Generating a drop down list of timezones with PHP
I would do it in PHP, except I would avoid doing preg_match 100 some times and do this to generate your list.
$tzlist = DateTimeZone::listIdentifiers(DateTimeZone::ALL);
Also, I would use PHP's names for the 'timezones' and forget about GMT offsets, which will change based on DST.
Code like that in phpbb is only that way b/c they are still supporting PHP4 and can't rely on the DateTime or DateTimeZone objects being there.
Best way to populate a SELECT box with TimeZones
function formatOffset($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 $sign . str_pad($hour, 2, '0', STR_PAD_LEFT) .':'. str_pad($minutes,2, '0');
}
$utc = new DateTimeZone('UTC');
$dt = new DateTime('now', $utc);
echo '<select name="userTimeZone">';
foreach(DateTimeZone::listIdentifiers() as $tz) {
$current_tz = new DateTimeZone($tz);
$offset = $current_tz->getOffset($dt);
$transition = $current_tz->getTransitions($dt->getTimestamp(), $dt->getTimestamp());
$abbr = $transition[0]['abbr'];
echo '<option value="' .$tz. '">' .$tz. ' [' .$abbr. ' '. formatOffset($offset). ']</option>';
}
echo '</select>';
The above will output all of the timezones in select menu with the following format:
<select name="userTimeZone">
<option value="America/Los_Angeles">America/Los_Angeles [PDT -7]</option>
</select>
Timezone dropdown values in offset settings
You can get the time zone's offset by utilizing PHP's native DateTimeZone object. Here's updated tz_list():
function tz_list() {
$zones_array = array();
$timestamp = time();
$dummy_datetime_object = new DateTime();
foreach(timezone_identifiers_list() as $key => $zone) {
date_default_timezone_set($zone);
$zones_array[$key]['zone'] = $zone;
$zones_array[$key]['diff_from_GMT'] = 'UTC/GMT ' . date('P', $timestamp);
$tz = new DateTimeZone($zone);
$zones_array[$key]['offset'] = $tz->getOffset($dummy_datetime_object);
}
return $zones_array;
}
Use offset as value for your select's options.
PHP Timezone List
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",
);
Make timezone dropdown list populate with available timezones on a per Country basis?
Can't help with jQuery but for how to figure out what timezones are in each country, you can use DateTimeZone::listIdentifiers() with DateTimeZone::PER_COUNTRY as first argument and the ISO 3166-1 compatible country code as second argument, e.g.
DateTimeZone::listIdentifiers(DateTimeZone::PER_COUNTRY, 'GB');
Note: PHP 5.3 is required.
PHP - Filters List of Timezone as Array
This is my solution. I have an hardcoded array with the timezone identifier and display (for frontend use), which I use to generate an array with the right offset displays.
static function generateTimeZoneList()
{
static $timezone_list;
if(!isset($timezone_list) || empty($timezone_list))
{
$identifiers = self::getIdentifiers(); //get identifiers list
$temp_list = array();
foreach( $identifiers as $timezone => $display )
{
$tz = new DateTimeZone($timezone);
$temp_list[$timezone] = $tz->getOffset(new DateTime);
}
// sort timezone by offset
asort($temp_list);
foreach($temp_list as $timezone => $offset)
{
$offset_prefix = $offset < 0 ? '-' : '+';
$offset_formatted = gmdate( 'H:i', abs($offset) );
$pretty_offset = "GMT${offset_prefix}${offset_formatted}";
$display = $identifiers[$timezone];
