> This page is part of the [Customer.io documentation](https://docs.customer.io). For the complete index, see [llms.txt](https://docs.customer.io/llms.txt).
> Last updated: July 10, 2026

# Supported time zone formats

These are the values we support when you use the `timezone` attribute in your emails and attributes. Note that we support [automatic geolocation data collection](/messaging/send/timezones/geolocation/) as well. If you use automatic geolocation data collection, we’ll set a `cio_timezone` attribute that you can use with our time zone-related features, so you don’t need to set the `timezone` attribute.

*   [Region Format](#region-format) - Supported in our emails and attributes as well as the [Time Zone Match](/messaging/send/timezones/match/) feature.
*   [Detailed Format](#detailed-format) - Supported in our emails and attributes but **NOT** in our Time Zone Match feature.

## Region Format

Africa/Abidjan Africa/Accra Africa/Addis\_Ababa Africa/Algiers Africa/Asmara Africa/Asmera Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre Africa/Brazzaville Africa/Bujumbura Africa/Cairo Africa/Casablanca Africa/Ceuta Africa/Conakry Africa/Dakar Africa/Dar\_es\_Salaam Africa/Djibouti Africa/Douala Africa/El\_Aaiun Africa/Freetown Africa/Gaborone Africa/Harare Africa/Johannesburg Africa/Juba Africa/Kampala Africa/Khartoum Africa/Kigali Africa/Kinshasa Africa/Lagos Africa/Libreville Africa/Lome Africa/Luanda Africa/Lubumbashi Africa/Lusaka Africa/Malabo Africa/Maputo Africa/Maseru Africa/Mbabane Africa/Mogadishu Africa/Monrovia Africa/Nairobi Africa/Ndjamena Africa/Niamey Africa/Nouakchott Africa/Ouagadougou Africa/Porto-Novo Africa/Sao\_Tome Africa/Timbuktu Africa/Tripoli Africa/Tunis Africa/Windhoek America/Adak America/Anchorage America/Anguilla America/Antigua America/Araguaina America/Argentina/Buenos\_Aires America/Argentina/Catamarca America/Argentina/ComodRivadavia America/Argentina/Cordoba America/Argentina/Jujuy America/Argentina/La\_Rioja America/Argentina/Mendoza America/Argentina/Rio\_Gallegos America/Argentina/Salta America/Argentina/San\_Juan America/Argentina/San\_Luis America/Argentina/Tucuman America/Argentina/Ushuaia America/Aruba America/Asuncion America/Atikokan America/Atka America/Bahia America/Bahia\_Banderas America/Barbados America/Belem America/Belize America/Blanc-Sablon America/Boa\_Vista America/Bogota America/Boise America/Buenos\_Aires America/Cambridge\_Bay America/Campo\_Grande America/Cancun America/Caracas America/Catamarca America/Cayenne America/Cayman America/Chicago America/Chihuahua America/Coral\_Harbour America/Cordoba America/Costa\_Rica America/Creston America/Cuiaba America/Curacao America/Danmarkshavn America/Dawson America/Dawson\_Creek America/Denver America/Detroit America/Dominica America/Edmonton America/Eirunepe America/El\_Salvador America/Ensenada America/Fort\_Wayne America/Fortaleza America/Glace\_Bay America/Godthab America/Goose\_Bay America/Grand\_Turk America/Grenada America/Guadeloupe America/Guatemala America/Guayaquil America/Guyana America/Halifax America/Havana America/Hermosillo America/Indiana/Indianapolis America/Indiana/Knox America/Indiana/Marengo America/Indiana/Petersburg America/Indiana/Tell\_City America/Indiana/Vevay America/Indiana/Vincennes America/Indiana/Winamac America/Indianapolis America/Inuvik America/Iqaluit America/Jamaica America/Jujuy America/Juneau