Time Zone Abbreviations

A searchable reference of common time-zone abbreviations (EST, PST, GMT, CET, IST and more) with their full names, UTC offsets and where they’re used.

Abbr.Name and where usedOffset
UTCCoordinated Universal TimeWorldwideUTC+0:00
GMTGreenwich Mean TimeUK and Ireland (winter), Iceland, West AfricaUTC+0:00
WETWestern European TimePortugal, Canary and Faroe IslandsUTC+0:00
WESTWestern European Summer TimePortugal, Canary and Faroe Islands (DST)UTC+1:00
BSTBritish Summer TimeUnited Kingdom (DST)UTC+1:00
CETCentral European TimeCentral EuropeUTC+1:00
CESTCentral European Summer TimeCentral Europe (DST)UTC+2:00
EETEastern European TimeEastern EuropeUTC+2:00
EESTEastern European Summer TimeEastern Europe (DST)UTC+3:00
MSKMoscow Standard TimeRussia (west)UTC+3:00
ISTIndia Standard TimeIndiaUTC+5:30
ISTIsrael Standard TimeIsraelUTC+2:00
IDTIsrael Daylight TimeIsrael (DST)UTC+3:00
ISTIrish Standard TimeIreland (summer)UTC+1:00
PKTPakistan Standard TimePakistanUTC+5:00
ICTIndochina TimeThailand, VietnamUTC+7:00
CSTChina Standard TimeChinaUTC+8:00
SGTSingapore TimeSingapore, MalaysiaUTC+8:00
HKTHong Kong TimeHong KongUTC+8:00
AWSTAustralian Western Standard TimeWestern AustraliaUTC+8:00
JSTJapan Standard TimeJapanUTC+9:00
KSTKorea Standard TimeSouth KoreaUTC+9:00
ACSTAustralian Central Standard TimeSouth AustraliaUTC+9:30
AESTAustralian Eastern Standard TimeEastern AustraliaUTC+10:00
AEDTAustralian Eastern Daylight TimeEastern Australia (DST)UTC+11:00
NZSTNew Zealand Standard TimeNew ZealandUTC+12:00
NZDTNew Zealand Daylight TimeNew Zealand (DST)UTC+13:00
NSTNewfoundland Standard TimeNewfoundlandUTC−3:30
NDTNewfoundland Daylight TimeNewfoundland (DST)UTC−2:30
ASTAtlantic Standard TimeAtlantic Canada, Puerto Rico, CaribbeanUTC−4:00
ADTAtlantic Daylight TimeAtlantic Canada, Bermuda (DST)UTC−3:00
ESTEastern Standard TimeUS East, Ontario, Quebec; Manitoba year-round from Nov 2026UTC−5:00
EDTEastern Daylight TimeUS East, Ontario, Quebec (DST)UTC−4:00
CSTCentral Standard TimeUS Central, most of Mexico; Saskatchewan, and Alberta and the Northwest Territories year-round from Nov 2026UTC−6:00
CDTCentral Daylight TimeUS Central, central Nunavut (DST)UTC−5:00
CSTCuba Standard TimeCubaUTC−5:00
CDTCuba Daylight TimeCuba (DST)UTC−4:00
MSTMountain Standard TimeUS Mountain, Arizona; Yukon, and British Columbia year-round from Nov 2026UTC−7:00
MDTMountain Daylight TimeUS Mountain, western Nunavut (DST)UTC−6:00
PSTPacific Standard TimeUS Pacific, Baja CaliforniaUTC−8:00
PDTPacific Daylight TimeUS Pacific, Baja California (DST); British Columbia until 1 Nov 2026UTC−7:00
AKSTAlaska Standard TimeAlaskaUTC−9:00
AKDTAlaska Daylight TimeAlaska (DST)UTC−8:00
HSTHawaii–Aleutian Standard TimeHawaii, Aleutian IslandsUTC−10:00

How it works

Time-zone abbreviations name a fixed offset from UTC. A region usually has two (a standard one and a daylight-saving one) so the US East Coast is EST (UTC−5) in winter and EDT (UTC−4) in summer.

Abbreviations are ambiguous: CST can mean Central (US), China, or Cuba time, and IST can mean India, Israel or Irish time. When precision matters, prefer a full IANA zone like America/Chicago. This page is a static reference, nothing is sent anywhere.

Canada in 2026: British Columbia, Alberta, the Northwest Territories and Manitoba (from 31 October) have moved to permanent time: their clocks keep the summer offset all year. From 1 November 2026 the time-zone database names that offset after the zone it matches: British Columbia MST (UTC−7), Alberta and the Northwest Territories CST (UTC−6), and Manitoba EST (UTC−5). So PST, PDT, MDT and CDT no longer mean "US & Canada". This follows the IANA time-zone database, release 2026e; phones and computers with older time-zone data may still show the old abbreviations until they update.

What this does

A searchable reference of common time-zone abbreviations (EST, PST, GMT, CET, IST, and more) with their full names, UTC offsets, and where they are used.

How to use it

  1. Type an abbreviation or region.
  2. Read its full name and UTC offset.
  3. Check where it is used.
  4. Note any duplicate meanings.

Understanding your result

Abbreviations are not unique, so the same letters can mean different zones in different countries, which is exactly how scheduling mistakes happen. Use this to decode an abbreviation someone sent you, but when you set up an event yourself, specify a full IANA name like America/Chicago or a UTC offset so there is no room for ambiguity.

Example

EST is UTC−5 (US Eastern Standard Time), while its daylight-saving counterpart EDT is UTC−4.

Last updated .

Frequently asked questions

Why do some abbreviations mean more than one thing?

Abbreviations aren’t unique, CST can be US Central, China, or Cuba time, and IST can be India, Israel or Irish time. When precision matters, use a full IANA zone name like America/Chicago.

What’s the difference between standard and daylight abbreviations?

Most regions have two: a standard one (e.g. EST, UTC−5) and a daylight-saving one (EDT, UTC−4) used during summer.

Why do PST and PDT no longer cover Canada?

In 2026 British Columbia, Alberta, the Northwest Territories and Manitoba moved to permanent time. From 1 November 2026 the IANA time-zone database (release 2026e) calls British Columbia MST, Alberta and the Northwest Territories CST, and Manitoba EST, all year. Devices with older time-zone data may still show the old names until they update.

Is my data stored?

No. This is a static reference page, nothing is sent anywhere.