java中如何处理夏令时?

/**
 * 夏令时测试(by菩提树下的杨过)
 */
@Test
public void testTimeZone() {
    LocalTime time = LocalTime.of(10, 20);
    ZoneId zoneId = ZoneId.of("Europe/London");

    // A summer date-time
    ZonedDateTime zdtSummer = ZonedDateTime.of(LocalDate.of(2022, 10, 15), time, zoneId);
    System.out.println(zdtSummer);

    // A winter date-time
    ZonedDateTime zdtWinter = ZonedDateTime.of(LocalDate.of(2022, 11, 15), time, zoneId);
    System.out.println(zdtWinter);
}

2022-10-15T10:20+01:00[Europe/London]
2022-11-15T10:20Z     [Europe/London]

/**
 * 输出全球所有时区（by菩提树下的杨过)
 */
@Test
public void getAvailableZoneIds() {
    Calendar c = Calendar.getInstance();
    System.out.println("year:" + c.get(Calendar.YEAR) + ",month:" + (c.get(Calendar.MONTH) + 1) + ",day:" + c.get(Calendar.DAY_OF_MONTH) + "\n");
    TreeMap<String, String> result = new TreeMap<>();
    //遍历所有ZoneId，并以今天9点时刻做为依赖，打印出每个ZoneId对应的时区
    for (String strZoneId : ZoneId.getAvailableZoneIds()) {
        LocalTime time = LocalTime.of(9, 0);
        ZoneId zoneId = ZoneId.of(strZoneId);
        ZonedDateTime zonedDateTime = ZonedDateTime.of(LocalDate.of(c.get(Calendar.YEAR), c.get(Calendar.MONTH) + 1, c.get(Calendar.DAY_OF_MONTH)), time, zoneId);
        String offSet = zonedDateTime.getOffset().toString().split(":")[0];
        if ("Z".equalsIgnoreCase(offSet)) {
            offSet = "+0";
        } else {
            int temp = Integer.valueOf(offSet);
            if (temp > 0) {
                offSet = "+" + temp;
            } else {
                offSet = "" + temp;
            }
        }
        result.put(strZoneId, "GMT" + offSet);
    }
    for (Map.Entry<String, String> entry : result.entrySet()) {
        System.out.println(entry.getValue() + "\t" + entry.getKey());
    }
}

year:2022,month:11,day:13

GMT+0	Africa/Abidjan
GMT+0	Africa/Accra
GMT+3	Africa/Addis_Ababa
GMT+1	Africa/Algiers
GMT+3	Africa/Asmara
GMT+3	Africa/Asmera
GMT+0	Africa/Bamako
GMT+1	Africa/Bangui
GMT+0	Africa/Banjul
GMT+0	Africa/Bissau
GMT+2	Africa/Blantyre
GMT+1	Africa/Brazzaville
GMT+2	Africa/Bujumbura
GMT+2	Africa/Cairo
GMT+1	Africa/Casablanca
GMT+1	Africa/Ceuta
GMT+0	Africa/Conakry
GMT+0	Africa/Dakar
GMT+3	Africa/Dar_es_Salaam
GMT+3	Africa/Djibouti
GMT+1	Africa/Douala
GMT+1	Africa/El_Aaiun
GMT+0	Africa/Freetown
GMT+2	Africa/Gaborone
GMT+2	Africa/Harare
GMT+2	Africa/Johannesburg
GMT+3	Africa/Juba
GMT+3	Africa/Kampala
GMT+2	Africa/Khartoum
GMT+2	Africa/Kigali