America/Kentucky/Louisville America/Kentucky/Monticello America/Knox\_IN America/Kralendijk America/La\_Paz America/Lima America/Los\_Angeles America/Louisville America/Lower\_Princes America/Maceio America/Managua America/Manaus America/Marigot America/Martinique America/Matamoros America/Mazatlan America/Mendoza America/Menominee America/Merida America/Metlakatla America/Mexico\_City America/Miquelon America/Moncton America/Monterrey America/Montevideo America/Montreal America/Montserrat America/Nassau America/New\_York America/Nipigon America/Nome America/Noronha America/North\_Dakota/Beulah America/North\_Dakota/Center America/North\_Dakota/New\_Salem America/Ojinaga America/Panama America/Pangnirtung America/Paramaribo America/Phoenix America/Port-au-Prince America/Port\_of\_Spain America/Porto\_Acre America/Porto\_Velho America/Puerto\_Rico America/Rainy\_River America/Rankin\_Inlet America/Recife America/Regina America/Resolute America/Rio\_Branco America/Rosario America/Santa\_Isabel America/Santarem America/Santiago America/Santo\_Domingo America/Sao\_Paulo America/Scoresbysund America/Shiprock America/Sitka America/St\_Barthelemy America/St\_Johns America/St\_Kitts America/St\_Lucia America/St\_Thomas America/St\_Vincent America/Swift\_Current America/Tegucigalpa America/Thule America/Thunder\_Bay America/Tijuana America/Toronto America/Tortola America/Vancouver America/Virgin America/Whitehorse America/Winnipeg America/Yakutat America/Yellowknife Antarctica/Casey Antarctica/Davis Antarctica/DumontDUrville Antarctica/Macquarie Antarctica/Mawson Antarctica/McMurdo Antarctica/Palmer Antarctica/Rothera Antarctica/South\_Pole Antarctica/Syowa Antarctica/Vostok Arctic/Longyearbyen Asia/Aden Asia/Almaty Asia/Amman Asia/Anadyr Asia/Aqtau Asia/Aqtobe Asia/Ashgabat Asia/Ashkhabad Asia/Baghdad Asia/Bahrain Asia/Baku Asia/Bangkok Asia/Beirut Asia/Bishkek Asia/Brunei Asia/Calcutta Asia/Choibalsan Asia/Chongqing Asia/Chungking Asia/Colombo Asia/Dacca Asia/Damascus Asia/Dhaka Asia/Dili Asia/Dubai Asia/Dushanbe Asia/Gaza Asia/Harbin Asia/Hebron Asia/Ho\_Chi\_Minh Asia/Hong\_Kong Asia/Hovd Asia/Irkutsk Asia/Istanbul Asia/Jakarta Asia/Jayapura Asia/Jerusalem Asia/Kabul Asia/Kamchatka Asia/Karachi Asia/Kashgar Asia/Kathmandu Asia/Katmandu Asia/Khandyga Asia/Kolkata Asia/Krasnoyarsk Asia/Kuala\_Lumpur Asia/Kuching Asia/Kuwait Asia/Macao Asia/Macau Asia/Magadan Asia/Makassar Asia/Manila Asia/Muscat Asia/Nicosia Asia/Novokuznetsk Asia/Novosibirsk Asia/Omsk Asia/Oral Asia/Phnom\_Penh Asia/Pontianak Asia/Pyongyang Asia/Qatar Asia/Qyzylorda Asia/Rangoon Asia/Riyadh Asia/Riyadh87 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
Asia/Riyadh88 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
Asia/Riyadh89 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
Asia/Saigon Asia/Sakhalin Asia/Samarkand Asia/Seoul Asia/Shanghai Asia/Singapore Asia/Taipei Asia/Tashkent Asia/Tbilisi Asia/Tehran Asia/Tel\_Aviv Asia/Thimbu Asia/Thimphu Asia/Tokyo Asia/Ujung\_Pandang Asia/Ulaanbaatar Asia/Ulan\_Bator Asia/Urumqi Asia/Ust-Nera Asia/Vientiane Asia/Vladivostok Asia/Yakutsk Asia/Yekaterinburg Asia/Yerevan Atlantic/Azores Atlantic/Bermuda Atlantic/Canary Atlantic/Cape\_Verde Atlantic/Faeroe Atlantic/Faroe Atlantic/Jan\_Mayen Atlantic/Madeira Atlantic/Reykjavik Atlantic/South\_Georgia Atlantic/St\_Helena Atlantic/Stanley Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken\_Hill