ActiveSupport2iOS_Timezones.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Information</key>
    <dict>
      <key>Description</key>
      <string>Map Rails ActiveSupport timezones to iOS readable timezone IDs.</string>
      <key>Version</key>
      <string>1.0</string>
    </dict>
    <key>TimeZones</key>
    <dict>
      <key>International Date Line West</key>
      <string>Pacific/Midway</string>
      <key>Midway Island</key>
      <string>Pacific/Midway</string>
      <key>American Samoa</key>
      <string>Pacific/Pago_Pago</string>
      <key>Hawaii</key>
      <string>Pacific/Honolulu</string>
      <key>Alaska</key>
      <string>America/Juneau</string>
      <key>Pacific Time (US &amp; Canada)</key>
      <string>America/Los_Angeles</string>
      <key>Tijuana</key>
      <string>America/Tijuana</string>
      <key>Mountain Time (US &amp; Canada)</key>
      <string>America/Denver</string>
      <key>Arizona</key>
      <string>America/Phoenix</string>
      <key>Chihuahua</key>
      <string>America/Chihuahua</string>
      <key>Mazatlan</key>
      <string>America/Mazatlan</string>
      <key>Central Time (US &amp; Canada)</key>
      <string>America/Chicago</string>
      <key>Saskatchewan</key>
      <string>America/Regina</string>
      <key>Guadalajara</key>
      <string>America/Mexico_City</string>
      <key>Mexico City</key>
      <string>America/Mexico_City</string>
      <key>Monterrey</key>
      <string>America/Monterrey</string>
      <key>Central America</key>
      <string>America/Guatemala</string>
      <key>Eastern Time (US &amp; Canada)</key>
      <string>America/New_York</string>
      <key>Indiana (East)</key>
      <string>America/Indiana/Indianapolis</string>
      <key>Bogota</key>
      <string>America/Bogota</string>
      <key>Lima</key>
      <string>America/Lima</string>
      <key>Quito</key>
      <string>America/Lima</string>
      <key>Atlantic Time (Canada)</key>
      <string>America/Halifax</string>
      <key>Caracas</key>
      <string>America/Caracas</string>
      <key>La Paz</key>
      <string>America/La_Paz</string>
      <key>Santiago</key>
      <string>America/Santiago</string>
      <key>Newfoundland</key>
      <string>America/St_Johns</string>
      <key>Brasilia</key>
      <string>America/Sao_Paulo</string>
      <key>Buenos Aires</key>
      <string>America/Argentina/Buenos_Aires</string>
      <key>Georgetown</key>
      <string>America/Guyana</string>
      <key>Greenland</key>
      <string>America/Godthab</string>
      <key>Mid-Atlantic</key>
      <string>Atlantic/South_Georgia</string>
      <key>Azores</key>
      <string>Atlantic/Azores</string>
      <key>Cape Verde Is.</key>
      <string>Atlantic/Cape_Verde</string>
      <key>Dublin</key>
      <string>Europe/Dublin</string>
      <key>Edinburgh</key>
      <string>Europe/London</string>
      <key>Lisbon</key>
      <string>Europe/Lisbon</string>
      <key>London</key>
      <string>Europe/London</string>
      <key>Casablanca</key>
      <string>Africa/Casablanca</string>
      <key>Monrovia</key>
      <string>Africa/Monrovia</string>
      <key>UTC</key>
      <string>Etc/UTC</string>
      <key>Belgrade</key>
      <string>Europe/Belgrade</string>
      <key>Bratislava</key>
      <string>Europe/Bratislava</string>
      <key>Budapest</key>
      <string>Europe/Budapest</string>
      <key>Ljubljana</key>
      <string>Europe/Ljubljana</string>
      <key>Prague</key>
      <string>Europe/Prague</string>
