When setting up an Outbound User (Sender/APIKey), you can select the default TimeZone. This is used for calculating delayed message send times and is used on webhooks and reports.

This default TimeZone can be overridden when submitting messages via the API by setting the 'TimeZone' value.

The possible values for TimeZone are:

TimeZone Description
Dateline (GMT-12:00) Eniwetok, Kwajalein
Samoa (GMT-11:00) Midway Island, Samoa
Hawaiian (GMT-10:00) Hawaii
Alaskan (GMT-09:00) Alaska
Pacific (GMT-08:00) Pacific Time (US & Canada); Tijuana
US Mountain (GMT-07:00) Arizona
Mountain (GMT-07:00) Mountain Time (US & Canada)
Central America (GMT-06:00) Central America
Central (GMT-06:00) Central Time (US & Canada)
Mexico (GMT-06:00) Mexico City
Canada Central (GMT-06:00) Saskatchewan
SA Pacific (GMT-05:00) Bogota, Lima, Quito
Eastern (GMT-05:00) Eastern Time (US & Canada)
US Eastern (GMT-05:00) Indiana (East)
Atlantic Daylight Time (GMT-04:00) Atlantic Time (Canada)
SA Western (GMT-04:00) Caracas, La Paz
Pacific SA (GMT-04:00) Santiago
Newfoundland (GMT-03:30) Newfoundland
E. South America (GMT-03:00) Brasilia
SA Eastern (GMT-03:00) Buenos Aires, Georgetown
Greenland (GMT-03:00) Greenland
Mid-Atlantic (GMT-02:00) Mid-Atlantic
Azores (GMT-01:00) Azores
Cape Verde (GMT-01:00) Cape Verde Is.
Greenwich (GMT) Casablanca, Monrovia
GMT (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London
W. Europe (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
Central Europe (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague
Romance (GMT+01:00) Brussels, Copenhagen, Madrid, Paris
Central European (GMT+01:00) Sarajevo, Skopje, Sofija, Vilnius, Warsaw, Zagreb
W. Central Africa (GMT+01:00) West Central Africa
GTB (GMT+02:00) Athens, Istanbul, Minsk
E. Europe (GMT+02:00) Bucharest
Egypt (GMT+02:00) Cairo
South Africa (GMT+02:00) Harare, Pretoria
FLE (GMT+02:00) Helsinki, Riga, Tallinn
Jerusalem (GMT+02:00) Jerusalem
Arabic (GMT+03:00) Baghdad
Arab (GMT+03:00) Kuwait, Riyadh
Russian (GMT+03:00) Moscow, St. Petersburg, Volgograd
E. Africa (GMT+03:00) Nairobi
Iran (GMT+03:30) Tehran
Arabian (GMT+04:00) Abu Dhabi, Muscat
Caucasus (GMT+04:00) Baku, Tbilisi, Yerevan
Afghanistan (GMT+04:30) Kabul
Ekaterinburg (GMT+05:00) Ekaterinburg
West Asia (GMT+05:00) Islamabad, Karachi, Tashkent
India (GMT+05:30) Calcutta, Chennai, Mumbai, New Delhi
Nepal (GMT+05:45) Kathmandu
N. Central Asia (GMT+06:00) Almaty, Novosibirsk
Central Asia (GMT+06:00) Astana, Dhaka
Sri Lanka (GMT+06:00) Sri Jayawardenepura
Myanmar (GMT+06:30) Rangoon
SE Asia (GMT+07:00) Bangkok, Hanoi, Jakarta
North Asia (GMT+07:00) Krasnoyarsk
China (GMT+08:00) Beijing, Chongqing, Hong Kong, Urumqi
North Asia East (GMT+08:00) Irkutsk, Ulaan Bataar
Malay Peninsula (GMT+08:00) Kuala Lumpur, Singapore
W. Australia (GMT+08:00) Perth
Taipei (GMT+08:00) Taipei
Tokyo (GMT+09:00) Osaka, Sapporo, Tokyo
Korea (GMT+09:00) Seoul
Yakutsk (GMT+09:00) Yakutsk
Cen. Australia (GMT+09:30) Adelaide
AUS Central (GMT+09:30) Darwin
E. Australia (GMT+10:00) Brisbane
AUS Eastern (GMT+10:00) Canberra, Melbourne, Sydney
West Pacific (GMT+10:00) Guam, Port Moresby
Tasmania (GMT+10:00) Hobart
Vladivostok (GMT+10:00) Vladivostok
Central Pacific (GMT+11:00) Magadan, Solomon Is., New Caledonia
New Zealand (GMT+12:00) Auckland, Wellington
Fiji (GMT+12:00) Fiji, Kamchatka, Marshall Is.
Tonga (GMT+13:00) Nuku'alofa