Setting timezone to UTC (0) in PHP

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南方客
南方客 2020-12-08 03:42

Why does this work?

date_default_timezone_set(\'Australia/Currie\');

But this doesn\'t seem to take any effect at all?

date         


        
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6条回答
  • 2020-12-08 04:21

    Is 'UTC' a valid timezone identifier on your system?

    <?php
    if (date_default_timezone_set('UTC')){
        echo "UTC is a valid time zone";
    }else{
        echo "The system doesn't know WTFUTC.  Maybe try updating tzinfo with your package manager?";
    }
    
    0 讨论(0)
  • 2020-12-08 04:26

    UTC is definitely a valid timezone. It is simply an abbreviation for Coordinated Universal Time. In addition, remember that date_default_timezone_set accepts one of the following values:

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

    Timezones in PHP at http://www.php.net/manual/en/timezones.php

    0 讨论(0)
  • 2020-12-08 04:28

    List of entire available timezones.

    $time_zones = array (
      0 => 'Africa/Abidjan',
      1 => 'Africa/Accra',
      2 => 'Africa/Addis_Ababa',
      3 => 'Africa/Algiers',
      4 => 'Africa/Asmara',
      5 => 'Africa/Asmera',
      6 => 'Africa/Bamako',
      7 => 'Africa/Bangui',
      8 => 'Africa/Banjul',
      9 => 'Africa/Bissau',
      10 => 'Africa/Blantyre',
      11 => 'Africa/Brazzaville',
      12 => 'Africa/Bujumbura',
      13 => 'Africa/Cairo',
      14 => 'Africa/Casablanca',
      15 => 'Africa/Ceuta',
      16 => 'Africa/Conakry',
      17 => 'Africa/Dakar',
      18 => 'Africa/Dar_es_Salaam',
      19 => 'Africa/Djibouti',
      20 => 'Africa/Douala',
      21 => 'Africa/El_Aaiun',
      22 => 'Africa/Freetown',
      23 => 'Africa/Gaborone',
      24 => 'Africa/Harare',
      25 => 'Africa/Johannesburg',
      26 => 'Africa/Juba',
      27 => 'Africa/Kampala',
      28 => 'Africa/Khartoum',
      29 => 'Africa/Kigali',
      30 => 'Africa/Kinshasa',
      31 => 'Africa/Lagos',
      32 => 'Africa/Libreville',
      33 => 'Africa/Lome',
      34 => 'Africa/Luanda',
      35 => 'Africa/Lubumbashi',
      36 => 'Africa/Lusaka',
      37 => 'Africa/Malabo',
      38 => 'Africa/Maputo',
      39 => 'Africa/Maseru',
      40 => 'Africa/Mbabane',
      41 => 'Africa/Mogadishu',
      42 => 'Africa/Monrovia',
      43 => 'Africa/Nairobi',
      44 => 'Africa/Ndjamena',
      45 => 'Africa/Niamey',
      46 => 'Africa/Nouakchott',
      47 => 'Africa/Ouagadougou',
      48 => 'Africa/Porto-Novo',
      49 => 'Africa/Sao_Tome',
      50 => 'Africa/Timbuktu',
      51 => 'Africa/Tripoli',
      52 => 'Africa/Tunis',
      53 => 'Africa/Windhoek',
      54 => 'America/Adak',
      55 => 'America/Anchorage',
      56 => 'America/Anguilla',
      57 => 'America/Antigua',
      58 => 'America/Araguaina',
      59 => 'America/Argentina/Buenos_Aires',
      60 => 'America/Argentina/Catamarca',
      61 => 'America/Argentina/ComodRivadavia',
      62 => 'America/Argentina/Cordoba',
      63 => 'America/Argentina/Jujuy',
      64 => 'America/Argentina/La_Rioja',
      65 => 'America/Argentina/Mendoza',
      66 => 'America/Argentina/Rio_Gallegos',
      67 => 'America/Argentina/Salta',
      68 => 'America/Argentina/San_Juan',
      69 => 'America/Argentina/San_Luis',
      70 => 'America/Argentina/Tucuman',
