Timezone Reference

When creating schedules with Cronhost, you need to specify a timezone using IANA timezone identifiers. This ensures your scheduled HTTP requests run at the correct local time, regardless of where our servers are located.

Overview

IANA (Internet Assigned Numbers Authority) timezone identifiers are standardized timezone names that handle daylight saving time transitions automatically. When you specify "0 9 * * *" (9 AM daily) with timezone "America/New_York", Cronhost will:

Run at 9 AM EST during winter months
Run at 9 AM EDT during summer months
Handle the DST transitions automatically

Always use IANA identifiers like "America/New_York" instead of abbreviations like "EST" or "PST". Abbreviations don’t handle daylight saving time correctly.

Quick Examples

Here are some common timezone examples for creating Cronhost schedules:

curl -X POST "https://cronho.st/api/v1/schedules" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Daily Report",
    "cronExpression": "0 9 * * *",
    "timezone": "America/New_York",
    "endpoint": "https://api.example.com/report"
  }'

Popular Timezones

Most commonly used timezone identifiers:

Timezone	Identifier	Description
🇺🇸 Eastern Time	`America/New_York`	US East Coast (EST/EDT)
🇺🇸 Central Time	`America/Chicago`	US Central (CST/CDT)
🇺🇸 Mountain Time	`America/Denver`	US Mountain (MST/MDT)
🇺🇸 Pacific Time	`America/Los_Angeles`	US West Coast (PST/PDT)
🇬🇧 London	`Europe/London`	UK (GMT/BST)
🇪🇺 Central Europe	`Europe/Berlin`	CET/CEST
🇯🇵 Tokyo	`Asia/Tokyo`	Japan Standard Time
🇦🇺 Sydney	`Australia/Sydney`	Australian Eastern Time
🌍 UTC	`UTC`	Coordinated Universal Time

Complete IANA Timezone List

Africa

Africa/Abidjan - Côte d’Ivoire
Africa/Accra - Ghana
Africa/Addis_Ababa - Ethiopia
Africa/Algiers - Algeria
Africa/Asmara - Eritrea
Africa/Bamako - Mali
Africa/Bangui - Central African Republic
Africa/Banjul - Gambia
Africa/Bissau - Guinea-Bissau
Africa/Blantyre - Malawi
Africa/Brazzaville - Republic of the Congo
Africa/Bujumbura - Burundi
Africa/Cairo - Egypt
Africa/Casablanca - Morocco
Africa/Ceuta - Spain (Ceuta)
Africa/Conakry - Guinea
Africa/Dakar - Senegal
Africa/Dar_es_Salaam - Tanzania
Africa/Djibouti - Djibouti
Africa/Douala - Cameroon
Africa/El_Aaiun - Western Sahara
Africa/Freetown - Sierra Leone
Africa/Gaborone - Botswana
Africa/Harare - Zimbabwe
Africa/Johannesburg - South Africa
Africa/Juba - South Sudan
Africa/Kampala - Uganda
Africa/Khartoum - Sudan
Africa/Kigali - Rwanda
Africa/Kinshasa - Democratic Republic of the Congo (west)
Africa/Lagos - Nigeria
Africa/Libreville - Gabon
Africa/Lome - Togo
Africa/Luanda - Angola
Africa/Lubumbashi - Democratic Republic of the Congo (east)
Africa/Lusaka - Zambia
Africa/Malabo - Equatorial Guinea
Africa/Maputo - Mozambique
Africa/Maseru - Lesotho
Africa/Mbabane - Eswatini
Africa/Mogadishu - Somalia
Africa/Monrovia - Liberia
Africa/Nairobi - Kenya
Africa/Ndjamena - Chad
Africa/Niamey - Niger
Africa/Nouakchott - Mauritania
Africa/Ouagadougou - Burkina Faso
Africa/Porto-Novo - Benin
Africa/Sao_Tome - São Tomé and Príncipe
Africa/Tripoli - Libya
Africa/Tunis - Tunisia
Africa/Windhoek - Namibia

