Created
January 5, 2011 21:44
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Maps tz database time zone identifiers to Rails time zone identifiers
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# blog post: http://blog.slashpoundbang.com/post/2613268281/changing-from-tz-database-identifiers-to-rails-friendly | |
{ | |
"Australia/Adelaide" => "Adelaide", | |
"Australia/Broken_Hill" => "Adelaide", | |
"America/Anchorage" => "Alaska", | |
"America/Juneau" => "Alaska", | |
"America/Nome" => "Alaska", | |
"America/Yakutat" => "Alaska", | |
"Pacific/Gambier" => "Alaska", | |
"Asia/Almaty" => "Almaty", | |
"Europe/Amsterdam" => "Amsterdam", | |
"Europe/Athens" => "Athens", | |
"America/Anguilla" => "Atlantic Time (Canada)", | |
"America/Antigua" => "Atlantic Time (Canada)", | |
"America/Argentina/San_Luis" => "Atlantic Time (Canada)", | |
"America/Aruba" => "Atlantic Time (Canada)", | |
"America/Asuncion" => "Atlantic Time (Canada)", | |
"America/Barbados" => "Atlantic Time (Canada)", | |
"America/Blanc-Sablon" => "Atlantic Time (Canada)", | |
"America/Boa_Vista" => "Atlantic Time (Canada)", | |
"America/Campo_Grande" => "Atlantic Time (Canada)", | |
"America/Cuiaba" => "Atlantic Time (Canada)", | |
"America/Curacao" => "Atlantic Time (Canada)", | |
"America/Dominica" => "Atlantic Time (Canada)", | |
"America/Eirunepe" => "Atlantic Time (Canada)", | |
"America/Glace_Bay" => "Atlantic Time (Canada)", | |
"America/Goose_Bay" => "Atlantic Time (Canada)", | |
"America/Grenada" => "Atlantic Time (Canada)", | |
"America/Guadeloupe" => "Atlantic Time (Canada)", | |
"America/Guyana" => "Atlantic Time (Canada)", | |
"America/Halifax" => "Atlantic Time (Canada)", | |
"America/Manaus" => "Atlantic Time (Canada)", | |
"America/Marigot" => "Atlantic Time (Canada)", | |
"America/Martinique" => "Atlantic Time (Canada)", | |
"America/Moncton" => "Atlantic Time (Canada)", | |
"America/Montserrat" => "Atlantic Time (Canada)", | |
"America/Porto_Velho" => "Atlantic Time (Canada)", | |
"America/Port_of_Spain" => "Atlantic Time (Canada)", | |
"America/Puerto_Rico" => "Atlantic Time (Canada)", | |
"America/Rio_Branco" => "Atlantic Time (Canada)", | |
"America/Santo_Domingo" => "Atlantic Time (Canada)", | |
"America/St_Barthelemy" => "Atlantic Time (Canada)", | |
"America/St_Kitts" => "Atlantic Time (Canada)", | |
"America/St_Lucia" => "Atlantic Time (Canada)", | |
"America/St_Thomas" => "Atlantic Time (Canada)", | |
"America/St_Vincent" => "Atlantic Time (Canada)", | |
"America/Thule" => "Atlantic Time (Canada)", | |
"America/Tortola" => "Atlantic Time (Canada)", | |
"Antarctica/Palmer" => "Atlantic Time (Canada)", | |
"Atlantic/Bermuda" => "Atlantic Time (Canada)", | |
"Atlantic/Stanley" => "Atlantic Time (Canada)", | |
"Antarctica/McMurdo" => "Auckland", | |
"Antarctica/South_Pole" => "Auckland", | |
"Pacific/Auckland" => "Auckland", | |
"Pacific/Funafuti" => "Auckland", | |
"Pacific/Kwajalein" => "Auckland", | |
"Pacific/Majuro" => "Auckland", | |
"Pacific/Nauru" => "Auckland", | |
"Pacific/Tarawa" => "Auckland", | |
"Pacific/Wake" => "Auckland", | |
"Pacific/Wallis" => "Auckland", | |
"Atlantic/Azores" => "Azores", | |