      71 => 'America/Argentina/Ushuaia',
      72 => 'America/Aruba',
      73 => 'America/Asuncion',
      74 => 'America/Atikokan',
      75 => 'America/Atka',
      76 => 'America/Bahia',
      77 => 'America/Bahia_Banderas',
      78 => 'America/Barbados',
      79 => 'America/Belem',
      80 => 'America/Belize',
      81 => 'America/Blanc-Sablon',
      82 => 'America/Boa_Vista',
      83 => 'America/Bogota',
      84 => 'America/Boise',
      85 => 'America/Buenos_Aires',
      86 => 'America/Cambridge_Bay',
      87 => 'America/Campo_Grande',
      88 => 'America/Cancun',
      89 => 'America/Caracas',
      90 => 'America/Catamarca',
      91 => 'America/Cayenne',
      92 => 'America/Cayman',
      93 => 'America/Chicago',
      94 => 'America/Chihuahua',
      95 => 'America/Coral_Harbour',
      96 => 'America/Cordoba',
      97 => 'America/Costa_Rica',
      98 => 'America/Creston',
      99 => 'America/Cuiaba',
      100 => 'America/Curacao',
      101 => 'America/Danmarkshavn',
      102 => 'America/Dawson',
      103 => 'America/Dawson_Creek',
      104 => 'America/Denver',
      105 => 'America/Detroit',
      106 => 'America/Dominica',
      107 => 'America/Edmonton',
      108 => 'America/Eirunepe',
      109 => 'America/El_Salvador',
      110 => 'America/Ensenada',
      111 => 'America/Fort_Nelson',
      112 => 'America/Fort_Wayne',
      113 => 'America/Fortaleza',
      114 => 'America/Glace_Bay',
      115 => 'America/Godthab',
      116 => 'America/Goose_Bay',
      117 => 'America/Grand_Turk',
      118 => 'America/Grenada',
      119 => 'America/Guadeloupe',
      120 => 'America/Guatemala',
      121 => 'America/Guayaquil',
      122 => 'America/Guyana',
      123 => 'America/Halifax',
      124 => 'America/Havana',
      125 => 'America/Hermosillo',
      126 => 'America/Indiana/Indianapolis',
      127 => 'America/Indiana/Knox',
      128 => 'America/Indiana/Marengo',
      129 => 'America/Indiana/Petersburg',
      130 => 'America/Indiana/Tell_City',
      131 => 'America/Indiana/Vevay',
      132 => 'America/Indiana/Vincennes',
      133 => 'America/Indiana/Winamac',
      134 => 'America/Indianapolis',
      135 => 'America/Inuvik',
      136 => 'America/Iqaluit',
      137 => 'America/Jamaica',
      138 => 'America/Jujuy',
      139 => 'America/Juneau',
      140 => 'America/Kentucky/Louisville',
      141 => 'America/Kentucky/Monticello',
      142 => 'America/Knox_IN',
      143 => 'America/Kralendijk',
      144 => 'America/La_Paz',
      145 => 'America/Lima',
      146 => 'America/Los_Angeles',
      147 => 'America/Louisville',
      148 => 'America/Lower_Princes',
      149 => 'America/Maceio',
      150 => 'America/Managua',
      151 => 'America/Manaus',
      152 => 'America/Marigot',
      153 => 'America/Martinique',
      154 => 'America/Matamoros',
      155 => 'America/Mazatlan',
      156 => 'America/Mendoza',
      157 => 'America/Menominee',
      158 => 'America/Merida',
      159 => 'America/Metlakatla',
      160 => 'America/Mexico_City',
      161 => 'America/Miquelon',
      162 => 'America/Moncton',
      163 => 'America/Monterrey',
      164 => 'America/Montevideo',
      165 => 'America/Montreal',
      166 => 'America/Montserrat',
      167 => 'America/Nassau',
      168 => 'America/New_York',
      169 => 'America/Nipigon',
