Time zone abbreviations

This list of time zone abbreviations covers about 200 codes used around the world, from EST and CET to IST and AEDT. Each entry gives the full name, the UTC offset, the regions that use it and whether it is a daylight saving (summer) time.

Filter abbreviations

Abbreviation	Name	Offset	Regions
A	Alpha Time Zone	UTC+1	Military
ACDT	Australian Central Daylight Time · Daylight time	UTC+10:30	Australia
ACST	Australian Central Standard Time	UTC+9:30	Australia
ACT	Acre Time	UTC−5	South America
ACWST	Australian Central Western Standard Time	UTC+8:45	Australia
ADT	Atlantic Daylight Time · Daylight time	UTC−3	North America, Atlantic, Caribbean
AEDT	Australian Eastern Daylight Time · Daylight time	UTC+11	Australia
AEST	Australian Eastern Standard Time	UTC+10	Australia
AFT	Afghanistan Time	UTC+4:30	Asia
AKDT	Alaska Daylight Time · Daylight time	UTC−8	North America
AKST	Alaska Standard Time	UTC−9	North America
AMST	Amazon Summer Time · Daylight time	UTC−3	South America
AMT	Amazon Time	UTC−4	South America
AMT	Armenia Time	UTC+4	Asia, Europe
ANAT	Anadyr Time	UTC+12	Asia
AoE	Anywhere on Earth	UTC−12	Pacific
AQTT	Aqtobe Time	UTC+5	Asia
ART	Argentina Time	UTC−3	South America
AST	Atlantic Standard Time	UTC−4	North America, Atlantic, Caribbean
AST	Arabia Standard Time	UTC+3	Asia
AWST	Australian Western Standard Time	UTC+8	Australia
AZOST	Azores Summer Time · Daylight time	UTC	Atlantic, Europe
AZOT	Azores Standard Time	UTC−1	Atlantic, Europe
AZT	Azerbaijan Time	UTC+4	Asia, Europe
B	Bravo Time Zone	UTC+2	Military
BNT	Brunei Darussalam Time	UTC+8	Asia
BOT	Bolivia Time	UTC−4	South America
BRST	Brasília Summer Time · Daylight time	UTC−2	South America
BRT	Brasília Time	UTC−3	South America
BST	British Summer Time · Daylight time	UTC+1	Europe
BST	Bangladesh Standard Time	UTC+6	Asia
BTT	Bhutan Time	UTC+6	Asia
C	Charlie Time Zone	UTC+3	Military
CAST	Casey Time	UTC+8	Antarctica
CAT	Central Africa Time	UTC+2	Africa
CCT	Cocos Islands Time	UTC+6:30	Indian Ocean, Australia
CDT	Central Daylight Time · Daylight time	UTC−5	North America
CDT	Cuba Daylight Time · Daylight time	UTC−4	Caribbean
CEST	Central European Summer Time · Daylight time	UTC+2	Europe
CET	Central European Time	UTC+1	Europe, Africa
CHADT	Chatham Island Daylight Time · Daylight time	UTC+13:45	Pacific
CHAST	Chatham Island Standard Time	UTC+12:45	Pacific
ChST	Chamorro Standard Time	UTC+10	Pacific
CHUT	Chuuk Time	UTC+10	Pacific
CKT	Cook Islands Time	UTC−10	Pacific
CLST	Chile Summer Time · Daylight time	UTC−3	South America
CLT	Chile Standard Time	UTC−4	South America
COT	Colombia Time	UTC−5	South America
CST	Central Standard Time	UTC−6	North America, Central America
CST	Cuba Standard Time	UTC−5	Caribbean
CST	China Standard Time	UTC+8	Asia
CVT	Cape Verde Time	UTC−1	Atlantic, Africa
CXT	Christmas Island Time	UTC+7	Indian Ocean, Australia
D	Delta Time Zone	UTC+4	Military
DAVT	Davis Time	UTC+7	Antarctica
DDUT	Dumont-d'Urville Time	UTC+10	Antarctica
E	Echo Time Zone	UTC+5	Military
EASST	Easter Island Summer Time · Daylight time	UTC−5	South America, Pacific