GMT+1	Africa/Kinshasa
GMT+1	Africa/Lagos
GMT+1	Africa/Libreville
GMT+0	Africa/Lome
GMT+1	Africa/Luanda
GMT+2	Africa/Lubumbashi
GMT+2	Africa/Lusaka
GMT+1	Africa/Malabo
GMT+2	Africa/Maputo
GMT+2	Africa/Maseru
GMT+2	Africa/Mbabane
GMT+3	Africa/Mogadishu
GMT+0	Africa/Monrovia
GMT+3	Africa/Nairobi
GMT+1	Africa/Ndjamena
GMT+1	Africa/Niamey
GMT+0	Africa/Nouakchott
GMT+0	Africa/Ouagadougou
GMT+1	Africa/Porto-Novo
GMT+1	Africa/Sao_Tome
GMT+0	Africa/Timbuktu
GMT+2	Africa/Tripoli
GMT+1	Africa/Tunis
GMT+2	Africa/Windhoek
GMT-10	America/Adak
GMT-9	America/Anchorage
GMT-4	America/Anguilla
GMT-4	America/Antigua
GMT-3	America/Araguaina
GMT-3	America/Argentina/Buenos_Aires
GMT-3	America/Argentina/Catamarca
GMT-3	America/Argentina/ComodRivadavia
GMT-3	America/Argentina/Cordoba
GMT-3	America/Argentina/Jujuy
GMT-3	America/Argentina/La_Rioja
GMT-3	America/Argentina/Mendoza
GMT-3	America/Argentina/Rio_Gallegos
GMT-3	America/Argentina/Salta
GMT-3	America/Argentina/San_Juan
GMT-3	America/Argentina/San_Luis
GMT-3	America/Argentina/Tucuman
GMT-3	America/Argentina/Ushuaia
GMT-4	America/Aruba
GMT-3	America/Asuncion
GMT-5	America/Atikokan
GMT-10	America/Atka
GMT-3	America/Bahia
GMT-6	America/Bahia_Banderas
GMT-4	America/Barbados
GMT-3	America/Belem
GMT-6	America/Belize
GMT-4	America/Blanc-Sablon
GMT-4	America/Boa_Vista
GMT-5	America/Bogota
GMT-7	America/Boise
GMT-3	America/Buenos_Aires
GMT-7	America/Cambridge_Bay
GMT-3	America/Campo_Grande
GMT-5	America/Cancun
GMT-4	America/Caracas
GMT-3	America/Catamarca
GMT-3	America/Cayenne
GMT-5	America/Cayman
GMT-6	America/Chicago
GMT-7	America/Chihuahua
GMT-5	America/Coral_Harbour
GMT-3	America/Cordoba
GMT-6	America/Costa_Rica
GMT-7	America/Creston
GMT-3	America/Cuiaba
GMT-4	America/Curacao
GMT+0	America/Danmarkshavn
GMT-8	America/Dawson
GMT-7	America/Dawson_Creek
GMT-7	America/Denver
GMT-5	America/Detroit
GMT-4	America/Dominica
GMT-7	America/Edmonton
GMT-5	America/Eirunepe
GMT-6	America/El_Salvador
GMT-8	America/Ensenada
GMT-7	America/Fort_Nelson
GMT-5	America/Fort_Wayne
GMT-3	America/Fortaleza
GMT-4	America/Glace_Bay
GMT-3	America/Godthab
GMT-4	America/Goose_Bay
GMT-5	America/Grand_Turk
GMT-4	America/Grenada
GMT-4	America/Guadeloupe
GMT-6	America/Guatemala
GMT-5	America/Guayaquil
GMT-4	America/Guyana
GMT-4	America/Halifax
GMT-5	America/Havana
GMT-7	America/Hermosillo
GMT-5	America/Indiana/Indianapolis
GMT-6	America/Indiana/Knox
GMT-5	America/Indiana/Marengo
GMT-5	America/Indiana/Petersburg
