For all supported locales as well as examples of display formats for each, visit https://help.salesforce.com/apex/HTViewHelpDoc?id=admin_supported_locales.htm

Afrikaans (South Africa)

af-ZA

Albanian (Albania)

sq-AL

Amharic (Ethiopia)

am-ET

Arabic (Algeria)

ar-DZ

Arabic (Bahrain)

ar-BH

Arabic (Egypt)

ar-EG

Arabic (Iraq)

ar-IQ

Arabic (Jordan)

ar-JO

Arabic (Kuwait)

ar-KW

Arabic (Lebanon)

ar-LB

Arabic (Libya)

ar-LY

Arabic (Morocco)

ar-MA

Arabic (Oman)

ar-OM

Arabic (Qatar)

ar-QA

Arabic (Saudi Arabia)

ar-SA

Arabic (Syria)

ar-SY

Arabic (Tunisia)

ar-TN

Arabic (U.A.E.)

ar-AE

Arabic (Yemen)

ar-YE

Armenian (Armenia)

hy-AM

Assamese (India)

as-IN

Bashkir (Russia)

ba-RU

Basque (Basque)

eu-ES

Belarusian (Belarus)

be-BY

Bengali (Bangladesh)

bn-BD

Bengali (India)

bn-IN

Breton (France)

br-FR

Bulgarian (Bulgaria)

bg-BG

Catalan (Catalan)

ca-ES

Chinese (Hong Kong S.A.R.)

zh-HK

Chinese (Macao S.A.R.)

zh-MO

Chinese (People's Republic of China)

zh-CN

Chinese (Singapore)

zh-SG

Chinese (Taiwan)

zh-TW

Corsican (France)

co-FR

Croatian (Croatia)

hr-HR

Croatian (Latin) (Bosnia and Herzegovina)

hr-BA

Czech (Czech Republic)

cs-CZ

Danish (Denmark)

da-DK

Dari (Afghanistan)

prs-AF

Divehi (Maldives)

dv-MV

Dutch (Belgium)

nl-BE

Dutch (Netherlands)

nl-NL

English (Australia)

en-AU

English (Belize)

en-BZ

English (Canada)

en-CA

English (Caribbean)

en-029

English (India)

en-IN

English (Ireland)

en-IE

English (Jamaica)

en-JM

English (Malaysia)

en-MY

English (New Zealand)

en-NZ

English (Republic of the Philippines)

en-PH

English (Singapore)

en-SG

English (South Africa)

en-ZA

English (Trinidad and Tobago)

en-TT

English (United Kingdom)

en-GB

English (United States)

en-US

English (Zimbabwe)

en-ZW

Estonian (Estonia)

et-EE

Faroese (Faroe Islands)

fo-FO

Finnish (Finland)

fi-FI

French (Belgium)

fr-BE

French (Canada)

fr-CA

French (France)

fr-FR

French (Luxembourg)

fr-LU

French (Principality of Monaco)

fr-MC

French (Switzerland)

fr-CH

Frisian (Netherlands)

fy-NL

Galician (Galician)

gl-ES

Georgian (Georgia)

ka-GE

German (Austria)

de-AT

German (Germany)

de-DE

German (Liechtenstein)

de-LI

German (Luxembourg)

de-LU

German (Switzerland)

de-CH

Greek (Greece)

el-GR

Greenlandic (Greenland)

kl-GL

Gujarati (India)

gu-IN

Hebrew (Israel)

he-IL

Hindi (India)

hi-IN

Hungarian (Hungary)

hu-HU

Icelandic (Iceland)

is-IS

Igbo (Nigeria)

ig-NG

Indonesian (Indonesia)

id-ID

Irish (Ireland)

ga-IE

isiXhosa (South Africa)

xh-ZA

isiZulu (South Africa)

zu-ZA

Italian (Italy)

it-IT

Italian (Switzerland)

it-CH

Japanese (Japan)

ja-JP

Kannada (India)

kn-IN

Kazakh (Kazakhstan)

kk-KZ

Khmer (Cambodia)

km-KH

Kinyarwanda (Rwanda)

rw-RW

Kiswahili (Kenya)

sw-KE

Korean (Korea)

ko-KR

Kyrgyz (Kyrgyzstan)

ky-KG

Lao (Lao P.D.R.)

lo-LA

Latvian (Latvia)

lv-LV

Lithuanian (Lithuania)

lt-LT

Luxembourgish (Luxembourg)

lb-LU

Macedonian (Former Yugoslav Republic of Macedonia)

mk-MK

Malay (Brunei Darussalam)

ms-BN

Malay (Malaysia)

ms-MY

Malayalam (India)

ml-IN

Maltese (Malta)

mt-MT

Maori (New Zealand)

mi-NZ

Mapudungun (Chile)

arn-CL

Marathi (India)

mr-IN

Nepali (Nepal)

ne-NP

Norwegian, Bokmål (Norway)

nb-NO

Norwegian, Nynorsk (Norway)

nn-NO

Occitan (France)

oc-FR

Oriya (India)

or-IN

Pashto (Afghanistan)

ps-AF

Persian (Iran)

fa-IR

Polish (Poland)

pl-PL

Portuguese (Brazil)

pt-BR

Portuguese (Portugal)

pt-PT

Punjabi (India)

pa-IN

Romanian (Romania)

ro-RO

Romansh (Switzerland)

rm-CH

Russian (Russia)

ru-RU

Sami (Northern) (Finland)

se-FI

Sami (Northern) (Norway)

se-NO

Sami (Northern) (Sweden)

se-SE

Sanskrit (India)

sa-IN

Setswana (South Africa)

tn-ZA

Sinhala (Sri Lanka)

si-LK

Slovak (Slovakia)

sk-SK

Slovenian (Slovenia)

sl-SI

Spanish (Argentina)

es-AR

Spanish (Bolivia)

es-BO

Spanish (Chile)

es-CL

Spanish (Colombia)

es-CO

Spanish (Costa Rica)

es-CR

Spanish (Dominican Republic)

es-DO

Spanish (Ecuador)

es-EC

Spanish (El Salvador)

es-SV

Spanish (Guatemala)

es-GT

Spanish (Honduras)

es-HN

Spanish (Mexico)

es-MX

Spanish (Nicaragua)

es-NI

Spanish (Panama)

es-PA

Spanish (Paraguay)

es-PY

Spanish (Peru)

es-PE

Spanish (Puerto Rico)

es-PR

Spanish (Spain)

es-ES

Spanish (United States)

es-US

Spanish (Uruguay)

es-UY

Spanish (Venezuela)

es-VE

Swedish (Finland)

sv-FI

Swedish (Sweden)

sv-SE

Tamil (India)

ta-IN

Tatar (Russia)

tt-RU

Telugu (India)

te-IN

Thai (Thailand)

th-TH

Tibetan (People's Republic of China)

bo-CN

Turkish (Turkey)

tr-TR

Turkmen (Turkmenistan)

tk-TM

Uighur (People's Republic of China)

ug-CN

Ukrainian (Ukraine)

uk-UA

Urdu (Islamic Republic of Pakistan)

ur-PK

Vietnamese (Vietnam)

vi-VN

Welsh (United Kingdom)

cy-GB

Wolof (Senegal)

wo-SN

Yi (People's Republic of China)

ii-CN

Yoruba (Nigeria)

yo-NG