CST 时区

名为 CST 的时区是一个很混乱的时区，有四种含义：

美国中部时间 Central Standard Time (USA) UTC-06:00

澳大利亚中部时间 Central Standard Time (Australia) UTC+09:30

中国标准时 China Standard Time UTC+08:00

古巴标准时 Cuba Standard Time UTC-04:00

今天是“4月28日”。为什么提到日期？因为美国从“3月11日”至“11月7日”实行夏令时，美国中部时间改为 UTC-05:00，与 UTC+08:00 相差 13 小时。

排错过程

在项目中，偶然发现数据库中存储的 Timestamp 字段的 unix_timestamp() 值比真实值少了 13 个小时。通过调试追踪，发现了 com.mysql.cj.jdbc 里的时区协商有问题。

当 JDBC 与 MySQL 开始建立连接时，会调用 com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer() 获取服务器参数，其中我们看到调用 this.session.configureTimezone() 函数，它负责配置时区。

public void configureTimezone() {

String configuredTimeZoneOnServer = getServerVariable("time_zone");

if ("SYSTEM".equalsIgnoreCase(configuredTimeZoneOnServer)) {

configuredTimeZoneOnServer = getServerVariable("system_time_zone");

}

String canonicalTimezone = getPropertySet().getStringReadableProperty(PropertyDefinitions.PNAME_serverTimezone).getValue();

if (configuredTimeZoneOnServer != null) {

// user can override this with driver properties, so don't detect if that's the case

if (canonicalTimezone == null || StringUtils.isEmptyOrWhitespaceOnly(canonicalTimezone)) {

try {

canonicalTimezone = TimeUtil.getCanonicalTimezone(configuredTimeZoneOnServer, getExceptionInterceptor());

} catch (IllegalArgumentException iae) {

throw ExceptionFactory.createException(WrongArgumentException.class, iae.getMessage(), getExceptionInterceptor());

}

}

}

if (canonicalTimezone != null && canonicalTimezone.length() > 0) {

this.serverTimezoneTZ = TimeZone.getTimeZone(canonicalTimezone);

// The Calendar class has the behavior of mapping unknown timezones to 'GMT' instead of throwing an exception, so we must check for this...

if (!canonicalTimezone.equalsIgnoreCase("GMT")

&& this.serverTimezoneTZ.getID().equals("GMT")) {

throw ...

}

}

this.defaultTimeZone = this.serverTimezoneTZ;

}

追踪代码可知，当 MySQL 的 time_zone 值为 SYSTEM 时，会取 system_time_zone 值作为协调时区。

让我们登录到 MySQL 服务器验证这两个值：

mysql> show variables like '%time_zone%';

+------------------+--------+

| Variable_name | Value |

+------------------+--------+

| system_time_zone | CST |

| time_zone | SYSTEM |

+------------------+--------+

2 rows in set (0.00 sec)

重点在这里！若 String configuredTimeZoneOnServer 得到的是 CST 那么 Java 会误以为这是 CST -0500 ，因此 TimeZone.getTimeZone(canonicalTimezone) 会给出错误的时区信息。

debug variables

如图所示，本机默认时区是 Asia/Shanghai +0800 ，误认为服务器时区为 CST -0500 ，实际上服务器是 CST +0800 。

我们会想到，即便时区有误解，如果 Timestamp 是以 long 表示的时间戳传输，也不会出现问题，下面让我们追踪到 com.mysql.cj.jdbc.PreparedStatement.setTimestamp() 。

public void setTimestamp(int parameterIndex, Timestamp x) throws java.sql.SQLException {

synchronized (checkClosed().getConnectionMutex()) {

setTimestampInternal(parameterIndex, x, this.session.getDefaultTimeZone());

}

}

注意到这里 this.session.getDefaultTimeZone() 得到的是刚才那个 CST -0500 。

private void setTimestampInternal(int parameterIndex, Timestamp x, TimeZone tz) throws SQLException {

if (x == null) {

setNull(parameterIndex, MysqlType.TIMESTAMP);

} else {

if (!this.sendFractionalSeconds.getValue()) {

x = TimeUtil.truncateFractionalSeconds(x);

}

this.parameterTypes[parameterIndex - 1 + getParameterIndexOffset()] = MysqlType.TIMESTAMP;

if (this.tsdf == null) {

this.tsdf = new SimpleDateFormat("''yyyy-MM-dd HH:mm:ss", Locale.US);