GMT-6	America/Indiana/Tell_City
GMT-5	America/Indiana/Vevay
GMT-5	America/Indiana/Vincennes
GMT-5	America/Indiana/Winamac
GMT-5	America/Indianapolis
GMT-7	America/Inuvik
GMT-5	America/Iqaluit
GMT-5	America/Jamaica
GMT-3	America/Jujuy
GMT-9	America/Juneau
GMT-5	America/Kentucky/Louisville
GMT-5	America/Kentucky/Monticello
GMT-6	America/Knox_IN
GMT-4	America/Kralendijk
GMT-4	America/La_Paz
GMT-5	America/Lima
GMT-8	America/Los_Angeles
GMT-5	America/Louisville
GMT-4	America/Lower_Princes
GMT-3	America/Maceio
GMT-6	America/Managua
GMT-4	America/Manaus
GMT-4	America/Marigot
GMT-4	America/Martinique
GMT-6	America/Matamoros
GMT-7	America/Mazatlan
GMT-3	America/Mendoza
GMT-6	America/Menominee
GMT-6	America/Merida
GMT-9	America/Metlakatla
GMT-6	America/Mexico_City
GMT-3	America/Miquelon
GMT-4	America/Moncton
GMT-6	America/Monterrey
GMT-3	America/Montevideo
GMT-5	America/Montreal
GMT-4	America/Montserrat
GMT-5	America/Nassau
GMT-5	America/New_York
GMT-5	America/Nipigon
GMT-9	America/Nome
GMT-2	America/Noronha
GMT-6	America/North_Dakota/Beulah
GMT-6	America/North_Dakota/Center
GMT-6	America/North_Dakota/New_Salem
GMT-7	America/Ojinaga
GMT-5	America/Panama
GMT-5	America/Pangnirtung
GMT-3	America/Paramaribo
GMT-7	America/Phoenix
GMT-5	America/Port-au-Prince
GMT-4	America/Port_of_Spain
GMT-5	America/Porto_Acre
GMT-4	America/Porto_Velho
GMT-4	America/Puerto_Rico
GMT-3	America/Punta_Arenas
GMT-6	America/Rainy_River
GMT-6	America/Rankin_Inlet
GMT-3	America/Recife
GMT-6	America/Regina
GMT-6	America/Resolute
GMT-5	America/Rio_Branco
GMT-3	America/Rosario
GMT-8	America/Santa_Isabel
GMT-3	America/Santarem
GMT-3	America/Santiago
GMT-4	America/Santo_Domingo
GMT-2	America/Sao_Paulo
GMT-1	America/Scoresbysund
GMT-7	America/Shiprock
GMT-9	America/Sitka
GMT-4	America/St_Barthelemy
GMT-3	America/St_Johns
GMT-4	America/St_Kitts
GMT-4	America/St_Lucia
GMT-4	America/St_Thomas
GMT-4	America/St_Vincent
GMT-6	America/Swift_Current
GMT-6	America/Tegucigalpa
GMT-4	America/Thule
GMT-5	America/Thunder_Bay
GMT-8	America/Tijuana
GMT-5	America/Toronto
GMT-4	America/Tortola
GMT-8	America/Vancouver
GMT-4	America/Virgin
GMT-8	America/Whitehorse
GMT-6	America/Winnipeg
GMT-9	America/Yakutat
GMT-7	America/Yellowknife
GMT+8	Antarctica/Casey
GMT+7	Antarctica/Davis
GMT+10	Antarctica/DumontDUrville
GMT+11	Antarctica/Macquarie
GMT+5	Antarctica/Mawson
GMT+13	Antarctica/McMurdo
GMT-3	Antarctica/Palmer
GMT-3	Antarctica/Rothera
GMT+13	Antarctica/South_Pole