Australia/Canberra Australia/Currie Australia/Darwin Australia/Eucla Australia/Hobart Australia/LHI Australia/Lindeman Australia/Lord\_Howe Australia/Melbourne Australia/NSW Australia/North Australia/Perth Australia/Queensland Australia/South Australia/Sydney Australia/Tasmania Australia/Victoria Australia/West Australia/Yancowinna Brazil/Acre Brazil/DeNoronha Brazil/East Brazil/West CET CST6CDT Canada/Atlantic Canada/Central Canada/East-Saskatchewan Canada/Eastern Canada/Mountain Canada/Newfoundland Canada/Pacific Canada/Saskatchewan Canada/Yukon Chile/Continental Chile/EasterIsland Cuba EET EST EST5EDT Egypt Eire Etc/GMT Etc/GMT+0 Etc/GMT+1 Etc/GMT+10 Etc/GMT+11 Etc/GMT+12 Etc/GMT+2 Etc/GMT+3 Etc/GMT+4 Etc/GMT+5 Etc/GMT+6 Etc/GMT+7 Etc/GMT+8 Etc/GMT+9 Etc/GMT-0 Etc/GMT-1 Etc/GMT-10 Etc/GMT-11 Etc/GMT-12 Etc/GMT-13 Etc/GMT-14 Etc/GMT-2 Etc/GMT-3 Etc/GMT-4 Etc/GMT-5 Etc/GMT-6 Etc/GMT-7 Etc/GMT-8 Etc/GMT-9 Etc/GMT0 Etc/Greenwich Etc/UCT Etc/UTC Etc/Universal Etc/Zulu Europe/Amsterdam Europe/Andorra Europe/Athens Europe/Belfast Europe/Belgrade Europe/Berlin Europe/Bratislava Europe/Brussels Europe/Bucharest Europe/Budapest Europe/Busingen Europe/Chisinau Europe/Copenhagen Europe/Dublin Europe/Gibraltar Europe/Guernsey Europe/Helsinki Europe/Isle\_of\_Man Europe/Istanbul Europe/Jersey Europe/Kaliningrad Europe/Kiev Europe/Lisbon Europe/Ljubljana Europe/London Europe/Luxembourg Europe/Madrid Europe/Malta Europe/Mariehamn Europe/Minsk Europe/Monaco Europe/Moscow Europe/Nicosia Europe/Oslo Europe/Paris Europe/Podgorica Europe/Prague Europe/Riga Europe/Rome Europe/Samara Europe/San\_Marino Europe/Sarajevo Europe/Simferopol Europe/Skopje Europe/Sofia Europe/Stockholm Europe/Tallinn Europe/Tirane Europe/Tiraspol Europe/Uzhgorod Europe/Vaduz Europe/Vatican Europe/Vienna Europe/Vilnius Europe/Volgograd Europe/Warsaw Europe/Zagreb Europe/Zaporozhye Europe/Zurich GB GB-Eire GMT GMT+0 GMT-0 GMT0 Greenwich HST Hongkong Iceland Indian/Antananarivo Indian/Chagos Indian/Christmas Indian/Cocos Indian/Comoro Indian/Kerguelen Indian/Mahe Indian/Maldives Indian/Mauritius Indian/Mayotte Indian/Reunion Iran Israel Jamaica Japan Kwajalein Libya MET MST MST7MDT Mexico/BajaNorte Mexico/BajaSur Mexico/General Mideast/Riyadh87 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
Mideast/Riyadh88 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
Mideast/Riyadh89 - not supported in [latest Liquid version](/messaging/liquid/upgrade/#how-to-check-your-liquid-version)  
NZ NZ-CHAT Navajo PRC PST8PDT Pacific/Apia Pacific/Auckland Pacific/Chatham Pacific/Chuuk Pacific/Easter Pacific/Efate Pacific/Enderbury Pacific/Fakaofo Pacific/Fiji Pacific/Funafuti Pacific/Galapagos Pacific/Gambier Pacific/Guadalcanal Pacific/Guam Pacific/Honolulu Pacific/Johnston Pacific/Kiritimati Pacific/Kosrae Pacific/Kwajalein Pacific/Majuro Pacific/Marquesas Pacific/Midway Pacific/Nauru Pacific/Niue Pacific/Norfolk Pacific/Noumea Pacific/Pago\_Pago Pacific/Palau Pacific/Pitcairn Pacific/Pohnpei Pacific/Ponape Pacific/Port\_Moresby Pacific/Rarotonga Pacific/Saipan Pacific/Samoa Pacific/Tahiti Pacific/Tarawa Pacific/Tongatapu Pacific/Truk Pacific/Wake Pacific/Wallis Pacific/Yap Poland Portugal ROC ROK Singapore Turkey UCT US/Alaska US/Aleutian US/Arizona US/Central US/East-Indiana US/Eastern US/Hawaii US/Indiana-Starke US/Michigan US/Mountain US/Pacific US/Pacific-New US/Samoa UTC Universal W-SU WET Zulu

