The query returns time zones grouped by offset so that it will be easier to chose:
SELECT utc_offset, is_dst, ltrim( trim(string_agg(distinct (CASE WHEN abbrev NOT LIKE '+%' AND abbrev NOT LIKE '-%' AND abbrev != name THEN abbrev ELSE '' END), '')) ||'' || string_agg(name, ', ' ORDER BY name) )FROM pg_timezone_namesWHERE name NOT LIKE 'posix/%' AND name NOT LIKE 'Etc/%' AND name NOT IN ('HST', 'Factory', 'GMT', 'GMT+0', 'GMT-0', 'GMT0', 'localtime', 'UCT', 'Universal', 'UTC', 'PST8PDT', 'ROK', 'W-SU', 'MST', 'CST6CDT')GROUP BY utc_offset, is_dstORDER BY utc_offset, is_dstAnd result is:
-11,false,"SST Pacific/Midway, Pacific/Niue, Pacific/Pago_Pago, Pacific/Samoa, US/Samoa"-10,false,"HST Pacific/Honolulu, Pacific/Johnston, Pacific/Rarotonga, Pacific/Tahiti, US/Hawaii"-9:30,false,Pacific/Marquesas-9,false,Pacific/Gambier-9,true,"HDT America/Adak, America/Atka, US/Aleutian"-8,false,Pacific/Pitcairn-8,true,"AKDT America/Anchorage, America/Juneau, America/Metlakatla, America/Nome, America/Sitka, America/Yakutat, US/Alaska"-7,false,"MST America/Creston, America/Dawson, America/Dawson_Creek, America/Fort_Nelson, America/Hermosillo, America/Phoenix, America/Whitehorse, Canada/Yukon, US/Arizona"-7,true,"PDT America/Ensenada, America/Los_Angeles, America/Santa_Isabel, America/Tijuana, America/Vancouver, Canada/Pacific, Mexico/BajaNorte, US/Pacific"-6,false,"CST America/Belize, America/Costa_Rica, America/El_Salvador, America/Guatemala, America/Managua, America/Regina, America/Swift_Current, America/Tegucigalpa, Canada/Saskatchewan, Chile/EasterIsland, Pacific/Easter, Pacific/Galapagos"-6,true,"MDT America/Boise, America/Cambridge_Bay, America/Chihuahua, America/Denver, America/Edmonton, America/Inuvik, America/Mazatlan, America/Ojinaga, America/Shiprock, America/Yellowknife, Canada/Mountain, Mexico/BajaSur, MST7MDT, Navajo, US/Mountain"-5,false,"EST America/Atikokan, America/Bogota, America/Cancun, America/Cayman, America/Coral_Harbour, America/Eirunepe, America/Guayaquil, America/Jamaica, America/Lima, America/Panama, America/Porto_Acre, America/Rio_Branco, Brazil/Acre, EST, Jamaica"-5,true,"CDT America/Bahia_Banderas, America/Chicago, America/Indiana/Knox, America/Indiana/Tell_City, America/Knox_IN, America/Matamoros, America/Menominee, America/Merida, America/Mexico_City, America/Monterrey, America/North_Dakota/Beulah, America/North_Dakota/Center, America/North_Dakota/New_Salem, America/Rainy_River, America/Rankin_Inlet, America/Resolute, America/Winnipeg, Canada/Central, Mexico/General, US/Central, US/Indiana-Starke"-4,false,"AST America/Anguilla, America/Antigua, America/Aruba, America/Asuncion, America/Barbados, America/Blanc-Sablon, America/Boa_Vista, America/Campo_Grande, America/Caracas, America/Cuiaba, America/Curacao, America/Dominica, America/Grenada, America/Guadeloupe, America/Guyana, America/Kralendijk, America/La_Paz, America/Lower_Princes, America/Manaus, America/Marigot, America/Martinique, America/Montserrat, America/Port_of_Spain, America/Porto_Velho, America/Puerto_Rico, America/Santiago, America/Santo_Domingo, America/St_Barthelemy, America/St_Kitts, America/St_Lucia, America/St_Thomas, America/St_Vincent, America/Tortola, America/Virgin, Brazil/West, Chile/Continental"-4,true,"CDT EDT