Timezone Abbreviations — Complete Reference Guide

A comprehensive reference of all major timezone abbreviations, organised by region. Click any abbreviation to see the live current time, UTC offset, countries observed, and more.

Americas Europe Asia-Pacific Africa / Middle East

Americas

Abbr	Full Name	UTC Offset	Countries / Notes	Type
EST	Eastern Standard Time	UTC-5	United States, Canada, Mexico (Quintana Roo)	STD
EDT	Eastern Daylight Time	UTC-4	United States, Canada	DST
CST	Central Standard Time	UTC-6	United States, Canada, Mexico	STD
CDT	Central Daylight Time	UTC-5	United States, Canada	DST
MST	Mountain Standard Time	UTC-7	United States, Canada, Mexico	STD
MDT	Mountain Daylight Time	UTC-6	United States, Canada	DST
PST	Pacific Standard Time	UTC-8	United States, Canada	STD
PDT	Pacific Daylight Time	UTC-7	United States, Canada	DST
AKST	Alaska Standard Time	UTC-9	United States	STD
AKDT	Alaska Daylight Time	UTC-8	United States	DST
HST	Hawaii–Aleutian Standard Time	UTC-10	United States	STD
AST	Atlantic Standard Time	UTC-4	Canada, Caribbean islands	STD
NST	Newfoundland Standard Time	UTC-3:30	Canada	STD
BRT	Brasilia Time	UTC-3	Brazil	STD
ART	Argentina Time	UTC-3	Argentina	STD
CLT	Chile Standard Time	UTC-4	Chile	STD
CLST	Chile Summer Time	UTC-3	Chile	DST
PET	Peru Time	UTC-5	Peru	STD
COT	Colombia Time	UTC-5	Colombia	STD

ESTUTC-5STD

Eastern Standard Time

United States, Canada +1 more

EDTUTC-4DST

Eastern Daylight Time

United States, Canada

CSTUTC-6STD

Central Standard Time

United States, Canada +1 more

CDTUTC-5DST

Central Daylight Time

United States, Canada

MSTUTC-7STD

Mountain Standard Time

United States, Canada +1 more

MDTUTC-6DST

Mountain Daylight Time

United States, Canada

PSTUTC-8STD

Pacific Standard Time

United States, Canada

PDTUTC-7DST

Pacific Daylight Time

United States, Canada

AKSTUTC-9STD

Alaska Standard Time

United States

AKDTUTC-8DST

Alaska Daylight Time

United States

HSTUTC-10STD

Hawaii–Aleutian Standard Time

United States

ASTUTC-4STD

Atlantic Standard Time

Canada, Caribbean islands

NSTUTC-3:30STD

Newfoundland Standard Time

Canada

BRTUTC-3STD

Brasilia Time

Brazil

ARTUTC-3STD

Argentina Time

Argentina

CLTUTC-4STD

Chile Standard Time

Chile

CLSTUTC-3DST

Chile Summer Time

Chile

PETUTC-5STD

Peru Time

Peru

COTUTC-5STD

Colombia Time

Colombia

Europe

Abbr	Full Name	UTC Offset	Countries / Notes	Type
GMT	Greenwich Mean Time	UTC+0	United Kingdom, Ireland, Portugal +1 more	STD
UTC	Coordinated Universal Time	UTC+0	International standard	STD
BST	British Summer Time	UTC+1	United Kingdom	DST
CET	Central European Time	UTC+1	France, Germany, Italy +8 more	STD
CEST	Central European Summer Time	UTC+2	France, Germany, Italy +8 more	DST
EET	Eastern European Time	UTC+2	Finland, Greece, Romania +5 more	STD
EEST	Eastern European Summer Time	UTC+3	Finland, Greece, Romania +5 more	DST
WET	Western European Time	UTC+0	Portugal, Canary Islands (Spain), Morocco (in winter)	STD
WEST	Western European Summer Time	UTC+1	Portugal, Canary Islands (Spain)	DST
MSK	Moscow Standard Time	UTC+3	Russia	STD

GMTUTC+0STD

Greenwich Mean Time

United Kingdom, Ireland +2 more

UTCUTC+0STD

Coordinated Universal Time

International standard

BSTUTC+1DST

British Summer Time

United Kingdom

CETUTC+1STD

Central European Time

France, Germany +9 more

CESTUTC+2DST

Central European Summer Time

France, Germany +9 more

EETUTC+2STD

Eastern European Time

Finland, Greece +6 more

EESTUTC+3DST

Eastern European Summer Time

Finland, Greece +6 more

WETUTC+0STD

Western European Time

Portugal, Canary Islands (Spain) +1 more

WESTUTC+1DST

Western European Summer Time

Portugal, Canary Islands (Spain)