America

North America

America/Adak - Alaska (Aleutian Islands)
America/Anchorage - Alaska
America/Anguilla - Anguilla
America/Antigua - Antigua and Barbuda
America/Aruba - Aruba
America/Atka - Alaska (deprecated, use America/Adak)
America/Barbados - Barbados
America/Belize - Belize
America/Blanc-Sablon - Quebec, Canada
America/Boise - Idaho, USA
America/Cambridge_Bay - Nunavut, Canada
America/Cancun - Mexico
America/Cayman - Cayman Islands
America/Chicago - Central Time (US & Canada)
America/Chihuahua - Mexico
America/Costa_Rica - Costa Rica
America/Creston - British Columbia, Canada
America/Curacao - Curaçao
America/Danmarkshavn - Greenland
America/Dawson - Yukon, Canada
America/Dawson_Creek - British Columbia, Canada
America/Denver - Mountain Time (US & Canada)
America/Detroit - Eastern Time (US & Canada)
America/Dominica - Dominica
America/Edmonton - Alberta, Canada
America/Eirunepe - Brazil
America/El_Salvador - El Salvador
America/Fort_Nelson - British Columbia, Canada
America/Glace_Bay - Nova Scotia, Canada
America/Godthab - Greenland (deprecated, use America/Nuuk)
America/Goose_Bay - Newfoundland and Labrador, Canada
America/Grand_Turk - Turks and Caicos Islands
America/Grenada - Grenada
America/Guadeloupe - Guadeloupe
America/Guatemala - Guatemala
America/Guayaquil - Ecuador
America/Guyana - Guyana
America/Halifax - Atlantic Time (Canada)
America/Havana - Cuba
America/Hermosillo - Mexico
America/Indiana/Indianapolis - Indiana, USA (Eastern Time)
America/Indiana/Knox - Indiana, USA (Central Time)
America/Indiana/Marengo - Indiana, USA (Eastern Time)
America/Indiana/Petersburg - Indiana, USA (Eastern Time)
America/Indiana/Tell_City - Indiana, USA (Central Time)
America/Indiana/Vevay - Indiana, USA (Eastern Time)
America/Indiana/Vincennes - Indiana, USA (Eastern Time)
America/Indiana/Winamac - Indiana, USA (Eastern Time)
America/Inuvik - Northwest Territories, Canada
America/Iqaluit - Nunavut, Canada
America/Jamaica - Jamaica
America/Juneau - Alaska, USA
America/Kentucky/Louisville - Kentucky, USA (Eastern Time)
America/Kentucky/Monticello - Kentucky, USA (Eastern Time)
America/Kralendijk - Caribbean Netherlands
America/La_Paz - Bolivia
America/Lima - Peru
America/Los_Angeles - Pacific Time (US & Canada)
America/Lower_Princes - Caribbean Netherlands
America/Marigot - Saint Martin
America/Martinique - Martinique
America/Matamoros - Mexico
America/Mazatlan - Mexico
America/Menominee - Michigan, USA (Central Time)
America/Merida - Mexico
America/Metlakatla - Alaska, USA
America/Mexico_City - Mexico
America/Miquelon - Saint Pierre and Miquelon
America/Moncton - New Brunswick, Canada
America/Monterrey - Mexico
America/Montserrat - Montserrat
America/Nassau - Bahamas
America/New_York - Eastern Time (US & Canada)
America/Nipigon - Ontario, Canada
America/Nome - Alaska, USA
America/Noronha - Brazil
America/North_Dakota/Beulah - North Dakota, USA (Central Time)
America/North_Dakota/Center - North Dakota, USA (Central Time)
America/North_Dakota/New_Salem - North Dakota, USA (Central Time)
America/Nuuk - Greenland
America/Ojinaga - Mexico
America/Panama - Panama
America/Pangnirtung - Nunavut, Canada
America/Paramaribo - Suriname
America/Phoenix - Arizona, USA (Mountain Standard Time)
America/Port-au-Prince - Haiti
America/Port_of_Spain - Trinidad and Tobago
America/Porto_Velho - Brazil
America/Puerto_Rico - Puerto Rico
America/Punta_Arenas - Chile
America/Rainy_River - Ontario, Canada
America/Rankin_Inlet - Nunavut, Canada
America/Recife - Brazil
America/Regina - Saskatchewan, Canada
America/Resolute - Nunavut, Canada
America/Rio_Branco - Brazil
America/Santarem - Brazil
America/Santiago - Chile
America/Santo_Domingo - Dominican Republic
America/Sao_Paulo - Brazil
America/Scoresbysund - Greenland
America/Sitka - Alaska, USA
America/St_Barthelemy - Saint Barthélemy
America/St_Johns - Newfoundland Time (Canada)
America/St_Kitts - Saint Kitts and Nevis
America/St_Lucia - Saint Lucia
America/St_Thomas - U.S. Virgin Islands
America/St_Vincent - Saint Vincent and the Grenadines
America/Swift_Current - Saskatchewan, Canada
America/Tegucigalpa - Honduras
America/Thule - Greenland
America/Thunder_Bay - Ontario, Canada
America/Tijuana - Mexico
America/Toronto - Eastern Time (Canada)
America/Tortola - British Virgin Islands
America/Vancouver - Pacific Time (Canada)
America/Whitehorse - Yukon, Canada
America/Winnipeg - Central Time (Canada)
America/Yakutat - Alaska, USA
America/Yellowknife - Northwest Territories, Canada