      <key>Sarajevo</key>
      <string>Europe/Sarajevo</string>
      <key>Skopje</key>
      <string>Europe/Skopje</string>
      <key>Warsaw</key>
      <string>Europe/Warsaw</string>
      <key>Zagreb</key>
      <string>Europe/Zagreb</string>
      <key>Brussels</key>
      <string>Europe/Brussels</string>
      <key>Copenhagen</key>
      <string>Europe/Copenhagen</string>
      <key>Madrid</key>
      <string>Europe/Madrid</string>
      <key>Paris</key>
      <string>Europe/Paris</string>
      <key>Amsterdam</key>
      <string>Europe/Amsterdam</string>
      <key>Berlin</key>
      <string>Europe/Berlin</string>
      <key>Bern</key>
      <string>Europe/Berlin</string>
      <key>Rome</key>
      <string>Europe/Rome</string>
      <key>Stockholm</key>
      <string>Europe/Stockholm</string>
      <key>Vienna</key>
      <string>Europe/Vienna</string>
      <key>West Central Africa</key>
      <string>Africa/Algiers</string>
      <key>Bucharest</key>
      <string>Europe/Bucharest</string>
      <key>Cairo</key>
      <string>Africa/Cairo</string>
      <key>Helsinki</key>
      <string>Europe/Helsinki</string>
      <key>Kyiv</key>
      <string>Europe/Kiev</string>
      <key>Riga</key>
      <string>Europe/Riga</string>
      <key>Sofia</key>
      <string>Europe/Sofia</string>
      <key>Tallinn</key>
      <string>Europe/Tallinn</string>
      <key>Vilnius</key>
      <string>Europe/Vilnius</string>
      <key>Athens</key>
      <string>Europe/Athens</string>
      <key>Istanbul</key>
      <string>Europe/Istanbul</string>
      <key>Minsk</key>
      <string>Europe/Minsk</string>
      <key>Jerusalem</key>
      <string>Asia/Jerusalem</string>
      <key>Harare</key>
      <string>Africa/Harare</string>
      <key>Pretoria</key>
      <string>Africa/Johannesburg</string>
      <key>Moscow</key>
      <string>Europe/Moscow</string>
      <key>St. Petersburg</key>
      <string>Europe/Moscow</string>
      <key>Volgograd</key>
      <string>Europe/Moscow</string>
      <key>Kuwait</key>
      <string>Asia/Kuwait</string>
      <key>Riyadh</key>
      <string>Asia/Riyadh</string>
      <key>Nairobi</key>
      <string>Africa/Nairobi</string>
      <key>Baghdad</key>
      <string>Asia/Baghdad</string>
      <key>Tehran</key>
      <string>Asia/Tehran</string>
      <key>Abu Dhabi</key>
      <string>Asia/Muscat</string>
      <key>Muscat</key>
      <string>Asia/Muscat</string>
      <key>Baku</key>
      <string>Asia/Baku</string>
      <key>Tbilisi</key>
      <string>Asia/Tbilisi</string>
      <key>Yerevan</key>
      <string>Asia/Yerevan</string>
      <key>Kabul</key>
      <string>Asia/Kabul</string>
      <key>Ekaterinburg</key>
      <string>Asia/Yekaterinburg</string>
      <key>Islamabad</key>
      <string>Asia/Karachi</string>
      <key>Karachi</key>
      <string>Asia/Karachi</string>
      <key>Tashkent</key>
      <string>Asia/Tashkent</string>
      <key>Chennai</key>
      <string>Asia/Kolkata</string>
      <key>Kolkata</key>
      <string>Asia/Kolkata</string>
      <key>Mumbai</key>
      <string>Asia/Kolkata</string>
      <key>New Delhi</key>
      <string>Asia/Kolkata</string>
      <key>Kathmandu</key>
      <string>Asia/Kathmandu</string>
      <key>Astana</key>
      <string>Asia/Dhaka</string>
      <key>Dhaka</key>
      <string>Asia/Dhaka</string>
      <key>Sri Jayawardenepura</key>
      <string>Asia/Colombo</string>
      <key>Almaty</key>
      <string>Asia/Almaty</string>
      <key>Novosibirsk</key>
      <string>Asia/Novosibirsk</string>
      <key>Rangoon</key>
      <string>Asia/Rangoon</string>
      <key>Bangkok</key>
      <string>Asia/Bangkok</string>
      <key>Hanoi</key>
      <string>Asia/Bangkok</string>
      <key>Jakarta</key>
      <string>Asia/Jakarta</string>
      <key>Krasnoyarsk</key>
      <string>Asia/Krasnoyarsk</string>
      <key>Beijing</key>
      <string>Asia/Shanghai</string>
      <key>Chongqing</key>
      <string>Asia/Chongqing</string>
      <key>Hong Kong</key>
      <string>Asia/Hong_Kong</string>
      <key>Urumqi</key>
      <string>Asia/Urumqi</string>
      <key>Kuala Lumpur</key>
      <string>Asia/Kuala_Lumpur</string>
      <key>Singapore</key>
      <string>Asia/Singapore</string>
      <key>Taipei</key>
      <string>Asia/Taipei</string>
      <key>Perth</key>
      <string>Australia/Perth</string>
      <key>Irkutsk</key>
      <string>Asia/Irkutsk</string>
      <key>Ulaan Bataar</key>
      <string>Asia/Ulaanbaatar</string>
      <key>Seoul</key>
      <string>Asia/Seoul</string>
      <key>Osaka</key>
      <string>Asia/Tokyo</string>
      <key>Sapporo</key>
      <string>Asia/Tokyo</string>
      <key>Tokyo</key>
      <string>Asia/Tokyo</string>
      <key>Yakutsk</key>
      <string>Asia/Yakutsk</string>
      <key>Darwin</key>
      <string>Australia/Darwin</string>
      <key>Adelaide</key>
      <string>Australia/Adelaide</string>
      <key>Canberra</key>
      <string>Australia/Melbourne</string>
      <key>Melbourne</key>
      <string>Australia/Melbourne</string>
      <key>Sydney</key>
      <string>Australia/Sydney</string>
      <key>Brisbane</key>
      <string>Australia/Brisbane</string>
      <key>Hobart</key>
      <string>Australia/Hobart</string>
      <key>Vladivostok</key>
      <string>Asia/Vladivostok</string>
      <key>Guam</key>
      <string>Pacific/Guam</string>
      <key>Port Moresby</key>
      <string>Pacific/Port_Moresby</string>
      <key>Magadan</key>
      <string>Asia/Magadan</string>
      <key>Solomon Is.</key>
      <string>Asia/Magadan</string>
      <key>New Caledonia</key>
      <string>Pacific/Noumea</string>
      <key>Fiji</key>
      <string>Pacific/Fiji</string>
      <key>Kamchatka</key>
      <string>Asia/Kamchatka</string>
      <key>Marshall Is.</key>
      <string>Pacific/Majuro</string>
      <key>Auckland</key>
      <string>Pacific/Auckland</string>
      <key>Wellington</key>
      <string>Pacific/Auckland</string>
      <key>Nuku'alofa</key>
      <string>Pacific/Tongatapu</string>
      <key>Tokelau Is.</key>
      <string>Pacific/Fakaofo</string>
      <key>Samoa</key>
      <string>Pacific/Apia</string>
    </dict>
  </dict>
</plist>

gistfile1.m

// Save the above plist somewhere in your project. Then use it like this:
 
NSString *activeRecordTimeZoneName = @"American Samoa";
NSDictionary *timeZoneMap = [[NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"ActiveRecord2iOS_Timezones" ofType:@"plist"]] objectForKey:@"TimeZones"];
return [NSTimeZone timeZoneWithName:[timeZoneMap valueForKey:activeRecordTimeZoneName]];

All of these still work except for "Ulaan Bataar" which is now "Ulaanbaatar" in rails.

Nice Work.Thanks

Swift Implementation:

let activeRecordTimeZoneName = "American Samoa"
let path = Bundle.main.path(forResource: "ActiveSupport2iOS_Timezones", ofType: "plist")!
let timeZoneMap: NSDictionary = NSDictionary(contentsOfFile: path)!["TimeZones"]
return timeZoneMap[activeRecordTimeZoneName]