MSKUTC+3STD

Moscow Standard Time

Russia

Asia-Pacific

Abbr	Full Name	UTC Offset	Countries / Notes	Type
IST	India Standard Time	UTC+5:30	India, Sri Lanka	STD
JST	Japan Standard Time	UTC+9	Japan	STD
KST	Korea Standard Time	UTC+9	South Korea, North Korea	STD
CST	China Standard Time	UTC+8	China, Taiwan	STD
HKT	Hong Kong Time	UTC+8	Hong Kong	STD
SGT	Singapore Time	UTC+8	Singapore	STD
AEST	Australian Eastern Standard Time	UTC+10	Australia	STD
AEDT	Australian Eastern Daylight Time	UTC+11	Australia	DST
NZST	New Zealand Standard Time	UTC+12	New Zealand	STD
NZDT	New Zealand Daylight Time	UTC+13	New Zealand	DST
PKT	Pakistan Standard Time	UTC+5	Pakistan	STD
NPT	Nepal Time	UTC+5:45	Nepal	STD
BST	Bangladesh Standard Time	UTC+6	Bangladesh	STD
ICT	Indochina Time	UTC+7	Thailand, Vietnam, Cambodia +1 more	STD
WIB	Western Indonesian Time	UTC+7	Indonesia	STD
WITA	Central Indonesian Time	UTC+8	Indonesia	STD
WIT	Eastern Indonesian Time	UTC+9	Indonesia	STD
GST	Gulf Standard Time	UTC+4	United Arab Emirates, Oman	STD

ISTUTC+5:30STD

India Standard Time

India, Sri Lanka

JSTUTC+9STD

Japan Standard Time

Japan

KSTUTC+9STD

Korea Standard Time

South Korea, North Korea

CSTUTC+8STD

China Standard Time

China, Taiwan

HKTUTC+8STD

Hong Kong Time

Hong Kong

SGTUTC+8STD

Singapore Time

Singapore

AESTUTC+10STD

Australian Eastern Standard Time

Australia

AEDTUTC+11DST

Australian Eastern Daylight Time

Australia

NZSTUTC+12STD

New Zealand Standard Time

New Zealand

NZDTUTC+13DST

New Zealand Daylight Time

New Zealand

PKTUTC+5STD

Pakistan Standard Time

Pakistan

NPTUTC+5:45STD

Nepal Time

Nepal

BSTUTC+6STD

Bangladesh Standard Time

Bangladesh

ICTUTC+7STD

Indochina Time

Thailand, Vietnam +2 more

WIBUTC+7STD

Western Indonesian Time

Indonesia

WITAUTC+8STD

Central Indonesian Time

Indonesia

WITUTC+9STD

Eastern Indonesian Time

Indonesia

GSTUTC+4STD

Gulf Standard Time

United Arab Emirates, Oman

Africa / Middle East

Abbr	Full Name	UTC Offset	Countries / Notes	Type
EAT	East Africa Time	UTC+3	Kenya, Tanzania, Uganda +4 more	STD
CAT	Central Africa Time	UTC+2	Zimbabwe, Zambia, Malawi +3 more	STD
WAT	West Africa Time	UTC+1	Nigeria, Cameroon, Niger +4 more	STD
SAST	South Africa Standard Time	UTC+2	South Africa, Lesotho, Swaziland	STD

EATUTC+3STD

East Africa Time

Kenya, Tanzania +5 more

CATUTC+2STD

Central Africa Time

Zimbabwe, Zambia +4 more

WATUTC+1STD

West Africa Time

Nigeria, Cameroon +5 more

SASTUTC+2STD

South Africa Standard Time

South Africa, Lesotho +1 more

Timezone Tools

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Frequently Asked Questions about Timezone Abbreviations

A timezone abbreviation is a short code (usually 2–5 letters) that represents a specific timezone offset from UTC. For example, EST stands for Eastern Standard Time (UTC−5), and JST stands for Japan Standard Time (UTC+9). Abbreviations are commonly used in schedules, email headers, and broadcast media.

GMT (Greenwich Mean Time) and UTC (Coordinated Universal Time) both represent UTC+0, but they have different origins. GMT is based on the Earth's rotation as measured at the Royal Observatory in Greenwich, London. UTC is the modern atomic-clock-based standard. For everyday purposes they are interchangeable, but UTC is the official international standard used by computers and aviation.

Several three-letter abbreviations are shared by multiple unrelated timezones. For example, CST means Central Standard Time (UTC−6) in North America, but also China Standard Time (UTC+8). Similarly, BST means British Summer Time (UTC+1) in Europe and Bangladesh Standard Time (UTC+6) in South Asia. When communicating across regions, always clarify which timezone you mean or use the UTC offset.

Standard time abbreviations (e.g., EST, PST, CET) are used during the winter months when Daylight Saving Time is not in effect. Daylight saving time abbreviations (e.g., EDT, PDT, CEST) are used during summer months when clocks are advanced by one hour. The UTC offset is one hour more during DST.

To convert between timezones, first find the UTC offset for each timezone. For example, EST is UTC−5 and IST is UTC+5:30, so IST is 10 hours and 30 minutes ahead of EST. You can also use the TimeandTool Timezone Converter for quick, accurate conversions between any two timezones.