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I am building a website with a forum that I am building myself. I just don't know how to let the user change their time zone. My server time zone is my time zone (date_default_timezone_set('Europe/London');). Please could I have some help with this.

Thanks in advance,
Cameron

Member Avatar for diafol
$sel = ...(a recognized timezone)...;

date_default_timezone_set($sel);

Here's an array of timezones I picked up. You can loop through the array to create a dropdown:

$data_tz = array("Africa/Abidjan","Africa/Accra","Africa/Addis_Ababa","Africa/Algiers","Africa/Asmara","Africa/Asmera","Africa/Bamako","Africa/Bangui","Africa/Banjul","Africa/Bissau","Africa/Blantyre","Africa/Brazzaville","Africa/Bujumbura","Africa/Cairo","Africa/Casablanca","Africa/Ceuta","Africa/Conakry","Africa/Dakar","Africa/Dar_es_Salaam","Africa/Djibouti","Africa/Douala","Africa/El_Aaiun","Africa/Freetown","Africa/Gaborone","Africa/Harare","Africa/Johannesburg","Africa/Kampala","Africa/Khartoum","Africa/Kigali","Africa/Kinshasa","Africa/Lagos","Africa/Libreville","Africa/Lome","Africa/Luanda","Africa/Lubumbashi","Africa/Lusaka","Africa/Malabo","Africa/Maputo","Africa/Maseru","Africa/Mbabane","Africa/Mogadishu","Africa/Monrovia","Africa/Nairobi","Africa/Ndjamena","Africa/Niamey","Africa/Nouakchott","Africa/Ouagadougou","Africa/Porto-Novo","Africa/Sao_Tome","Africa/Timbuktu","Africa/Tripoli","Africa/Tunis","Africa/Windhoek","America/Adak","America/Anchorage","America/Anguilla","America/Antigua","America/Araguaina","America/Argentina/Buenos_Aires","America/Argentina/Catamarca","America/Argentina/ComodRivadavia","America/Argentina/Cordoba","America/Argentina/Jujuy","America/Argentina/La_Rioja","America/Argentina/Mendoza","America/Argentina/Rio_Gallegos","America/Argentina/Salta","America/Argentina/San_Juan","America/Argentina/San_Luis","America/Argentina/Tucuman","America/Argentina/Ushuaia","America/Aruba","America/Asuncion","America/Atikokan","America/Atka","America/Bahia","America/Barbados","America/Belem","America/Belize","America/Blanc-Sablon","America/Boa_Vista","America/Bogota","America/Boise","America/Buenos_Aires","America/Cambridge_Bay","America/Campo_Grande","America/Cancun","America/Caracas","America/Catamarca","America/Cayenne","America/Cayman","America/Chicago","America/Chihuahua","America/Coral_Harbour","America/Cordoba","America/Costa_Rica","America/Cuiaba","America/Curacao","America/Danmarkshavn","America/Dawson","America/Dawson_Creek","America/Denver","America/Detroit","America/Dominica","America/Edmonton","America/Eirunepe","America/El_Salvador","America/Ensenada","America/Fort_Wayne","America/Fortaleza","America/Glace_Bay","America/Godthab","America/Goose_Bay","America/Grand_Turk","America/Grenada","America/Guadeloupe","America/Guatemala","America/Guayaquil","America/Guyana","America/Halifax","America/Havana","America/Hermosillo","America/Indiana/Indianapolis","America/Indiana/Knox","America/Indiana/Marengo","America/Indiana/Petersburg","America/Indiana/Tell_City","America/Indiana/Vevay","America/Indiana/Vincennes","America/Indiana/Winamac","America/Indianapolis","America/Inuvik","America/Iqaluit","America/Jamaica","America/Jujuy","America/Juneau","America/Kentucky/Louisville","America/Kentucky/Monticello","America/Knox_IN","America/La_Paz","America/Lima","America/Los_Angeles","America/Louisville","America/Maceio","America/Managua","America/Manaus","America/Marigot","America/Martinique","America/Matamoros