Error: Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized. The data structure looks like this: $data = array ( 'Africa' => array ( 'Africa/Abidjan' => 'Abidjan', 'Africa/Accra' => 'Accra', 'Africa/Addis_Ababa' => 'Addis Ababa', 'Africa/Algiers' => 'Algiers', 'Africa/Asmara' => 'Asmara', 'Africa/Bamako' => 'Bamako', 'Africa/Bangui' => 'Bangui', 'Africa/Banjul' => 'Banjul', 'Africa/Bissau' => 'Bissau', 'Africa/Blantyre' => 'Blantyre', 'Africa/Brazzaville' => 'Brazzaville', 'Africa/Bujumbura' => 'Bujumbura', 'Africa/Cairo' => 'Cairo', 'Africa/Casablanca' => 'Casablanca', 'Africa/Ceuta' => 'Ceuta', 'Africa/Conakry' => 'Conakry', 'Africa/Dakar' => 'Dakar', 'Africa/Dar_es_Salaam' => 'Dar es Salaam', 'Africa/Djibouti' => 'Djibouti', 'Africa/Douala' => 'Douala', 'Africa/El_Aaiun' => 'El Aaiun', 'Africa/Freetown' => 'Freetown', 'Africa/Gaborone' => 'Gaborone', 'Africa/Harare' => 'Harare', 'Africa/Johannesburg' => 'Johannesburg', 'Africa/Kampala' => 'Kampala', 'Africa/Khartoum' => 'Khartoum', 'Africa/Kigali' => 'Kigali', 'Africa/Kinshasa' => 'Kinshasa', 'Africa/Lagos' => 'Lagos', 'Africa/Libreville' => 'Libreville', 'Africa/Lome' => 'Lome', 'Africa/Luanda' => 'Luanda', 'Africa/Lubumbashi' => 'Lubumbashi', 'Africa/Lusaka' => 'Lusaka', 'Africa/Malabo' => 'Malabo', 'Africa/Maputo' => 'Maputo', 'Africa/Maseru' => 'Maseru', 'Africa/Mbabane' => 'Mbabane', 'Africa/Mogadishu' => 'Mogadishu', 'Africa/Monrovia' => 'Monrovia', 'Africa/Nairobi' => 'Nairobi', 'Africa/Ndjamena' => 'Ndjamena', 'Africa/Niamey' => 'Niamey', 'Africa/Nouakchott' => 'Nouakchott', 'Africa/Ouagadougou' => 'Ouagadougou', 'Africa/Porto-Novo' => 'Porto-Novo', 'Africa/Sao_Tome' => 'Sao Tome', 'Africa/Tripoli' => 'Tripoli', 'Africa/Tunis' => 'Tunis', 'Africa/Windhoek' => 'Windhoek', ), 'America' => array ( 'America/Adak' => 'Adak', 'America/Anchorage' => 'Anchorage', 'America/Anguilla' => 'Anguilla', 'America/Antigua' => 'Antigua', 'America/Araguaina' => 'Araguaina', 'America/Argentina/Buenos_Aires' => 'Argentina - Buenos Aires', 'America/Argentina/Catamarca' => 'Argentina - Catamarca', 'America/Argentina/Cordoba' => 'Argentina - Cordoba', 'America/Argentina/Jujuy' => 'Argentina - Jujuy', 'America/Argentina/La_Rioja' => 'Argentina - La Rioja', 'America/Argentina/Mendoza' => 'Argentina - Mendoza', 'America/Argentina/Rio_Gallegos' => 'Argentina - Rio Gallegos', 'America/Argentina/Salta' => 'Argentina - Salta', 'America/Argentina/San_Juan' => 'Argentina - San Juan', 'America/Argentina/San_Luis' => 'Argentina - San Luis', 'America/Argentina/Tucuman' => 'Argentina - Tucuman', 