"Asia/Baghdad" => "Baghdad", | |
"Asia/Baku" => "Baku", | |
"Asia/Dubai" => "Baku", | |
"Indian/Mahe" => "Baku", | |
"Indian/Mauritius" => "Baku", | |
"Indian/Reunion" => "Baku", | |
"Asia/Bangkok" => "Bangkok", | |
"Europe/Belgrade" => "Belgrade", | |
"Europe/Berlin" => "Berlin", | |
"America/Bogota" => "Bogota", | |
"Europe/Bratislava" => "Bratislava", | |
"Australia/Brisbane" => "Brisbane", | |
"Europe/Brussels" => "Brussels", | |
"Europe/Bucharest" => "Bucharest", | |
"Europe/Budapest" => "Budapest", | |
"America/Araguaina" => "Buenos Aires", | |
"America/Argentina/Buenos_Aires" => "Buenos Aires", | |
"America/Argentina/Catamarca" => "Buenos Aires", | |
"America/Argentina/Cordoba" => "Buenos Aires", | |
"America/Argentina/Jujuy" => "Buenos Aires", | |
"America/Argentina/La_Rioja" => "Buenos Aires", | |
"America/Argentina/Mendoza" => "Buenos Aires", | |
"America/Argentina/Rio_Gallegos" => "Buenos Aires", | |
"America/Argentina/Salta" => "Buenos Aires", | |
"America/Argentina/San_Juan" => "Buenos Aires", | |
"America/Argentina/Tucuman" => "Buenos Aires", | |
"America/Argentina/Ushuaia" => "Buenos Aires", | |
"America/Bahia" => "Buenos Aires", | |
"America/Belem" => "Buenos Aires", | |
"America/Cayenne" => "Buenos Aires", | |
"America/Fortaleza" => "Buenos Aires", | |
"America/Godthab" => "Buenos Aires", | |
"America/Maceio" => "Buenos Aires", | |
"America/Miquelon" => "Buenos Aires", | |
"America/Montevideo" => "Buenos Aires", | |
"America/Paramaribo" => "Buenos Aires", | |
"America/Recife" => "Buenos Aires", | |
"America/Santarem" => "Buenos Aires", | |
"America/Sao_Paulo" => "Buenos Aires", | |
"Antarctica/Rothera" => "Buenos Aires", | |
"Africa/Blantyre" => "Cairo", | |
"Africa/Bujumbura" => "Cairo", | |
"Africa/Cairo" => "Cairo", | |
"Africa/Gaborone" => "Cairo", | |
"Africa/Johannesburg" => "Cairo", | |
"Africa/Kigali" => "Cairo", | |
"Africa/Lubumbashi" => "Cairo", | |
"Africa/Lusaka" => "Cairo", | |
"Africa/Maputo" => "Cairo", | |
"Africa/Maseru" => "Cairo", | |
"Africa/Mbabane" => "Cairo", | |
"Africa/Tripoli" => "Cairo", | |
"Asia/Amman" => "Cairo", | |
"Asia/Beirut" => "Cairo", | |
"Asia/Damascus" => "Cairo", | |
"Asia/Gaza" => "Cairo", | |
"Asia/Nicosia" => "Cairo", | |
"Europe/Chisinau" => "Cairo", | |
"Europe/Kaliningrad" => "Cairo", | |
"Europe/Kiev" => "Cairo", | |
"Europe/Mariehamn" => "Cairo", | |
"Europe/Simferopol" => "Cairo", | |
"Europe/Uzhgorod" => "Cairo", | |
"Europe/Zaporozhye" => "Cairo", | |
"America/Scoresbysund" => "Cape Verde Is.", | |
"Atlantic/Cape_Verde" => "Cape Verde Is.", | |
"America/Caracas" => "Caracas", | |
"Africa/Casablanca" => "Casablanca", | |
"America/Belize" => "Central Time (US & Canada)", | |
"America/Cancun" => "Central Time (US & Canada)", | |
"America/Chicago" => "Central Time (US & Canada)", | |
"America/Costa_Rica" => "Central Time (US & Canada)", | |
"America/El_Salvador" => "Central Time (US & Canada)", | |
"America/Guatemala" => "Central Time (US & Canada)", | |
"America/Indiana/Knox" => "Central Time (US & Canada)", | |
"America/Indiana/Tell_City" => "Central Time (US & Canada)", | |
"America/Managua" => "Central Time (US & Canada)", | |
