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<?php $supported = timezone_identifiers_list(); $all = timezone_identifiers_list(DateTimeZone::ALL_WITH_BC); var_dump(array_diff($all, $supported));
Output for 8.1.23 - 8.1.27, 8.2.10 - 8.2.16, 8.3.0 - 8.3.3
array(178) { [5]=> string(13) "Africa/Asmera" [50]=> string(15) "Africa/Timbuktu" [61]=> string(32) "America/Argentina/ComodRivadavia" [75]=> string(12) "America/Atka" [85]=> string(20) "America/Buenos_Aires" [90]=> string(17) "America/Catamarca" [96]=> string(21) "America/Coral_Harbour" [97]=> string(15) "America/Cordoba" [111]=> string(16) "America/Ensenada" [113]=> string(18) "America/Fort_Wayne" [116]=> string(15) "America/Godthab" [135]=> string(20) "America/Indianapolis" [139]=> string(13) "America/Jujuy" [143]=> string(15) "America/Knox_IN" [148]=> string(18) "America/Louisville" [157]=> string(15) "America/Mendoza" [166]=> string(16) "America/Montreal" [170]=> string(15) "America/Nipigon" [179]=> string(19) "America/Pangnirtung" [184]=> string(18) "America/Porto_Acre" [188]=> string(19) "America/Rainy_River" [194]=> string(15) "America/Rosario" [195]=> string(20) "America/Santa_Isabel" [201]=> string(16) "America/Shiprock" [212]=> string(19) "America/Thunder_Bay" [217]=> string(14) "America/Virgin" [221]=> string(19) "America/Yellowknife" [230]=> string(21) "Antarctica/South_Pole" [242]=> string(14) "Asia/Ashkhabad" [252]=> string(13) "Asia/Calcutta" [255]=> string(14) "Asia/Chongqing" [256]=> string(14) "Asia/Chungking" [258]=> string(10) "Asia/Dacca" [266]=> string(11) "Asia/Harbin" [272]=> string(13) "Asia/Istanbul" [279]=> string(12) "Asia/Kashgar" [281]=> string(13) "Asia/Katmandu" [288]=> string(10) "Asia/Macao" [305]=> string(12) "Asia/Rangoon" [307]=> string(11) "Asia/Saigon" [318]=> string(13) "Asia/Tel_Aviv" [319]=> string(11) "Asia/Thimbu" [323]=> string(18) "Asia/Ujung_Pandang" [325]=> string(15) "Asia/Ulan_Bator" [338]=> string(15) "Atlantic/Faeroe" [340]=> string(18) "Atlantic/Jan_Mayen" [346]=> string(13) "Australia/ACT" [350]=> string(18) "Australia/Canberra" [351]=> string(16) "Australia/Currie" [355]=> string(13) "Australia/LHI" [359]=> string(15) "Australia/North" [360]=> string(13) "Australia/NSW" [362]=> string(20) "Australia/Queensland" [363]=> string(15) "Australia/South" [365]=> string(18) "Australia/Tasmania" [366]=> string(18) "Australia/Victoria" [367]=> string(14) "Australia/West" [368]=> string(20) "Australia/Yancowinna" [369]=> string(11) "Brazil/Acre" [370]=> string(16) "Brazil/DeNoronha" [371]=> string(11) "Brazil/East" [372]=> string(11) "Brazil/West" [373]=> string(15) "Canada/Atlantic" [374]=> string(14) "Canada/Central" [375]=> string(14) "Canada/Eastern" [376]=> string(15) "Canada/Mountain" [377]=> string(19) "Canada/Newfoundland" [378]=> string(14) "Canada/Pacific" [379]=> string(19) "Canada/Saskatchewan" [380]=> string(12) "Canada/Yukon" [381]=> string(3) "CET" [382]=> string(17) "Chile/Continental" [383]=> string(18) "Chile/EasterIsland" [384]=> string(7) "CST6CDT" [385]=> string(4) "Cuba" [386]=> string(3) "EET" [387]=> string(5) "Egypt" [388]=> string(4) "Eire" [389]=> string(3) "EST" [390]=> string(7) "EST5EDT" [391]=> string(7) "Etc/GMT" [392]=> string(9) "Etc/GMT+0" [393]=> string(9) "Etc/GMT+1" [394]=> string(10) "Etc/GMT+10" [395]=> string(10) "Etc/GMT+11" [396]=> string(10) "Etc/GMT+12" [397]=> string(9) "Etc/GMT+2" [398]=> string(9) "Etc/GMT+3" [399]=> string(9) "Etc/GMT+4" [400]=> string(9) "Etc/GMT+5" [401]=> string(9) "Etc/GMT+6" [402]=> string(9) "Etc/GMT+7" [403]=> string(9) "Etc/GMT+8" [404]=> string(9) "Etc/GMT+9" [405]=> string(9) "Etc/GMT-0" [406]=> string(9) "Etc/GMT-1" [407]=> string(10) "Etc/GMT-10" [408]=> string(10) "Etc/GMT-11" [409]=> string(10) "Etc/GMT-12" [410]=> string(10) "Etc/GMT-13" [411]=> string(10) "Etc/GMT-14" [412]=> string(9) "Etc/GMT-2" [413]=> string(9) "Etc/GMT-3" [414]=> string(9) "Etc/GMT-4" [415]=> string(9) "Etc/GMT-5" [416]=> string(9) "Etc/GMT-6" [417]=> string(9) "Etc/GMT-7" [418]=> string(9) "Etc/GMT-8" [419]=> string(9) "Etc/GMT-9" [420]=> string(8) "Etc/GMT0" [421]=> string(13) "Etc/Greenwich" [422]=> string(7) "Etc/UCT" [423]=> string(13) "Etc/Universal" [424]=> string(7) "Etc/UTC" [425]=> string(8) "Etc/Zulu" [430]=> string(14) "Europe/Belfast" [448]=> string(11) "Europe/Kiev" [461]=> string(14) "Europe/Nicosia" [478]=> string(15) "Europe/Tiraspol" [480]=> string(15) "Europe/Uzhgorod" [488]=> string(17) "Europe/Zaporozhye" [490]=> string(7) "Factory" [491]=> string(2) "GB" [492]=> string(7) "GB-Eire" [493]=> string(3) "GMT" [494]=> string(5) "GMT+0" [495]=> string(5) "GMT-0" [496]=> string(4) "GMT0" [497]=> string(9) "Greenwich" [498]=> string(8) "Hongkong" [499]=> string(3) "HST" [500]=> string(7) "Iceland" [512]=> string(4) "Iran" [513]=> string(6) "Israel" [514]=> string(7) "Jamaica" [515]=> string(5) "Japan" [516]=> string(9) "Kwajalein" [517]=> string(5) "Libya" [518]=> string(3) "MET" [519]=> string(16) "Mexico/BajaNorte" [520]=> string(14) "Mexico/BajaSur" [521]=> string(14) "Mexico/General" [522]=> string(3) "MST" [523]=> string(7) "MST7MDT" [524]=> string(6) "Navajo" [525]=> string(2) "NZ" [526]=> string(7) "NZ-CHAT" [534]=> string(17) "Pacific/Enderbury" [543]=> string(16) "Pacific/Johnston" [559]=> string(14) "Pacific/Ponape" [563]=> string(13) "Pacific/Samoa" [567]=> string(12) "Pacific/Truk" [570]=> string(11) "Pacific/Yap" [571]=> string(6) "Poland" [572]=> string(8) "Portugal" [573]=> string(3) "PRC" [574]=> string(7) "PST8PDT" [575]=> string(3) "ROC" [576]=> string(3) "ROK" [577]=> string(9) "Singapore" [578]=> string(6) "Turkey" [579]=> string(3) "UCT" [580]=> string(9) "Universal" [581]=> string(9) "US/Alaska" [582]=> string(11) "US/Aleutian" [583]=> string(10) "US/Arizona" [584]=> string(10) "US/Central" [585]=> string(15) "US/East-Indiana" [586]=> string(10) "US/Eastern" [587]=> string(9) "US/Hawaii" [588]=> string(17) "US/Indiana-Starke" [589]=> string(11) "US/Michigan" [590]=> string(11) "US/Mountain" [591]=> string(10) "US/Pacific" [592]=> string(8) "US/Samoa" [594]=> string(4) "W-SU" [595]=> string(3) "WET" [596]=> string(4) "Zulu" }
