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Date and time:
10/23/2014 |
05:53

Timezones of the the world

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Index of time zone acronyms and abbreviations

Timezone map of the World

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Timezones map

Printable version of the World's Timezone Map.

A Quick Guide To World Timezones

World timezones are actually a relatively new part of the way that the civilized world works. World timezones were created in order to create a certain amount of uniformity in how people describe their time of day in different parts of the world. Using local or solar time makes it nearly impossible for a modern society to work. If we didn't have world timezones, scheduling trains would be nearly impossible, planning meetings in different countries would quickly prove problematic, and similar issues would arise daily.
 
Daylight doesn't hit the world uniformly, which means that if there was a single standard time worldwide, you would have a completely different impression of what 10:00 AM would look like. Though this does not sound like a major problem, it does make many things difficult to describe, such as the time of day. In the times before world timezones, people would often find it nearly impossible to schedule meetings at a long distance due to the difficulty in coming to an agreement on what time it was. World timezones are made for legal, social, and commercial purposes in mind.
 
Initially, there was only one real way to distinguish different world time zones. However, there are now multiple ways to discern time using a world clock. Still, the most common way to deal with the world clock is to use the Greenwich Mean Time, also known as GMT, as a measuring stick. Standard world timezones are made with an offset of hours referring to GMT. So, New Zealand's time is often quoted as being 11 hours and 30 minutes ahead of Greenwich Mean Time.
 
Advancements in the measuring of time allowed scientists to come up with a system that allows them to take into account the seconds that are lost with each year. This doesn't sound like much, but seconds do add up to minutes eventually. The newer form of time-telling using world timezones is called UTC, and is based off of GMT time-telling.
 
Normally, one would simply believe that GMT and UTC timezones are enough. But still, there are even more ways of differentiating time zones for those who are curious.
 
Many countries have chosen to use their own standard time zones, and so have many different groups of people. Military personnel often use military time zones to plan their maneuvers. Nautical time zones, which are non-skewed, are very common among people who frequently travel by boat. When it comes to different countries and continents, other common ways of dividing time zones include CET (Central European Time), and New Zealand Mean Time.
 
There is still a lot of bickering about which timezones are actually the best ones to use universally. There really isn't a universally accepted time zone scheme, and things are even more complicated when Daylight Savings Time is taken into consideration. Many, if not most, countries no longer practice Daylight Savings Time. The issue of Daylight Savings Time, or DST, has been one that has caused a certain amount of friction in international airports, as well as a lot of confusion abroad.
 
Travelers who are looking to find a reliable way to tell time abroad are best off using world timezones that are used by both military and naval personalities. They are often the most accurate ways to tell time. Of course, for those who are scheduling meetings, and figuring out when they will be able to catch a plane, it's best to search up the current world timezones your destination location happens to be using. After all, it's always better to be safe than sorry.

Timezones in North America

The following table lists the North American time zone abbreviations.

Abbreviation Full name Other abbreviations Time zone
NST Newfoundland Standard Time HNT UTC - 3:30 hours
NDT Newfoundland Daylight Time HAT UTC - 2:30 hours
AST Atlantic Standard Time HNA UTC - 4 hours
ADT Atlantic Daylight Time HAA UTC - 3 hours
EST Eastern Standard Time HNE UTC - 5 hours
EDT Eastern Daylight Time HAE UTC - 4 hours
CST Central Standard Time HNC UTC - 6 hours
CDT Central Daylight Time HAC UTC - 5 hours
MST Mountain Standard Time HNR UTC - 7 hours
MDT Mountain Daylight Time HAR UTC - 6 hours
PST Pacific Standard Time HNP UTC - 8 hours
PDT Pacific Daylight Time HAP UTC - 7 hours
AKST Alaska Standard Time HNY UTC - 9 hours
AKDT Alaska Daylight Time HAY UTC - 8 hours
HAST Hawaii-Aleutian Standard Time HST UTC - 10 hours
HADT Hawaii-Aleutian Daylight Time UTC - 9 hours

Timezones in Australia

The following table lists the Australian time zone abbreviations.

Abbreviation Full name Other abbreviations Time zone
NFT Norfolk (Island) Time UTC + 11:30 hours
EST Eastern Standard Time AEST UTC + 10 hours
EDT Eastern Daylight Time AEDT, EST UTC + 11 hours
CST Central Standard Time ACST UTC + 9:30 hours
CDT Central Daylight Time ACDT, CST UTC + 10:30 hours
WST Western Standard Time AWST UTC + 8 hours
WDT Western Daylight Time AWDT, WST UTC + 9 hours
CXT Christmas Island Time UTC + 7 hours

Timezones in Europe

The following table lists the European time zone abbreviations.

The term “IST” is not the legal abbreviation to describe Irish Summer Time but it is commonly used. IST is described as “summer time”, according to Irish law, while Irish Standard Time is described as both “standard time” and “winter time”.