America/Detroit, America/Fort_Wayne, America/Grand_Turk, America/Havana, America/Indiana/Indianapolis, America/Indiana/Marengo, America/Indiana/Petersburg, America/Indianapolis, America/Indiana/Vevay, America/Indiana/Vincennes, America/Indiana/Winamac, America/Iqaluit, America/Kentucky/Louisville, America/Kentucky/Monticello, America/Louisville, America/Montreal, America/Nassau, America/New_York, America/Nipigon, America/Pangnirtung, America/Port-au-Prince, America/Thunder_Bay, America/Toronto, Canada/Eastern, Cuba, EST5EDT, posixrules, US/Eastern, US/East-Indiana, US/Michigan"-3,false,"America/Araguaina, America/Argentina/Buenos_Aires, America/Argentina/Catamarca, America/Argentina/ComodRivadavia, America/Argentina/Cordoba, America/Argentina/Jujuy, America/Argentina/La_Rioja, America/Argentina/Mendoza, America/Argentina/Rio_Gallegos, America/Argentina/Salta, America/Argentina/San_Juan, America/Argentina/San_Luis, America/Argentina/Tucuman, America/Argentina/Ushuaia, America/Bahia, America/Belem, America/Buenos_Aires, America/Catamarca, America/Cayenne, America/Cordoba, America/Fortaleza, America/Jujuy, America/Maceio, America/Mendoza, America/Montevideo, America/Paramaribo, America/Punta_Arenas, America/Recife, America/Rosario, America/Santarem, America/Sao_Paulo, Antarctica/Palmer, Antarctica/Rothera, Atlantic/Stanley, Brazil/East"-3,true,"ADT America/Glace_Bay, America/Goose_Bay, America/Halifax, America/Moncton, America/Thule, Atlantic/Bermuda, Canada/Atlantic"-2:30,true,"NDT America/St_Johns, Canada/Newfoundland"-2,false,"America/Noronha, Atlantic/South_Georgia, Brazil/DeNoronha"-2,true,"America/Godthab, America/Miquelon, America/Nuuk"-1,false,Atlantic/Cape_Verde+0,false,"GMT UTC Africa/Abidjan, Africa/Accra, Africa/Bamako, Africa/Banjul, Africa/Bissau, Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, Africa/Monrovia, Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, Africa/Timbuktu, America/Danmarkshavn, Atlantic/Reykjavik, Atlantic/St_Helena, Greenwich, Iceland, Zulu"+0,true,"America/Scoresbysund, Atlantic/Azores"+1,false,"CET IST WAT Africa/Algiers, Africa/Bangui, Africa/Brazzaville, Africa/Casablanca, Africa/Douala, Africa/El_Aaiun, Africa/Kinshasa, Africa/Lagos, Africa/Libreville, Africa/Luanda, Africa/Malabo, Africa/Ndjamena, Africa/Niamey, Africa/Porto-Novo, Africa/Tunis, Eire, Europe/Dublin"+1,true,"BST WEST Atlantic/Canary, Atlantic/Faeroe, Atlantic/Faroe, Atlantic/Madeira, Europe/Belfast, Europe/Guernsey, Europe/Isle_of_Man, Europe/Jersey, Europe/Lisbon, Europe/London, GB, GB-Eire, Portugal, WET"+2,false,"CAT EET SAST Africa/Blantyre, Africa/Bujumbura, Africa/Cairo, Africa/Gaborone, Africa/Harare, Africa/Johannesburg, Africa/Juba, Africa/Khartoum, Africa/Kigali, Africa/Lubumbashi, Africa/Lusaka, Africa/Maputo, Africa/Maseru, Africa/Mbabane, Africa/Tripoli, Africa/Windhoek, Egypt, Europe/Kaliningrad, Libya"+2,true,"CEST MEST Africa/Ceuta, Antarctica/Troll, Arctic/Longyearbyen, Atlantic/Jan_Mayen, CET, Europe/Amsterdam, Europe/Andorra, Europe/Belgrade, Europe/Berlin, Europe/Bratislava, Europe/Brussels, Europe/Budapest, Europe/Busingen, Europe/Copenhagen, Europe/Gibraltar, Europe/Ljubljana, Europe/Luxembourg, Europe/Madrid, Europe/Malta, Europe/Monaco, Europe/Oslo, Europe/Paris, Europe/Podgorica, Europe/Prague, Europe/Rome, Europe/San_Marino, Europe/Sarajevo, Europe/Skopje, Europe/Stockholm, Europe/Tirane, Europe/Vaduz, Europe/Vatican, Europe/Vienna, Europe/Warsaw, Europe/Zagreb, Europe/Zurich, MET, Poland"+3,false,"EAT MSK Africa/Addis_Ababa, Africa/Asmara, Africa/Asmera, Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, Africa/Mogadishu, Africa/Nairobi, Antarctica/Syowa, Asia/Aden, Asia/Baghdad, Asia/Bahrain, Asia/Istanbul, Asia/Kuwait, Asia/Qatar, Asia/Riyadh, Europe/Istanbul, Europe/Kirov, Europe/Minsk, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, Indian/Antananarivo, Indian/Comoro, Indian/Mayotte, Turkey"+3,true,"EEST