South America

America/Argentina/Buenos_Aires - Argentina
America/Argentina/Catamarca - Argentina
America/Argentina/Cordoba - Argentina
America/Argentina/Jujuy - Argentina
America/Argentina/La_Rioja - Argentina
America/Argentina/Mendoza - Argentina
America/Argentina/Rio_Gallegos - Argentina
America/Argentina/Salta - Argentina
America/Argentina/San_Juan - Argentina
America/Argentina/San_Luis - Argentina
America/Argentina/Tucuman - Argentina
America/Argentina/Ushuaia - Argentina
America/Asuncion - Paraguay
America/Bahia - Brazil
America/Bahia_Banderas - Mexico
America/Belem - Brazil
America/Boa_Vista - Brazil
America/Bogota - Colombia
America/Brasilia - Brazil
America/Campo_Grande - Brazil
America/Caracas - Venezuela
America/Cayenne - French Guiana
America/Cuiaba - Brazil
America/Fortaleza - Brazil
America/Maceio - Brazil
America/Manaus - Brazil
America/Montevideo - Uruguay

Antarctica

Antarctica/Casey - Casey Station
Antarctica/Davis - Davis Station
Antarctica/DumontDUrville - Dumont d’Urville Station
Antarctica/Macquarie - Macquarie Island
Antarctica/Mawson - Mawson Station
Antarctica/McMurdo - McMurdo Station
Antarctica/Palmer - Palmer Station
Antarctica/Rothera - Rothera Station
Antarctica/Syowa - Syowa Station
Antarctica/Troll - Troll Station
Antarctica/Vostok - Vostok Station