EAST	Easter Island Standard Time	UTC−6	South America, Pacific
EAT	East Africa Time	UTC+3	Africa, Indian Ocean
ECT	Ecuador Time	UTC−5	South America
EDT	Eastern Daylight Time · Daylight time	UTC−4	North America, Caribbean
EEST	Eastern European Summer Time · Daylight time	UTC+3	Europe, Africa, Asia
EET	Eastern European Time	UTC+2	Europe, Africa, Asia
EGST	East Greenland Summer Time · Daylight time	UTC	North America
EGT	East Greenland Time	UTC−1	North America
EST	Eastern Standard Time	UTC−5	North America, Caribbean, Central America
F	Foxtrot Time Zone	UTC+6	Military
FET	Further-Eastern European Time	UTC+3	Europe
FJST	Fiji Summer Time · Daylight time	UTC+13	Pacific
FJT	Fiji Time	UTC+12	Pacific
FKST	Falkland Islands Summer Time	UTC−3	South America, Atlantic
FNT	Fernando de Noronha Time	UTC−2	South America
G	Golf Time Zone	UTC+7	Military
GALT	Galápagos Time	UTC−6	South America, Pacific
GAMT	Gambier Time	UTC−9	Pacific
GET	Georgia Standard Time	UTC+4	Asia, Europe
GFT	French Guiana Time	UTC−3	South America
GILT	Gilbert Island Time	UTC+12	Pacific
GMT	Greenwich Mean Time	UTC	Europe, Africa, Atlantic
GST	South Georgia Time	UTC−2	Atlantic
GST	Gulf Standard Time	UTC+4	Asia
GYT	Guyana Time	UTC−4	South America
H	Hotel Time Zone	UTC+8	Military
HDT	Hawaii-Aleutian Daylight Time · Daylight time	UTC−9	North America, Pacific
HKT	Hong Kong Time	UTC+8	Asia
HOVT	Hovd Time	UTC+7	Asia
HST	Hawaii-Aleutian Standard Time	UTC−10	North America, Pacific
I	India Time Zone	UTC+9	Military
ICT	Indochina Time	UTC+7	Asia
IDT	Israel Daylight Time · Daylight time	UTC+3	Asia
IOT	Indian Chagos Time	UTC+6	Indian Ocean
IRDT	Iran Daylight Time · Daylight time	UTC+4:30	Asia
IRKT	Irkutsk Time	UTC+8	Asia
IRST	Iran Standard Time	UTC+3:30	Asia
IST	Irish Standard Time · Daylight time	UTC+1	Europe
IST	Israel Standard Time	UTC+2	Asia
IST	India Standard Time	UTC+5:30	Asia
JST	Japan Standard Time	UTC+9	Asia
K	Kilo Time Zone	UTC+10	Military
KALT	Kaliningrad Time	UTC+2	Europe
KGT	Kyrgyzstan Time	UTC+6	Asia
KOST	Kosrae Time	UTC+11	Pacific
KRAT	Krasnoyarsk Time	UTC+7	Asia
KST	Korea Standard Time	UTC+9	Asia
L	Lima Time Zone	UTC+11	Military
LHDT	Lord Howe Daylight Time · Daylight time	UTC+11	Australia
LHST	Lord Howe Standard Time	UTC+10:30	Australia
LINT	Line Islands Time	UTC+14	Pacific
M	Mike Time Zone	UTC+12	Military
MAGT	Magadan Time	UTC+11	Asia
MART	Marquesas Time	UTC−9:30	Pacific
MAWT	Mawson Time	UTC+5	Antarctica
MDT	Mountain Daylight Time · Daylight time	UTC−6	North America
MHT	Marshall Islands Time	UTC+12	Pacific
MMT	Myanmar Time	UTC+6:30	Asia
MSK	Moscow Standard Time	UTC+3	Europe
MST	Mountain Standard Time	UTC−7	North America
MUT	Mauritius Time	UTC+4	Indian Ocean, Africa
MVT	Maldives Time	UTC+5	Indian Ocean, Asia
MYT	Malaysia Time	UTC+8	Asia
N	November Time Zone	UTC−1	Military
NCT	New Caledonia Time	UTC+11	Pacific
NDT	Newfoundland Daylight Time · Daylight time	UTC−2:30	North America
NFDT	Norfolk Island Daylight Time · Daylight time	UTC+12	Australia, Pacific
NFT	Norfolk Island Time	UTC+11	Australia, Pacific
NOVT	Novosibirsk Time	UTC+7	Asia
