Last update: 05.01.2012


The timezone definitions change each year, so the list is in constant change.
The goal was to find one representative timezone for each region. Ideally this would result in 48 definitions, 24 for standard time and 24 for daylight saving time.
Because countries in the same timezone have different begin and end times for daylight saving time the list needed to be adopted to this fact.
The information on this page was taken out from:
The TZ value marks the UTC offset aswell as begin and end of daylight saving time in Posix conform standard.

Official Timezone Name Other Common Timezone Name Abbreviation
(Standard Time)
(Daylight Saving Time)
Deviation from UTC
(for Standard Time)
Timezone Uses Daylight Saving Time TZ (valid for 2012)
Pacific/Niue   NUT   UTC-11 no NUT+11
Pacific/Honolulu US/Hawaii HAST   UTC-10 no HAST+10
America/Anchorage US/Alaska AKST AKDT UTC-9 yes AKST+9AKDT,M3.2.0,M11.1.0
America/Los_Angeles US/Pacific PST PDT UTC-8 yes PST+8PDT,M3.2.0,M11.1.0
America/Tijuana   PST PDT UTC-8 yes PST+8PDT,M3.2.0,M11.1.0
America/Phoenix US/Arizona MST   UTC-7 no MST+7
America/Denver US/Mountain MST MDT UTC-7 yes MST+7MDT,M3.2.0,M11.1.0
America/Mazatlan   MST MDT UTC-7 yes MST+7MDT,M4.1.0,M10.5.0
America/Chicago US/Central CST CDT UTC-6 yes CST+6CDT,M3.2.0,M11.1.0
America/Regina Canada/Saskatchewan CST   UTC-6 no CST+6
America/Mexico_City   CST CDT UTC-6 yes CST+6CDT,M4.1.0,M10.5.0
America/Bogota   COT   UTC-5 no COT+5
America/New_York US/Eastern EST EDT UTC-5 yes EST+5EDT,M3.2.0,M11.1.0
America/Caracas   VET   UTC-4:30 no VET+4:30
America/Halifax Canada/Atlantic AST ADT UTC-4 yes AST+4ADT,M3.2.0,M11.1.0
America/Santiago   CLT CLST UTC-4 yes CLT+4CLST,M10.2.0,M3.2.0
America/La_Paz   BOT   UTC-4 no BOT+4
America/St_Johns Canada/Newfoundland NST NDT UTC-3:30 yes NST+3:30NDT,M3.2.0,M11.1.0
America/Sao_Paulo Brazil/East BRT BRST UTC-3 yes BRT+3BRST,M10.3.0,M2.3.0
America/Buenos_Aires   ART ARST UTC-3 no ART+3
America/Montevideo   UYT UYST UTC-3 yes UYT+3UYST,M10.1.0,M3.2.0
Atlantic/South_Georgia Atlantic/King_Edward_Point GST   UTC-2 no GST+2
Atlantic/Azores   AZOT AZOST UTC-1 yes AZOT+1AZOST,M3.5.0,M10.5.0
Atlantic/Cape_Verde Atlantic/Praia CVT   UTC-1 no CVT+1
Africa/Casablanca   WET   UTC no WET+0
UTC       UTC ---  
Europe/London   GMT BST UTC yes GMT+0BST,M3.5.0,M10.5.0
Europe/Berlin   CET CEST UTC+1 yes CET-1CEST,M3.5.0,M10.5.0
Africa/Kinshasa   WAT   UTC+1 no WAT-1
Europe/Istanbul   EET EEST UTC+2 yes EET-2EEST,M3.5.0,M10.5.0
Africa/Cairo   EET EEST UTC+2 no EET-2
Asia/Jerusalem   IST IDT UTC+2 yes IST-2IDT,M3.5.5,M9.4.0
Africa/Johannesburg   SAST   UTC+2 no SAST-2
Europe/Moscow   MSK MSD UTC+3 yes (all year) MSD-4
Africa/Nairobi   EAT   UTC+3 no EAT-3
Asia/Baghdad   AST ADT UTC+3 no AST-3
Asia/Tehran   IRST IRDT UTC+3:30 yes IRST-3:30IRDT,M3.3.3,M9.3.5
Asia/Muscat   GST   UTC+4 no GST-4
Asia/Baku   AZT AZST UTC+4 yes AZT-4AZST,M3.5.0,M10.5.0
Asia/Kabul   AFT   UTC+4:30 no AFT-4:30
Asia/Karachi   PKT   UTC+5 no PKT-5
Asia/Kolkata   IST   UTC+5:30 no IST-5:30
Asia/Katmandu   NPT   UTC+5:45 no NPT-5:45
Asia/Almaty   ALMT   UTC+6 no ALMT-6
Asia/Dhaka   BST   UTC+6 no BST-6
Asia/Rangoon Asia/Naypyidaw MMT   UTC+6:30 no MMT-6:30
Asia/Bangkok   ICT   UTC+7 no ICT-7
Asia/Hong_Kong   HKT   UTC+8 no HKT-8
Asia/Singapore   SGT   UTC+8 no SGT-8
Australia/Perth   WST WDT UTC+8 no WST-8
Asia/Taipei   CST   UTC+8 no CST-8
Asia/Tokyo   JST   UTC+9 no JST-9
Asia/Seoul   KST   UTC+9 no KST-9
Australia/Adelaide   CST CDT UTC+9:30 yes CST-9:30CDT,M10.1.0,M4.1.0
Australia/Darwin   CST   UTC+9:30 no CST-9:30
Australia/Sydney   EST EDT UTC+10 yes EST-10EDT,M10.1.0,M4.1.0
Australia/Brisbane   EST   UTC+10 no EST-10
Pacific/Noumea   NCT   UTC+11 no NCT-11
Pacific/Auckland   NZST NZDT UTC+12 yes NZST-12NZDT,M9.5.0,M4.1.0
Pacific/Kwajalein   MHT   UTC+12 no MHT-12
Pacific/Apia Pacific/Samoa WST   UTC+13 yes WST-13WST,M9.5.0,M4.1.6
Pacific/Line_Islands   LINT   UTC+14 no LINT-14