Answer by Kamlesh for PHP Timezone List

$america_timezones_list = array('+00:00' => '(+00:00) Danmarkshavn','-01:00' => '(-01:00) Scoresbysund','-02:00' => '(-02:00) Noronha','-03:00' => '(-03:00) Montevideo','-03:00' => '(-03:00) Cayenne','-03:00' => '(-03:00) Paramaribo','-03:00' => '(-03:00) Miquelon','-03:00' => '(-03:00) Araguaina','-03:00' => '(-03:00) Santiago','-03:00' => '(-03:00) Punta Arenas','-03:00' => '(-03:00) Argentina/Buenos Aires','-03:00' => '(-03:00) Argentina/Catamarca','-03:00' => '(-03:00) Argentina/Mendoza','-03:00' => '(-03:00) Argentina/San Luis','-03:00' => '(-03:00) Argentina/San Juan','-03:00' => '(-03:00) Argentina/La Rioja','-03:00' => '(-03:00) Sao Paulo','-03:00' => '(-03:00) Asuncion','-03:00' => '(-03:00) Godthab','-03:00' => '(-03:00) Bahia','-03:00' => '(-03:00) Argentina/Rio Gallegos','-03:00' => '(-03:00) Argentina/Jujuy','-03:00' => '(-03:00) Argentina/Tucuman','-03:00' => '(-03:00) Belem','-03:00' => '(-03:00) Recife','-03:00' => '(-03:00) Fortaleza','-03:00' => '(-03:00) Santarem','-03:00' => '(-03:00) Argentina/Cordoba','-03:00' => '(-03:00) Maceio','-03:00' => '(-03:00) Argentina/Salta','-03:00' => '(-03:00) Argentina/Ushuaia','-03:30' => '(-03:30) St Johns','-04:00' => '(-04:00) St Barthelemy','-04:00' => '(-04:00) Port of Spain','-04:00' => '(-04:00) Santo Domingo','-04:00' => '(-04:00) Anguilla','-04:00' => '(-04:00) Tortola','-04:00' => '(-04:00) Thule','-04:00' => '(-04:00) Puerto Rico','-04:00' => '(-04:00) Barbados','-04:00' => '(-04:00) Porto Velho','-04:00' => '(-04:00) Moncton','-04:00' => '(-04:00) Martinique','-04:00' => '(-04:00) La Paz','-04:00' => '(-04:00) Cuiaba','-04:00' => '(-04:00) Antigua','-04:00' => '(-04:00) St Vincent','-04:00' => '(-04:00) Montserrat','-04:00' => '(-04:00) Boa Vista','-04:00' => '(-04:00) Marigot','-04:00' => '(-04:00) Manaus','-04:00' => '(-04:00) Kralendijk','-04:00' => '(-04:00) Goose Bay','-04:00' => '(-04:00) Dominica','-04:00' => '(-04:00) Campo Grande','-04:00' => '(-04:00) Lower Princes','-04:00' => '(-04:00) St Thomas','-04:00' => '(-04:00) Halifax','-04:00' => '(-04:00) St Lucia','-04:00' => '(-04:00) Caracas','-04:00' => '(-04:00) Guyana','-04:00' => '(-04:00) St Kitts','-04:00' => '(-04:00) Curacao','-04:00' => '(-04:00) Aruba','-04:00' => '(-04:00) Blanc-Sablon','-04:00' => '(-04:00) Glace Bay','-04:00' => '(-04:00) Grenada','-04:00' => '(-04:00) Guadeloupe','-05:00' => '(-05:00) Indiana/Marengo','-05:00' => '(-05:00) Indiana/Indianapolis','-05:00' => '(-05:00) Havana','-05:00' => '(-05:00) New York','-05:00' => '(-05:00) Indiana/Vincennes','-05:00' => '(-05:00) Jamaica','-05:00' => '(-05:00) Port-au-Prince','-05:00' => '(-05:00) Panama','-05:00' => '(-05:00) Nassau','-05:00' => '(-05:00) Thunder Bay','-05:00' => '(-05:00) Kentucky/Monticello','-05:00' => '(-05:00) Kentucky/Louisville','-05:00' => '(-05:00) Lima','-05:00' => '(-05:00) Atikokan','-05:00' => '(-05:00) Cancun','-05:00' => '(-05:00) Cayman','-05:00' => '(-05:00) Bogota','-05:00' => '(-05:00) Iqaluit','-05:00' => '(-05:00) Nipigon','-05:00' => '(-05:00) Pangnirtung','-05:00' => '(-05:00) Indiana/Vevay','-05:00' => '(-05:00) Indiana/Winamac','-05:00' => '(-05:00) Indiana/Petersburg','-05:00' => '(-05:00) Guayaquil','-05:00' => '(-05:00) Grand Turk','-05:00' => '(-05:00) Detroit','-05:00' => '(-05:00) Eirunepe','-05:00' => '(-05:00) Rio Branco','-05:00' => '(-05:00) Toronto','-06:00' => '(-06:00) Belize','-06:00' => '(-06:00) Indiana/Tell City','-06:00' => '(-06:00) Chicago','-06:00' => '(-06:00) Merida','-06:00' => '(-06:00) Managua','-06:00' => '(-06:00) Menominee','-06:00' => '(-06:00) Rankin Inlet','-06:00' => '(-06:00) Tegucigalpa','-06:00' => '(-06:00) Mexico City','-06:00' => '(-06:00) North Dakota/Center','-06:00' => '(-06:00) Rainy River','-06:00' => '(-06:00) Resolute','-06:00' => '(-06:00) Indiana/Knox','-06:00' => '(-06:00) El Salvador','-06:00' => '(-06:00) Costa Rica','-06:00' => '(-06:00) Matamoros','-06:00' => '(-06:00) Winnipeg','-06:00' => '(-06:00) Bahia Banderas','-06:00' => '(-06:00) Regina','-06:00' => '(-06:00) North Dakota/Beulah','-06:00' => '(-06:00) Swift Current','-06:00' => '(-06:00) Guatemala','-06:00' => '(-06:00) North Dakota/New Salem','-06:00' => '(-06:00) Monterrey','-07:00' => '(-07:00) Mazatlan','-07:00' => '(-07:00) Ojinaga','-07:00' => '(-07:00) Chihuahua','-07:00' => '(-07:00) Denver','-07:00' => '(-07:00) Phoenix','-07:00' => '(-07:00) Hermosillo','-07:00' => '(-07:00) Creston','-07:00' => '(-07:00) Yellowknife','-07:00' => '(-07:00) Inuvik','-07:00' => '(-07:00) Edmonton','-07:00' => '(-07:00) Dawson Creek','-07:00' => '(-07:00) Cambridge Bay','-07:00' => '(-07:00) Fort Nelson','-07:00' => '(-07:00) Boise','-08:00' => '(-08:00) Los Angeles','-08:00' => '(-08:00) Vancouver','-08:00' => '(-08:00) Tijuana','-08:00' => '(-08:00) Dawson','-08:00' => '(-08:00) Whitehorse','-09:00' => '(-09:00) Yakutat','-09:00' => '(-09:00) Juneau','-09:00' => '(-09:00) Nome','-09:00' => '(-09:00) Anchorage','-09:00' => '(-09:00) Sitka','-09:00' => '(-09:00) Metlakatla','-10:00' => '(-10:00) Adak'    );