}

this.tsdf.setTimeZone(tz);

StringBuffer buf = new StringBuffer();

buf.append(this.tsdf.format(x));

if (this.session.serverSupportsFracSecs()) {

buf.append('.');

buf.append(TimeUtil.formatNanos(x.getNanos(), true));

}

buf.append('\'');

setInternal(parameterIndex, buf.toString());

}

}

原来 Timestamp 被转换为会话时区的时间字符串了。问题到此已然明晰：

JDBC 误认为会话时区在 CST-5

JBDC 把 Timestamp+0 转为 CST-5 的 String-5

MySQL 认为会话时区在 CST+8，将 String-5 转为 Timestamp-13

最终结果相差 13 个小时！如果处在冬令时还会相差 14 个小时！

解决方案

解决办法也很简单，明确指定 MySQL 数据库的时区，不使用引发误解的 CST ：

mysql> set global time_zone = '+08:00';

Query OK, 0 rows affected (0.00 sec)

mysql> set time_zone = '+08:00';

Query OK, 0 rows affected (0.00 sec)

或者修改 my.cnf 文件，在 [mysqld] 节下增加 default-time-zone = '+08:00' 。

修改时区操作影响深远，需要重启 MySQL 服务器，建议在维护时间进行。

===============================================================

另一份解决方案:

最近遇到了一个问题，java从mysql从读出的时间与本地时间有14个小时的时间差，经查证、测试解决了此问题，在此总结一下：

一、使用mysql-connector-java 6.x版本驱动需要做如下配置：

1、引入pom

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mysql

mysql-connector-java

6.0.6

2、设置jdbc连接、驱动

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jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&serverTimezone=UTC&characterEncoding=utf-8&allowMultiQueries=true

com.mysql.cj.jdbc.Driver

二、设置mysql数据时区

1、查看mysql时区

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show variableslike "%time_zone%"

2、修改mysql时区

(1)方法一

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set global time_zone ='+8:00'; ##修改mysql全局时区为北京时间，即我们所在的东8区

set time_zone ='+8:00'; ##修改当前会话时区

flushprivileges; #立即生效

(2)方法二、通过修改my.cnf配置文件来修改时区

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# vim /etc/my.cnf ##在[mysqld]区域中加上

default-time_zone ='+8:00'

# /etc/init.d/mysqld restart ##重启mysql使新时区生效

三、分析时区设置问题

通过上面的设置，我们把mysql数据库的时区设置成了中国的时区‘utc+8’，而serverTimezone=UTC设置的是utc时区，两者不同，所以会发现从数据库读出的时间与本地时间差几个小时。要解决这个问题，需要让serverTimezone的设置与数据库的时区保持一致。我们可以选择修改serverTimezone的设置为serverTimezone=Asia/Shanghai，或者修改数据库的时区为‘+0:00’。

四、serverTimezone支持的值说明

1、utc时区：serverTimezone=UTC

2、中国时区：serverTimezone=GMT%2B8(GMT+8这种方式支持全部时区，通过修改最后的数字实现，不过%2B不能写成+)