Arctic

Arctic/Longyearbyen - Svalbard and Jan Mayen

Asia

Asia/Aden - Yemen
Asia/Almaty - Kazakhstan
Asia/Amman - Jordan
Asia/Anadyr - Russia
Asia/Aqtau - Kazakhstan
Asia/Aqtobe - Kazakhstan
Asia/Ashgabat - Turkmenistan
Asia/Atyrau - Kazakhstan
Asia/Baghdad - Iraq
Asia/Bahrain - Bahrain
Asia/Baku - Azerbaijan
Asia/Bangkok - Thailand
Asia/Barnaul - Russia
Asia/Beirut - Lebanon
Asia/Bishkek - Kyrgyzstan
Asia/Brunei - Brunei
Asia/Chita - Russia
Asia/Choibalsan - Mongolia
Asia/Colombo - Sri Lanka
Asia/Damascus - Syria
Asia/Dhaka - Bangladesh
Asia/Dili - East Timor
Asia/Dubai - United Arab Emirates
Asia/Dushanbe - Tajikistan
Asia/Famagusta - Cyprus
Asia/Gaza - Palestine
Asia/Hebron - Palestine
Asia/Ho_Chi_Minh - Vietnam
Asia/Hong_Kong - Hong Kong
Asia/Hovd - Mongolia
Asia/Irkutsk - Russia
Asia/Jakarta - Indonesia (western)
Asia/Jayapura - Indonesia (eastern)
Asia/Jerusalem - Israel
Asia/Kabul - Afghanistan
Asia/Kamchatka - Russia
Asia/Karachi - Pakistan
Asia/Kathmandu - Nepal
Asia/Khandyga - Russia
Asia/Kolkata - India
Asia/Krasnoyarsk - Russia
Asia/Kuala_Lumpur - Malaysia
Asia/Kuching - Malaysia (Borneo)
Asia/Kuwait - Kuwait
Asia/Macau - Macao
Asia/Magadan - Russia
Asia/Makassar - Indonesia (central)
Asia/Manila - Philippines
Asia/Muscat - Oman
Asia/Nicosia - Cyprus
Asia/Novokuznetsk - Russia
Asia/Novosibirsk - Russia
Asia/Omsk - Russia
Asia/Oral - Kazakhstan
Asia/Phnom_Penh - Cambodia
Asia/Pontianak - Indonesia (western)
Asia/Pyongyang - North Korea
Asia/Qatar - Qatar
Asia/Qostanay - Kazakhstan
Asia/Qyzylorda - Kazakhstan
Asia/Riyadh - Saudi Arabia
Asia/Sakhalin - Russia
Asia/Samarkand - Uzbekistan
Asia/Seoul - South Korea
Asia/Shanghai - China
Asia/Singapore - Singapore
Asia/Srednekolymsk - Russia
Asia/Taipei - Taiwan
Asia/Tashkent - Uzbekistan
Asia/Tbilisi - Georgia
Asia/Tehran - Iran
Asia/Thimphu - Bhutan
Asia/Tokyo - Japan
Asia/Tomsk - Russia
Asia/Ulaanbaatar - Mongolia
Asia/Urumqi - China (western)
Asia/Ust-Nera - Russia
Asia/Vientiane - Laos
Asia/Vladivostok - Russia
Asia/Yakutsk - Russia
Asia/Yangon - Myanmar
Asia/Yekaterinburg - Russia
Asia/Yerevan - Armenia

Atlantic

Atlantic/Azores - Portugal (Azores)
Atlantic/Bermuda - Bermuda
Atlantic/Canary - Spain (Canary Islands)
Atlantic/Cape_Verde - Cape Verde
Atlantic/Faroe - Faroe Islands
Atlantic/Madeira - Portugal (Madeira)
Atlantic/Reykjavik - Iceland
Atlantic/South_Georgia - South Georgia and the South Sandwich Islands
Atlantic/St_Helena - Saint Helena
Atlantic/Stanley - Falkland Islands

Australia

Australia/Adelaide - South Australia
Australia/Brisbane - Queensland
Australia/Broken_Hill - New South Wales (far west)
Australia/Currie - Tasmania (King Island)
Australia/Darwin - Northern Territory
Australia/Eucla - Western Australia (border area)
Australia/Hobart - Tasmania
Australia/Lindeman - Queensland (Whitsunday Islands)
Australia/Lord_Howe - Lord Howe Island
Australia/Melbourne - Victoria
Australia/Perth - Western Australia
Australia/Sydney - New South Wales

