovia'      => "(GMT) Monrovia",     'Europe/Amsterdam'     => "(GMT+01:00) Amsterdam",     'Europe/Belgrade'      => "(GMT+01:00) Belgrade",     'Europe/Berlin'        => "(GMT+01:00) Berlin",     'Europe/Bratislava'    => "(GMT+01:00) Bratislava",     'Europe/Brussels'      => "(GMT+01:00) Brussels",     'Europe/Budapest'      => "(GMT+01:00) Budapest",     'Europe/Copenhagen'    => "(GMT+01:00) Copenhagen",     'Europe/Ljubljana'     => "(GMT+01:00) Ljubljana",     'Europe/Madrid'        => "(GMT+01:00) Madrid",     'Europe/Paris'         => "(GMT+01:00) Paris",     'Europe/Prague'        => "(GMT+01:00) Prague",     'Europe/Rome'          => "(GMT+01:00) Rome",     'Europe/Sarajevo'      => "(GMT+01:00) Sarajevo",     'Europe/Skopje'        => "(GMT+01:00) Skopje",     'Europe/Stockholm'     => "(GMT+01:00) Stockholm",     'Europe/Vienna'        => "(GMT+01:00) Vienna",     'Europe/Warsaw'        => "(GMT+01:00) Warsaw",     'Europe/Zagreb'        => "(GMT+01:00) Zagreb",     'Europe/Athens'        => "(GMT+02:00) Athens",     'Europe/Bucharest'     => "(GMT+02:00) Bucharest",     'Africa/Cairo'         => "(GMT+02:00) Cairo",     'Africa/Harare'        => "(GMT+02:00) Harare",     'Europe/Helsinki'      => "(GMT+02:00) Helsinki",     'Europe/Istanbul'      => "(GMT+02:00) Istanbul",     'Asia/Jerusalem'       => "(GMT+02:00) Jerusalem",     'Europe/Kiev'          => "(GMT+02:00) Kyiv",     'Europe/Minsk'         => "(GMT+02:00) Minsk",     'Europe/Riga'          => "(GMT+02:00) Riga",     'Europe/Sofia'         => "(GMT+02:00) Sofia",     'Europe/Tallinn'       => "(GMT+02:00) Tallinn",     'Europe/Vilnius'       => "(GMT+02:00) Vilnius",     'Asia/Baghdad'         => "(GMT+03:00) Baghdad",     'Asia/Kuwait'          => "(GMT+03:00) Kuwait",     'Africa/Nairobi'       => "(GMT+03:00) Nairobi",     'Asia/Riyadh'          => "(GMT+03:00) Riyadh",     'Europe/Moscow'        => "(GMT+03:00) Moscow",     'Asia/Tehran'          => "(GMT+03:30) Tehran",     'Asia/Baku'            => "(GMT+04:00) Baku",     'Europe/Volgograd'     => "(GMT+04:00) Volgograd",     'Asia/Muscat'          => "(GMT+04:00) Muscat",     'Asia/Tbilisi'         => "(GMT+04:00) Tbilisi",     'Asia/Yerevan'         => "(GMT+04:00) Yerevan",     'Asia/Kabul'           => "(GMT+04:30) Kabul",     'Asia/Karachi'         => "(GMT+05:00) Karachi",     'Asia/Tashkent'        => "(GMT+05:00) Tashkent",     'Asia/Kolkata'         => "(GMT+05:30) Kolkata",     'Asia/Kathmandu'       => "(GMT+05:45) Kathmandu",     'Asia/Yekaterinburg'   => "(GMT+06:00) Ekaterinburg",     'Asia/Almaty'          => "(GMT+06:00) Almaty",     'Asia/Dhaka'           => "(GMT+06:00) Dhaka",     'Asia/Novosibirsk'     => "(GMT+07:00) Novosibirsk",     'Asia/Bangkok'         => "(GMT+07:00) Bangkok",     'Asia/Jakarta'         => "(GMT+07:00) Jakarta",     'Asia/Krasnoyarsk'     => "(GMT+08:00) Krasnoyarsk",     'Asia/Chongqing'       => "(GMT+08:00) Chongqing",     'Asia/Hong_Kong'       => "(GMT+08:00) Hong Kong",     'Asia/Kuala_Lumpur'    => "(GMT+08:00) Kuala Lumpur",     'Australia/Perth'      => "(GMT+08:00) Perth",     'Asia/Singapore'       => "(GMT+08:00) Singapore",     'Asia/Taipei'          => "(GMT+08:00) Taipei",     'Asia/Ulaanbaatar'     => "(GMT+08:00) Ulaan Bataar",     'Asia/Urumqi'          => "(GMT+08:00) Urumqi",     'Asia/Irkutsk'         => "(GMT+09:00) Irkutsk",     'Asia/Seoul'           => "(GMT+09:00) Seoul",     'Asia/Tokyo'           => "(GMT+09:00) Tokyo",     'Australia/Adelaide'   => "(GMT+09:30) Adelaide",     'Australia/Darwin'     => "(GMT+09:30) Darwin",     'Asia/Yakutsk'         => "(GMT+10:00) Yakutsk",     'Australia/Brisbane'   => "(GMT+10:00) Brisbane",     'Australia/Canberra'   => "(GMT+10:00) Canberra",     'Pacific/Guam'         => "(GMT+10:00) Guam",     'Australia/Hobart'     => "(GMT+10:00) Hobart",     'Australia/Melbourne'  => "(GMT+10:00) Melbourne",     'Pacific/Port_Moresby' => "(GMT+10:00) Port Moresby",     'Australia/Sydney'     => "(GMT+10:00) Sydney",     'Asia/Vladivostok'     => "(GMT+11:00) Vladivostok",     'Asia/Magadan'         => "(GMT+12:00) Magadan",     'Pacific/Auckland'     => "(GMT+12:00) Auckland",     'Pacific/Fiji'         => "(GMT+12:00) Fiji", );