3、查看官方源码，可以看到serverTimezone支持的相关设置如下，如：中国的时区可设置为：serverTimezone=Asia/Shanghai

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#Windows Zones

#Mon Sep 28 16:41:59 WEST 2015

AUS\ Central\ Daylight\ Time=Australia/Darwin

AUS\ Central\ Standard\ Time=Australia/Darwin

AUS\ Eastern\ Daylight\ Time=Australia/Sydney

AUS\ Eastern\ Standard\ Time=Australia/Sydney

Afghanistan\ Daylight\ Time=Asia/Kabul

Afghanistan\ Standard\ Time=Asia/Kabul

Alaskan\ Daylight\ Time=America/Anchorage

Alaskan\ Standard\ Time=America/Anchorage

Arab\ Daylight\ Time=Asia/Riyadh

Arab\ Standard\ Time=Asia/Riyadh

Arabian\ Daylight\ Time=Asia/Dubai

Arabian\ Standard\ Time=Asia/Dubai

Arabic\ Daylight\ Time=Asia/Baghdad

Arabic\ Standard\ Time=Asia/Baghdad

Argentina\ Daylight\ Time=America/Buenos_Aires

Argentina\ Standard\ Time=America/Buenos_Aires

Atlantic\ Daylight\ Time=America/Halifax

Atlantic\ Standard\ Time=America/Halifax

Azerbaijan\ Daylight\ Time=Asia/Baku

Azerbaijan\ Standard\ Time=Asia/Baku

Azores\ Daylight\ Time=Atlantic/Azores

Azores\ Standard\ Time=Atlantic/Azores

Bahia\ Daylight\ Time=America/Bahia

Bahia\ Standard\ Time=America/Bahia

Bangladesh\ Daylight\ Time=Asia/Dhaka

Bangladesh\ Standard\ Time=Asia/Dhaka

Belarus\ Daylight\ Time=Europe/Minsk

Belarus\ Standard\ Time=Europe/Minsk

Canada\ Central\ Daylight\ Time=America/Regina

Canada\ Central\ Standard\ Time=America/Regina

Cape\ Verde\ Daylight\ Time=Atlantic/Cape_Verde

Cape\ Verde\ Standard\ Time=Atlantic/Cape_Verde

Caucasus\ Daylight\ Time=Asia/Yerevan

Caucasus\ Standard\ Time=Asia/Yerevan

Cen.\ Australia\ Daylight\ Time=Australia/Adelaide

Cen.\ Australia\ Standard\ Time=Australia/Adelaide

Central\ America\ Daylight\ Time=America/Guatemala

Central\ America\ Standard\ Time=America/Guatemala

Central\ Asia\ Daylight\ Time=Asia/Almaty

Central\ Asia\ Standard\ Time=Asia/Almaty

Central\ Brazilian\ Daylight\ Time=America/Cuiaba

Central\ Brazilian\ Standard\ Time=America/Cuiaba

Central\ Daylight\ Time=America/Chicago

Central\ Daylight\ Time\ (Mexico)=America/Mexico_City

Central\ Europe\ Daylight\ Time=Europe/Budapest

Central\ Europe\ Standard\ Time=Europe/Budapest

Central\ European\ Daylight\ Time=Europe/Warsaw

Central\ European\ Standard\ Time=Europe/Warsaw

Central\ Pacific\ Daylight\ Time=Pacific/Guadalcanal

Central\ Pacific\ Standard\ Time=Pacific/Guadalcanal

Central\ Standard\ Time=America/Chicago

Central\ Standard\ Time\ (Mexico)=America/Mexico_City

China\ Daylight\ Time=Asia/Shanghai

China\ Standard\ Time=Asia/Shanghai

Dateline\ Daylight\ Time=Etc/GMT+12

Dateline\ Standard\ Time=Etc/GMT+12

E.\ Africa\ Daylight\ Time=Africa/Nairobi

E.\ Africa\ Standard\ Time=Africa/Nairobi

E.\ Australia\ Daylight\ Time=Australia/Brisbane

E.\ Australia\ Standard\ Time=Australia/Brisbane

E.\ South\ America\ Daylight\ Time=America/Sao_Paulo

E.\ South\ America\ Standard\ Time=America/Sao_Paulo

Eastern\ Daylight\ Time=America/New_York