Europe

Europe/Amsterdam - Netherlands
Europe/Andorra - Andorra
Europe/Astrakhan - Russia
Europe/Athens - Greece
Europe/Belgrade - Serbia
Europe/Berlin - Germany
Europe/Bratislava - Slovakia
Europe/Brussels - Belgium
Europe/Bucharest - Romania
Europe/Budapest - Hungary
Europe/Busingen - Germany
Europe/Chisinau - Moldova
Europe/Copenhagen - Denmark
Europe/Dublin - Ireland
Europe/Gibraltar - Gibraltar
Europe/Guernsey - Guernsey
Europe/Helsinki - Finland
Europe/Isle_of_Man - Isle of Man
Europe/Istanbul - Turkey
Europe/Jersey - Jersey
Europe/Kaliningrad - Russia
Europe/Kiev - Ukraine
Europe/Kirov - Russia
Europe/Lisbon - Portugal
Europe/Ljubljana - Slovenia
Europe/London - United Kingdom
Europe/Luxembourg - Luxembourg
Europe/Madrid - Spain
Europe/Malta - Malta
Europe/Mariehamn - Finland (Åland Islands)
Europe/Minsk - Belarus
Europe/Monaco - Monaco
Europe/Moscow - Russia
Europe/Oslo - Norway
Europe/Paris - France
Europe/Podgorica - Montenegro
Europe/Prague - Czech Republic
Europe/Riga - Latvia
Europe/Rome - Italy
Europe/Samara - Russia
Europe/San_Marino - San Marino
Europe/Sarajevo - Bosnia and Herzegovina
Europe/Saratov - Russia
Europe/Simferopol - Russia (Crimea)
Europe/Skopje - North Macedonia
Europe/Sofia - Bulgaria
Europe/Stockholm - Sweden
Europe/Tallinn - Estonia
Europe/Tirane - Albania
Europe/Ulyanovsk - Russia
Europe/Uzhgorod - Ukraine
Europe/Vaduz - Liechtenstein
Europe/Vatican - Vatican City
Europe/Vienna - Austria
Europe/Vilnius - Lithuania
Europe/Volgograd - Russia
Europe/Warsaw - Poland
Europe/Zagreb - Croatia
Europe/Zaporozhye - Ukraine
Europe/Zurich - Switzerland

Indian

Indian/Antananarivo - Madagascar
Indian/Chagos - British Indian Ocean Territory
Indian/Christmas - Christmas Island
Indian/Cocos - Cocos (Keeling) Islands
Indian/Comoro - Comoros
Indian/Kerguelen - French Southern Territories
Indian/Mahe - Seychelles
Indian/Maldives - Maldives
Indian/Mauritius - Mauritius
Indian/Mayotte - Mayotte
Indian/Reunion - Réunion

Pacific

Pacific/Apia - Samoa
Pacific/Auckland - New Zealand
Pacific/Bougainville - Papua New Guinea
Pacific/Chatham - New Zealand (Chatham Islands)
Pacific/Chuuk - Federated States of Micronesia
Pacific/Easter - Chile (Easter Island)
Pacific/Efate - Vanuatu
Pacific/Enderbury - Kiribati
Pacific/Fakaofo - Tokelau
Pacific/Fiji - Fiji
Pacific/Funafuti - Tuvalu
Pacific/Galapagos - Ecuador (Galápagos Islands)
Pacific/Gambier - French Polynesia (Gambier Islands)
Pacific/Guadalcanal - Solomon Islands
Pacific/Guam - Guam
Pacific/Honolulu - Hawaii, USA
Pacific/Johnston - Johnston Atoll
Pacific/Kanton - Kiribati
Pacific/Kiritimati - Kiribati
Pacific/Kosrae - Federated States of Micronesia
Pacific/Kwajalein - Marshall Islands
Pacific/Majuro - Marshall Islands
Pacific/Marquesas - French Polynesia (Marquesas Islands)
Pacific/Midway - United States Minor Outlying Islands
Pacific/Nauru - Nauru
Pacific/Niue - Niue
Pacific/Norfolk - Norfolk Island
Pacific/Noumea - New Caledonia
Pacific/Pago_Pago - American Samoa
Pacific/Palau - Palau
Pacific/Pitcairn - Pitcairn Islands
Pacific/Pohnpei - Federated States of Micronesia
Pacific/Port_Moresby - Papua New Guinea
Pacific/Rarotonga - Cook Islands
Pacific/Saipan - Northern Mariana Islands
Pacific/Tahiti - French Polynesia (Society Islands)
Pacific/Tarawa - Kiribati
Pacific/Tongatapu - Tonga
Pacific/Wake - Wake Island
Pacific/Wallis - Wallis and Futuna

