I did some looking around and could find nothing on the matter, I think a soulution to this COULD be to have a combo box with the different time zones then go from there by just updating there time from the server using DateAdd function. There maybe another way but this is what I figured out right now..
<select name="timezone">
<option value="-12" >(GMT -12:00 hours) Eniwetok, Kwajalein</option>
<option value="-11" >(GMT -11:00 hours) Midway Island, Samoa</option>
<option value="-10" >(GMT -10:00 hours) Hawaii</option>
<option value="-9" >(GMT -9:00 hours) Alaska</option>
<option value="-8" selected>(GMT -8:00 hours) Pacific Time (US & Canada)</option>
<option value="-7" >(GMT -7:00 hours) Mountain Time (US & Canada)</option>
<option value="-6" >(GMT -6:00 hours) Central Time (US & Canada), Mexico City</option>
<option value="-5" >(GMT -5:00 hours) Eastern Time (US & Canada), Bogota, Lima, Quito</option>
<option value="-4" >(GMT -4:00 hours) Atlantic Time (Canada), Caracas, La Paz</option>
<option value="-3.5" >(GMT -3:30 hours) Newfoundland</option>
<option value="-3" >(GMT -3:00 hours) Brazil, Buenos Aires, Georgetown</option>
<option value="-2" >(GMT -2:00 hours) Mid-Atlantic</option>
<option value="-1" >(GMT -1:00 hours) Azores, Cape Verde Islands</option>
<option value="0" >(GMT) Western Europe Time, London, Lisbon, Casablanca, Monrovia</option>
<option value="+1" >(GMT +1:00 hours) CET(Central Europe Time), Brussels, Copenhagen, Madrid, Paris</option>
<option value="+2" >(GMT +2:00 hours) EET(Eastern Europe Time), Kaliningrad, South Africa</option>
<option value="+3" >(GMT +3:00 hours) Baghdad, Kuwait, Riyadh, Moscow, St. Petersburg, Volgograd, Nairobi</option>
<option value="+3.5" >(GMT +3:30 hours) Tehran</option>
<option value="+4" >(GMT +4:00 hours) Abu Dhabi, Muscat, Baku, Tbilisi</option>
<option value="+4.5" >(GMT +4:30 hours) Kabul</option>
<option value="+5" >(GMT +5:00 hours) Ekaterinburg, Islamabad, Karachi, Tashkent</option>
<option value="+5.5" >(GMT +5:30 hours) Bombay, Calcutta, Madras, New Delhi</option>
<option value="+6" >(GMT +6:00 hours) Almaty, Dhaka, Colombo</option>
<option value="+7" >(GMT +7:00 hours) Bangkok, Hanoi, Jakarta</option>
<option value="+8" >(GMT +8:00 hours) Beijing, Perth, Singapore, Hong Kong, Chongqing, Urumqi, Taipei</option>
<option value="+9" >(GMT +9:00 hours) Tokyo, Seoul, Osaka, Sapporo, Yakutsk</option>
<option value="+9.5" >(GMT +9:30 hours) Adelaide, Darwin</option>
<option value="+10" >(GMT +10:00 hours) EAST(East Australian Standard), Guam, Papua New Guinea, Vladivostok</option>
<option value="+11" >(GMT +11:00 hours) Magadan, Solomon Islands, New Caledonia</option>
<option value="+12" >(GMT +12:00 hours) Auckland, Wellington, Fiji, Kamchatka, Marshall Island</option>
</select>