Eastern\ Daylight\ Time\ (Mexico)=America/Cancun

Eastern\ Standard\ Time=America/New_York

Eastern\ Standard\ Time\ (Mexico)=America/Cancun

Egypt\ Daylight\ Time=Africa/Cairo

Egypt\ Standard\ Time=Africa/Cairo

Ekaterinburg\ Daylight\ Time=Asia/Yekaterinburg

Ekaterinburg\ Standard\ Time=Asia/Yekaterinburg

FLE\ Daylight\ Time=Europe/Kiev

FLE\ Standard\ Time=Europe/Kiev

Fiji\ Daylight\ Time=Pacific/Fiji

Fiji\ Standard\ Time=Pacific/Fiji

GMT\ Daylight\ Time=Europe/London

GMT\ Standard\ Time=Europe/London

GTB\ Daylight\ Time=Europe/Bucharest

GTB\ Standard\ Time=Europe/Bucharest

Georgian\ Daylight\ Time=Asia/Tbilisi

Georgian\ Standard\ Time=Asia/Tbilisi

Greenland\ Daylight\ Time=America/Godthab

Greenland\ Standard\ Time=America/Godthab

Greenwich\ Daylight\ Time=Atlantic/Reykjavik

Greenwich\ Standard\ Time=Atlantic/Reykjavik

Hawaiian\ Daylight\ Time=Pacific/Honolulu

Hawaiian\ Standard\ Time=Pacific/Honolulu

India\ Daylight\ Time=Asia/Calcutta

India\ Standard\ Time=Asia/Calcutta

Iran\ Daylight\ Time=Asia/Tehran

Iran\ Standard\ Time=Asia/Tehran

Israel\ Daylight\ Time=Asia/Jerusalem

Israel\ Standard\ Time=Asia/Jerusalem

Jordan\ Daylight\ Time=Asia/Amman

Jordan\ Standard\ Time=Asia/Amman

Kaliningrad\ Daylight\ Time=Europe/Kaliningrad

Kaliningrad\ Standard\ Time=Europe/Kaliningrad

Korea\ Daylight\ Time=Asia/Seoul

Korea\ Standard\ Time=Asia/Seoul

Libya\ Daylight\ Time=Africa/Tripoli

Libya\ Standard\ Time=Africa/Tripoli

Line\ Islands\ Daylight\ Time=Pacific/Kiritimati

Line\ Islands\ Standard\ Time=Pacific/Kiritimati

Magadan\ Daylight\ Time=Asia/Magadan

Magadan\ Standard\ Time=Asia/Magadan

Mauritius\ Daylight\ Time=Indian/Mauritius

Mauritius\ Standard\ Time=Indian/Mauritius

Middle\ East\ Daylight\ Time=Asia/Beirut

Middle\ East\ Standard\ Time=Asia/Beirut

Montevideo\ Daylight\ Time=America/Montevideo

Montevideo\ Standard\ Time=America/Montevideo

Morocco\ Daylight\ Time=Africa/Casablanca

Morocco\ Standard\ Time=Africa/Casablanca

Mountain\ Daylight\ Time=America/Denver

Mountain\ Daylight\ Time\ (Mexico)=America/Chihuahua

Mountain\ Standard\ Time=America/Denver

Mountain\ Standard\ Time\ (Mexico)=America/Chihuahua

Myanmar\ Daylight\ Time=Asia/Rangoon

Myanmar\ Standard\ Time=Asia/Rangoon

N.\ Central\ Asia\ Daylight\ Time=Asia/Novosibirsk

N.\ Central\ Asia\ Standard\ Time=Asia/Novosibirsk

Namibia\ Daylight\ Time=Africa/Windhoek

Namibia\ Standard\ Time=Africa/Windhoek

Nepal\ Daylight\ Time=Asia/Katmandu

Nepal\ Standard\ Time=Asia/Katmandu

New\ Zealand\ Daylight\ Time=Pacific/Auckland

New\ Zealand\ Standard\ Time=Pacific/Auckland

Newfoundland\ Daylight\ Time=America/St_Johns

Newfoundland\ Standard\ Time=America/St_Johns

North\ Asia\ Daylight\ Time=Asia/Krasnoyarsk

North\ Asia\ East\ Daylight\ Time=Asia/Irkutsk

North\ Asia\ East\ Standard\ Time=Asia/Irkutsk

North\ Asia\ Standard\ Time=Asia/Krasnoyarsk

Pacific\ Daylight\ Time=America/Los_Angeles

Pacific\ Daylight\ Time\ (Mexico)=America/Santa_Isabel