UTC

UTC - Coordinated Universal Time

Best Practices for Cronhost

Always use IANA identifiers - Never use abbreviations like “EST” or “PST”
Test DST transitions - Verify your schedules work correctly during spring/fall time changes
Use UTC for global services - If your API serves global users, consider UTC
Be specific with locations - Use America/New_York instead of generic EST
Document your choice - Include timezone reasoning in your schedule descriptions

Schedule Examples by Region

US Business Hours

// East Coast business hours (9 AM - 5 PM ET)
const eastCoastSchedule = await cronhost.createSchedule({
  name: "East Coast Business Hours Check",
  cronExpression: "0 9-17 * * 1-5", // Weekdays 9 AM - 5 PM
  timezone: "America/New_York",
});

// West Coast business hours (9 AM - 5 PM PT)
const westCoastSchedule = await cronhost.createSchedule({
  name: "West Coast Business Hours Check",
  cronExpression: "0 9-17 * * 1-5", // Weekdays 9 AM - 5 PM
  timezone: "America/Los_Angeles",
});

Global Monitoring

// Global service monitoring every hour
const globalMonitoring = await cronhost.createSchedule({
  name: "Global API Health Check",
  cronExpression: "0 * * * *", // Every hour
  timezone: "UTC", // Consistent global timing
});

European Operations

// European business hours monitoring
const europeanSchedule = await cronhost.createSchedule({
  name: "European Business Hours",
  cronExpression: "0 8-18 * * 1-5", // Weekdays 8 AM - 6 PM
  timezone: "Europe/London", // Handles GMT/BST automatically
});

Common Gotchas

Daylight Saving Time: When DST transitions occur, some times may be skipped (spring forward) or occur twice (fall back). Cronhost handles this automatically, but be aware:

Spring Forward: 2:30 AM might be skipped entirely

Fall Back: 2:30 AM might run twice

Arizona Exception: Most of Arizona doesn’t observe DST. Use America/Phoenix for consistent Mountain Standard Time year-round.

Need Help?

Testing schedules? Use the Cronhost Dashboard to manually trigger and verify timing
Questions? Contact us at help@cronho.st

Get Started

Reference

​Timezone Reference

​Overview

​Quick Examples

​Popular Timezones

​Complete IANA Timezone List

​Africa

​America

​North America

​South America

​Antarctica

​Arctic

​Asia

​Atlantic

​Australia

​Europe

​Indian

​Pacific

​UTC

​Best Practices for Cronhost

​Schedule Examples by Region

​US Business Hours

​Global Monitoring

​European Operations

​Common Gotchas

​Need Help?

Timezone Reference

Overview

Quick Examples

Popular Timezones

Complete IANA Timezone List

Africa

America

North America

South America

Antarctica

Arctic

Asia

Atlantic

Australia

Europe

Indian

Pacific

UTC

Best Practices for Cronhost

Schedule Examples by Region

US Business Hours

Global Monitoring

European Operations

Common Gotchas

Need Help?