<select>
<option value="Africa/Algiers">Africa/Algiers</option>
<option value="Africa/Cairo">Africa/Cairo</option>
<option value="Africa/Casablanca">Africa/Casablanca</option>
<option value="Africa/Harare">Africa/Harare</option>
<option value="Africa/Nairobi">Africa/Nairobi</option>
<option value="America/Argentina/Buenos_Aires">America/Argentina/Buenos_Aires</option>
<option value="America/Belize">America/Belize</option>
<option value="America/Bogota">America/Bogota</option>
<option value="America/Boise">America/Boise</option>
<option value="America/Caracas">America/Caracas</option>
<option value="America/Chicago">America/Chicago</option>
<option value="America/Chihuahua">America/Chihuahua</option>
<option value="America/Dawson">America/Dawson</option>
<option value="America/Detroit">America/Detroit</option>
<option value="America/Glace_Bay">America/Glace_Bay</option>
<option value="America/Godthab">America/Godthab</option>
<option value="America/Indiana/Indianapolis">America/Indiana/Indianapolis</option>
<option value="America/Juneau">America/Juneau</option>
<option value="America/Mexico_City">America/Mexico_City</option>
<option value="America/Phoenix">America/Phoenix</option>
<option value="America/Regina">America/Regina</option>
<option value="America/Santiago">America/Santiago</option>
<option value="America/Sao_Paulo">America/Sao_Paulo</option>
<option value="America/St_Johns">America/St_Johns</option>
<option value="Asia/Almaty">Asia/Almaty</option>
<option value="Asia/Baghdad">Asia/Baghdad</option>
<option value="Asia/Baku">Asia/Baku</option>
<option value="Asia/Bangkok">Asia/Bangkok</option>
<option value="Asia/Colombo">Asia/Colombo</option>
<option value="Asia/Dhaka">Asia/Dhaka</option>
<option value="Asia/Dubai">Asia/Dubai</option>
<option value="Asia/Irkutsk">Asia/Irkutsk</option>
<option value="Asia/Jerusalem">Asia/Jerusalem</option>
<option value="Asia/Kabul">Asia/Kabul</option>
<option value="Asia/Karachi">Asia/Karachi</option>
<option value="Asia/Kathmandu">Asia/Kathmandu</option>
<option value="Asia/Kolkata">Asia/Kolkata</option>
<option value="Asia/Krasnoyarsk">Asia/Krasnoyarsk</option>
<option value="Asia/Kuala_Lumpur">Asia/Kuala_Lumpur</option>
<option value="Asia/Kuwait">Asia/Kuwait</option>
<option value="Asia/Magadan">Asia/Magadan</option>
<option value="Asia/Rangoon">Asia/Rangoon</option>
<option value="Asia/Seoul">Asia/Seoul</option>
<option value="Asia/Shanghai">Asia/Shanghai</option>
<option value="Asia/Taipei">Asia/Taipei</option>
<option value="Asia/Tehran">Asia/Tehran</option>
<option value="Asia/Tokyo">Asia/Tokyo</option>
<option value="Asia/Vladivostok">Asia/Vladivostok</option>
<option value="Asia/Yakutsk">Asia/Yakutsk</option>
<option value="Asia/Yekaterinburg">Asia/Yekaterinburg</option>
<option value="Atlantic/Azores">Atlantic/Azores</option>
<option value="Atlantic/Canary">Atlantic/Canary</option>
<option value="Atlantic/Cape_Verde">Atlantic/Cape_Verde</option>
<option value="Australia/Adelaide">Australia/Adelaide</option>
<option value="Australia/Brisbane">Australia/Brisbane</option>
<option value="Australia/Darwin">Australia/Darwin</option>
<option value="Australia/Hobart">Australia/Hobart</option>
<option value="Australia/Perth">Australia/Perth</option>
<option value="Australia/Sydney">Australia/Sydney</option>
<option value="Etc/GMT+2">Etc/GMT+2</option>
<option value="Europe/Amsterdam">Europe/Amsterdam</option>
<option value="Europe/Athens">Europe/Athens</option>
<option value="Europe/Belgrade">Europe/Belgrade</option>
<option value="Europe/Brussels">Europe/Brussels</option>
<option value="Europe/Bucharest">Europe/Bucharest</option>
<option value="Europe/Helsinki">Europe/Helsinki</option>
<option value="Europe/Moscow">Europe/Moscow</option>
<option value="Europe/Sarajevo">Europe/Sarajevo</option>
<option value="GMT">GMT</option>
<option value="Pacific/Auckland">Pacific/Auckland</option>
<option value="Pacific/Fiji">Pacific/Fiji</option>
<option value="Pacific/Guam">Pacific/Guam</option>
<option value="Pacific/Honolulu">Pacific/Honolulu</option>
<option value="Pacific/Midway">Pacific/Midway</option>
"Pacific/Tongatapu"
<option value="Etc/GMT+12">Etc/GMT+12</option>
</select>