Abbreviation Full name Other abbreviations Time zone
GMT Greenwich Mean Time UTC UTC
BST British Summer Time UTC + 1 hour
IST Irish Summer Time UTC + 1 hour
WET Western European Time UTC
WEST Western European Summer Time WEDT UTC + 1 hour
CET Central European Time MEZ UTC + 1 hour
CEST Central European Summer Time CEDT, MESZ UTC + 2 hours
EET Eastern European Time UTC + 2 hours
EEST Eastern European Summer Time EEDT UTC + 3 hours
MSK Moscow Standard Time UTC + 3 hours
MSD Moscow Daylight Time UTC + 4 hours

Military / NATO / letter timezones

The following table lists the Military time zone abbreviations.

The basis for this is Z - Zulu time - Zero meridian time - the same as UTC It's a convention to assign letters to time zones, where Z= Zero meridian, and Zulu is the word that represents the letter Z, when it's used in communication. It is sometimes used in the US Military and NATO in conjunction with 24 hour clocks, and is also popular to use in movies to reference time.

Other letters/words are used for other time zones than UTC, most based on the right or reverse order of the Alphabet. Note that 'J' is skipped ('J' - Juliet refers to current local time of the observer). There are 25 time zones defined here, but 26 letters in the English alphabet.

Abbreviation Full name Other abbreviations Time zone
Z Zulu Time Zone UTC
Y Yankee Time Zone UTC - 12 hours
X X-ray Time Zone UTC - 11 hours
W Whiskey Time Zone UTC - 10 hours
V Victor Time Zone UTC - 9 hours
U Uniform Time Zone UTC - 8 hours
T Tango Time Zone UTC - 7 hours
S Sierra Time Zone UTC - 6 hours
R Romeo Time Zone UTC - 5 hours
Q Quebec Time Zone UTC - 4 hours
P Papa Time Zone UTC - 3 hours
O Oscar Time Zone UTC - 2 hours
N November Time Zone UTC - 1 hour
A Alpha Time Zone UTC + 1 hour
B Bravo Time Zone UTC + 2 hours
C Charlie Time Zone UTC + 3 hours
D Delta Time Zone UTC + 4 hours
E Echo Time Zone UTC + 5 hours
F Foxtrot Time Zone UTC + 6 hours
G Golf Time Zone UTC + 7 hours
H Hotel Time Zone UTC + 8 hours
I India Time Zone UTC + 9 hours
K Kilo Time Zone UTC + 10 hours
L Lima Time Zone UTC + 11 hours
M Mike Time Zone UTC + 12 hours

Index of timezone acronyms and abbreviations

Alphabetically sorted. Note that some of the abbreviations are not unique, these will have several entries in the list. Other time zones have many common names, and each of these will be listed as well.

Abbreviation

Full name

Location

Time zone

A

Alpha Time Zone

Military

UTC + 1 hour

ACDT

Australian Central Daylight Time

Australia

UTC + 10:30 hours

ACST

Australian Central Standard Time

Australia

UTC + 9:30 hours

ADT

Atlantic Daylight Time

North America

UTC - 3 hours

AEDT

Australian Eastern Dayl. Time or Australian Eastern Summer Time

Australia

UTC + 11 hours

AEST

Australian Eastern Standard Time

Australia

UTC + 10 hours

AKDT

Alaska Daylight Time

North America

UTC - 8 hours

AKST

Alaska Standard Time

North America

UTC - 9 hours

AST

Atlantic Standard Time

North America

UTC - 4 hours

AWDT

Australian Western Daylight Time

Australia

UTC + 9 hours

AWST

Australian Western Standard Time

Australia

UTC + 8 hours

B

Bravo Time Zone

Military

UTC + 2 hours

BST

British Summer Time

Europe

UTC + 1 hour

C

Charlie Time Zone

Military

UTC + 3 hours

CDT

Central Daylight Time

Australia

UTC + 10:30 hours

CDT

Central Daylight Time

North America

UTC - 5 hours

CEDT

Central European Daylight Time

Europe

UTC + 2 hours

CEST

Central European Summer Time

Europe

UTC + 2 hours

CET

Central European Time

Europe

UTC + 1 hour

CST

Central Summer Time

Australia

UTC + 10:30 hours

CST

Central Standard Time

Australia

UTC + 9:30 hours

CST

Central Standard Time

North America

UTC - 6 hours

CXT

Christmas Island Time

Australia

UTC + 7 hours

D

Delta Time Zone

Military

UTC + 4 hours

E

Echo Time Zone

Military

UTC + 5 hours

EDT

Eastern Daylight Time

Australia

UTC + 11 hours

EDT

Eastern Daylight Time

North America

UTC - 4 hours

EEDT

Eastern European Daylight Time

Europe

UTC + 3 hours

EEST

Eastern European Summer Time

Europe

UTC + 3 hours

EET

Eastern European Time

Europe

UTC + 2 hours

EST

Eastern Summer Time

Australia

UTC + 11 hours

EST

Eastern Standard Time

Australia

UTC + 10 hours

EST

Eastern Standard Time

North America

UTC - 5 hours

F

Foxtrot Time Zone

Military

UTC + 6 hours

G

Golf Time Zone

Military

UTC + 7 hours

GMT

Greenwich Mean Time

Europe

UTC

H

Hotel Time Zone

Military

UTC + 8 hours

HAA

Heure Avancée de l'Atlantique

North America

UTC - 3 hours

HAC

Heure Avancée du Centre

North America

UTC - 5 hours

HADT

Hawaii-Aleutian Daylight Time

North America

UTC - 9 hours

HAE

Heure Avancée de l'Est

North America

UTC - 4 hours

HAP

Heure Avancée du Pacifique

North America

UTC - 7 hours

HAR

Heure Avancée des Rocheuses

North America

UTC - 6 hours

HAST

Hawaii-Aleutian Standard Time

North America

UTC - 10 hours

HAT

Heure Avancée de Terre-Neuve

North America

UTC - 2:30 hours

HAY

Heure Avancée du Yukon

North America

UTC - 8 hours

HNA

Heure Normale de l'Atlantique

North America

UTC - 4 hours

HNC

Heure Normale du Centre

North America

UTC - 6 hours

HNE

Heure Normale de l'Est

North America

UTC - 5 hours

HNP

Heure Normale du Pacifique

North America

UTC - 8 hours

HNR

Heure Normale des Rocheuses

North America

UTC - 7 hours

HNT

Heure Normale de Terre-Neuve

North America

UTC - 3:30 hours

HNY

Heure Normale du Yukon

North America

UTC - 9 hours

I

India Time Zone

Military

UTC + 9 hours

IST

Irish Summer Time

Europe

UTC + 1 hour

K

Kilo Time Zone

Military

UTC + 10 hours

L

Lima Time Zone

Military

UTC + 11 hours

M

Mike Time Zone

Military

UTC + 12 hours

MDT

Mountain Daylight Time

North America

UTC - 6 hours

MESZ

Mitteleuroäische Sommerzeit

Europe

UTC + 2 hours

MEZ

Mitteleuropäische Zeit

Europe

UTC + 1 hour

MSD

Moscow Daylight Time

Europe

UTC + 4 hours

MSK

Moscow Standard Time

Europe

UTC + 3 hours

MST

Mountain Standard Time

North America

UTC - 7 hours

N

November Time Zone

Military

UTC - 1 hour

NDT

Newfoundland Daylight Time

North America

UTC - 2:30 hours

NFT

Norfolk (Island) Time

Australia

UTC + 11:30 hours

NST

Newfoundland Standard Time

North America

UTC - 3:30 hours

O

Oscar Time Zone

Military

UTC - 2 hours

P

Papa Time Zone

Military

UTC - 3 hours

PDT

Pacific Daylight Time

North America

UTC - 7 hours

PST

Pacific Standard Time

North America

UTC - 8 hours

Q

Quebec Time Zone

Military

UTC - 4 hours

R

Romeo Time Zone

Military

UTC - 5 hours

S

Sierra Time Zone

Military

UTC - 6 hours

T

Tango Time Zone

Military

UTC - 7 hours

U

Uniform Time Zone

Military

UTC - 8 hours

UTC

Coordinated Universal Time

Europe

UTC

V

Victor Time Zone

Military

UTC - 9 hours

W

Whiskey Time Zone

Military

UTC - 10 hours

WDT

Western Daylight Time

Australia

UTC + 9 hours

WEDT

Western European Daylight Time

Europe

UTC + 1 hour

WEST

Western European Summer Time

Europe

UTC + 1 hour

WET

Western European Time

Europe

UTC

WST

Western Summer Time

Australia

UTC + 9 hours

WST

Western Standard Time

Australia

UTC + 8 hours

X

X-ray Time Zone

Military

UTC - 11 hours

Y

Yankee Time Zone

Military

UTC - 12 hours

Z

Zulu Time Zone

Military

UTC

The decrease in daylight during the winter months is due to Earth's axial tilt of 23 degrees. If the Earth was not tilted on it's axis, the length of day and night would remain steady year long. During winter in the northern hemisphere there is less daylight hours, and the southern hemisphere in turn has longer daylight hours and experiences summer.

The main purpose of Daylight Saving Time (called "Summer Time" in many places in the world) is to make better use of daylight. In Ireland we advance our clocks forward by one hour in Spring to maximise daylight for the summer months. This has the effect of moving an hour of daylight from the morning to the evening. In Winter the clocks are then changed back by one hour to maximise daylight during morning hours.

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