","America/Mazatlan","America/Mendoza","America/Menominee","America/Merida","America/Mexico_City","America/Miquelon","America/Moncton","America/Monterrey","America/Montevideo","America/Montreal","America/Montserrat","America/Nassau","America/New_York","America/Nipigon","America/Nome","America/Noronha","America/North_Dakota/Center","America/North_Dakota/New_Salem","America/Ojinaga","America/Panama","America/Pangnirtung","America/Paramaribo","America/Phoenix","America/Port-au-Prince","America/Port_of_Spain","America/Porto_Acre","America/Porto_Velho","America/Puerto_Rico","America/Rainy_River","America/Rankin_Inlet","America/Recife","America/Regina","America/Resolute","America/Rio_Branco","America/Rosario","America/Santa_Isabel","America/Santarem","America/Santiago","America/Santo_Domingo","America/Sao_Paulo","America/Scoresbysund","America/Shiprock","America/St_Barthelemy","America/St_Johns","America/St_Kitts","America/St_Lucia","America/St_Thomas","America/St_Vincent","America/Swift_Current","America/Tegucigalpa","America/Thule","America/Thunder_Bay","America/Tijuana","America/Toronto","America/Tortola","America/Vancouver","America/Virgin","America/Whitehorse","America/Winnipeg","America/Yakutat","America/Yellowknife","Antarctica/Casey","Antarctica/Davis","Antarctica/DumontDUrville","Antarctica/Mawson","Antarctica/McMurdo","Antarctica/Palmer","Antarctica/Rothera","Antarctica/South_Pole","Antarctica/Syowa","Antarctica/Vostok","Arctic/Longyearbyen","Asia/Aden","Asia/Almaty","Asia/Amman","Asia/Anadyr","Asia/Aqtau","Asia/Aqtobe","Asia/Ashgabat","Asia/Ashkhabad","Asia/Baghdad","Asia/Bahrain","Asia/Baku","Asia/Bangkok","Asia/Beijing","Asia/Beirut","Asia/Bishkek","Asia/Brunei","Asia/Calcutta","Asia/Choibalsan","Asia/Chongqing","Asia/Chungking","Asia/Colombo","Asia/Dacca","Asia/Damascus","Asia/Dhaka","Asia/Dili","Asia/Dubai","Asia/Dushanbe","Asia/Gaza","Asia/Harbin","Asia/Ho_Chi_Minh","Asia/Hong_Kong","Asia/Hovd","Asia/Irkutsk","Asia/Istanbul","Asia/Jakarta","Asia/Jayapura","Asia/Jerusalem","Asia/Kabul","Asia/Kamchatka","Asia/Karachi","Asia/Kashgar","Asia/Kathmandu","Asia/Katmandu","Asia/Kolkata","Asia/Krasnoyarsk","Asia/Kuala_Lumpur","Asia/Kuching","Asia/Kuwait","Asia/Macao","Asia/Macau","Asia/Magadan","Asia/Makassar","Asia/Manila","Asia/Muscat","Asia/Nicosia","Asia/Novokuznetsk","Asia/Novosibirsk","Asia/Omsk","Asia/Oral","Asia/Phnom_Penh","Asia/Pontianak","Asia/Pyongyang","Asia/Qatar","Asia/Qyzylorda","Asia/Rangoon","Asia/Riyadh","Asia/Riyadh87","Asia/Riyadh88","Asia/Riyadh89","Asia/Saigon","Asia/Sakhalin","Asia/Samarkand","Asia/Seoul","Asia/Shanghai","Asia/Singapore","Asia/Taipei","Asia/Tashkent","Asia/Tbilisi","Asia/Tehran","Asia/Tel_Aviv","Asia/Thimbu","Asia/Thimphu","Asia/Tokyo","Asia/Ujung_Pandang","Asia/Ulaanbaatar","Asia/Ulan_Bator","Asia/Urumqi","Asia/Vientiane","Asia/Vladivostok","Asia/Yakutsk","Asia/Yekaterinburg","Asia/Yerevan","Atlantic/Azores","Atlantic/Bermuda","Atlantic/Canary","Atlantic/Cape_Verde","Atlantic/Faeroe","Atlantic/Faroe","Atlantic/Jan_Mayen","Atlantic/Madeira","Atlantic/Reykjavik","Atlantic/South_Georgia","Atlantic/St_Helena","Atlantic/Stanley","Australia/ACT","Australia/Adelaide","Australia/Brisbane","Australia/Broken_Hill","Australia/Canberra","Australia/Currie","Australia/Darwin","Australia/Eucla","Australia/Hobart","Australia/LHI","Australia/Lindeman","Australia/Lord_Howe","Australia/Melbourne","Australia/NSW","Australia/North","Australia/Perth","Australia/Queensland","Australia/South","Australia/Sydney","Australia/Tasmania","Australia/Victoria","Australia/West","Australia/Yancowinna","Brazil/Acre","Brazil/DeNoronha","Brazil/East","Brazil/West","CET","CST6CDT","Canada/Atlantic","Canada/Central","Canada/East-Saskatchewan","Canada/Eastern","Canada/Mountain","Canada/Newfoundland","Canada/Pacific","Canada/Saskatchewan","Canada/Yukon","Chile/Continental","Chile/EasterIsland","Cuba","EET","EST","EST5EDT","Egypt","Eire","Etc/GMT","Etc/GMT+0","Etc/GMT+1","Etc/GMT+10","Etc/GMT+11","Etc/GMT+12","Etc/GMT+2","Etc/GMT+3","Etc/GMT+4","Etc/GMT+5","Etc/GMT+6","Etc/GMT+7","Etc/GMT+8","Etc/GMT+9","Etc/GMT-0","Etc/GMT-1","Etc/GMT-10","Etc/GMT-11","Etc/GMT-12","Etc/GMT-13","Etc/GMT-14","Etc/GMT-2","Etc/GMT-3","Etc/GMT-4","Etc/GMT-5","Etc/GMT-6","Etc/GMT-7","Etc/GMT-8","Etc/GMT-9","Etc/GMT0","Etc/Greenwich","Etc/UCT","Etc/UTC","Etc/Universal","Etc/Zulu","Europe/Amsterdam","Europe/Andorra","Europe/Athens","Europe/Belfast","Europe/Belgrade","Europe/Berlin","Europe/Bratislava","Europe/Brussels","Europe/Bucharest","Europe/Budapest","Europe/Chisinau","Europe/Copenhagen","Europe/Dublin","Europe/Gibraltar","Europe/Guernsey","Europe/Helsinki","Europe/Isle_of_Man","Europe/Istanbul","Europe/Jersey","Europe/Kaliningrad","Europe/Kiev","Europe/Lisbon","Europe/Ljubljana","Europe/London","Europe/Luxembourg","Europe/Madrid","Europe/Malta","Europe/Mariehamn","Europe/Minsk","Europe/Monaco","Europe/Moscow","Europe/Nicosia","Europe/Oslo","Europe/Paris","Europe/Podgorica","Europe/Prague","Europe/Riga","Europe/Rome","Europe/Samara","Europe/San_Marino","Europe/Sarajevo","Europe/Simferopol","Europe/Skopje","Europe/Sofia","Europe/Stockholm","Europe/Tallinn","Europe/Tirane","Europe/Tiraspol","Europe/Uzhgorod","Europe/Vaduz","Europe/Vatican","Europe/Vienna","Europe/Vilnius","Europe/Volgograd","Europe/Warsaw","Europe/Zagreb","Europe/Zaporozhye","Europe/Zurich","Factory","GB","GB-Eire","GMT","Greenwich","HST","Hongkong","Iceland","Indian/Antananarivo","Indian/Chagos","Indian/Christmas","Indian/Cocos","Indian/Comoro","Indian/Kerguelen","Indian/Mahe","Indian/Maldives","Indian/Mauritius","Indian/Mayotte","Indian/Reunion","Iran","Israel","Jamaica","Japan","Kwajalein","Libya","MET","MST","MST7MDT","Mexico/BajaNorte","Mexico/BajaSur","Mexico/General","Mideast/Riyadh87","Mideast/Riyadh88","Mideast/Riyadh89","NZ","NZ-CHAT","Navajo","PRC","PST8PDT","Pacific/Apia","Pacific/Auckland","Pacific/Chatham","Pacific/Easter","Pacific/Efate","Pacific/Enderbury","Pacific/Fakaofo","Pacific/Fiji","Pacific/Funafuti","Pacific/Galapagos","Pacific/Gambier","Pacific/Guadalcanal","Pacific/Guam","Pacific/Honolulu","Pacific/Johnston","Pacific/Kiritimati","Pacific/Kosrae","Pacific/Kwajalein","Pacific/Majuro","Pacific/Marquesas","Pacific/Midway","Pacific/Nauru","Pacific/Niue","Pacific/Norfolk","Pacific/Noumea","Pacific/Pago_Pago","Pacific/Palau","Pacific/Pitcairn","Pacific/Ponape","Pacific/Port_Moresby","Pacific/Rarotonga","Pacific/Saipan","Pacific/Samoa","Pacific/Tahiti","Pacific/Tarawa","Pacific/Tongatapu","Pacific/Truk","Pacific/Wake","Pacific/Wallis","Pacific/Yap","Poland","Portugal","ROC","ROK","Singapore","Turkey","UCT","US/Alaska","US/Aleutian","US/Arizona","US/Central","US/East-Indiana","US/Eastern","US/Hawaii","US/Indiana-Starke","US/Michigan","US/Mountain","US/Pacific","US/Pacific-New","US/Samoa","Universal","W-SU","WET","Zulu");

Check out an implementation on my bits'n'pieces site: http://www.diafol.org/datetime.php

commented: Thanks, I forgot about this post!!! +3
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