GMT+3	Antarctica/Syowa
GMT+0	Antarctica/Troll
GMT+6	Antarctica/Vostok
GMT+1	Arctic/Longyearbyen
GMT+3	Asia/Aden
GMT+6	Asia/Almaty
GMT+2	Asia/Amman
GMT+12	Asia/Anadyr
GMT+5	Asia/Aqtau
GMT+5	Asia/Aqtobe
GMT+5	Asia/Ashgabat
GMT+5	Asia/Ashkhabad
GMT+5	Asia/Atyrau
GMT+3	Asia/Baghdad
GMT+3	Asia/Bahrain
GMT+4	Asia/Baku
GMT+7	Asia/Bangkok
GMT+7	Asia/Barnaul
GMT+2	Asia/Beirut
GMT+6	Asia/Bishkek
GMT+8	Asia/Brunei
GMT+5	Asia/Calcutta
GMT+9	Asia/Chita
GMT+8	Asia/Choibalsan
GMT+8	Asia/Chongqing
GMT+8	Asia/Chungking
GMT+5	Asia/Colombo
GMT+6	Asia/Dacca
GMT+2	Asia/Damascus
GMT+6	Asia/Dhaka
GMT+9	Asia/Dili
GMT+4	Asia/Dubai
GMT+5	Asia/Dushanbe
GMT+2	Asia/Famagusta
GMT+2	Asia/Gaza
GMT+8	Asia/Harbin
GMT+2	Asia/Hebron
GMT+7	Asia/Ho_Chi_Minh
GMT+8	Asia/Hong_Kong
GMT+7	Asia/Hovd
GMT+8	Asia/Irkutsk
GMT+3	Asia/Istanbul
GMT+7	Asia/Jakarta
GMT+9	Asia/Jayapura
GMT+2	Asia/Jerusalem
GMT+4	Asia/Kabul
GMT+12	Asia/Kamchatka
GMT+5	Asia/Karachi
GMT+6	Asia/Kashgar
GMT+5	Asia/Kathmandu
GMT+5	Asia/Katmandu
GMT+9	Asia/Khandyga
GMT+5	Asia/Kolkata
GMT+7	Asia/Krasnoyarsk
GMT+8	Asia/Kuala_Lumpur
GMT+8	Asia/Kuching
GMT+3	Asia/Kuwait
GMT+8	Asia/Macao
GMT+8	Asia/Macau
GMT+11	Asia/Magadan
GMT+8	Asia/Makassar
GMT+8	Asia/Manila
GMT+4	Asia/Muscat
GMT+2	Asia/Nicosia
GMT+7	Asia/Novokuznetsk
GMT+7	Asia/Novosibirsk
GMT+6	Asia/Omsk
GMT+5	Asia/Oral
GMT+7	Asia/Phnom_Penh
GMT+7	Asia/Pontianak
GMT+9	Asia/Pyongyang
GMT+3	Asia/Qatar
GMT+6	Asia/Qyzylorda
GMT+6	Asia/Rangoon
GMT+3	Asia/Riyadh
GMT+7	Asia/Saigon
GMT+11	Asia/Sakhalin
GMT+5	Asia/Samarkand
GMT+9	Asia/Seoul
GMT+8	Asia/Shanghai
GMT+8	Asia/Singapore
GMT+11	Asia/Srednekolymsk
GMT+8	Asia/Taipei
GMT+5	Asia/Tashkent
GMT+4	Asia/Tbilisi
GMT+3	Asia/Tehran
GMT+2	Asia/Tel_Aviv
GMT+6	Asia/Thimbu
GMT+6	Asia/Thimphu
GMT+9	Asia/Tokyo
GMT+7	Asia/Tomsk
GMT+8	Asia/Ujung_Pandang
GMT+8	Asia/Ulaanbaatar
GMT+8	Asia/Ulan_Bator
GMT+6	Asia/Urumqi
GMT+10	Asia/Ust-Nera
GMT+7	Asia/Vientiane
GMT+10	Asia/Vladivostok
GMT+9	Asia/Yakutsk
GMT+6	Asia/Yangon
GMT+5	Asia/Yekaterinburg
GMT+4	Asia/Yerevan
GMT-1	Atlantic/Azores
GMT-4	Atlantic/Bermuda
GMT+0	Atlantic/Canary
GMT-1	Atlantic/Cape_Verde
GMT+0	Atlantic/Faeroe
GMT+0	Atlantic/Faroe
GMT+1	Atlantic/Jan_Mayen
GMT+0	Atlantic/Madeira
GMT+0	Atlantic/Reykjavik
GMT-2	Atlantic/South_Georgia
GMT+0	Atlantic/St_Helena
GMT-3	Atlantic/Stanley
GMT+11	Australia/ACT
GMT+10	Australia/Adelaide
GMT+10	Australia/Brisbane
GMT+10	Australia/Broken_Hill
GMT+11	Australia/Canberra
GMT+11	Australia/Currie