      170 => 'America/Nome',
      171 => 'America/Noronha',
      172 => 'America/North_Dakota/Beulah',
      173 => 'America/North_Dakota/Center',
      174 => 'America/North_Dakota/New_Salem',
      175 => 'America/Ojinaga',
      176 => 'America/Panama',
      177 => 'America/Pangnirtung',
      178 => 'America/Paramaribo',
      179 => 'America/Phoenix',
      180 => 'America/Port-au-Prince',
      181 => 'America/Port_of_Spain',
      182 => 'America/Porto_Acre',
      183 => 'America/Porto_Velho',
      184 => 'America/Puerto_Rico',
      185 => 'America/Rainy_River',
      186 => 'America/Rankin_Inlet',
      187 => 'America/Recife',
      188 => 'America/Regina',
      189 => 'America/Resolute',
      190 => 'America/Rio_Branco',
      191 => 'America/Rosario',
      192 => 'America/Santa_Isabel',
      193 => 'America/Santarem',
      194 => 'America/Santiago',
      195 => 'America/Santo_Domingo',
      196 => 'America/Sao_Paulo',
      197 => 'America/Scoresbysund',
      198 => 'America/Shiprock',
      199 => 'America/Sitka',
      200 => 'America/St_Barthelemy',
      201 => 'America/St_Johns',
      202 => 'America/St_Kitts',
      203 => 'America/St_Lucia',
      204 => 'America/St_Thomas',
      205 => 'America/St_Vincent',
      206 => 'America/Swift_Current',
      207 => 'America/Tegucigalpa',
      208 => 'America/Thule',
      209 => 'America/Thunder_Bay',
      210 => 'America/Tijuana',
      211 => 'America/Toronto',
      212 => 'America/Tortola',
      213 => 'America/Vancouver',
      214 => 'America/Virgin',
      215 => 'America/Whitehorse',
      216 => 'America/Winnipeg',
      217 => 'America/Yakutat',
      218 => 'America/Yellowknife',
      219 => 'Antarctica/Casey',
      220 => 'Antarctica/Davis',
      221 => 'Antarctica/DumontDUrville',
      222 => 'Antarctica/Macquarie',
      223 => 'Antarctica/Mawson',
      224 => 'Antarctica/McMurdo',
      225 => 'Antarctica/Palmer',
      226 => 'Antarctica/Rothera',
      227 => 'Antarctica/South_Pole',
      228 => 'Antarctica/Syowa',
      229 => 'Antarctica/Troll',
      230 => 'Antarctica/Vostok',
      231 => 'Arctic/Longyearbyen',
      232 => 'Asia/Aden',
      233 => 'Asia/Almaty',
      234 => 'Asia/Amman',
      235 => 'Asia/Anadyr',
      236 => 'Asia/Aqtau',
      237 => 'Asia/Aqtobe',
      238 => 'Asia/Ashgabat',
      239 => 'Asia/Ashkhabad',
      240 => 'Asia/Baghdad',
      241 => 'Asia/Bahrain',
      242 => 'Asia/Baku',
      243 => 'Asia/Bangkok',
      244 => 'Asia/Beirut',
      245 => 'Asia/Bishkek',
      246 => 'Asia/Brunei',
      247 => 'Asia/Calcutta',
      248 => 'Asia/Chita',
      249 => 'Asia/Choibalsan',
      250 => 'Asia/Chongqing',
      251 => 'Asia/Chungking',
      252 => 'Asia/Colombo',
      253 => 'Asia/Dacca',
      254 => 'Asia/Damascus',
      255 => 'Asia/Dhaka',
      256 => 'Asia/Dili',
      257 => 'Asia/Dubai',
      258 => 'Asia/Dushanbe',
      259 => 'Asia/Gaza',
      260 => 'Asia/Harbin',
      261 => 'Asia/Hebron',
      262 => 'Asia/Ho_Chi_Minh',
      263 => 'Asia/Hong_Kong',
      264 => 'Asia/Hovd',
      265 => 'Asia/Irkutsk',
      266 => 'Asia/Istanbul',
      267 => 'Asia/Jakarta',
      268 => 'Asia/Jayapura',
      269 => 'Asia/Jerusalem',
      270 => 'Asia/Kabul',
      271 => 'Asia/Kamchatka',
      272 => 'Asia/Karachi',
      273 => 'Asia/Kashgar',