### A note on Etc/GMT time zones

We support Etc/GMT time zones, but note that the standard is not intuitive. Etc/GMT+2, for instance, means two hours BEHIND GMT, though you might expect it to be ahead because of the “+”. “+” translates to behind GMT and “-” translates to ahead of GMT:

*   Etc/GMT+2 - two hours behind GMT
*   Etc/GMT-2 - two hours ahead of GMT

## Detailed Format

Remember this format is supported in our emails and attributes. It **IS NOT** supported for the [Time Zone Match](/messaging/send/timezones/match/) feature. For that, use the [Region format](#region-format) above instead.

(GMT-11:00) American Samoa (GMT-11:00) International Date Line West (GMT-11:00) Midway Island (GMT-10:00) Hawaii (GMT-09:00) Alaska (GMT-08:00) Pacific Time (US & Canada) (GMT-08:00) Tijuana (GMT-07:00) Arizona (GMT-07:00) Chihuahua (GMT-07:00) Mazatlan (GMT-07:00) Mountain Time (US & Canada) (GMT-06:00) Central America (GMT-06:00) Central Time (US & Canada) (GMT-06:00) Guadalajara (GMT-06:00) Mexico City (GMT-06:00) Monterrey (GMT-06:00) Saskatchewan (GMT-05:00) Bogota (GMT-05:00) Eastern Time (US & Canada) (GMT-05:00) Indiana (East) (GMT-05:00) Lima (GMT-05:00) Quito (GMT-04:30) Caracas (GMT-04:00) Atlantic Time (Canada) (GMT-04:00) Georgetown (GMT-04:00) La Paz (GMT-04:00) Santiago (GMT-03:30) Newfoundland (GMT-03:00) Brasilia (GMT-03:00) Buenos Aires (GMT-03:00) Greenland (GMT-02:00) Mid-Atlantic (GMT-01:00) Azores (GMT-01:00) Cape Verde Is. (GMT+00:00) Casablanca (GMT+00:00) Dublin (GMT+00:00) Edinburgh (GMT+00:00) Lisbon (GMT+00:00) London (GMT+00:00) Monrovia (GMT+00:00) UTC (GMT+01:00) Amsterdam (GMT+01:00) Belgrade (GMT+01:00) Berlin (GMT+01:00) Bern (GMT+01:00) Bratislava (GMT+01:00) Brussels (GMT+01:00) Budapest (GMT+01:00) Copenhagen (GMT+01:00) Ljubljana (GMT+01:00) Madrid (GMT+01:00) Paris (GMT+01:00) Prague (GMT+01:00) Rome (GMT+01:00) Sarajevo (GMT+01:00) Skopje (GMT+01:00) Stockholm (GMT+01:00) Vienna (GMT+01:00) Warsaw (GMT+01:00) West Central Africa (GMT+01:00) Zagreb (GMT+02:00) Athens (GMT+02:00) Bucharest (GMT+02:00) Cairo (GMT+02:00) Harare (GMT+02:00) Helsinki (GMT+02:00) Istanbul (GMT+02:00) Jerusalem (GMT+02:00) Kyiv (GMT+02:00) Pretoria (GMT+02:00) Riga (GMT+02:00) Sofia (GMT+02:00) Tallinn (GMT+02:00) Vilnius (GMT+03:00) Baghdad (GMT+03:00) Kuwait (GMT+03:00) Minsk (GMT+03:00) Nairobi (GMT+03:00) Riyadh (GMT+03:30) Tehran (GMT+04:00) Abu Dhabi (GMT+04:00) Baku (GMT+04:00) Moscow (GMT+04:00) Muscat (GMT+04:00) St. Petersburg (GMT+04:00) Tbilisi (GMT+04:00) Volgograd (GMT+04:00) Yerevan (GMT+04:30) Kabul (GMT+05:00) Islamabad (GMT+05:00) Karachi (GMT+05:00) Tashkent (GMT+05:30) Chennai (GMT+05:30) Kolkata (GMT+05:30) Mumbai (GMT+05:30) New Delhi (GMT+05:30) Sri Jayawardenepura (GMT+05:45) Kathmandu (GMT+06:00) Almaty (GMT+06:00) Astana (GMT+06:00) Dhaka (GMT+06:00) Ekaterinburg (GMT+06:30) Rangoon (GMT+07:00) Bangkok (GMT+07:00) Hanoi (GMT+07:00) Jakarta (GMT+07:00) Novosibirsk (GMT+08:00) Beijing (GMT+08:00) Chongqing (GMT+08:00) Hong Kong (GMT+08:00) Krasnoyarsk (GMT+08:00) Kuala Lumpur (GMT+08:00) Perth (GMT+08:00) Singapore (GMT+08:00) Taipei (GMT+08:00) Ulaan Bataar (GMT+08:00) Urumqi (GMT+09:00) Irkutsk (GMT+09:00) Osaka (GMT+09:00) Sapporo (GMT+09:00) Seoul (GMT+09:00) Tokyo (GMT+09:30) Adelaide (GMT+09:30) Darwin (GMT+10:00) Brisbane (GMT+10:00) Canberra (GMT+10:00) Guam (GMT+10:00) Hobart (GMT+10:00) Melbourne (GMT+10:00) Port Moresby (GMT+10:00) Sydney (GMT+10:00) Yakutsk (GMT+11:00) New Caledonia (GMT+11:00) Vladivostok (GMT+12:00) Auckland (GMT+12:00) Fiji (GMT+12:00) Kamchatka (GMT+12:00) Magadan (GMT+12:00) Marshall Is. (GMT+12:00) Solomon Is. (GMT+12:00) Wellington (GMT+13:00) Nuku’alofa (GMT+13:00) Samoa (GMT+13:00) Tokelau Is.

*   *   [Region Format](#region-format)
        *   [A note on Etc/GMT time zones](#a-note-on-etcgmt-time-zones)
    *   [Detailed Format](#detailed-format)

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