Pacific\ SA\ Daylight\ Time=America/Santiago

Pacific\ SA\ Standard\ Time=America/Santiago

Pacific\ Standard\ Time=America/Los_Angeles

Pacific\ Standard\ Time\ (Mexico)=America/Santa_Isabel

Pakistan\ Daylight\ Time=Asia/Karachi

Pakistan\ Standard\ Time=Asia/Karachi

Paraguay\ Daylight\ Time=America/Asuncion

Paraguay\ Standard\ Time=America/Asuncion

Romance\ Daylight\ Time=Europe/Paris

Romance\ Standard\ Time=Europe/Paris

Russia\ Time\ Zone\ 10=Asia/Srednekolymsk

Russia\ Time\ Zone\ 11=Asia/Kamchatka

Russia\ Time\ Zone\ 3=Europe/Samara

Russian\ Daylight\ Time=Europe/Moscow

Russian\ Standard\ Time=Europe/Moscow

SA\ Eastern\ Daylight\ Time=America/Cayenne

SA\ Eastern\ Standard\ Time=America/Cayenne

SA\ Pacific\ Daylight\ Time=America/Bogota

SA\ Pacific\ Standard\ Time=America/Bogota

SA\ Western\ Daylight\ Time=America/La_Paz

SA\ Western\ Standard\ Time=America/La_Paz

SE\ Asia\ Daylight\ Time=Asia/Bangkok

SE\ Asia\ Standard\ Time=Asia/Bangkok

Samoa\ Daylight\ Time=Pacific/Apia

Samoa\ Standard\ Time=Pacific/Apia

Singapore\ Daylight\ Time=Asia/Singapore

Singapore\ Standard\ Time=Asia/Singapore

South\ Africa\ Daylight\ Time=Africa/Johannesburg

South\ Africa\ Standard\ Time=Africa/Johannesburg

Sri\ Lanka\ Daylight\ Time=Asia/Colombo

Sri\ Lanka\ Standard\ Time=Asia/Colombo

Syria\ Daylight\ Time=Asia/Damascus

Syria\ Standard\ Time=Asia/Damascus

Taipei\ Daylight\ Time=Asia/Taipei

Taipei\ Standard\ Time=Asia/Taipei

Tasmania\ Daylight\ Time=Australia/Hobart

Tasmania\ Standard\ Time=Australia/Hobart

Tokyo\ Daylight\ Time=Asia/Tokyo

Tokyo\ Standard\ Time=Asia/Tokyo

Tonga\ Daylight\ Time=Pacific/Tongatapu

Tonga\ Standard\ Time=Pacific/Tongatapu

Turkey\ Daylight\ Time=Europe/Istanbul

Turkey\ Standard\ Time=Europe/Istanbul

US\ Eastern\ Daylight\ Time=America/Indianapolis

US\ Eastern\ Standard\ Time=America/Indianapolis

US\ Mountain\ Daylight\ Time=America/Phoenix

US\ Mountain\ Standard\ Time=America/Phoenix

UTC=Etc/GMT

UTC+12=Etc/GMT-12

UTC-02=Etc/GMT+2

UTC-11=Etc/GMT+11

Ulaanbaatar\ Daylight\ Time=Asia/Ulaanbaatar

Ulaanbaatar\ Standard\ Time=Asia/Ulaanbaatar

Venezuela\ Daylight\ Time=America/Caracas

Venezuela\ Standard\ Time=America/Caracas

Vladivostok\ Daylight\ Time=Asia/Vladivostok

Vladivostok\ Standard\ Time=Asia/Vladivostok

W.\ Australia\ Daylight\ Time=Australia/Perth

W.\ Australia\ Standard\ Time=Australia/Perth

W.\ Central\ Africa\ Daylight\ Time=Africa/Lagos

W.\ Central\ Africa\ Standard\ Time=Africa/Lagos

W.\ Europe\ Daylight\ Time=Europe/Berlin

W.\ Europe\ Standard\ Time=Europe/Berlin

West\ Asia\ Daylight\ Time=Asia/Tashkent

West\ Asia\ Standard\ Time=Asia/Tashkent

West\ Pacific\ Daylight\ Time=Pacific/Port_Moresby

West\ Pacific\ Standard\ Time=Pacific/Port_Moresby

Yakutsk\ Daylight\ Time=Asia/Yakutsk

Yakutsk\ Standard\ Time=Asia/Yakutsk

#Linked Time Zones alias

#Mon Sep 28 16:41:59 WEST 2015

Africa/Addis_Ababa=Africa/Nairobi

Africa/Asmara=Africa/Nairobi