'America/Argentina/Ushuaia' => 'Argentina - Ushuaia', 'America/Aruba' => 'Aruba', 'America/Asuncion' => 'Asuncion', 'America/Atikokan' => 'Atikokan', 'America/Bahia' => 'Bahia', 'America/Bahia_Banderas' => 'Bahia Banderas', 'America/Barbados' => 'Barbados', 'America/Belem' => 'Belem', 'America/Belize' => 'Belize', 'America/Blanc-Sablon' => 'Blanc-Sablon', 'America/Boa_Vista' => 'Boa Vista', 'America/Bogota' => 'Bogota', 'America/Boise' => 'Boise', 'America/Cambridge_Bay' => 'Cambridge Bay', 'America/Campo_Grande' => 'Campo Grande', 'America/Cancun' => 'Cancun', 'America/Caracas' => 'Caracas', 'America/Cayenne' => 'Cayenne', 'America/Cayman' => 'Cayman', 'America/Chicago' => 'Chicago', 'America/Chihuahua' => 'Chihuahua', 'America/Costa_Rica' => 'Costa Rica', 'America/Cuiaba' => 'Cuiaba', 'America/Curacao' => 'Curacao', 'America/Danmarkshavn' => 'Danmarkshavn', 'America/Dawson' => 'Dawson', 'America/Dawson_Creek' => 'Dawson Creek', 'America/Denver' => 'Denver', 'America/Detroit' => 'Detroit', 'America/Dominica' => 'Dominica', 'America/Edmonton' => 'Edmonton', 'America/Eirunepe' => 'Eirunepe', 'America/El_Salvador' => 'El Salvador', 'America/Fortaleza' => 'Fortaleza', 'America/Glace_Bay' => 'Glace Bay', 'America/Godthab' => 'Godthab', 'America/Goose_Bay' => 'Goose Bay', 'America/Grand_Turk' => 'Grand Turk', 'America/Grenada' => 'Grenada', 'America/Guadeloupe' => 'Guadeloupe', 'America/Guatemala' => 'Guatemala', 'America/Guayaquil' => 'Guayaquil', 'America/Guyana' => 'Guyana', 'America/Halifax' => 'Halifax', 'America/Havana' => 'Havana', 'America/Hermosillo' => 'Hermosillo', 'America/Indiana/Indianapolis' => 'Indiana - Indianapolis', 'America/Indiana/Knox' => 'Indiana - Knox', 'America/Indiana/Marengo' => 'Indiana - Marengo', 'America/Indiana/Petersburg' => 'Indiana - Petersburg', 'America/Indiana/Tell_City' => 'Indiana - Tell City', 'America/Indiana/Vevay' => 'Indiana - Vevay', 'America/Indiana/Vincennes' => 'Indiana - Vincennes', 'America/Indiana/Winamac' => 'Indiana - Winamac', 'America/Inuvik' => 'Inuvik', 'America/Iqaluit' => 'Iqaluit', 'America/Jamaica' => 'Jamaica', 'America/Juneau' => 'Juneau', 'America/Kentucky/Louisville' => 'Kentucky - Louisville', 'America/Kentucky/Monticello' => 'Kentucky - Monticello', 'America/La_Paz' => 'La Paz', 'America/Lima' => 'Lima', 'America/Los_Angeles' => 'Los Angeles', 'America/Maceio' => 'Maceio', 'America/Managua' => 'Managua', 'America/Manaus' => 'Manaus', 'America/Marigot' => 'Marigot', 'America/Martinique' => 'Martinique', 'America/Matamoros' => 'Matamoros', 'America/Mazatlan' => 