"America/Matamoros" => "Central Time (US & Canada)", | |
"America/Menominee" => "Central Time (US & Canada)", | |
"America/Merida" => "Central Time (US & Canada)", | |
"America/North_Dakota/Center" => "Central Time (US & Canada)", | |
"America/North_Dakota/New_Salem" => "Central Time (US & Canada)", | |
"America/Rainy_River" => "Central Time (US & Canada)", | |
"America/Rankin_Inlet" => "Central Time (US & Canada)", | |
"America/Regina" => "Central Time (US & Canada)", | |
"America/Swift_Current" => "Central Time (US & Canada)", | |
"America/Tegucigalpa" => "Central Time (US & Canada)", | |
"America/Winnipeg" => "Central Time (US & Canada)", | |
"Pacific/Easter" => "Central Time (US & Canada)", | |
"Pacific/Galapagos" => "Central Time (US & Canada)", | |
"America/Chihuahua" => "Chihuahua", | |
"Asia/Chongqing" => "Chongqing", | |
"Europe/Copenhagen" => "Copenhagen", | |
"Australia/Darwin" => "Darwin", | |
"Antarctica/Mawson" => "Dhaka", | |
"Asia/Bishkek" => "Dhaka", | |
"Asia/Dhaka" => "Dhaka", | |
"Asia/Karachi" => "Dhaka", | |
"Asia/Novokuznetsk" => "Dhaka", | |
"Asia/Omsk" => "Dhaka", | |
"Asia/Qyzylorda" => "Dhaka", | |
"Asia/Thimphu" => "Dhaka", | |
"Indian/Chagos" => "Dhaka", | |
"Europe/Dublin" => "Dublin", | |
"America/Atikokan" => "Eastern Time (US & Canada)", | |
"America/Cayman" => "Eastern Time (US & Canada)", | |
"America/Detroit" => "Eastern Time (US & Canada)", | |
"America/Grand_Turk" => "Eastern Time (US & Canada)", | |
"America/Guayaquil" => "Eastern Time (US & Canada)", | |
"America/Havana" => "Eastern Time (US & Canada)", | |
"America/Indiana/Indianapolis" => "Eastern Time (US & Canada)", | |
"America/Indiana/Marengo" => "Eastern Time (US & Canada)", | |
"America/Indiana/Petersburg" => "Eastern Time (US & Canada)", | |
"America/Indiana/Vevay" => "Eastern Time (US & Canada)", | |
"America/Indiana/Vincennes" => "Eastern Time (US & Canada)", | |
"America/Indiana/Winamac" => "Eastern Time (US & Canada)", | |
"America/Iqaluit" => "Eastern Time (US & Canada)", | |
"America/Jamaica" => "Eastern Time (US & Canada)", | |
"America/Kentucky/Louisville" => "Eastern Time (US & Canada)", | |
"America/Kentucky/Monticello" => "Eastern Time (US & Canada)", | |
"America/Montreal" => "Eastern Time (US & Canada)", | |
"America/Nassau" => "Eastern Time (US & Canada)", | |
"America/New_York" => "Eastern Time (US & Canada)", | |
"America/Nipigon" => "Eastern Time (US & Canada)", | |
"America/Panama" => "Eastern Time (US & Canada)", | |
"America/Pangnirtung" => "Eastern Time (US & Canada)", | |
"America/Port-au-Prince" => "Eastern Time (US & Canada)", | |
"America/Resolute" => "Eastern Time (US & Canada)", | |
"America/Thunder_Bay" => "Eastern Time (US & Canada)", | |
"America/Toronto" => "Eastern Time (US & Canada)", | |
"Pacific/Fiji" => "Fiji", | |
"Pacific/Guam" => "Guam", | |
"Africa/Harare" => "Harare", | |
"America/Adak" => "Hawaii", | |
"Pacific/Fakaofo" => "Hawaii", | |
"Pacific/Honolulu" => "Hawaii", | |
"Pacific/Johnston" => "Hawaii", | |
"Pacific/Rarotonga" => "Hawaii", | |
"Pacific/Tahiti" => "Hawaii", | |
"Europe/Helsinki" => "Helsinki", | |
"Australia/Hobart" => "Hobart", | |
"Antarctica/Casey" => "Hong Kong", | |