Africa/Asmera=Africa/Nairobi

Africa/Bamako=Africa/Abidjan

Africa/Bangui=Africa/Lagos

Africa/Banjul=Africa/Abidjan

Africa/Blantyre=Africa/Maputo

Africa/Brazzaville=Africa/Lagos

Africa/Bujumbura=Africa/Maputo

Africa/Conakry=Africa/Abidjan

Africa/Dakar=Africa/Abidjan

Africa/Dar_es_Salaam=Africa/Nairobi

Africa/Djibouti=Africa/Nairobi

Africa/Douala=Africa/Lagos

Africa/Freetown=Africa/Abidjan

Africa/Gaborone=Africa/Maputo

Africa/Harare=Africa/Maputo

Africa/Juba=Africa/Khartoum

Africa/Kampala=Africa/Nairobi

Africa/Kigali=Africa/Maputo

Africa/Kinshasa=Africa/Lagos

Africa/Libreville=Africa/Lagos

Africa/Lome=Africa/Abidjan

Africa/Luanda=Africa/Lagos

Africa/Lubumbashi=Africa/Maputo

Africa/Lusaka=Africa/Maputo

Africa/Malabo=Africa/Lagos

Africa/Maseru=Africa/Johannesburg

Africa/Mbabane=Africa/Johannesburg

Africa/Mogadishu=Africa/Nairobi

Africa/Niamey=Africa/Lagos

Africa/Nouakchott=Africa/Abidjan

Africa/Ouagadougou=Africa/Abidjan

Africa/Porto-Novo=Africa/Lagos

Africa/Sao_Tome=Africa/Abidjan

Africa/Timbuktu=Africa/Abidjan

America/Anguilla=America/Port_of_Spain

America/Antigua=America/Port_of_Spain

America/Argentina/ComodRivadavia=America/Argentina/Catamarca

America/Aruba=America/Curacao

America/Atka=America/Adak

America/Buenos_Aires=America/Argentina/Buenos_Aires

America/Catamarca=America/Argentina/Catamarca

America/Coral_Harbour=America/Atikokan

America/Cordoba=America/Argentina/Cordoba

America/Dominica=America/Port_of_Spain

America/Ensenada=America/Tijuana

America/Fort_Wayne=America/Indiana/Indianapolis

America/Grenada=America/Port_of_Spain

America/Guadeloupe=America/Port_of_Spain

America/Indianapolis=America/Indiana/Indianapolis

America/Jujuy=America/Argentina/Jujuy

America/Knox_IN=America/Indiana/Knox

America/Kralendijk=America/Curacao

America/Louisville=America/Kentucky/Louisville

America/Lower_Princes=America/Curacao

America/Marigot=America/Port_of_Spain

America/Mendoza=America/Argentina/Mendoza

America/Montreal=America/Toronto

America/Montserrat=America/Port_of_Spain

America/Porto_Acre=America/Rio_Branco

America/Rosario=America/Argentina/Cordoba

America/Shiprock=America/Denver

America/St_Barthelemy=America/Port_of_Spain

America/St_Kitts=America/Port_of_Spain

America/St_Lucia=America/Port_of_Spain

America/St_Thomas=America/Port_of_Spain

America/St_Vincent=America/Port_of_Spain

America/Tortola=America/Port_of_Spain

America/Virgin=America/Port_of_Spain

Antarctica/McMurdo=Pacific/Auckland

Antarctica/South_Pole=Pacific/Auckland

Arctic/Longyearbyen=Europe/Oslo

Asia/Aden=Asia/Riyadh

Asia/Ashkhabad=Asia/Ashgabat

Asia/Bahrain=Asia/Qatar

Asia/Calcutta=Asia/Kolkata

Asia/Chongqing=Asia/Shanghai

Asia/Chungking=Asia/Shanghai

Asia/Dacca=Asia/Dhaka

Asia/Harbin=Asia/Shanghai

Asia/Istanbul=Europe/Istanbul

Asia/Kashgar=Asia/Urumqi

Asia/Katmandu=Asia/Kathmandu

Asia/Kuwait=Asia/Riyadh

Asia/Macao=Asia/Macau

Asia/Muscat=Asia/Dubai

Asia/Phnom_Penh=Asia/Bangkok