NPT	Nepal Time	UTC+5:45	Asia
NRT	Nauru Time	UTC+12	Pacific
NST	Newfoundland Standard Time	UTC−3:30	North America
NUT	Niue Time	UTC−11	Pacific
NZDT	New Zealand Daylight Time · Daylight time	UTC+13	Pacific, Antarctica
NZST	New Zealand Standard Time	UTC+12	Pacific, Antarctica
O	Oscar Time Zone	UTC−2	Military
OMST	Omsk Standard Time	UTC+6	Asia
ORAT	Oral Time	UTC+5	Asia
P	Papa Time Zone	UTC−3	Military
PDT	Pacific Daylight Time · Daylight time	UTC−7	North America
PET	Peru Time	UTC−5	South America
PETT	Kamchatka Time	UTC+12	Asia
PGT	Papua New Guinea Time	UTC+10	Pacific
PHOT	Phoenix Island Time	UTC+13	Pacific
PHT	Philippine Time	UTC+8	Asia
PKT	Pakistan Standard Time	UTC+5	Asia
PMDT	Pierre & Miquelon Daylight Time · Daylight time	UTC−2	North America
PMST	Pierre & Miquelon Standard Time	UTC−3	North America
PONT	Pohnpei Standard Time	UTC+11	Pacific
PST	Pacific Standard Time	UTC−8	North America
PST	Pitcairn Standard Time	UTC−8	Pacific
PWT	Palau Time	UTC+9	Pacific
PYT	Paraguay Time	UTC−3	South America
Q	Quebec Time Zone	UTC−4	Military
R	Romeo Time Zone	UTC−5	Military
RET	Réunion Time	UTC+4	Indian Ocean, Africa
ROTT	Rothera Time	UTC−3	Antarctica
S	Sierra Time Zone	UTC−6	Military
SAKT	Sakhalin Time	UTC+11	Asia
SAMT	Samara Time	UTC+4	Europe
SAST	South Africa Standard Time	UTC+2	Africa
SBT	Solomon Islands Time	UTC+11	Pacific
SCT	Seychelles Time	UTC+4	Indian Ocean, Africa
SGT	Singapore Time	UTC+8	Asia
SLST	Sri Lanka Standard Time	UTC+5:30	Asia
SRET	Srednekolymsk Time	UTC+11	Asia
SRT	Suriname Time	UTC−3	South America
SST	Samoa Standard Time	UTC−11	Pacific
SYOT	Syowa Time	UTC+3	Antarctica
T	Tango Time Zone	UTC−7	Military
TAHT	Tahiti Time	UTC−10	Pacific
TFT	French Southern and Antarctic Time	UTC+5	Indian Ocean, Antarctica
TJT	Tajikistan Time	UTC+5	Asia
TKT	Tokelau Time	UTC+13	Pacific
TLT	East Timor Time	UTC+9	Asia
TMT	Turkmenistan Time	UTC+5	Asia
TOT	Tonga Time	UTC+13	Pacific
TRT	Turkey Time	UTC+3	Europe, Asia
TVT	Tuvalu Time	UTC+12	Pacific
U	Uniform Time Zone	UTC−8	Military
ULAT	Ulaanbaatar Time	UTC+8	Asia
UTC	Coordinated Universal Time	UTC	Europe, Africa, Antarctica
UYT	Uruguay Time	UTC−3	South America
UZT	Uzbekistan Time	UTC+5	Asia
V	Victor Time Zone	UTC−9	Military
VET	Venezuelan Standard Time	UTC−4	South America
VLAT	Vladivostok Time	UTC+10	Asia
VOLT	Volgograd Time	UTC+3	Europe
VOST	Vostok Time	UTC+5	Antarctica
VUT	Vanuatu Time	UTC+11	Pacific
W	Whiskey Time Zone	UTC−10	Military
WAKT	Wake Time	UTC+12	Pacific
WAT	West Africa Time	UTC+1	Africa
WEST	Western European Summer Time · Daylight time	UTC+1	Europe, Africa
WET	Western European Time	UTC	Europe, Africa
WFT	Wallis and Futuna Time	UTC+12	Pacific
WGST	West Greenland Summer Time · Daylight time	UTC−1	North America
WGT	West Greenland Time	UTC−2	North America
WIB	Western Indonesia Time	UTC+7	Asia
WIT	Eastern Indonesia Time	UTC+9	Asia
WITA	Central Indonesia Time	UTC+8	Asia
WST	West Samoa Time	UTC+13	Pacific
X	X-ray Time Zone	UTC−11	Military
Y	Yankee Time Zone	UTC−12	Military
YAKT	Yakutsk Time	UTC+9	Asia
YEKT	Yekaterinburg Time	UTC+5	Asia
Z	Zulu Time Zone	UTC	Military