Output for 5.6.20
array(167) { [5]=> string(13) "Africa/Asmera" [50]=> string(15) "Africa/Timbuktu" [61]=> string(32) "America/Argentina/ComodRivadavia" [75]=> string(12) "America/Atka" [85]=> string(20) "America/Buenos_Aires" [90]=> string(17) "America/Catamarca" [95]=> string(21) "America/Coral_Harbour" [96]=> string(15) "America/Cordoba" [110]=> string(16) "America/Ensenada" [112]=> string(18) "America/Fort_Wayne" [134]=> string(20) "America/Indianapolis" [138]=> string(13) "America/Jujuy" [142]=> string(15) "America/Knox_IN" [147]=> string(18) "America/Louisville" [156]=> string(15) "America/Mendoza" [165]=> string(16) "America/Montreal" [182]=> string(18) "America/Porto_Acre" [191]=> string(15) "America/Rosario" [192]=> string(20) "America/Santa_Isabel" [198]=> string(16) "America/Shiprock" [214]=> string(14) "America/Virgin" [227]=> string(21) "Antarctica/South_Pole" [239]=> string(14) "Asia/Ashkhabad" [248]=> string(13) "Asia/Calcutta" [251]=> string(14) "Asia/Chongqing" [252]=> string(14) "Asia/Chungking" [254]=> string(10) "Asia/Dacca" [261]=> string(11) "Asia/Harbin" [267]=> string(13) "Asia/Istanbul" [274]=> string(12) "Asia/Kashgar" [276]=> string(13) "Asia/Katmandu" [283]=> string(10) "Asia/Macao" [301]=> string(11) "Asia/Saigon" [312]=> string(13) "Asia/Tel_Aviv" [313]=> string(11) "Asia/Thimbu" [316]=> string(18) "Asia/Ujung_Pandang" [318]=> string(15) "Asia/Ulan_Bator" [330]=> string(15) "Atlantic/Faeroe" [332]=> string(18) "Atlantic/Jan_Mayen" [338]=> string(13) "Australia/ACT" [342]=> string(18) "Australia/Canberra" [347]=> string(13) "Australia/LHI" [351]=> string(15) "Australia/North" [352]=> string(13) "Australia/NSW" [354]=> string(20) "Australia/Queensland" [355]=> string(15) "Australia/South" [357]=> string(18) "Australia/Tasmania" [358]=> string(18) "Australia/Victoria" [359]=> string(14) "Australia/West" [360]=> string(20) "Australia/Yancowinna" [361]=> string(11) "Brazil/Acre" [362]=> string(16) "Brazil/DeNoronha" [363]=> string(11) "Brazil/East" [364]=> string(11) "Brazil/West" [365]=> string(15) "Canada/Atlantic" [366]=> string(14) "Canada/Central" [367]=> string(24) "Canada/East-Saskatchewan" [368]=> string(14) "Canada/Eastern" [369]=> string(15) "Canada/Mountain" [370]=> string(19) "Canada/Newfoundland" [371]=> string(14) "Canada/Pacific" [372]=> string(19) "Canada/Saskatchewan" [373]=> string(12) "Canada/Yukon" [374]=> string(3) "CET" [375]=> string(17) "Chile/Continental" [376]=> string(18) "Chile/EasterIsland" [377]=> string(7) "CST6CDT" [378]=> string(4) "Cuba" [379]=> string(3) "EET" [380]=> string(5) "Egypt" [381]=> string