GMT+9	Australia/Darwin
GMT+8	Australia/Eucla
GMT+11	Australia/Hobart
GMT+11	Australia/LHI
GMT+10	Australia/Lindeman
GMT+11	Australia/Lord_Howe
GMT+11	Australia/Melbourne
GMT+11	Australia/NSW
GMT+9	Australia/North
GMT+8	Australia/Perth
GMT+10	Australia/Queensland
GMT+10	Australia/South
GMT+11	Australia/Sydney
GMT+11	Australia/Tasmania
GMT+11	Australia/Victoria
GMT+8	Australia/West
GMT+10	Australia/Yancowinna
GMT-5	Brazil/Acre
GMT-2	Brazil/DeNoronha
GMT-2	Brazil/East
GMT-4	Brazil/West
GMT+1	CET
GMT-6	CST6CDT
GMT-4	Canada/Atlantic
GMT-6	Canada/Central
GMT-5	Canada/Eastern
GMT-7	Canada/Mountain
GMT-3	Canada/Newfoundland
GMT-8	Canada/Pacific
GMT-6	Canada/Saskatchewan
GMT-8	Canada/Yukon
GMT-3	Chile/Continental
GMT-5	Chile/EasterIsland
GMT-5	Cuba
GMT+2	EET
GMT-5	EST5EDT
GMT+2	Egypt
GMT+0	Eire
GMT+0	Etc/GMT
GMT+0	Etc/GMT+0
GMT-1	Etc/GMT+1
GMT-10	Etc/GMT+10
GMT-11	Etc/GMT+11
GMT-12	Etc/GMT+12
GMT-2	Etc/GMT+2
GMT-3	Etc/GMT+3
GMT-4	Etc/GMT+4
GMT-5	Etc/GMT+5
GMT-6	Etc/GMT+6
GMT-7	Etc/GMT+7
GMT-8	Etc/GMT+8
GMT-9	Etc/GMT+9
GMT+0	Etc/GMT-0
GMT+1	Etc/GMT-1
GMT+10	Etc/GMT-10
GMT+11	Etc/GMT-11
GMT+12	Etc/GMT-12
GMT+13	Etc/GMT-13
GMT+14	Etc/GMT-14
GMT+2	Etc/GMT-2
GMT+3	Etc/GMT-3
GMT+4	Etc/GMT-4
GMT+5	Etc/GMT-5
GMT+6	Etc/GMT-6
GMT+7	Etc/GMT-7
GMT+8	Etc/GMT-8
GMT+9	Etc/GMT-9
GMT+0	Etc/GMT0
GMT+0	Etc/Greenwich
GMT+0	Etc/UCT
GMT+0	Etc/UTC
GMT+0	Etc/Universal
GMT+0	Etc/Zulu
GMT+1	Europe/Amsterdam
GMT+1	Europe/Andorra
GMT+4	Europe/Astrakhan
GMT+2	Europe/Athens
GMT+0	Europe/Belfast
GMT+1	Europe/Belgrade
GMT+1	Europe/Berlin
GMT+1	Europe/Bratislava
GMT+1	Europe/Brussels
GMT+2	Europe/Bucharest
GMT+1	Europe/Budapest
GMT+1	Europe/Busingen
GMT+2	Europe/Chisinau
GMT+1	Europe/Copenhagen
GMT+0	Europe/Dublin
GMT+1	Europe/Gibraltar
GMT+0	Europe/Guernsey
GMT+2	Europe/Helsinki
GMT+0	Europe/Isle_of_Man
GMT+3	Europe/Istanbul
GMT+0	Europe/Jersey
GMT+2	Europe/Kaliningrad
GMT+2	Europe/Kiev
GMT+3	Europe/Kirov
GMT+0	Europe/Lisbon
GMT+1	Europe/Ljubljana
GMT+0	Europe/London
GMT+1	Europe/Luxembourg
GMT+1	Europe/Madrid
GMT+1	Europe/Malta
GMT+2	Europe/Mariehamn
GMT+3	Europe/Minsk
GMT+1	Europe/Monaco
GMT+3	Europe/Moscow
GMT+2	Europe/Nicosia
GMT+1	Europe/Oslo
GMT+1	Europe/Paris
GMT+1	Europe/Podgorica
GMT+1	Europe/Prague
GMT+2	Europe/Riga
GMT+1	Europe/Rome
GMT+4	Europe/Samara
GMT+1	Europe/San_Marino
GMT+1	Europe/Sarajevo
GMT+4	Europe/Saratov
GMT+3	Europe/Simferopol
GMT+1	Europe/Skopje
GMT+2	Europe/Sofia
GMT+1	Europe/Stockholm
GMT+2	Europe/Tallinn