How to use the abbreviation list

Type into Filter abbreviations to narrow the table. You can search by the abbreviation itself (CET), part of a name (Pacific) or an offset (+5:30). The table shows four things for every entry:

Abbreviation: the short code, such as EST or JST.
Name: the full name, such as Eastern Standard Time.
Offset: the UTC offset the abbreviation stands for.
Regions: where it is used, plus a flag when it is a daylight time, used only in summer.

The By region chips open shorter lists for one part of the world, such as Europe, or the military time zone letters.

The same letters, different zones

Time zone abbreviations are not standardized, and several are shared by zones that are hours apart:

Abbreviation	Possible meanings
CST	Central Standard Time (UTC−6), China Standard Time (UTC+8), Cuba Standard Time (UTC−5)
IST	India Standard Time (UTC+5:30), Irish Standard Time (UTC+1), Israel Standard Time (UTC+2)
AST	Atlantic Standard Time (UTC−4), Arabia Standard Time (UTC+3)
BST	British Summer Time (UTC+1), Bangladesh Standard Time (UTC+6)

That is why a meeting invitation for “10:00 CST” can go wrong. For anything important, give a UTC offset (10:00 UTC−6) or a place name. Software uses IANA zone names such as America/Chicago or Asia/Shanghai, which are unambiguous and also carry the daylight saving rules. If you need the offset of a particular city right now, the time zone converter or the world clock shows it with daylight saving time applied.

Standard time and daylight time

Many abbreviations come in pairs. The S in EST or CST stands for standard time, used in winter, and the D in EDT or CDT for daylight time, used in summer, one hour later. In Europe the summer forms usually add an S for summer: CET becomes CEST and EET becomes EEST. Some people write EST all year when they really mean the local time in New York; strictly, EST is always UTC−5. See daylight saving time for when each region switches.

Military time zone letters

The military and aviation world uses single letters, each with a phonetic name. Alpha (A) to Mike (M) cover UTC+1 to UTC+12, with J skipped. November (N) to Yankee (Y) cover UTC−1 to UTC−12. Zulu (Z) is UTC+0, which is why UTC is often called Zulu time. The letter J, Juliett, is used for the observer’s local time rather than a fixed zone.

Frequently asked questions

What does CST stand for?

Most often Central Standard Time, UTC−6, used in central North America in winter. It is also used for China Standard Time (UTC+8) and Cuba Standard Time (UTC−5), so check the context or ask for the UTC offset.

Why do some zones have two abbreviations?

Places that observe daylight saving time use one abbreviation in winter and another in summer. New York switches between EST (UTC−5) and EDT (UTC−4), London between GMT (UTC+0) and BST (UTC+1).

Who decides time zone abbreviations?

Nobody, officially. Governments set offsets and clock change rules, but the abbreviations are conventions that grew up in each country. The IANA time zone database records commonly used ones, and some zones have none at all, so the database simply shows the offset, such as +04.

What is Zulu time?

Zulu is the military letter Z, meaning UTC+0. A time written as 1400Z is 14:00 Coordinated Universal Time, the same moment everywhere on Earth.