      274 => 'Asia/Kathmandu',
      275 => 'Asia/Katmandu',
      276 => 'Asia/Khandyga',
      277 => 'Asia/Kolkata',
      278 => 'Asia/Krasnoyarsk',
      279 => 'Asia/Kuala_Lumpur',
      280 => 'Asia/Kuching',
      281 => 'Asia/Kuwait',
      282 => 'Asia/Macao',
      283 => 'Asia/Macau',
      284 => 'Asia/Magadan',
      285 => 'Asia/Makassar',
      286 => 'Asia/Manila',
      287 => 'Asia/Muscat',
      288 => 'Asia/Nicosia',
      289 => 'Asia/Novokuznetsk',
      290 => 'Asia/Novosibirsk',
      291 => 'Asia/Omsk',
      292 => 'Asia/Oral',
      293 => 'Asia/Phnom_Penh',
      294 => 'Asia/Pontianak',
      295 => 'Asia/Pyongyang',
      296 => 'Asia/Qatar',
      297 => 'Asia/Qyzylorda',
      298 => 'Asia/Rangoon',
      299 => 'Asia/Riyadh',
      300 => 'Asia/Saigon',
      301 => 'Asia/Sakhalin',
      302 => 'Asia/Samarkand',
      303 => 'Asia/Seoul',
      304 => 'Asia/Shanghai',
      305 => 'Asia/Singapore',
      306 => 'Asia/Srednekolymsk',
      307 => 'Asia/Taipei',
      308 => 'Asia/Tashkent',
      309 => 'Asia/Tbilisi',
      310 => 'Asia/Tehran',
      311 => 'Asia/Tel_Aviv',
      312 => 'Asia/Thimbu',
      313 => 'Asia/Thimphu',
      314 => 'Asia/Tokyo',
      315 => 'Asia/Ujung_Pandang',
      316 => 'Asia/Ulaanbaatar',
      317 => 'Asia/Ulan_Bator',
      318 => 'Asia/Urumqi',
      319 => 'Asia/Ust-Nera',
      320 => 'Asia/Vientiane',
      321 => 'Asia/Vladivostok',
      322 => 'Asia/Yakutsk',
      323 => 'Asia/Yekaterinburg',
      324 => 'Asia/Yerevan',
      325 => 'Atlantic/Azores',
      326 => 'Atlantic/Bermuda',
      327 => 'Atlantic/Canary',
      328 => 'Atlantic/Cape_Verde',
      329 => 'Atlantic/Faeroe',
      330 => 'Atlantic/Faroe',
      331 => 'Atlantic/Jan_Mayen',
      332 => 'Atlantic/Madeira',
      333 => 'Atlantic/Reykjavik',
      334 => 'Atlantic/South_Georgia',
      335 => 'Atlantic/St_Helena',
      336 => 'Atlantic/Stanley',
      337 => 'Australia/ACT',
      338 => 'Australia/Adelaide',
      339 => 'Australia/Brisbane',
      340 => 'Australia/Broken_Hill',
      341 => 'Australia/Canberra',
      342 => 'Australia/Currie',
      343 => 'Australia/Darwin',
      344 => 'Australia/Eucla',
      345 => 'Australia/Hobart',
      346 => 'Australia/LHI',
      347 => 'Australia/Lindeman',
      348 => 'Australia/Lord_Howe',
      349 => 'Australia/Melbourne',
      350 => 'Australia/North',
      351 => 'Australia/NSW',
      352 => 'Australia/Perth',
      353 => 'Australia/Queensland',
      354 => 'Australia/South',
      355 => 'Australia/Sydney',
      356 => 'Australia/Tasmania',
      357 => 'Australia/Victoria',
      358 => 'Australia/West',
      359 => 'Australia/Yancowinna',
      360 => 'Europe/Amsterdam',
      361 => 'Europe/Andorra',
      362 => 'Europe/Athens',
      363 => 'Europe/Belfast',
      364 => 'Europe/Belgrade',
      365 => 'Europe/Berlin',
      366 => 'Europe/Bratislava',
      367 => 'Europe/Brussels',
      368 => 'Europe/Bucharest',
      369 => 'Europe/Budapest',
      370 => 'Europe/Busingen',
      371 => 'Europe/Chisinau',
      372 => 'Europe/Copenhagen',
      373 => 'Europe/Dublin',
      374 => 'Europe/Gibraltar',
      375 => 'Europe/Guernsey',
      376 => 'Europe/Helsinki',
      377 => 'Europe/Isle_of_Man',
      378 => 'Europe/Istanbul',
      379 => 'Europe/Jersey',
      380 => 'Europe/Kaliningrad',