$timezone_list[$timezone] = "($pretty_offset) $display";
}
}
return $timezone_list;
}
/**
* Format: identifier => display name
*/
static function getIdentifiers()
{
static $identifiers = array(
"Africa/Cairo" => " Cairo",
"Africa/Casablanca" => " Casablanca",
"Africa/Harare" => " Harare",
"Africa/Johannesburg" => " Pretoria",
"Africa/Lagos" => " West Central Africa",
"Africa/Monrovia" => " Monrovia",
"Africa/Nairobi" => " Nairobi",
"America/Argentina/Buenos_Aires" => " Buenos Aires",
"America/Argentina/Buenos_Aires" => " Georgetown",
"America/Bogota" => " Quito",
"America/Bogota" => " Bogota",
"America/Caracas" => " Caracas",
"America/Chihuahua" => " La Paz",
"America/Chihuahua" => " Chihuahua",
"America/Godthab" => " Greenland",
"America/La_Paz" => " La Paz",
"America/Lima" => " Lima",
"America/Los_Angeles" => " Pacific Time (US & Canada)",
"America/Managua" => " Central America",
"America/Mazatlan" => " Mazatlan",
"America/Mexico_City" => " Mexico City",
"America/Mexico_City" => " Guadalajara",
"America/Monterrey" => " Monterrey",
"America/Noronha" => " Mid-Atlantic",
"America/Santiago" => " Santiago",
"America/Sao_Paulo" => " Brasilia",
"America/Tijuana" => " Tijuana",
"Asia/Almaty" => " Almaty",
"Asia/Baghdad" => " Baghdad",
"Asia/Baku" => " Baku",
"Asia/Bangkok" => " Hanoi",
"Asia/Bangkok" => " Bangkok",
"Asia/Calcutta" => " Chennai",
"Asia/Calcutta" => " Mumbai",
"Asia/Calcutta" => " New Delhi",
"Asia/Calcutta" => " Sri Jayawardenepura",
"Asia/Chongqing" => " Chongqing",
"Asia/Dhaka" => " Dhaka",
"Asia/Dhaka" => " Astana",
"Asia/Hong_Kong" => " Beijing",
"Asia/Hong_Kong" => " Hong Kong",
"Asia/Irkutsk" => " Irkutsk",
"Asia/Jakarta" => " Jakarta",
"Asia/Jerusalem" => " Jerusalem",
"Asia/Kabul" => " Kabul",
"Asia/Kamchatka" => " Kamchatka",
"Asia/Karachi" => " Karachi",
"Asia/Karachi" => " Islamabad",
"Asia/Katmandu" => " Kathmandu",
"Asia/Kolkata" => " Kolkata",
"Asia/Krasnoyarsk" => " Krasnoyarsk",
"Asia/Kuala_Lumpur" => " Kuala Lumpur",
"Asia/Kuwait" => " Kuwait",
"Asia/Magadan" => " Solomon Is.",
"Asia/Magadan" => " Magadan",
"Asia/Magadan" => " New Caledonia",
"Asia/Muscat" => " Abu Dhabi",
"Asia/Muscat" => " Muscat",
"Asia/Novosibirsk" => " Novosibirsk",
"Asia/Rangoon" => " Rangoon",
"Asia/Riyadh" => " Riyadh",
"Asia/Seoul" => " Seoul",
"Asia/Singapore" => " Singapore",
"Asia/Taipei" => " Taipei",
"Asia/Tashkent" => " Tashkent",
"Asia/Tbilisi" => " Tbilisi",
"Asia/Tehran" => " Tehran",
"Asia/Tokyo" => " Osaka",
"Asia/Tokyo" => " Tokyo",
"Asia/Tokyo" => " Sapporo",
"Asia/Ulan_Bator" => " Ulaan Bataar",
"Asia/Urumqi" => " Urumqi",
"Asia/Vladivostok" => " Vladivostok",
"Asia/Yakutsk" => " Yakutsk",
"Asia/Yekaterinburg" => " Ekaterinburg",
"Asia/Yerevan" => " Yerevan",
"Atlantic/Azores" => " Azores",
"Atlantic/Cape_Verde" => " Cape Verde Is.",
"Australia/Adelaide" => " Adelaide",
"Australia/Brisbane" => " Brisbane",
"Australia/Canberra" => " Canberra",
"Australia/Darwin" => " Darwin",
"Australia/Hobart" => " Hobart",
"Australia/Melbourne" => " Melbourne",
"Australia/Perth" => " Perth",
"Australia/Sydney" => " Sydney",
"Canada/Atlantic" => " Atlantic Time (Canada)",
"Canada/Newfoundland" => " Newfoundland",
"Canada/Saskatchewan" => " Saskatchewan",
"Etc/Greenwich" => " Greenwich Mean Time : Dublin",
"Europe/Amsterdam" => " Amsterdam",
