Changes from UTC offset to time zone identifier in Rails

utc_offset_to_friendly_identifier.rb

# blog post: http://blog.slashpoundbang.com/post/2605632137/changing-from-utc-offset-to-time-zone-identifier-in

identifier = {
  -11  => 'Samoa',#International Date Line West, Midway Island
  -10  => 'Hawaii',
  -9   => 'Alaska',
  -8   => 'Pacific Time (US & Canada)',#Tijuana
  -7   => 'Mountain Time (US & Canada)',#Arizona, Chihuahua, Mazatlan
  -6   => 'Central Time (US & Canada)',#Central America, Guadalajara, Mexico City, Monterrey, Saskatchewan
  -5   => 'Eastern Time (US & Canada)',#Bogota, Indiana (East), Lima, Quito
  -4.5 => 'Caracas',
  -4   => 'Atlantic Time (Canada)',#Georgetown, La Paz, Santiago
  -3.5 => 'Newfoundland',
  -3   => 'Buenos Aires',#Brasilia, Greenland
  -2   => 'Mid-Atlantic',
  -1   => 'Cape Verde Is.',#Azores
  0    => 'London',#Casablanca, Dublin, Edinburgh, Lisbon, Monrovia, UTC
  1    => 'Paris',#Amsterdam, Belgrade, Berlin, Bern, Bratislava, Brussels, Budapest, Copenhagen, Ljubljana, Madrid, Prague, Rome, Sarajevo, Skopje, Stockholm, Vienna, Warsaw, West Central Africa, Zagreb
  2    => 'Cairo',#Athens, Bucharest, Harare, Helsinki, Istanbul, Jerusalem, Kyiv, Minsk, Pretoria, Riga, Sofia, Tallinn, Vilnius
  3    => 'Moscow',#Baghdad, Kuwait, Nairobi, Riyadh, St. Petersburg, Volgograd
  3.5  => 'Tehran',
  4    => 'Baku',#Abu Dhabi, Muscat, Tbilisi, Yerevan
  4.5  => 'Kabul',
  5    => 'Karachi',#Ekaterinburg, Islamabad, Tashkent
  5.5  => 'Mumbai',#Chennai, Kolkata, New Delhi, Sri Jayawardenepura
  5.75 => 'Kathmandu',
  6    => 'Dhaka',#Almaty, Astana, Novosibirsk
  6.5  => 'Rangoon',
  7    => 'Jakarta',#Bangkok, Hanoi, Krasnoyarsk
  8    => 'Hong Kong',#Beijing, Chongqing, Irkutsk, Kuala Lumpur, Perth, Singapore, Taipei, Ulaan Bataar, Urumqi
  9    => 'Tokyo',#Osaka, Sapporo, Seoul, Yakutsk
  9.5  => 'Adelaide',#Darwin
  10   => 'Sydney',#Brisbane, Canberra, Guam, Hobart, Melbourne, Port Moresby, Vladivostok
  11   => 'Solomon Is.',#Kamchatka, Magadan, New Caledonia
  12   => 'Auckland',#Fiji, Marshall Is., Wellington
  13   => "Nuku'alofa",
}[utc_offset]