The time zone abbreviations we support include:

Abbreviation Timezone Nickname
PT Pacific Time (US & Canada)
PST Pacific Time (US & Canada)
PDT Pacific Time (US & Canada)
MT Mountain Time (US & Canada)
MDT Mountain Time (US & Canada)
MST Mountain Time (US & Canada)
CT Central Time (US & Canada)
CDT Central Time (US & Canada)
CST Central Time (US & Canada)
ET Eastern Time (US & Canada)
EDT Eastern Time (US & Canada)
EST Eastern Time (US & Canada)
HT Hawaii
HDT Hawaii
HST Hawaii
AZ Arizona

We also support any of the following nicknames or official names:

Nickname Official Name
International Date Line West Pacific/Midway
Midway Island Pacific/Midway
American Samoa Pacific/Pago_Pago
Hawaii Pacific/Honolulu
Alaska America/Juneau
Pacific Time (US & Canada) America/Los_Angeles
Tijuana America/Tijuana
Mountain Time (US & Canada) America/Denver
Arizona America/Phoenix
Chihuahua America/Chihuahua
Mazatlan America/Mazatlan
Central Time (US & Canada) America/Chicago
Saskatchewan America/Regina
Guadalajara America/Mexico_City
Mexico City America/Mexico_City
Monterrey America/Monterrey
Central America America/Guatemala
Eastern Time (US & Canada) America/New_York
Indiana (East) America/Indiana/Indianapolis
Bogota America/Bogota
Lima America/Lima
Quito America/Lima
Atlantic Time (Canada) America/Halifax
Caracas America/Caracas
La Paz America/La_Paz
Santiago America/Santiago
Newfoundland America/St_Johns
Brasilia America/Sao_Paulo
Buenos Aires America/Argentina/Buenos_Aires
Montevideo America/Montevideo
Georgetown America/Guyana
Greenland America/Godthab
Mid-Atlantic Atlantic/South_Georgia
Azores Atlantic/Azores
Cape Verde Is. Atlantic/Cape_Verde
Dublin Europe/Dublin
Edinburgh Europe/London
Lisbon Europe/Lisbon
London Europe/London
Casablanca Africa/Casablanca
Monrovia Africa/Monrovia
UTC Etc/UTC
Belgrade Europe/Belgrade
Bratislava Europe/Bratislava
Budapest Europe/Budapest
Ljubljana Europe/Ljubljana
Prague Europe/Prague
Sarajevo Europe/Sarajevo
Skopje Europe/Skopje
Warsaw Europe/Warsaw
Zagreb Europe/Zagreb
Brussels Europe/Brussels
Copenhagen Europe/Copenhagen
Madrid Europe/Madrid
Paris Europe/Paris
Amsterdam Europe/Amsterdam
Berlin Europe/Berlin
Bern Europe/Zurich
Zurich Europe/Zurich
Rome Europe/Rome
Stockholm Europe/Stockholm
Vienna Europe/Vienna
West Central Africa Africa/Algiers
Bucharest Europe/Bucharest
Cairo Africa/Cairo
Helsinki Europe/Helsinki
Kyiv Europe/Kiev
Riga Europe/Riga
Sofia Europe/Sofia
Tallinn Europe/Tallinn
Vilnius Europe/Vilnius
Athens Europe/Athens
Istanbul Europe/Istanbul
Minsk Europe/Minsk
Jerusalem Asia/Jerusalem
Harare Africa/Harare
Pretoria Africa/Johannesburg
Kaliningrad Europe/Kaliningrad
Moscow Europe/Moscow
St. Petersburg Europe/Moscow
Volgograd Europe/Volgograd
Samara Europe/Samara
Kuwait Asia/Kuwait
Riyadh Asia/Riyadh
Nairobi Africa/Nairobi
Baghdad Asia/Baghdad
Tehran Asia/Tehran
Abu Dhabi Asia/Muscat
Muscat Asia/Muscat
Baku Asia/Baku
Tbilisi Asia/Tbilisi
Yerevan Asia/Yerevan
Kabul Asia/Kabul
Ekaterinburg Asia/Yekaterinburg
Islamabad Asia/Karachi
Karachi Asia/Karachi
Tashkent Asia/Tashkent
Chennai Asia/Kolkata
Kolkata Asia/Kolkata
Mumbai Asia/Kolkata
New Delhi Asia/Kolkata
Kathmandu Asia/Kathmandu
Astana Asia/Dhaka
Dhaka Asia/Dhaka
Sri Jayawardenepura Asia/Colombo
Almaty Asia/Almaty
Novosibirsk Asia/Novosibirsk
Rangoon Asia/Rangoon
Bangkok Asia/Bangkok
Hanoi Asia/Bangkok
Jakarta Asia/Jakarta
Krasnoyarsk Asia/Krasnoyarsk
Beijing Asia/Shanghai
Chongqing Asia/Chongqing
Hong Kong Asia/Hong_Kong
Urumqi Asia/Urumqi
Kuala Lumpur Asia/Kuala_Lumpur
Singapore Asia/Singapore
Taipei Asia/Taipei
Perth Australia/Perth
Irkutsk Asia/Irkutsk
Ulaanbaatar Asia/Ulaanbaatar
Seoul Asia/Seoul
Osaka Asia/Tokyo
Sapporo Asia/Tokyo
Tokyo Asia/Tokyo
Yakutsk Asia/Yakutsk
Darwin Australia/Darwin
Adelaide Australia/Adelaide
Canberra Australia/Melbourne
Melbourne Australia/Melbourne
Sydney Australia/Sydney
Brisbane Australia/Brisbane
Hobart Australia/Hobart
Vladivostok Asia/Vladivostok
Guam Pacific/Guam
Port Moresby Pacific/Port_Moresby
Magadan Asia/Magadan
Srednekolymsk Asia/Srednekolymsk
Solomon Is. Pacific/Guadalcanal
New Caledonia Pacific/Noumea
Fiji Pacific/Fiji
Kamchatka Asia/Kamchatka
Marshall Is. Pacific/Majuro
Auckland Pacific/Auckland
Wellington Pacific/Auckland
Nuku’alofa Pacific/Tongatapu
Tokelau Is. Pacific/Fakaofo
Chatham Is. Pacific/Chatham
Samoa Pacific/Apia