"Asia/Brunei" => "Hong Kong", | |
"Asia/Choibalsan" => "Hong Kong", | |
"Asia/Harbin" => "Hong Kong", | |
"Asia/Hong_Kong" => "Hong Kong", | |
"Asia/Kashgar" => "Hong Kong", | |
"Asia/Kuching" => "Hong Kong", | |
"Asia/Macau" => "Hong Kong", | |
"Asia/Makassar" => "Hong Kong", | |
"Asia/Manila" => "Hong Kong", | |
"Asia/Shanghai" => "Hong Kong", | |
"Asia/Ulaanbaatar" => "Hong Kong", | |
"Asia/Irkutsk" => "Irkutsk", | |
"Europe/Istanbul" => "Istanbul", | |
"Antarctica/Davis" => "Jakarta", | |
"Asia/Hovd" => "Jakarta", | |
"Asia/Ho_Chi_Minh" => "Jakarta", | |
"Asia/Jakarta" => "Jakarta", | |
"Asia/Phnom_Penh" => "Jakarta", | |
"Asia/Pontianak" => "Jakarta", | |
"Asia/Vientiane" => "Jakarta", | |
"Indian/Christmas" => "Jakarta", | |
"Asia/Jerusalem" => "Jerusalem", | |
"Asia/Kabul" => "Kabul", | |
"Asia/Kamchatka" => "Kamchatka", | |
"Asia/Aqtau" => "Karachi", | |
"Asia/Aqtobe" => "Karachi", | |
"Asia/Ashgabat" => "Karachi", | |
"Asia/Dushanbe" => "Karachi", | |
"Asia/Oral" => "Karachi", | |
"Asia/Samarkand" => "Karachi", | |
"Asia/Yekaterinburg" => "Karachi", | |
"Indian/Kerguelen" => "Karachi", | |
"Indian/Maldives" => "Karachi", | |
"Asia/Kathmandu" => "Kathmandu", | |
"Asia/Kolkata" => "Kolkata", | |
"Asia/Krasnoyarsk" => "Krasnoyarsk", | |
"Asia/Kuala_Lumpur" => "Kuala Lumpur", | |
"Asia/Kuwait" => "Kuwait", | |
"America/La_Paz" => "La Paz", | |
"America/Lima" => "Lima", | |
"Europe/Lisbon" => "Lisbon", | |
"Europe/Ljubljana" => "Ljubljana", | |
"Africa/Abidjan" => "London", | |
"Africa/Accra" => "London", | |
"Africa/Bamako" => "London", | |
"Africa/Banjul" => "London", | |
"Africa/Bissau" => "London", | |
"Africa/Conakry" => "London", | |
"Africa/Dakar" => "London", | |
"Africa/El_Aaiun" => "London", | |
"Africa/Freetown" => "London", | |
"Africa/Lome" => "London", | |
"Africa/Nouakchott" => "London", | |
"Africa/Ouagadougou" => "London", | |
"Africa/Sao_Tome" => "London", | |
"America/Danmarkshavn" => "London", | |
"Antarctica/Vostok" => "London", | |
"Atlantic/Canary" => "London", | |
"Atlantic/Faroe" => "London", | |
"Atlantic/Madeira" => "London", | |
"Atlantic/Reykjavik" => "London", | |
"Atlantic/St_Helena" => "London", | |
"Europe/Guernsey" => "London", | |
"Europe/Isle_of_Man" => "London", | |
"Europe/Jersey" => "London", | |
"Europe/London" => "London", | |
"Europe/Madrid" => "Madrid", | |
"Asia/Magadan" => "Magadan", | |
"America/Mazatlan" => "Mazatlan", | |
"Australia/Melbourne" => "Melbourne", | |
"America/Mexico_City" => "Mexico City", | |
"America/Noronha" => "Mid-Atlantic", | |
"Atlantic/South_Georgia" => "Mid-Atlantic", | |
"Europe/Minsk" => "Minsk", | |
"Africa/Monrovia" => "Monrovia", | |
"America/Monterrey" => "Monterrey", | |
"Africa/Addis_Ababa" => "Moscow", | |
"Africa/Asmara" => "Moscow", | |
"Africa/Dar_es_Salaam" => "Moscow", | |
"Africa/Djibouti" => "Moscow", | |
"Africa/Kampala" => "Moscow", | |
"Africa/Khartoum" => "Moscow", | |
"Africa/Mogadishu" => "Moscow", | |
"Antarctica/Syowa" => "Moscow", | |
"Asia/Aden" => "Moscow", | |
"Asia/Bahrain" => "Moscow", | |
"Asia/Qatar" => "Moscow", | |
"Europe/Moscow" => "Moscow", | |
"Europe/Samara" => "Moscow", | |