IDT Asia/Amman, Asia/Beirut, Asia/Damascus, Asia/Famagusta, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, Asia/Nicosia, Asia/Tel_Aviv, EET, Europe/Athens, Europe/Bucharest, Europe/Chisinau, Europe/Helsinki, Europe/Kiev, Europe/Mariehamn, Europe/Nicosia, Europe/Riga, Europe/Sofia, Europe/Tallinn, Europe/Tiraspol, Europe/Uzhgorod, Europe/Vilnius, Europe/Zaporozhye, Israel"+4,false,"Asia/Baku, Asia/Dubai, Asia/Muscat, Asia/Tbilisi, Asia/Yerevan, Europe/Astrakhan, Europe/Samara, Europe/Saratov, Europe/Ulyanovsk, Indian/Mahe, Indian/Mauritius, Indian/Reunion"+4:30,false,Asia/Kabul+4:30,true,"Asia/Tehran, Iran"+5,false,"PKT Antarctica/Mawson, Asia/Aqtau, Asia/Aqtobe, Asia/Ashgabat, Asia/Ashkhabad, Asia/Atyrau, Asia/Dushanbe, Asia/Karachi, Asia/Oral, Asia/Qyzylorda, Asia/Samarkand, Asia/Tashkent, Asia/Yekaterinburg, Indian/Kerguelen, Indian/Maldives"+5:30,false,"IST Asia/Calcutta, Asia/Colombo, Asia/Kolkata"+5:45,false,"Asia/Kathmandu, Asia/Katmandu"+6,false,"Antarctica/Vostok, Asia/Almaty, Asia/Bishkek, Asia/Dacca, Asia/Dhaka, Asia/Kashgar, Asia/Omsk, Asia/Qostanay, Asia/Thimbu, Asia/Thimphu, Asia/Urumqi, Indian/Chagos"+6:30,false,"Asia/Rangoon, Asia/Yangon, Indian/Cocos"+7,false,"WIB Antarctica/Davis, Asia/Bangkok, Asia/Barnaul, Asia/Ho_Chi_Minh, Asia/Hovd, Asia/Jakarta, Asia/Krasnoyarsk, Asia/Novokuznetsk, Asia/Novosibirsk, Asia/Phnom_Penh, Asia/Pontianak, Asia/Saigon, Asia/Tomsk, Asia/Vientiane, Indian/Christmas"+8,false,"AWST CST HKT PST WITA Asia/Brunei, Asia/Choibalsan, Asia/Chongqing, Asia/Chungking, Asia/Harbin, Asia/Hong_Kong, Asia/Irkutsk, Asia/Kuala_Lumpur, Asia/Kuching, Asia/Macao, Asia/Macau, Asia/Makassar, Asia/Manila, Asia/Shanghai, Asia/Singapore, Asia/Taipei, Asia/Ujung_Pandang, Asia/Ulaanbaatar, Asia/Ulan_Bator, Australia/Perth, Australia/West, Hongkong, PRC, ROC, Singapore"+8:45,false,Australia/Eucla+9,false,"JST KST WIT Asia/Chita, Asia/Dili, Asia/Jayapura, Asia/Khandyga, Asia/Pyongyang, Asia/Seoul, Asia/Tokyo, Asia/Yakutsk, Japan, Pacific/Palau"+9:30,false,"ACST Australia/Adelaide, Australia/Broken_Hill, Australia/Darwin, Australia/North, Australia/South, Australia/Yancowinna"+10,false,"AEST ChST Antarctica/DumontDUrville, Antarctica/Macquarie, Asia/Ust-Nera, Asia/Vladivostok, Australia/ACT, Australia/Brisbane, Australia/Canberra, Australia/Currie, Australia/Hobart, Australia/Lindeman, Australia/Melbourne, Australia/NSW, Australia/Queensland, Australia/Sydney, Australia/Tasmania, Australia/Victoria, Pacific/Chuuk, Pacific/Guam, Pacific/Port_Moresby, Pacific/Saipan, Pacific/Truk, Pacific/Yap"+10:30,false,"Australia/LHI, Australia/Lord_Howe"+11,false,"Antarctica/Casey, Asia/Magadan, Asia/Sakhalin, Asia/Srednekolymsk, Pacific/Bougainville, Pacific/Efate, Pacific/Guadalcanal, Pacific/Kosrae, Pacific/Norfolk, Pacific/Noumea, Pacific/Pohnpei, Pacific/Ponape"+12,false,"NZST Antarctica/McMurdo, Antarctica/South_Pole, Asia/Anadyr, Asia/Kamchatka, Kwajalein, NZ, Pacific/Auckland, Pacific/Fiji, Pacific/Funafuti, Pacific/Kwajalein, Pacific/Majuro, Pacific/Nauru, Pacific/Tarawa, Pacific/Wake, Pacific/Wallis"+12:45,false,"NZ-CHAT, Pacific/Chatham"+13,false,"Pacific/Apia, Pacific/Enderbury, Pacific/Fakaofo, Pacific/Kanton, Pacific/Tongatapu"+14,false,Pacific/KiritimatiThis is ready to use for a Time Zone selector. The DST i.e. a summer time items I show in a different color.