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<?php print_r(timezone_identifiers_list());
Output for 7.0.18
Array ( [0] => Africa/Abidjan [1] => Africa/Accra [2] => Africa/Addis_Ababa [3] => Africa/Algiers [4] => Africa/Asmara [5] => Africa/Bamako [6] => Africa/Bangui [7] => Africa/Banjul [8] => Africa/Bissau [9] => Africa/Blantyre [10] => Africa/Brazzaville [11] => Africa/Bujumbura [12] => Africa/Cairo [13] => Africa/Casablanca [14] => Africa/Ceuta [15] => Africa/Conakry [16] => Africa/Dakar [17] => Africa/Dar_es_Salaam [18] => Africa/Djibouti [19] => Africa/Douala [20] => Africa/El_Aaiun [21] => Africa/Freetown [22] => Africa/Gaborone [23] => Africa/Harare [24] => Africa/Johannesburg [25] => Africa/Juba [26] => Africa/Kampala [27] => Africa/Khartoum [28] => Africa/Kigali [29] => Africa/Kinshasa [30] => Africa/Lagos [31] => Africa/Libreville [32] => Africa/Lome [33] => Africa/Luanda [34] => Africa/Lubumbashi [35] => Africa/Lusaka [36] => Africa/Malabo [37] => Africa/Maputo [38] => Africa/Maseru [39] => Africa/Mbabane [40] => Africa/Mogadishu [41] => Africa/Monrovia [42] => Africa/Nairobi [43] => Africa/Ndjamena [44] => Africa/Niamey [45] => Africa/Nouakchott [46] => Africa/Ouagadougou [47] => Africa/Porto-Novo [48] => Africa/Sao_Tome [49] => Africa/Tripoli [50] => Africa/Tunis [51] => Africa/Windhoek [52] => America/Adak [53] => America/Anchorage [54] => America/Anguilla [55] => America/Antigua [56] => America/Araguaina [57] => America/Argentina/Buenos_Aires [58] => America/Argentina/Catamarca [59] => America/Argentina/Cordoba [60] => America/Argentina/Jujuy [61] => America/Argentina/La_Rioja [62] => America/Argentina/Mendoza [63] => America/Argentina/Rio_Gallegos [64] => America/Argentina/Salta [65] => America/Argentina/San_Juan [66] => America/Argentina/San_Luis [67] => America/Argentina/Tucuman [68] => America/Argentina/Ushuaia [69] => America/Aruba [70] => America/Asuncion [71] => America/Atikokan [72] => America/Bahia [73] => America/Bahia_Banderas [74] => America/Barbados [75] => America/Belem [76] => America/Belize [77] => America/Blanc-Sablon [78] => America/Boa_Vista [79] => America/Bogota [80] => America/Boise [81] => America/Cambridge_Bay [82] => America/Campo_Grande [83] => America/Cancun [84] => America/Caracas [85] => America/Cayenne [86] => America/Cayman [87] => America/Chicago [88] => America/Chihuahua [89] => America/Costa_Rica [90] => America/Creston [91] => America/Cuiaba [92] => America/Curacao [93] => America/Danmarkshavn [94] => America/Dawson [95] => America/Dawson_Creek [96] => America/Denver [97] => America/Detroit [98] => America/Dominica [99] => America/Edmonton [100] => America/Eirunepe [101] => America/El_Salvador [102] => America/Fort_Nelson [103] => America/Fortaleza [104] => America/Glace_Bay [105] => America/Godthab [106] => America/Goose_Bay [107] => America/Grand_Turk [108] => America/Grenada [109] => America/Guadeloupe [110] => America/Guatemala [111] => America/Guayaquil [112] => America/Guyana [113] => America/Halifax [114] => America/Havana [115] => America/Hermosillo [116] => America/Indiana/Indianapolis [117] => America/Indiana/Knox [118] => America/Indiana/Marengo [119] => America/Indiana/Petersburg [120] => America/Indiana/Tell_City [121] => America/Indiana/Vevay [122] => America/Indiana/Vincennes [123] => America/Indiana/Winamac [124] => America/Inuvik [125] => America/Iqaluit [126] => America/Jamaica [127] => America/Juneau [128] => America/Kentucky/Louisville [129] => America/Kentucky/Monticello [130] => America/Kralendijk [131] => America/La_Paz [132] => America/Lima [133] => America/Los_Angeles [134] => America/Lower_Princes [135] => America/Maceio [136] => America/Managua [137] => America/Manaus [138] => America/Marigot [139] => America/Martinique [140] => America/Matamoros [141] => America/Mazatlan [142] => America/Menominee [143] => America/Merida [144] => America/Metlakatla [145] => America/Mexico_City [146] => America/Miquelon [147] => America/Moncton [148] => America/Monterrey [149] => America/Montevideo [150] => America/Montserrat [151] => America/Nassau [152] => America/New_York [153] => America/Nipigon [154] => America/Nome [155] => America/Noronha [156] => America/North_Dakota/Beulah [157] => America/North_Dakota/Center [158] => America/North_Dakota/New_Salem [159] => America/Ojinaga [160] => America/Panama [161] => America/Pangnirtung [162] => America/Paramaribo [163] => America/Phoenix [164] => America/Port-au-Prince [165] => America/Port_of_Spain [166] => America/Porto_Velho [167] => America/Puerto_Rico [168] => America/Punta_Arenas [169] => America/Rainy_River [170] => America/Rankin_Inlet [171] => America/Recife [172] => America/Regina [173] => America/Resolute [174] => America/Rio_Branco [175] => America/Santarem [176] => America/Santiago [177] => America/Santo_Domingo [178] => America/Sao_Paulo [179] => America/Scoresbysund [180] => America/Sitka [181] => America/St_Barthelemy [182] => America/St_Johns [183] => America/St_Kitts [184] => America/St_Lucia [185] => America/St_Thomas [186] => America/St_Vincent [187] => America/Swift_Current [188] => America/Tegucigalpa [189] => America/Thule [190] => America/Thunder_Bay [191] => America/Tijuana [192] => America/Toronto [193] => America/Tortola [194] => America/Vancouver [195] => America/Whitehorse [196] => America/Winnipeg [197] => America/Yakutat [198] => America/Yellowknife [199] => Antarctica/Casey [200] => Antarctica/Davis [201] => Antarctica/DumontDUrville [202] => Antarctica/Macquarie [203] => Antarctica/Mawson [204] => Antarctica/McMurdo [205] => Antarctica/Palmer [206] => Antarctica/Rothera [207] => Antarctica/Syowa [208] => Antarctica/Troll [209] => Antarctica/Vostok [210] => Arctic/Longyearbyen [211] => Asia/Aden [212] => Asia/Almaty [213] => Asia/Amman [214] => Asia/Anadyr [215] => Asia/Aqtau [216] => Asia/Aqtobe [217] => Asia/Ashgabat [218] => Asia/Atyrau [219] => Asia/Baghdad [220] => Asia/Bahrain [221] => Asia/Baku [222] => Asia/Bangkok [223] => Asia/Barnaul [224] => Asia/Beirut [225] => Asia/Bishkek [226] => Asia/Brunei [227] => Asia/Chita [228] => Asia/Choibalsan [229] => Asia/Colombo [230] => Asia/Damascus [231] => Asia/Dhaka [232] => Asia/Dili [233] => Asia/Dubai [234] => Asia/Dushanbe [235] => Asia/Famagusta [236] => Asia/Gaza [237] => Asia/Hebron [238] => Asia/Ho_Chi_Minh [239] => Asia/Hong_Kong [240] => Asia/Hovd [241] => Asia/Irkutsk [242] => Asia/Jakarta [243] => Asia/Jayapura [244] => Asia/Jerusalem [245] => Asia/Kabul [246] => Asia/Kamchatka [247] => Asia/Karachi [248] => Asia/Kathmandu [249] => Asia/Khandyga [250] => Asia/Kolkata [251] => Asia/Krasnoyarsk [252] => Asia/Kuala_Lumpur [253] => Asia/Kuching [254] => Asia/Kuwait [255] => Asia/Macau [256] => Asia/Magadan [257] => Asia/Makassar [258] => Asia/Manila [259] => Asia/Muscat [260] => Asia/Nicosia [261] => Asia/Novokuznetsk [262] => Asia/Novosibirsk [263] => Asia/Omsk [264] => Asia/Oral [265] => Asia/Phnom_Penh [266] => Asia/Pontianak [267] => Asia/Pyongyang [268] => Asia/Qatar [269] => Asia/Qyzylorda [270] => Asia/Riyadh [271] => Asia/Sakhalin [272] => Asia/Samarkand [273] => Asia/Seoul [274] => Asia/Shanghai [275] => Asia/Singapore [276] => Asia/Srednekolymsk [277] => Asia/Taipei [278] => Asia/Tashkent [279] => Asia/Tbilisi [280] => Asia/Tehran [281] => Asia/Thimphu [282] => Asia/Tokyo [283] => Asia/Tomsk [284] => Asia/Ulaanbaatar [285] => Asia/Urumqi [286] => Asia/Ust-Nera [287] => Asia/Vientiane [288] => Asia/Vladivostok [289] => Asia/Yakutsk [290] => Asia/Yangon [291] => Asia/Yekaterinburg [292] => Asia/Yerevan [293] => Atlantic/Azores [294] => Atlantic/Bermuda [295] => Atlantic/Canary [296] => Atlantic/Cape_Verde [297] => Atlantic/Faroe [298] => Atlantic/Madeira [299] => Atlantic/Reykjavik [300] => Atlantic/South_Georgia [301] => Atlantic/St_Helena [302] => Atlantic/Stanley [303] => Australia/Adelaide [304] => Australia/Brisbane [305] => Australia/Broken_Hill [306] => Australia/Currie [307] => Australia/Darwin [308] => Australia/Eucla [309] => Australia/Hobart [310] => Australia/Lindeman [311] => Australia/Lord_Howe [312] => Australia/Melbourne [313] => Australia/Perth [314] => Australia/Sydney [315] => Europe/Amsterdam [316] => Europe/Andorra [317] => Europe/Astrakhan [318] => Europe/Athens [319] => Europe/Belgrade [320] => Europe/Berlin [321] => Europe/Bratislava [322] => Europe/Brussels [323] => Europe/Bucharest [324] => Europe/Budapest [325] => Europe/Busingen [326] => Europe/Chisinau [327] => Europe/Copenhagen [328] => Europe/Dublin [329] => Europe/Gibraltar [330] => Europe/Guernsey [331] => Europe/Helsinki [332] => Europe/Isle_of_Man [333] => Europe/Istanbul [334] => Europe/Jersey [335] => Europe/Kaliningrad [336] => Europe/Kiev [337] => Europe/Kirov [338] => Europe/Lisbon [339] => Europe/Ljubljana [340] => Europe/London [341] => Europe/Luxembourg [342] => Europe/Madrid [343] => Europe/Malta [344] => Europe/Mariehamn [345] => Europe/Minsk [346] => Europe/Monaco [347] => Europe/Moscow [348] => Europe/Oslo [349] => Europe/Paris [350] => Europe/Podgorica [351] => Europe/Prague [352] => Europe/Riga [353] => Europe/Rome [354] => Europe/Samara [355] => Europe/San_Marino [356] => Europe/Sarajevo [357] => Europe/Saratov [358] => Europe/Simferopol [359] => Europe/Skopje [360] => Europe/Sofia [361] => Europe/Stockholm [362] => Europe/Tallinn [363] => Europe/Tirane [364] => Europe/Ulyanovsk [365] => Europe/Uzhgorod [366] => Europe/Vaduz [367] => Europe/Vatican [368] => Europe/Vienna [369] => Europe/Vilnius [370] => Europe/Volgograd [371] => Europe/Warsaw [372] => Europe/Zagreb [373] => Europe/Zaporozhye [374] => Europe/Zurich [375] => Indian/Antananarivo [376] => Indian/Chagos [377] => Indian/Christmas [378] => Indian/Cocos [379] => Indian/Comoro [380] => Indian/Kerguelen [381] => Indian/Mahe [382] => Indian/Maldives [383] => Indian/Mauritius [384] => Indian/Mayotte [385] => Indian/Reunion [386] => Pacific/Apia [387] => Pacific/Auckland [388] => Pacific/Bougainville [389] => Pacific/Chatham [390] => Pacific/Chuuk [391] => Pacific/Easter [392] => Pacific/Efate [393] => Pacific/Enderbury [394] => Pacific/Fakaofo [395] => Pacific/Fiji [396] => Pacific/Funafuti [397] => Pacific/Galapagos [398] => Pacific/Gambier [399] => Pacific/Guadalcanal [400] => Pacific/Guam [401] => Pacific/Honolulu [402] => Pacific/Kiritimati [403] => Pacific/Kosrae [404] => Pacific/Kwajalein [405] => Pacific/Majuro [406] => Pacific/Marquesas [407] => Pacific/Midway [408] => Pacific/Nauru [409] => Pacific/Niue [410] => Pacific/Norfolk [411] => Pacific/Noumea [412] => Pacific/Pago_Pago [413] => Pacific/Palau [414] => Pacific/Pitcairn [415] => Pacific/Pohnpei [416] => Pacific/Port_Moresby [417] => Pacific/Rarotonga [418] => Pacific/Saipan [419] => Pacific/Tahiti [420] => Pacific/Tarawa [421] => Pacific/Tongatapu [422] => Pacific/Wake [423] => Pacific/Wallis [424] => UTC )