      381 => 'Europe/Kiev',
      382 => 'Europe/Lisbon',
      383 => 'Europe/Ljubljana',
      384 => 'Europe/London',
      385 => 'Europe/Luxembourg',
      386 => 'Europe/Madrid',
      387 => 'Europe/Malta',
      388 => 'Europe/Mariehamn',
      389 => 'Europe/Minsk',
      390 => 'Europe/Monaco',
      391 => 'Europe/Moscow',
      392 => 'Europe/Nicosia',
      393 => 'Europe/Oslo',
      394 => 'Europe/Paris',
      395 => 'Europe/Podgorica',
      396 => 'Europe/Prague',
      397 => 'Europe/Riga',
      398 => 'Europe/Rome',
      399 => 'Europe/Samara',
      400 => 'Europe/San_Marino',
      401 => 'Europe/Sarajevo',
      402 => 'Europe/Simferopol',
      403 => 'Europe/Skopje',
      404 => 'Europe/Sofia',
      405 => 'Europe/Stockholm',
      406 => 'Europe/Tallinn',
      407 => 'Europe/Tirane',
      408 => 'Europe/Tiraspol',
      409 => 'Europe/Uzhgorod',
      410 => 'Europe/Vaduz',
      411 => 'Europe/Vatican',
      412 => 'Europe/Vienna',
      413 => 'Europe/Vilnius',
      414 => 'Europe/Volgograd',
      415 => 'Europe/Warsaw',
      416 => 'Europe/Zagreb',
      417 => 'Europe/Zaporozhye',
      418 => 'Europe/Zurich',
      419 => 'Indian/Antananarivo',
      420 => 'Indian/Chagos',
      421 => 'Indian/Christmas',
      422 => 'Indian/Cocos',
      423 => 'Indian/Comoro',
      424 => 'Indian/Kerguelen',
      425 => 'Indian/Mahe',
      426 => 'Indian/Maldives',
      427 => 'Indian/Mauritius',
      428 => 'Indian/Mayotte',
      429 => 'Indian/Reunion',
      430 => 'Pacific/Apia',
      431 => 'Pacific/Auckland',
      432 => 'Pacific/Bougainville',
      433 => 'Pacific/Chatham',
      434 => 'Pacific/Chuuk',
      435 => 'Pacific/Easter',
      436 => 'Pacific/Efate',
      437 => 'Pacific/Enderbury',
      438 => 'Pacific/Fakaofo',
      439 => 'Pacific/Fiji',
      440 => 'Pacific/Funafuti',
      441 => 'Pacific/Galapagos',
      442 => 'Pacific/Gambier',
      443 => 'Pacific/Guadalcanal',
      444 => 'Pacific/Guam',
      445 => 'Pacific/Honolulu',
      446 => 'Pacific/Johnston',
      447 => 'Pacific/Kiritimati',
      448 => 'Pacific/Kosrae',
      449 => 'Pacific/Kwajalein',
      450 => 'Pacific/Majuro',
      451 => 'Pacific/Marquesas',
      452 => 'Pacific/Midway',
      453 => 'Pacific/Nauru',
      454 => 'Pacific/Niue',
      455 => 'Pacific/Norfolk',
      456 => 'Pacific/Noumea',
      457 => 'Pacific/Pago_Pago',
      458 => 'Pacific/Palau',
      459 => 'Pacific/Pitcairn',
      460 => 'Pacific/Pohnpei',
      461 => 'Pacific/Ponape',
      462 => 'Pacific/Port_Moresby',
      463 => 'Pacific/Rarotonga',
      464 => 'Pacific/Saipan',
      465 => 'Pacific/Samoa',
      466 => 'Pacific/Tahiti',
      467 => 'Pacific/Tarawa',
      468 => 'Pacific/Tongatapu',
      469 => 'Pacific/Truk',
      470 => 'Pacific/Wake',
      471 => 'Pacific/Wallis',
      472 => 'Pacific/Yap',
      473 => 'Brazil/Acre',
      474 => 'Brazil/DeNoronha',
      475 => 'Brazil/East',
      476 => 'Brazil/West',
      477 => 'Canada/Atlantic',
      478 => 'Canada/Central',
      479 => 'Canada/East-Saskatchewan',
      480 => 'Canada/Eastern',
      481 => 'Canada/Mountain',
      482 => 'Canada/Newfoundland',
      483 => 'Canada/Pacific',
      484 => 'Canada/Saskatchewan',
      485 => 'Canada/Yukon',
      486 => 'CET',
      487 => 'Chile/Continental',