GMT+1	Europe/Tirane
GMT+2	Europe/Tiraspol
GMT+4	Europe/Ulyanovsk
GMT+2	Europe/Uzhgorod
GMT+1	Europe/Vaduz
GMT+1	Europe/Vatican
GMT+1	Europe/Vienna
GMT+2	Europe/Vilnius
GMT+4	Europe/Volgograd
GMT+1	Europe/Warsaw
GMT+1	Europe/Zagreb
GMT+2	Europe/Zaporozhye
GMT+1	Europe/Zurich
GMT+0	GB
GMT+0	GB-Eire
GMT+0	GMT
GMT+0	GMT0
GMT+0	Greenwich
GMT+8	Hongkong
GMT+0	Iceland
GMT+3	Indian/Antananarivo
GMT+6	Indian/Chagos
GMT+7	Indian/Christmas
GMT+6	Indian/Cocos
GMT+3	Indian/Comoro
GMT+5	Indian/Kerguelen
GMT+4	Indian/Mahe
GMT+5	Indian/Maldives
GMT+4	Indian/Mauritius
GMT+3	Indian/Mayotte
GMT+4	Indian/Reunion
GMT+3	Iran
GMT+2	Israel
GMT-5	Jamaica
GMT+9	Japan
GMT+12	Kwajalein
GMT+2	Libya
GMT+1	MET
GMT-7	MST7MDT
GMT-8	Mexico/BajaNorte
GMT-7	Mexico/BajaSur
GMT-6	Mexico/General
GMT+13	NZ
GMT+13	NZ-CHAT
GMT-7	Navajo
GMT+8	PRC
GMT-8	PST8PDT
GMT+14	Pacific/Apia
GMT+13	Pacific/Auckland
GMT+11	Pacific/Bougainville
GMT+13	Pacific/Chatham
GMT+10	Pacific/Chuuk
GMT-5	Pacific/Easter
GMT+11	Pacific/Efate
GMT+13	Pacific/Enderbury
GMT+13	Pacific/Fakaofo
GMT+13	Pacific/Fiji
GMT+12	Pacific/Funafuti
GMT-6	Pacific/Galapagos
GMT-9	Pacific/Gambier
GMT+11	Pacific/Guadalcanal
GMT+10	Pacific/Guam
GMT-10	Pacific/Honolulu
GMT-10	Pacific/Johnston
GMT+14	Pacific/Kiritimati
GMT+11	Pacific/Kosrae
GMT+12	Pacific/Kwajalein
GMT+12	Pacific/Majuro
GMT-9	Pacific/Marquesas
GMT-11	Pacific/Midway
GMT+12	Pacific/Nauru
GMT-11	Pacific/Niue
GMT+11	Pacific/Norfolk
GMT+11	Pacific/Noumea
GMT-11	Pacific/Pago_Pago
GMT+9	Pacific/Palau
GMT-8	Pacific/Pitcairn
GMT+11	Pacific/Pohnpei
GMT+11	Pacific/Ponape
GMT+10	Pacific/Port_Moresby
GMT-10	Pacific/Rarotonga
GMT+10	Pacific/Saipan
GMT-11	Pacific/Samoa
GMT-10	Pacific/Tahiti
GMT+12	Pacific/Tarawa
GMT+13	Pacific/Tongatapu
GMT+10	Pacific/Truk
GMT+12	Pacific/Wake
GMT+12	Pacific/Wallis
GMT+10	Pacific/Yap
GMT+1	Poland
GMT+0	Portugal
GMT+9	ROK
GMT+8	Singapore
GMT-4	SystemV/AST4
GMT-4	SystemV/AST4ADT
GMT-6	SystemV/CST6
GMT-6	SystemV/CST6CDT
GMT-5	SystemV/EST5
GMT-5	SystemV/EST5EDT
GMT-10	SystemV/HST10
GMT-7	SystemV/MST7
GMT-7	SystemV/MST7MDT
GMT-8	SystemV/PST8
GMT-8	SystemV/PST8PDT
GMT-9	SystemV/YST9
GMT-9	SystemV/YST9YDT
GMT+3	Turkey
GMT+0	UCT
GMT-9	US/Alaska
GMT-10	US/Aleutian
GMT-7	US/Arizona
GMT-6	US/Central
GMT-5	US/East-Indiana
GMT-5	US/Eastern
GMT-10	US/Hawaii
GMT-6	US/Indiana-Starke
GMT-5	US/Michigan
GMT-7	US/Mountain
GMT-8	US/Pacific
GMT-8	US/Pacific-New
GMT-11	US/Samoa
GMT+0	UTC
GMT+0	Universal
GMT+3	W-SU
GMT+0	WET
GMT+0	Zulu