'Mazatlan', 'America/Menominee' => 'Menominee', 'America/Merida' => 'Merida', 'America/Mexico_City' => 'Mexico City', 'America/Miquelon' => 'Miquelon', 'America/Moncton' => 'Moncton', 'America/Monterrey' => 'Monterrey', 'America/Montevideo' => 'Montevideo', 'America/Montreal' => 'Montreal', 'America/Montserrat' => 'Montserrat', 'America/Nassau' => 'Nassau', 'America/New_York' => 'New York', 'America/Nipigon' => 'Nipigon', 'America/Nome' => 'Nome', 'America/Noronha' => 'Noronha', 'America/North_Dakota/Center' => 'North Dakota - Center', 'America/North_Dakota/New_Salem' => 'North Dakota - New Salem', 'America/Ojinaga' => 'Ojinaga', 'America/Panama' => 'Panama', 'America/Pangnirtung' => 'Pangnirtung', 'America/Paramaribo' => 'Paramaribo', 'America/Phoenix' => 'Phoenix', 'America/Port-au-Prince' => 'Port-au-Prince', 'America/Port_of_Spain' => 'Port of Spain', 'America/Porto_Velho' => 'Porto Velho', 'America/Puerto_Rico' => 'Puerto Rico', 'America/Rainy_River' => 'Rainy River', 'America/Rankin_Inlet' => 'Rankin Inlet', 'America/Recife' => 'Recife', 'America/Regina' => 'Regina', 'America/Resolute' => 'Resolute', 'America/Rio_Branco' => 'Rio Branco', 'America/Santa_Isabel' => 'Santa Isabel', 'America/Santarem' => 'Santarem', 'America/Santiago' => 'Santiago', 'America/Santo_Domingo' => 'Santo Domingo', 'America/Sao_Paulo' => 'Sao Paulo', 'America/Scoresbysund' => 'Scoresbysund', 'America/Shiprock' => 'Shiprock', 'America/St_Barthelemy' => 'St Barthelemy', 'America/St_Johns' => 'St Johns', 'America/St_Kitts' => 'St Kitts', 'America/St_Lucia' => 'St Lucia', 'America/St_Thomas' => 'St Thomas', 'America/St_Vincent' => 'St Vincent', 'America/Swift_Current' => 'Swift Current', 'America/Tegucigalpa' => 'Tegucigalpa', 'America/Thule' => 'Thule', 'America/Thunder_Bay' => 'Thunder Bay', 'America/Tijuana' => 'Tijuana', 'America/Toronto' => 'Toronto', 'America/Tortola' => 'Tortola', 'America/Vancouver' => 'Vancouver', 'America/Whitehorse' => 'Whitehorse', 'America/Winnipeg' => 'Winnipeg', 'America/Yakutat' => 'Yakutat', 'America/Yellowknife' => 'Yellowknife', ), 'Antarctica' => array ( 'Antarctica/Casey' => 'Casey', 'Antarctica/Davis' => 'Davis', 'Antarctica/DumontDUrville' => 'DumontDUrville', 'Antarctica/Macquarie' => 'Macquarie', 'Antarctica/Mawson' => 'Mawson', 'Antarctica/McMurdo' => 'McMurdo', 'Antarctica/Palmer' => 'Palmer', 'Antarctica/Rothera' => 'Rothera', 'Antarctica/South_Pole' => 'South Pole', 'Antarctica/Syowa' => 'Syowa', 'Antarctica/Vostok' => 'Vostok', ), 'Arctic' => array ( 'Arctic/Longyearbyen' => 'Longyearbyen', ), 'Asia' => array ( 'Asia/Aden' => 'Aden', 'Asia/Almaty' => 'Almaty', 'Asia/Amman' => 'Amman', 'Asia/Anadyr' => 'Anadyr', 'Asia/Aqtau' => 'Aqtau', 'Asia/Aqtobe' => 'Aqtobe', 'Asia/Ashgabat' => 'Ashgabat', 'Asia/Baghdad' => 'Baghdad', 'Asia/Bahrain' => 'Bahrain', 'Asia/Baku' => 'Baku', 'Asia/Bangkok' => 'Bangkok', 'Asia/Beirut' => 'Beirut', 'Asia/Bishkek' => 'Bishkek', 'Asia/Brunei' => 'Brunei', 'Asia/Choibalsan' => 'Choibalsan', 'Asia/Chongqing' => 'Chongqing', 'Asia/Colombo' => 'Colombo', 'Asia/Damascus' => 'Damascus', 'Asia/Dhaka' => 'Dhaka', 'Asia/Dili' => 'Dili', 'Asia/Dubai' => 'Dubai', 'Asia/Dushanbe' => 'Dushanbe', 'Asia/Gaza' => 'Gaza', 'Asia/Harbin' => 'Harbin', 'Asia/Ho_Chi_Minh' => 'Ho Chi Minh', 'Asia/Hong_Kong' => 'Hong Kong', 'Asia/Hovd' => 'Hovd', 'Asia/Irkutsk' => 'Irkutsk', 'Asia/Jakarta' => 'Jakarta', 'Asia/Jayapura' => 'Jayapura', 'Asia/Jerusalem' => 'Jerusalem', 'Asia/Kabul' => 'Kabul', 'Asia/Kamchatka' => 'Kamchatka', 'Asia/Karachi' => 'Karachi', 'Asia/Kashgar' => 'Kashgar', 'Asia/Kathmandu' => 'Kathmandu', 'Asia/Kolkata' => 'Kolkata', 'Asia/Krasnoyarsk' => 'Krasnoyarsk', 'Asia/Kuala_Lumpur' => 'Kuala Lumpur', 'Asia/Kuching' => 'Kuching', 'Asia/Kuwait' => 'Kuwait', 'Asia/Macau' => 'Macau', 'Asia/Magadan' => 'Magadan', 'Asia/Makassar' => 'Makassar', 'Asia/Manila' => 'Manila', 'Asia/Muscat' => 'Muscat', 'Asia/Nicosia' => 'Nicosia', 'Asia/Novokuznetsk' => 'Novokuznetsk', 'Asia/Novosibirsk' => 'Novosibirsk', 'Asia/Omsk' => 'Omsk', 'Asia/Oral' => 'Oral', 'Asia/Phnom_Penh' => 'Phnom Penh', 'Asia/Pontianak' => 'Pontianak', 'Asia/Pyongyang' => 'Pyongyang', 'Asia/Qatar' => 'Qatar', 'Asia/Qyzylorda' => 'Qyzylorda', 'Asia/Rangoon' => 'Rangoon', 'Asia/Riyadh' => 'Riyadh', 'Asia/Sakhalin' => 'Sakhalin', 'Asia/Samarkand' => 'Samarkand', 'Asia/Seoul' => 'Seoul', 'Asia/Shanghai' => 'Shanghai', 'Asia/Singapore' => 'Singapore', 'Asia/Taipei' => 'Taipei', 'Asia/Tashkent' => 'Tashkent', 'Asia/Tbilisi' => 'Tbilisi', 'Asia/Tehran' => 'Tehran', 'Asia/Thimphu' => 'Thimphu', 'Asia/Tokyo' => 'Tokyo', 'Asia/Ulaanbaatar' => 'Ulaanbaatar', 'Asia/Urumqi' => 'Urumqi', 'Asia/Vientiane' => 'Vientiane', 'Asia/Vladivostok' => 'Vladivostok', 'Asia/Yakutsk' => 'Yakutsk', 'Asia/Yekaterinburg' => 'Yekaterinburg', 'Asia/Yerevan' => 'Yerevan', ), 'Atlantic' => array ( 'Atlantic/Azores' => 'Azores', 'Atlantic/Bermuda' => 'Bermuda', 'Atlantic/Canary' => 'Canary', 'Atlantic/Cape_Verde' => 'Cape Verde', 'Atlantic/Faroe' => 'Faroe', 'Atlantic/Madeira' => 'Madeira', 'Atlantic/Reykjavik' => 'Reykjavik', 'Atlantic/South_Georgia' => 'South Georgia', 'Atlantic/St_Helena' => 