      488 => 'Chile/EasterIsland',
      489 => 'CST6CDT',
      490 => 'Cuba',
      491 => 'EET',
      492 => 'Egypt',
      493 => 'Eire',
      494 => 'EST',
      495 => 'EST5EDT',
      496 => 'Etc/GMT',
      497 => 'Etc/GMT+0',
      498 => 'Etc/GMT+1',
      499 => 'Etc/GMT+10',
      500 => 'Etc/GMT+11',
      501 => 'Etc/GMT+12',
      502 => 'Etc/GMT+2',
      503 => 'Etc/GMT+3',
      504 => 'Etc/GMT+4',
      505 => 'Etc/GMT+5',
      506 => 'Etc/GMT+6',
      507 => 'Etc/GMT+7',
      508 => 'Etc/GMT+8',
      509 => 'Etc/GMT+9',
      510 => 'Etc/GMT-0',
      511 => 'Etc/GMT-1',
      512 => 'Etc/GMT-10',
      513 => 'Etc/GMT-11',
      514 => 'Etc/GMT-12',
      515 => 'Etc/GMT-13',
      516 => 'Etc/GMT-14',
      517 => 'Etc/GMT-2',
      518 => 'Etc/GMT-3',
      519 => 'Etc/GMT-4',
      520 => 'Etc/GMT-5',
      521 => 'Etc/GMT-6',
      522 => 'Etc/GMT-7',
      523 => 'Etc/GMT-8',
      524 => 'Etc/GMT-9',
      525 => 'Etc/GMT0',
      526 => 'Etc/Greenwich',
      527 => 'Etc/UCT',
      528 => 'Etc/Universal',
      529 => 'Etc/UTC',
      530 => 'Etc/Zulu',
      531 => 'Factory',
      532 => 'GB',
      533 => 'GB-Eire',
      534 => 'GMT',
      535 => 'GMT+0',
      536 => 'GMT-0',
      537 => 'GMT0',
      538 => 'Greenwich',
      539 => 'Hongkong',
      540 => 'HST',
      541 => 'Iceland',
      542 => 'Iran',
      543 => 'Israel',
      544 => 'Jamaica',
      545 => 'Japan',
      546 => 'Kwajalein',
      547 => 'Libya',
      548 => 'MET',
      549 => 'Mexico/BajaNorte',
      550 => 'Mexico/BajaSur',
      551 => 'Mexico/General',
      552 => 'MST',
      553 => 'MST7MDT',
      554 => 'Navajo',
      555 => 'NZ',
      556 => 'NZ-CHAT',
      557 => 'Poland',
      558 => 'Portugal',
      559 => 'PRC',
      560 => 'PST8PDT',
      561 => 'ROC',
      562 => 'ROK',
      563 => 'Singapore',
      564 => 'Turkey',
      565 => 'UCT',
      566 => 'Universal',
      567 => 'US/Alaska',
      568 => 'US/Aleutian',
      569 => 'US/Arizona',
      570 => 'US/Central',
      571 => 'US/East-Indiana',
      572 => 'US/Eastern',
      573 => 'US/Hawaii',
      574 => 'US/Indiana-Starke',
      575 => 'US/Michigan',
      576 => 'US/Mountain',
      577 => 'US/Pacific',
      578 => 'US/Pacific-New',
      579 => 'US/Samoa',
      580 => 'UTC',
      581 => 'W-SU',
      582 => 'WET',
      583 => 'Zulu',
    )
    
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  • 2020-12-08 04:31

    You can always check this maintained list to timezones

    https://www.php.net/manual/en/function.date.php

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  • 2020-12-08 04:32

    The problem is that you're displaying time(), which is a UNIX timestamp based on GMT/UTC. That’s why it doesn’t change. date() on the other hand, formats the time based on that timestamp.

    A timestamp is the number of seconds since the Unix Epoch (January 1 1970 00:00:00 GMT).

    echo date('Y-m-d H:i:s T', time()) . "<br>\n";
    date_default_timezone_set('UTC');
    echo date('Y-m-d H:i:s T', time()) . "<br>\n";
    
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  • 2020-12-08 04:37

    In PHP DateTime (PHP >= 5.3)

    $dt = new DateTime();
    $dt->setTimezone(new DateTimeZone('UTC'));
    echo $dt->getTimestamp();
    
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