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 Time Zone
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 Time Zone
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 Time Zone
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 Time Zone
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.