"Indian/Antananarivo" => "Moscow", | |
"Indian/Comoro" => "Moscow", | |
"Indian/Mayotte" => "Moscow", | |
"America/Boise" => "Mountain Time (US & Canada)", | |
"America/Cambridge_Bay" => "Mountain Time (US & Canada)", | |
"America/Dawson_Creek" => "Mountain Time (US & Canada)", | |
"America/Denver" => "Mountain Time (US & Canada)", | |
"America/Edmonton" => "Mountain Time (US & Canada)", | |
"America/Hermosillo" => "Mountain Time (US & Canada)", | |
"America/Inuvik" => "Mountain Time (US & Canada)", | |
"America/Ojinaga" => "Mountain Time (US & Canada)", | |
"America/Phoenix" => "Mountain Time (US & Canada)", | |
"America/Shiprock" => "Mountain Time (US & Canada)", | |
"America/Yellowknife" => "Mountain Time (US & Canada)", | |
"Asia/Colombo" => "Mumbai", | |
"Asia/Muscat" => "Muscat", | |
"Africa/Nairobi" => "Nairobi", | |
"America/St_Johns" => "Newfoundland", | |
"Asia/Novosibirsk" => "Novosibirsk", | |
"Pacific/Enderbury" => "Nuku'alofa", | |
"Pacific/Tongatapu" => "Nuku'alofa", | |
"America/Dawson" => "Pacific Time (US & Canada)", | |
"America/Los_Angeles" => "Pacific Time (US & Canada)", | |
"America/Santa_Isabel" => "Pacific Time (US & Canada)", | |
"America/Vancouver" => "Pacific Time (US & Canada)", | |
"America/Whitehorse" => "Pacific Time (US & Canada)", | |
"Pacific/Pitcairn" => "Pacific Time (US & Canada)", | |
"Africa/Algiers" => "Paris", | |
"Africa/Bangui" => "Paris", | |
"Africa/Brazzaville" => "Paris", | |
"Africa/Ceuta" => "Paris", | |
"Africa/Douala" => "Paris", | |
"Africa/Kinshasa" => "Paris", | |
"Africa/Lagos" => "Paris", | |
"Africa/Libreville" => "Paris", | |
"Africa/Luanda" => "Paris", | |
"Africa/Malabo" => "Paris", | |
"Africa/Ndjamena" => "Paris", | |
"Africa/Niamey" => "Paris", | |
"Africa/Porto-Novo" => "Paris", | |
"Africa/Tunis" => "Paris", | |
"Africa/Windhoek" => "Paris", | |
"Arctic/Longyearbyen" => "Paris", | |
"Europe/Andorra" => "Paris", | |
"Europe/Gibraltar" => "Paris", | |
"Europe/Luxembourg" => "Paris", | |
"Europe/Malta" => "Paris", | |
"Europe/Monaco" => "Paris", | |
"Europe/Oslo" => "Paris", | |
"Europe/Paris" => "Paris", | |
"Europe/Podgorica" => "Paris", | |
"Europe/San_Marino" => "Paris", | |
"Europe/Tirane" => "Paris", | |
"Europe/Vaduz" => "Paris", | |
"Europe/Vatican" => "Paris", | |
"Europe/Zurich" => "Paris", | |
"Australia/Perth" => "Perth", | |
"Pacific/Port_Moresby" => "Port Moresby", | |
"Europe/Prague" => "Prague", | |
"Asia/Rangoon" => "Rangoon", | |
"Indian/Cocos" => "Rangoon", | |
"Europe/Riga" => "Riga", | |
"Asia/Riyadh" => "Riyadh", | |
"Europe/Rome" => "Rome", | |
"Pacific/Apia" => "Samoa", | |
"Pacific/Midway" => "Samoa", | |
"Pacific/Niue" => "Samoa", | |
"Pacific/Pago_Pago" => "Samoa", | |
"America/Santiago" => "Santiago", | |
"Europe/Sarajevo" => "Sarajevo", | |
"Asia/Seoul" => "Seoul", | |
"Asia/Singapore" => "Singapore", | |
"Europe/Skopje" => "Skopje", | |
"Europe/Sofia" => "Sofia", | |
"Asia/Anadyr" => "Solomon Is.", | |
"Pacific/Efate" => "Solomon Is.", | |
"Pacific/Guadalcanal" => "Solomon Is.", | |
"Pacific/Kosrae" => "Solomon Is.", | |
"Pacific/Noumea" => "Solomon Is.", | |
"Pacific/Ponape" => "Solomon Is.", | |