'St Helena', 'Atlantic/Stanley' => 'Stanley', ), 'Australia' => array ( 'Australia/Adelaide' => 'Adelaide', 'Australia/Brisbane' => 'Brisbane', 'Australia/Broken_Hill' => 'Broken Hill', 'Australia/Currie' => 'Currie', 'Australia/Darwin' => 'Darwin', 'Australia/Eucla' => 'Eucla', 'Australia/Hobart' => 'Hobart', 'Australia/Lindeman' => 'Lindeman', 'Australia/Lord_Howe' => 'Lord Howe', 'Australia/Melbourne' => 'Melbourne', 'Australia/Perth' => 'Perth', 'Australia/Sydney' => 'Sydney', ), 'Europe' => array ( 'Europe/Amsterdam' => 'Amsterdam', 'Europe/Andorra' => 'Andorra', 'Europe/Athens' => 'Athens', 'Europe/Belgrade' => 'Belgrade', 'Europe/Berlin' => 'Berlin', 'Europe/Bratislava' => 'Bratislava', 'Europe/Brussels' => 'Brussels', 'Europe/Bucharest' => 'Bucharest', 'Europe/Budapest' => 'Budapest', 'Europe/Chisinau' => 'Chisinau', 'Europe/Copenhagen' => 'Copenhagen', 'Europe/Dublin' => 'Dublin', 'Europe/Gibraltar' => 'Gibraltar', 'Europe/Guernsey' => 'Guernsey', 'Europe/Helsinki' => 'Helsinki', 'Europe/Isle_of_Man' => 'Isle of Man', 'Europe/Istanbul' => 'Istanbul', 'Europe/Jersey' => 'Jersey', 'Europe/Kaliningrad' => 'Kaliningrad', 'Europe/Kiev' => 'Kiev', 'Europe/Lisbon' => 'Lisbon', 'Europe/Ljubljana' => 'Ljubljana', 'Europe/London' => 'London', 'Europe/Luxembourg' => 'Luxembourg', 'Europe/Madrid' => 'Madrid', 'Europe/Malta' => 'Malta', 'Europe/Mariehamn' => 'Mariehamn', 'Europe/Minsk' => 'Minsk', 'Europe/Monaco' => 'Monaco', 'Europe/Moscow' => 'Moscow', 'Europe/Oslo' => 'Oslo', 'Europe/Paris' => 'Paris', 'Europe/Podgorica' => 'Podgorica', 'Europe/Prague' => 'Prague', 'Europe/Riga' => 'Riga', 'Europe/Rome' => 'Rome', 'Europe/Samara' => 'Samara', 'Europe/San_Marino' => 'San Marino', 'Europe/Sarajevo' => 'Sarajevo', 'Europe/Simferopol' => 'Simferopol', 'Europe/Skopje' => 'Skopje', 'Europe/Sofia' => 'Sofia', 'Europe/Stockholm' => 'Stockholm', 'Europe/Tallinn' => 'Tallinn', 'Europe/Tirane' => 'Tirane', 'Europe/Uzhgorod' => 'Uzhgorod', 'Europe/Vaduz' => 'Vaduz', 'Europe/Vatican' => 'Vatican', 'Europe/Vienna' => 'Vienna', 'Europe/Vilnius' => 'Vilnius', 'Europe/Volgograd' => 'Volgograd', 'Europe/Warsaw' => 'Warsaw', 'Europe/Zagreb' => 'Zagreb', 'Europe/Zaporozhye' => 'Zaporozhye', 'Europe/Zurich' => 'Zurich', ), 'Indian' => array ( 'Indian/Antananarivo' => 'Antananarivo', 'Indian/Chagos' => 'Chagos', 'Indian/Christmas' => 'Christmas', 'Indian/Cocos' => 'Cocos', 'Indian/Comoro' => 'Comoro', 'Indian/Kerguelen' => 'Kerguelen', 'Indian/Mahe' => 'Mahe', 'Indian/Maldives' => 'Maldives', 'Indian/Mauritius' => 'Mauritius', 'Indian/Mayotte' => 'Mayotte', 'Indian/Reunion' => 'Reunion', ), 'Pacific' => array ( 'Pacific/Apia' => 'Apia', 'Pacific/Auckland' => 'Auckland', 'Pacific/Chatham' => 'Chatham', 'Pacific/Chuuk' => 'Chuuk', 'Pacific/Easter' => 'Easter', 'Pacific/Efate' => 'Efate', 'Pacific/Enderbury' => 'Enderbury', 'Pacific/Fakaofo' => 'Fakaofo', 'Pacific/Fiji' => 'Fiji', 'Pacific/Funafuti' => 'Funafuti', 'Pacific/Galapagos' => 'Galapagos', 'Pacific/Gambier' => 'Gambier', 'Pacific/Guadalcanal' => 'Guadalcanal', 'Pacific/Guam' => 'Guam', 'Pacific/Honolulu' => 'Honolulu', 'Pacific/Johnston' => 'Johnston', 'Pacific/Kiritimati' => 'Kiritimati', 'Pacific/Kosrae' => 'Kosrae', 'Pacific/Kwajalein' => 'Kwajalein', 'Pacific/Majuro' => 'Majuro', 'Pacific/Marquesas' => 'Marquesas', 'Pacific/Midway' => 'Midway', 'Pacific/Nauru' => 'Nauru', 'Pacific/Niue' => 'Niue', 'Pacific/Norfolk' => 'Norfolk', 'Pacific/Noumea' => 'Noumea', 'Pacific/Pago_Pago' => 'Pago Pago', 'Pacific/Palau' => 'Palau', 'Pacific/Pitcairn' => 'Pitcairn', 'Pacific/Pohnpei' => 'Pohnpei', 'Pacific/Port_Moresby' => 'Port Moresby', 'Pacific/Rarotonga' => 'Rarotonga', 'Pacific/Saipan' => 'Saipan', 'Pacific/Tahiti' => 'Tahiti', 'Pacific/Tarawa' => 'Tarawa', 'Pacific/Tongatapu' => 'Tongatapu', 'Pacific/Wake' => 'Wake', 'Pacific/Wallis' => 'Wallis', ), 'UTC' => array ( 'UTC-12' => 'UTC-12', 'UTC-11.5' => 'UTC-11:30', 'UTC-11' => 'UTC-11', 'UTC-10.5' => 'UTC-10:30', 'UTC-10' => 'UTC-10', 'UTC-9.5' => 'UTC-9:30', 'UTC-9' => 'UTC-9', 'UTC-8.5' => 'UTC-8:30', 'UTC-8' => 'UTC-8', 'UTC-7.5' => 'UTC-7:30', 'UTC-7' => 'UTC-7', 'UTC-6.5' => 'UTC-6:30', 'UTC-6' => 'UTC-6', 'UTC-5.5' => 'UTC-5:30', 'UTC-5' => 'UTC-5', 'UTC-4.5' => 'UTC-4:30', 'UTC-4' => 'UTC-4', 'UTC-3.5' => 'UTC-3:30', 'UTC-3' => 'UTC-3', 'UTC-2.5' => 'UTC-2:30', 'UTC-2' => 'UTC-2', 'UTC-1.5' => 'UTC-1:30', 'UTC-1' => 'UTC-1', 'UTC-0.5' => 'UTC-0:30', 'UTC' => 'UTC', 'UTC+0.5' => 'UTC+0:30', 'UTC+1' => 'UTC+1', 'UTC+1.5' => 'UTC+1:30', 'UTC+2' => 'UTC+2', 'UTC+2.5' => 'UTC+2:30', 'UTC+3' => 'UTC+3', 'UTC+3.5' => 'UTC+3:30', 'UTC+4' => 'UTC+4', 'UTC+4.5' => 'UTC+4:30', 'UTC+5' => 'UTC+5', 'UTC+5.5' => 'UTC+5:30', 'UTC+5.75' => 'UTC+5:45', 'UTC+6' => 'UTC+6', 'UTC+6.5' => 'UTC+6:30', 'UTC+7' => 'UTC+7', 'UTC+7.5' => 'UTC+7:30', 'UTC+8' => 'UTC+8', 'UTC+8.5' => 'UTC+8:30', 'UTC+8.75' => 'UTC+8:45', 'UTC+9' => 'UTC+9', 'UTC+9.5' => 'UTC+9:30', 'UTC+10' => 'UTC+10', 'UTC+10.5' => 'UTC+10:30', 'UTC+11' => 'UTC+11', 'UTC+11.5' => 'UTC+11:30', 'UTC+12' => 'UTC+12', 'UTC+12.75' => 'UTC+12:45', 'UTC+13' => 'UTC+13', 'UTC+13.75' => 'UTC+13:45', 'UTC+14' => 'UTC+14', ), );