(4) "Eire" [382]=> string(3) "EST" [383]=> string(7) "EST5EDT" [384]=> string(7) "Etc/GMT" [385]=> string(9) "Etc/GMT+0" [386]=> string(9) "Etc/GMT+1" [387]=> string(10) "Etc/GMT+10" [388]=> string(10) "Etc/GMT+11" [389]=> string(10) "Etc/GMT+12" [390]=> string(9) "Etc/GMT+2" [391]=> string(9) "Etc/GMT+3" [392]=> string(9) "Etc/GMT+4" [393]=> string(9) "Etc/GMT+5" [394]=> string(9) "Etc/GMT+6" [395]=> string(9) "Etc/GMT+7" [396]=> string(9) "Etc/GMT+8" [397]=> string(9) "Etc/GMT+9" [398]=> string(9) "Etc/GMT-0" [399]=> string(9) "Etc/GMT-1" [400]=> string(10) "Etc/GMT-10" [401]=> string(10) "Etc/GMT-11" [402]=> string(10) "Etc/GMT-12" [403]=> string(10) "Etc/GMT-13" [404]=> string(10) "Etc/GMT-14" [405]=> string(9) "Etc/GMT-2" [406]=> string(9) "Etc/GMT-3" [407]=> string(9) "Etc/GMT-4" [408]=> string(9) "Etc/GMT-5" [409]=> string(9) "Etc/GMT-6" [410]=> string(9) "Etc/GMT-7" [411]=> string(9) "Etc/GMT-8" [412]=> string(9) "Etc/GMT-9" [413]=> string(8) "Etc/GMT0" [414]=> string(13) "Etc/Greenwich" [415]=> string(7) "Etc/UCT" [416]=> string(13) "Etc/Universal" [417]=> string(7) "Etc/UTC" [418]=> string(8) "Etc/Zulu" [423]=> string(14) "Europe/Belfast" [452]=> string(14) "Europe/Nicosia" [468]=> string(15) "Europe/Tiraspol" [480]=> string(7) "Factory" [481]=> string(2) "GB" [482]=> string(7) "GB-Eire" [483]=> string(3) "GMT" [484]=> string(5) "GMT+0" [485]=> string(5) "GMT-0" [486]=> string(4) "GMT0" [487]=> string(9) "Greenwich" [488]=> string(8) "Hongkong" [489]=> string(3) "HST" [490]=> string(7) "Iceland" [502]=> string(4) "Iran" [503]=> string(6) "Israel" [504]=> string(7) "Jamaica" [505]=> string(5) "Japan" [506]=> string(9) "Kwajalein" [507]=> string(5) "Libya" [508]=> string(3) "MET" [509]=> string(16) "Mexico/BajaNorte" [510]=> string(14) "Mexico/BajaSur" [511]=> string(14) "Mexico/General" [512]=> string(3) "MST" [513]=> string(7) "MST7MDT" [514]=> string(6) "Navajo" [515]=> string(2) "NZ" [516]=> string(7) "NZ-CHAT" [548]=> string(14) "Pacific/Ponape" [552]=> string(13) "Pacific/Samoa" [556]=> string(12) "Pacific/Truk" [559]=> string(11) "Pacific/Yap" [560]=> string(6) "Poland" [561]=> string(8) "Portugal" [562]=> string(3) "PRC" [563]=> string(7) "PST8PDT" [564]=> string(3) "ROC" [565]=> string(3) "ROK" [566]=> string(9) "Singapore" [567]=> string(6) "Turkey" [568]=> string(3) "UCT" [569]=> string(9) "Universal" [570]=> string(9) "US/Alaska" [571]=> string(11) "US/Aleutian" [572]=> string(10) "US/Arizona" [573]=> string(10) "US/Central" [574]=> string(15) "US/East-Indiana" [575]=> string(10) "US/Eastern" [576]=> string(9) "US/Hawaii" [577]=> string(17) "US/Indiana-Starke" [578]=> string(11) "US/Michigan" [579]=> string(11) "US/Mountain" [580]=> string(10) "US/Pacific" [581]=> string(14) "US/Pacific-New" [582]=> string(8) "US/Samoa" [584]=> string(4) "W-SU" [585]=> string(3) "WET" [586]=> string(4) "Zulu" }

preferences:
65.82 ms | 413 KiB | 22 Q