"Europe/Athens" => " Athens",
"Europe/Belgrade" => " Belgrade",
"Europe/Berlin" => " Berlin",
"Europe/Berlin" => " Bern",
"Europe/Bratislava" => " Bratislava",
"Europe/Brussels" => " Brussels",
"Europe/Bucharest" => " Bucharest",
"Europe/Budapest" => " Budapest",
"Europe/Copenhagen" => " Copenhagen",
"Europe/Helsinki" => " Helsinki",
"Europe/Helsinki" => " Kyiv",
"Europe/Istanbul" => " Istanbul",
"Europe/Lisbon" => " Lisbon",
"Europe/Ljubljana" => " Ljubljana",
"Europe/London" => " Edinburgh",
"Europe/London" => " London",
"Europe/Madrid" => " Madrid",
"Europe/Minsk" => " Minsk",
"Europe/Moscow" => " St. Petersburg",
"Europe/Moscow" => " Moscow",
"Europe/Paris" => " Paris",
"Europe/Prague" => " Prague",
"Europe/Riga" => " Riga",
"Europe/Rome" => " Rome",
"Europe/Sarajevo" => " Sarajevo",
"Europe/Skopje" => " Skopje",
"Europe/Sofia" => " Sofia",
"Europe/Stockholm" => " Stockholm",
"Europe/Tallinn" => " Tallinn",
"Europe/Vienna" => " Vienna",
"Europe/Vilnius" => " Vilnius",
"Europe/Volgograd" => " Volgograd",
"Europe/Warsaw" => " Warsaw",
"Europe/Zagreb" => " Zagreb",
"Pacific/Auckland" => " Wellington",
"Pacific/Auckland" => " Auckland",
"Pacific/Fiji" => " Fiji",
"Pacific/Fiji" => " Marshall Is.",
"Pacific/Guam" => " Guam",
"Pacific/Honolulu" => " Hawaii",
"Pacific/Kwajalein" => " International Date Line West",
"Pacific/Midway" => " Midway Island",
"Pacific/Port_Moresby" => " Port Moresby",
"Pacific/Samoa" => " Samoa",
"Pacific/Tongatapu" => " Nuku'alofa",
"US/Alaska" => " Alaska",
"US/Arizona" => " Arizona",
"US/Central" => " Central Time (US & Canada)",
"US/East-Indiana" => " Indiana (East)",
"US/Eastern" => " Eastern Time (US & Canada)",
"US/Mountain" => " Mountain Time (US & Canada)",
"UTC" => " UTC"
);
return $identifiers;
}
The result looks similar to this,
array (size=121)
'Pacific/Midway' => string '(GMT-11:00) Midway Island' (length=26)
'Pacific/Samoa' => string '(GMT-11:00) Samoa' (length=18)
'Pacific/Honolulu' => string '(GMT-10:00) Hawaii' (length=19)
'US/Alaska' => string '(GMT-08:00) Alaska' (length=19)
'America/Los_Angeles' => string '(GMT-07:00) Pacific Time (US & Canada)' (length=39)
'US/Arizona' => string '(GMT-07:00) Arizona' (length=20)
'America/Tijuana' => string '(GMT-07:00) Tijuana' (length=20)
'Canada/Saskatchewan' => string '(GMT-06:00) Saskatchewan' (length=25)
'America/Managua' => string '(GMT-06:00) Central America' (length=28)
'America/Mazatlan' => string '(GMT-06:00) Mazatlan' (length=21)
'America/Chihuahua' => string '(GMT-06:00) Chihuahua' (length=22)
'US/Mountain' => string '(GMT-06:00) Mountain Time (US & Canada)' (length=40)
'America/Lima' => string '(GMT-05:00) Lima' (length=17)
Get all timezones
You can use IntlTimeZone::getDisplayName(), e.g.:
echo IntlTimeZone::createTimeZone("Australia/Darwin")->getDisplayName();
Outputs:
Australian Central Standard Time
Though many will change throughout the year for daylight saving. If you want to check for this and add the alternate daylight/summer display name you can do something like:
$tz = IntlTimeZone::createTimeZone("America/Los_Angeles");
echo $tz->getDisplayName(), "\n";
if ($tz->useDaylightTime()) {
echo $tz->getDisplayName(true);
}
which outputs:
Pacific Standard Time
Pacific Daylight Time
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