When automating the Windows 7 deployment you can specify the timezone using the time zone code and name. A list of the time zones with their codes and names has been listed below.
This applies to the CustomSettings.ini, autounattend.xml and unattend.xml files.
For example, the Australian Eastern Standard Time is:
TimeZone=260 TimeZoneName=E. Australia Standard Time
000 Dateline Standard Time (GMT-12:00) International Date Line West 001 Samoa Standard Time (GMT-11:00) Midway Island, Samoa 002 Hawaiian Standard Time (GMT-10:00) Hawaii 003 Alaskan Standard Time (GMT-09:00) Alaska 004 Pacific Standard Time (GMT-08:00) Pacific Time (US and Canada); Tijuana 010 Mountain Standard Time (GMT-07:00) Mountain Time (US and Canada) 013 Mexico Standard Time 2 (GMT-07:00) Chihuahua, La Paz, Mazatlan 015 U.S. Mountain Standard Time (GMT-07:00) Arizona 020 Central Standard Time (GMT-06:00) Central Time (US and Canada) 025 Canada Central Standard Time (GMT-06:00) Saskatchewan 030 Mexico Standard Time (GMT-06:00) Guadalajara, Mexico City, Monterrey 033 Central America Standard Time (GMT-06:00) Central America 035 Eastern Standard Time (GMT-05:00) Eastern Time (US and Canada) 040 U.S. Eastern Standard Time (GMT-05:00) Indiana (East) 045 S.A. Pacific Standard Time (GMT-05:00) Bogota, Lima, Quito 050 Atlantic Standard Time (GMT-04:00) Atlantic Time (Canada) 055 S.A. Western Standard Time (GMT-04:00) Caracas, La Paz 056 Pacific S.A. Standard Time (GMT-04:00) Santiago 060 Newfoundland and Labrador Standard Time (GMT-03:30) Newfoundland and Labrador 065 E. South America Standard Time (GMT-03:00) Brasilia 070 S.A. Eastern Standard Time (GMT-03:00) Buenos Aires, Georgetown 073 Greenland Standard Time (GMT-03:00) Greenland 075 Mid-Atlantic Standard Time (GMT-02:00) Mid-Atlantic 080 Azores Standard Time (GMT-01:00) Azores 083 Cape Verde Standard Time (GMT-01:00) Cape Verde Islands 085 GMT Standard Time (GMT) Greenwich Mean Time : Dublin, Edinburgh, Lisbon, London 090 Greenwich Standard Time (GMT) Casablanca, Monrovia 095 Central Europe Standard Time (GMT+01:00) Belgrade, Bratislava, Budapest, Ljubljana, Prague 100 Central European Standard Time (GMT+01:00) Sarajevo, Skopje, Warsaw, Zagreb 105 Romance Standard Time (GMT+01:00) Brussels, Copenhagen, Madrid, Paris 110 W. Europe Standard Time (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna 113 W. Central Africa Standard Time (GMT+01:00) West Central Africa 115 E. Europe Standard Time (GMT+02:00) Bucharest 120 Egypt Standard Time (GMT+02:00) Cairo 125 FLE Standard Time (GMT+02:00) Helsinki, Kiev, Riga, Sofia, Tallinn, Vilnius 130 GTB Standard Time (GMT+02:00) Athens, Istanbul, Minsk 135 Israel Standard Time (GMT+02:00) Jerusalem 140 South Africa Standard Time (GMT+02:00) Harare, Pretoria 145 Russian Standard Time (GMT+03:00) Moscow, St. Petersburg, Volgograd 150 Arab Standard Time (GMT+03:00) Kuwait, Riyadh 155 E. Africa Standard Time (GMT+03:00) Nairobi 158 Arabic Standard Time (GMT+03:00) Baghdad 160 Iran Standard Time (GMT+03:30) Tehran 165 Arabian Standard Time (GMT+04:00) Abu Dhabi, Muscat 170 Caucasus Standard Time (GMT+04:00) Baku, Tbilisi, Yerevan 175 Transitional Islamic State of Afghanistan Standard Time (GMT+04:30) Kabul 180 Ekaterinburg Standard Time (GMT+05:00) Ekaterinburg 185 West Asia Standard Time (GMT+05:00) Islamabad, Karachi, Tashkent 190 India Standard Time (GMT+05:30) Chennai, Kolkata, Mumbai, New Delhi 193 Nepal Standard Time (GMT+05:45) Kathmandu 195 Central Asia Standard Time (GMT+06:00) Astana, Dhaka 200 Sri Lanka Standard Time (GMT+06:00) Sri Jayawardenepura 201 N. Central Asia Standard Time (GMT+06:00) Almaty, Novosibirsk 203 Myanmar Standard Time (GMT+06:30) Yangon (Rangoon) 205 S.E. Asia Standard Time (GMT+07:00) Bangkok, Hanoi, Jakarta 207 North Asia Standard Time (GMT+07:00) Krasnoyarsk 210 China Standard Time (GMT+08:00) Beijing, Chongqing, Hong Kong SAR, Urumqi 215 Singapore Standard Time (GMT+08:00) Kuala Lumpur, Singapore 220 Taipei Standard Time (GMT+08:00) Taipei 225 W. Australia Standard Time (GMT+08:00) Perth 227 North Asia East Standard Time (GMT+08:00) Irkutsk, Ulaanbaatar 230 Korea Standard Time (GMT+09:00) Seoul 235 Tokyo Standard Time (GMT+09:00) Osaka, Sapporo, Tokyo 240 Yakutsk Standard Time (GMT+09:00) Yakutsk 245 A.U.S. Central Standard Time (GMT+09:30) Darwin 250 Cen. Australia Standard Time (GMT+09:30) Adelaide 255 A.U.S. Eastern Standard Time (GMT+10:00) Canberra, Melbourne, Sydney 260 E. Australia Standard Time (GMT+10:00) Brisbane 265 Tasmania Standard Time (GMT+10:00) Hobart 270 Vladivostok Standard Time (GMT+10:00) Vladivostok 275 West Pacific Standard Time (GMT+10:00) Guam, Port Moresby 280 Central Pacific Standard Time (GMT+11:00) Magadan, Solomon Islands, New Caledonia 285 Fiji Islands Standard Time (GMT+12:00) Fiji Islands, Kamchatka, Marshall Islands 290 New Zealand Standard Time (GMT+12:00) Auckland, Wellington 300 Tonga Standard Time (GMT+13:00) Nuku'alofa