Skip to main content.

Index numbers for [GuiUnattended]/TimeZone

The answer file uses a parameter named TimeZone in the [GuiUnattended] section to set the computer's time zone. The value of this parameter is an "index" which does not correspond to anything else on earth, as far as I can tell.

The index numbers are documented in (some of) Microsoft's guides to the answer file. You can also find them in your registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones, in the Index value below each time zone key.

For a long time, I could not find these anywhere on the World Wide Web, so I created the table below. Nowadays, Microsoft includes them in the on-line Server 2003 documentation for the [GuiUnattended] section. But I am leaving this page here anyway.

IndexTime ZoneDisplay Name
000Dateline Standard Time (GMT-12:00)International Date Line West
001Samoa Standard Time (GMT-11:00)Midway Island, Samoa
002Hawaiian Standard Time (GMT-10:00)Hawaii
003Alaskan Standard Time (GMT-09:00)Alaska
004Pacific Standard Time (GMT-08:00)Pacific Time (US and Canada); Tijuana
010Mountain Standard Time (GMT-07:00)Mountain Time (US and Canada)
013Mexico Standard Time 2 (GMT-07:00)Chihuahua, La Paz, Mazatlan
015U.S. Mountain Standard Time (GMT-07:00)Arizona
020Central Standard Time (GMT-06:00)Central Time (US and Canada)
025Canada Central Standard Time (GMT-06:00)Saskatchewan
030Mexico Standard Time (GMT-06:00)Guadalajara, Mexico City, Monterrey
033Central America Standard Time (GMT-06:00)Central America
035Eastern Standard Time (GMT-05:00)Eastern Time (US and Canada)
040U.S. Eastern Standard Time (GMT-05:00)Indiana (East)
045S.A. Pacific Standard Time (GMT-05:00)Bogota, Lima, Quito
050Atlantic Standard Time (GMT-04:00)Atlantic Time (Canada)
055S.A. Western Standard Time (GMT-04:00)Caracas, La Paz
056Pacific S.A. Standard Time (GMT-04:00)Santiago
060Newfoundland Standard Time (GMT-03:30)Newfoundland
065E. South America Standard Time (GMT-03:00)Brasilia
070S.A. Eastern Standard Time (GMT-03:00)Buenos Aires, Georgetown
073Greenland Standard Time (GMT-03:00)Greenland
075Mid-Atlantic Standard Time (GMT-02:00)Mid-Atlantic
080Azores Standard Time (GMT-01:00)Azores
083Cape Verde Standard Time (GMT-01:00)Cape Verde Islands
085GMT Standard Time (GMT)Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London
090Greenwich Standard Time (GMT)Casablanca, Monrovia
095Central Europe Standard Time (GMT+01:00)Belgrade, Bratislava, Budapest, Ljubljana, Prague
100Central European Standard Time (GMT+01:00)Sarajevo, Skopje, Warsaw, Zagreb
105Romance Standard Time (GMT+01:00)Brussels, Copenhagen, Madrid, Paris
110W. Europe Standard Time (GMT+01:00)Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna
113W. Central Africa Standard Time (GMT+01:00)West Central Africa
115E. Europe Standard Time (GMT+02:00)Bucharest
120Egypt Standard Time (GMT+02:00)Cairo
125FLE Standard Time (GMT+02:00)Helsinki, Kyiv, Riga, Sofia, Tallinn, Vilnius
130GTB Standard Time (GMT+02:00)Athens, Istanbul, Minsk
135Israel Standard Time (GMT+02:00)Jerusalem
140South Africa Standard Time (GMT+02:00)Harare, Pretoria
145Russian Standard Time (GMT+03:00)Moscow, St. Petersburg, Volgograd
150Arab Standard Time (GMT+03:00)Kuwait, Riyadh
155E. Africa Standard Time (GMT+03:00)Nairobi
158Arabic Standard Time (GMT+03:00)Baghdad
160Iran Standard Time (GMT+03:30)Tehran
165Arabian Standard Time (GMT+04:00)Abu Dhabi, Muscat
170Caucasus Standard Time (GMT+04:00)Baku, Tbilisi, Yerevan
175Afghanistan Standard Time (GMT+04:30)Kabul
180Ekaterinburg Standard Time (GMT+05:00)Ekaterinburg
185West Asia Standard Time (GMT+05:00)Islamabad, Karachi, Tashkent
190India Standard Time (GMT+05:30)Chennai, Kolkata, Mumbai, New Delhi
193Nepal Standard Time (GMT+05:45)Kathmandu
195Central Asia Standard Time (GMT+06:00)Astana, Dhaka
200Sri Lanka Standard Time (GMT+06:00)Sri Jayawardenepura
201N. Central Asia Standard Time (GMT+06:00)Almaty, Novosibirsk
203Myanmar Standard Time (GMT+06:30)Rangoon
205S.E. Asia Standard Time (GMT+07:00)Bangkok, Hanoi, Jakarta
207North Asia Standard Time (GMT+07:00)Krasnoyarsk
210China Standard Time (GMT+08:00)Beijing, Chongqing, Hong Kong SAR, Urumqi
215Singapore Standard Time (GMT+08:00)Kuala Lumpur, Singapore
220Taipei Standard Time (GMT+08:00)Taipei
225W. Australia Standard Time (GMT+08:00)Perth
227North Asia East Standard Time (GMT+08:00)Irkutsk, Ulaan Bataar
230Korea Standard Time (GMT+09:00)Seoul
235Tokyo Standard Time (GMT+09:00)Osaka, Sapporo, Tokyo
240Yakutsk Standard Time (GMT+09:00)Yakutsk
245A.U.S. Central Standard Time (GMT+09:30)Darwin
250Cen. Australia Standard Time (GMT+09:30)Adelaide
255A.U.S. Eastern Standard Time (GMT+10:00)Canberra, Melbourne, Sydney
260E. Australia Standard Time (GMT+10:00)Brisbane
265Tasmania Standard Time (GMT+10:00)Hobart
270Vladivostok Standard Time (GMT+10:00)Vladivostok
275West Pacific Standard Time (GMT+10:00)Guam, Port Moresby
280Central Pacific Standard Time (GMT+11:00)Magadan, Solomon Islands, New Caledonia
285Fiji Islands Standard Time (GMT+12:00)Fiji Islands, Kamchatka, Marshall Islands
290New Zealand Standard Time (GMT+12:00)Auckland, Wellington
300Tonga Standard Time (GMT+13:00)Nuku'alofa