Asia/Saigon=Asia/Ho_Chi_Minh

Asia/Tel_Aviv=Asia/Jerusalem

Asia/Thimbu=Asia/Thimphu

Asia/Ujung_Pandang=Asia/Makassar

Asia/Ulan_Bator=Asia/Ulaanbaatar

Asia/Vientiane=Asia/Bangkok

Atlantic/Faeroe=Atlantic/Faroe

Atlantic/Jan_Mayen=Europe/Oslo

Atlantic/St_Helena=Africa/Abidjan

Australia/ACT=Australia/Sydney

Australia/Canberra=Australia/Sydney

Australia/LHI=Australia/Lord_Howe

Australia/NSW=Australia/Sydney

Australia/North=Australia/Darwin

Australia/Queensland=Australia/Brisbane

Australia/South=Australia/Adelaide

Australia/Tasmania=Australia/Hobart

Australia/Victoria=Australia/Melbourne

Australia/West=Australia/Perth

Australia/Yancowinna=Australia/Broken_Hill

Brazil/Acre=America/Rio_Branco

Brazil/DeNoronha=America/Noronha

Brazil/East=America/Sao_Paulo

Brazil/West=America/Manaus

Canada/Atlantic=America/Halifax

Canada/Central=America/Winnipeg

Canada/East-Saskatchewan=America/Regina

Canada/Eastern=America/Toronto

Canada/Mountain=America/Edmonton

Canada/Newfoundland=America/St_Johns

Canada/Pacific=America/Vancouver

Canada/Saskatchewan=America/Regina

Canada/Yukon=America/Whitehorse

Chile/Continental=America/Santiago

Chile/EasterIsland=Pacific/Easter

Cuba=America/Havana

Egypt=Africa/Cairo

Eire=Europe/Dublin

Europe/Belfast=Europe/London

Europe/Bratislava=Europe/Prague

Europe/Busingen=Europe/Zurich

Europe/Guernsey=Europe/London

Europe/Isle_of_Man=Europe/London

Europe/Jersey=Europe/London

Europe/Ljubljana=Europe/Belgrade

Europe/Mariehamn=Europe/Helsinki

Europe/Nicosia=Asia/Nicosia

Europe/Podgorica=Europe/Belgrade

Europe/San_Marino=Europe/Rome

Europe/Sarajevo=Europe/Belgrade

Europe/Skopje=Europe/Belgrade

Europe/Tiraspol=Europe/Chisinau

Europe/Vaduz=Europe/Zurich

Europe/Vatican=Europe/Rome

Europe/Zagreb=Europe/Belgrade

GB=Europe/London

GB-Eire=Europe/London

GMT+0=Etc/GMT

GMT-0=Etc/GMT

GMT0=Etc/GMT

Greenwich=Etc/GMT

Hongkong=Asia/Hong_Kong

Iceland=Atlantic/Reykjavik

Indian/Antananarivo=Africa/Nairobi

Indian/Comoro=Africa/Nairobi

Indian/Mayotte=Africa/Nairobi

Iran=Asia/Tehran

Israel=Asia/Jerusalem

Jamaica=America/Jamaica

Japan=Asia/Tokyo

Kwajalein=Pacific/Kwajalein

Libya=Africa/Tripoli

Mexico/BajaNorte=America/Tijuana

Mexico/BajaSur=America/Mazatlan

Mexico/General=America/Mexico_City

NZ=Pacific/Auckland

NZ-CHAT=Pacific/Chatham

Navajo=America/Denver

PRC=Asia/Shanghai

Pacific/Johnston=Pacific/Honolulu

Pacific/Midway=Pacific/Pago_Pago

Pacific/Ponape=Pacific/Pohnpei

Pacific/Saipan=Pacific/Guam

Pacific/Samoa=Pacific/Pago_Pago

Pacific/Truk=Pacific/Chuuk

Pacific/Yap=Pacific/Chuuk

Poland=Europe/Warsaw

Portugal=Europe/Lisbon

ROC=Asia/Taipei

ROK=Asia/Seoul

Singapore=Asia/Singapore

Turkey=Europe/Istanbul

UCT=Etc/UCT

US/Alaska=America/Anchorage

US/Aleutian=America/Adak

US/Arizona=America/Phoenix

US/Central=America/Chicago

US/East-Indiana=America/Indiana/Indianapolis

US/Eastern=America/New_York

US/Hawaii=Pacific/Honolulu

US/Indiana-Starke=America/Indiana/Knox