"Europe/Stockholm" => "Stockholm", | |
"Antarctica/DumontDUrville" => "Sydney", | |
"Asia/Sakhalin" => "Sydney", | |
"Australia/Currie" => "Sydney", | |
"Australia/Lindeman" => "Sydney", | |
"Australia/Sydney" => "Sydney", | |
"Pacific/Saipan" => "Sydney", | |
"Pacific/Truk" => "Sydney", | |
"Asia/Taipei" => "Taipei", | |
"Europe/Tallinn" => "Tallinn", | |
"Asia/Tashkent" => "Tashkent", | |
"Asia/Tbilisi" => "Tbilisi", | |
"Asia/Tehran" => "Tehran", | |
"America/Tijuana" => "Tijuana", | |
"Asia/Dili" => "Tokyo", | |
"Asia/Jayapura" => "Tokyo", | |
"Asia/Pyongyang" => "Tokyo", | |
"Asia/Tokyo" => "Tokyo", | |
"Pacific/Palau" => "Tokyo", | |
"Asia/Urumqi" => "Urumqi", | |
"Europe/Vienna" => "Vienna", | |
"Europe/Vilnius" => "Vilnius", | |
"Asia/Vladivostok" => "Vladivostok", | |
"Europe/Volgograd" => "Volgograd", | |
"Europe/Warsaw" => "Warsaw", | |
"Asia/Yakutsk" => "Yakutsk", | |
"Asia/Yerevan" => "Yerevan", | |
"Europe/Zagreb" => "Zagreb", | |
} |
These are the Rails time zone names missing other than "Arizona":
>> (ActiveSupport::TimeZone::MAPPING.keys - the_hash.values.uniq).sort
=> ["Abu Dhabi", "American Samoa", "Arizona", "Astana", "Beijing", "Bern", "Brasilia", "Canberra", "Central America", "Chatham Is.", "Chennai", "Edinburgh", "Ekaterinburg", "Georgetown", "Greenland", "Guadalajara", "Hanoi", "Indiana (East)", "International Date Line West", "Islamabad", "Kaliningrad", "Kyiv", "Marshall Is.", "Midway Island", "Montevideo", "New Caledonia", "New Delhi", "Osaka", "Pretoria", "Puerto Rico", "Quito", "Samara", "Sapporo", "Saskatchewan", "Srednekolymsk", "Sri Jayawardenepura", "St. Petersburg", "Tokelau Is.", "UTC", "Ulaanbaatar", "Wellington", "Zurich"]
And these are the IANA time zone names (long names like "Europe/Stockholm") that Rails supports in its mapping but that this hash does not include:
>> (ActiveSupport::TimeZone::MAPPING.values - the_hash.keys.uniq).sort
=> ["Asia/Srednekolymsk", "Etc/GMT+12", "Etc/UTC", "Pacific/Chatham"]
So if you want to convert from IANA time zone names to Rails time zone names, I guess the best thing (until someone revisits the hash) is to combine them:
key = "Australia/Broken_Hill"
ActiveSupport::TimeZone::MAPPING.invert[key] || the_hash[key]
# => "Adelaide"
The actual mappings used by Ruby are here: https://github.com/rails/rails/blob/master/activesupport/lib/active_support/values/time_zone.rb
They include the above missing parts
Edit: for reverse mappings, I found a more comprehensive list here: https://gist.github.com/stevelacey/0c8656a0129b415843b0
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It looks like this list doesn't properly account for daylight savings. I'll give an example:
The Rails time zone "Central Time (US & Canada)" is −6 (Central Standard Time) but in the summer months it observes daylight savings and becomes −5 (Central Daylight Time).
Contrast this this with the Rails time zone "Central America," which is −6 all year round.
Now take a look at the tz database zone "America/Belize." This zone is also −6 all year round. So it shouldn't map to the Rails zone "Central Time (US & Canada)" but rather to "Central America."
You can check this yourself in IRB: