World Time Zones
Definition of Time Zones
A time zone item specifies an international time zone, indicated by a small set of letters.
Military time zone designations use a single letter (except j). Zulu Time (z) is Greenwich Mean Time (GMT).
Here are the most common standard-time time zones, indexed by the zone hour value.
|
GMT
offset |
Time Zone Abbreviation Examples |
Military
Time Zone |
|---|---|---|
| -0:00 |
GMT
=
Greenwich Mean Time
UT or UTC for Universal (Coordinated) Time WET for Western European Time |
z |
Time Zones East of Greenwich
|
GMT
offset |
Time Zone Abbreviation Examples |
Military
|
|---|---|---|
| GMT+1 |
CET =
Central European Time
WAT = West Africa Time (e.g Algeria) |
A |
| GMT+2 | EET = Eastern European Time, USZ1 = Kaliningrad Time | B |
| GMT+3 | MSK = Moscow Time, EAT = East Africa Time (e.g.Kenya) | C |
| GMT+4 | SMT = Samara Time, AMT = Armenia Time, AZT = Azerbaidjan Time, GET = Georgia Time, MUT = Mauritius Time | D |
| GMT+5 | PKT = Pakistan Standard Time, YEKT = Yekaterinburg Time, MVT = Maldives Time | E |
| GMT+6 | OMSK = Omsk Time, BST = Bangladesh Standard Time | F |
| GMT+7 | CXT = Christmas Island Time (Australia), KRAT = Krasnoyarsk Time, | G |
| GMT+8 |
CST =
China Standard Time
IRKT = Irkutsk Time
AWST = Australian Western Standard Time WST = Western Standard Time (Australia) |
H |
| GMT+9 | JST = Japan Standard Time , YAKT = Yakutsk Time | I |
| GMT+10 |
EAST = East Australian Standard Time
EST = Eastern Standard Time (Australia) VLAT = Vladivostok Time |
K |
| GMT+11 |
SAKT = Sakhalin Time
|
L |
| GMT+12 |
IDLE = International Date Line East
NZST = New Zealand Standard Time NZT = New Zealand Time MAGT = Magadan Time |
M |
Time Zones West of Greenwich
|
GMT
offset |
Time Zone Abbreviations |
Military
|
|---|---|---|
| GMT-1 | WAT = West Africa Time | N |
| GMT-2 | AT = Azores Time | O |
| GMT-3 | ART = Argentina Time | P |
| GMT-4 | AST = Atlantic Standard Time (Canada) | Q |
| GMT-5 | EST = Eastern Standard Time (USA & Canada) | R |
| GMT-6 | CST = Central Standard Time (USA & Canada) | S |
| GMT-7 | MST = Mountain Standard Time (USA & Canada) | T |
| GMT-8 | PST = Pacific Standard Time (USA & Canada) | U |
| GMT-9 |
AKST
Alaska Standard Time
(USA)
YST = Yukon Standard Time (Canada) |
V |
| GMT-10 |
HST
=
Hawaii Standard Time
HAST Hawaii-Aleutian Standard Time (USA) AHST = Alaska-Hawaii Standard Time (obs) CAT = Central Alaska Time |
W |
| GMT-11 | NT = Nome Time | X |
| GMT-12 | IDLW = International Date Line West | Y |
Here are many Daylight Saving Time (DST) time zones, indexed by the zone hour value.
|
GMT
offset |
Time Zone Abbreviations |
Military
|
|---|---|---|
| GMT-3 | ADT = Atlantic Daylight Time (Canada) | P |
| GMT-4 | EDT = Eastern Daylight Time (USA & Canada) | Q |
| GMT-5 | CDT = Central Daylight Time (USA & Canada) | R |
| GMT-6 | MDT = Mountain Daylight Time (USA & Canada) | S |
| GMT-7 | PDT = Pacific Daylight Time (USA & Canada) | T |
| GMT-8 |
AKDT
=
Alaska Daylight Time
(USA)
YDT = Yukon Daylight Time (Canada) HADT = HawaiiGMT-Aleutian Daylight Time (USA) |
U |
| GMT-9 | HDT = Hawaii Daylight Time (USA) | V |
|
GMT
offset |
Time Zone Abbreviations |
Military
|
|---|---|---|
| GMT+1 |
BST
=
British Summer Time
(UK)
IST = Irish Summer Time (Ireland) WEDT = Western European Daylight Time WEST Western European Summer Time |
A |
| GMT+2 |
CEDT = Central European Daylight Time
CEST = Central European Summer Time MEST = Middle European Summer Time MESZ = Middle European Summer Time |
B |
| GMT+3 |
EEDT = Eastern European Daylight Time
EEST Eastern European Summer Time |
C |
| GMT+8 | WADT = West Australian Daylight Time | H |
| GMT+11 |
EADT = Eastern Australian Daylight Time
EST = Eastern Summer (Daylight) Time (Australia) |
L |
| GMT+13 | NZDT = New Zealand Daylight Time | M* |
French Time Zone Abbreviations
HAA = Heure Avancée de l'Atlantique GMT-3
HAC = Heure Avancée du Centre GMT-5
HAE = Heure Avancée de l'Est GMT-4
HAP = Heure Avancée du Pacifique GMT-7
HAR = Heure Avancée des Rocheuses GMT-6
HAT = Heure Avancée de Terre-Neuve GMT-2:30
HAY = Heure Avancée du Yukon GMT-8
HNA = Heure Normale de l'Atlantique GMT-4
HNC = Heure Normale du Centre GMT-6
HNE = Heure Normale de l'Est GMT-5
HNP = Heure Normale du Pacifique GMT-8
HNR = Heure Normale des Rocheuses GMT-7
HNT = Heure Normale de Terre-Neuve GMT-3:30
HNY = Heure Normale du Yukon GMT-9
German Time Zone Abbreviations
MESZ = Mitteleuropäische Sommerzeit GMT+2
MEZ = Mitteleuropäische Zeit GMT+1
Non-standard Time Zones
ACDT Australian Central Daylight Time Australia GMT+10:30
ACST Australian Central Standard Time Australia GMT+9:30
CST Central Summer (Daylight) Time Australia GMT+10:30
CST Central Standard Time Australia GMT+9:30
IST = India Standard Time GMT+5:30
NDT Newfoundland Daylight Time (Canada) GMT-2:30
NFT Norfolk (Island) Time (Australia) GMT+11:30
NST Newfoundland Standard Time (Canada) GMT-3:30
Military Time Zones
The hourly zones are used by the military are referred to by a letter of the alphabet (or their phonetic equivalent).
The letter J is not used.
The other 25 letters cover the 12 time zones to the east of Greenwich and the 12 time zones to the west of Greenwich. The 25th zone is Z (Zulu) for GMT / UTC.
A - M are for time zones to the East of Greenwich
N - Y are for time zones to the West of Greenwich.