US/Michigan=America/Detroit

US/Mountain=America/Denver

US/Pacific=America/Los_Angeles

US/Pacific-New=America/Los_Angeles

US/Samoa=Pacific/Pago_Pago

Universal=Etc/UTC

W-SU=Europe/Moscow

Zulu=Etc/UTC

#Standard (IANA) abbreviations

#Mon Sep 28 16:41:59 WEST 2015

ACWST=Australia/Eucla

AFT=Asia/Kabul

ALMT=Asia/Almaty

ANAT=Asia/Anadyr

AZOST=Atlantic/Azores

AZOT=Atlantic/Azores

AZST=Asia/Baku

AZT=Asia/Baku

BDT=Asia/Dhaka

BNT=Asia/Brunei

BOT=America/La_Paz

BRST=America/Sao_Paulo

BTT=Asia/Thimphu

CAT=Africa/Maputo

CCT=Indian/Cocos

CHADT=Pacific/Chatham

CHAST=Pacific/Chatham

CHOST=Asia/Choibalsan

CHOT=Asia/Choibalsan

CHUT=Pacific/Chuuk

CKT=Pacific/Rarotonga

COT=America/Bogota

CVT=Atlantic/Cape_Verde

CXT=Indian/Christmas

ChST=Pacific/Guam

DAVT=Antarctica/Davis

DDUT=Antarctica/DumontDUrville

EAST=Pacific/Easter

ECT=America/Guayaquil

EGST=America/Scoresbysund

EGT=America/Scoresbysund

FJST=Pacific/Fiji

FJT=Pacific/Fiji

FKST=Atlantic/Stanley

FNT=America/Noronha

GALT=Pacific/Galapagos

GAMT=Pacific/Gambier

GET=Asia/Tbilisi

GFT=America/Cayenne

GILT=Pacific/Tarawa

GYT=America/Guyana

HDT=America/Adak

HKT=Asia/Hong_Kong

HOVST=Asia/Hovd

HOVT=Asia/Hovd

IDT=Asia/Jerusalem

IOT=Indian/Chagos

IRST=Asia/Tehran

JST=Asia/Tokyo

KGT=Asia/Bishkek

KOST=Pacific/Kosrae

LHDT=Australia/Lord_Howe

LHST=Australia/Lord_Howe

LINT=Pacific/Kiritimati

MAGT=Asia/Magadan

MART=Pacific/Marquesas

MAWT=Antarctica/Mawson

MEST=MET

MET=MET

MIST=Antarctica/Macquarie

MMT=Asia/Rangoon

MUT=Indian/Mauritius

MVT=Indian/Maldives

NCT=Pacific/Noumea

NDT=America/St_Johns

NFT=Pacific/Norfolk

NOVT=Asia/Novosibirsk

NPT=Asia/Kathmandu

NRT=Pacific/Nauru

NST=America/St_Johns

NUT=Pacific/Niue

NZDT=Pacific/Auckland

NZST=Pacific/Auckland

OMST=Asia/Omsk

ORAT=Asia/Oral

PET=America/Lima

PETT=Asia/Kamchatka

PGT=Pacific/Port_Moresby

PHOT=Pacific/Enderbury

PHT=Asia/Manila

PKT=Asia/Karachi

PMDT=America/Miquelon

PMST=America/Miquelon

PONT=Pacific/Pohnpei

PWT=Pacific/Palau

PYST=America/Asuncion

PYT=America/Asuncion

QYZT=Asia/Qyzylorda

RET=Indian/Reunion

ROTT=Antarctica/Rothera

SAKT=Asia/Sakhalin

SAMT=Europe/Samara

SAST=Africa/Johannesburg

SBT=Pacific/Guadalcanal

SCT=Indian/Mahe

SGT=Asia/Singapore

SRET=Asia/Srednekolymsk

SRT=America/Paramaribo

SST=Pacific/Pago_Pago

SYOT=Antarctica/Syowa

TAHT=Pacific/Tahiti

TFT=Indian/Kerguelen

TJT=Asia/Dushanbe

TKT=Pacific/Fakaofo

TLT=Asia/Dili

TMT=Asia/Ashgabat

TOT=Pacific/Tongatapu

TVT=Pacific/Funafuti

ULAST=Asia/Ulaanbaatar

ULAT=Asia/Ulaanbaatar

UYT=America/Montevideo

VET=America/Caracas

VOST=Antarctica/Vostok

VUT=Pacific/Efate

WAKT=Pacific/Wake

WAST=Africa/Windhoek

WFT=Pacific/Wallis

WGST=America/Godthab

WGT=America/Godthab

WIT=Asia/Jayapura

WITA=Asia/Makassar

WSDT=Pacific/Apia

WSST=Pacific/Apia

XJT=Asia/Urumqi

YEKT=Asia/Yekaterinburg

以上内容在src\main\resources\com\mysql\cj\jdbc\util.TimeZoneMapping.properties，

= 后面的值为我们可以用来设置的值