utc_offset is no longer required on TimeZone and if it's not supplied we delegate to TZInfo

activesupport/lib/active_support/values/time_zone.rb

@@ -194,7 +194,7 @@ module ActiveSupport
     # offset is the number of seconds that this time zone is offset from UTC
     # (GMT). Seconds were chosen as the offset unit because that is the unit that
     # Ruby uses to represent time zone offsets (see Time#utc_offset).
-    def initialize(name, utc_offset, tzinfo = nil)
+    def initialize(name, utc_offset = nil, tzinfo = nil)
       @name = name
       @utc_offset = utc_offset
       @tzinfo = tzinfo
@@ -202,8 +202,12 @@ module ActiveSupport
     end
 
     def utc_offset
-      @current_period ||= tzinfo.current_period
-      @current_period.utc_offset
+      if @utc_offset
+        @utc_offset
+      else
+        @current_period ||= tzinfo.current_period
+        @current_period.utc_offset
+      end
     end
 
     # Returns the offset of this time zone as a formatted string, of the
@@ -305,71 +309,24 @@ module ActiveSupport
       tzinfo.period_for_local(time, dst)
     end
 
-    # TODO: Preload instead of lazy load for thread safety
     def tzinfo
+      @tzinfo ||= find_tzinfo
+    end
+
+    # TODO: Preload instead of lazy load for thread safety
+    def find_tzinfo
       require 'tzinfo' unless defined?(::TZInfo)
-      @tzinfo ||= ::TZInfo::Timezone.get(MAPPING[name])
+      ::TZInfo::Timezone.get(MAPPING[name])
     end
 
     unless const_defined?(:ZONES)
       ZONES = []
       ZONES_MAP = {}
-      [[-39_600, "International Date Line West", "Midway Island", "Samoa" ],
-       [-36_000, "Hawaii" ],
-       [-32_400, "Alaska" ],
-       [-28_800, "Pacific Time (US & Canada)", "Tijuana" ],
-       [-25_200, "Mountain Time (US & Canada)", "Chihuahua", "Mazatlan",
-                 "Arizona" ],
-       [-21_600, "Central Time (US & Canada)", "Saskatchewan", "Guadalajara",
-                 "Mexico City", "Monterrey", "Central America" ],
-       [-18_000, "Eastern Time (US & Canada)", "Indiana (East)", "Bogota",
-                 "Lima", "Quito" ],
-       [-16_200, "Caracas" ],
-       [-14_400, "Atlantic Time (Canada)", "Georgetown", "La Paz", "Santiago" ],
-       [-12_600, "Newfoundland" ],
-       [-10_800, "Brasilia", "Buenos Aires", "Greenland" ],
-       [ -7_200, "Mid-Atlantic" ],
-       [ -3_600, "Azores", "Cape Verde Is." ],
-       [      0, "Dublin", "Edinburgh", "Lisbon", "London", "Casablanca",
-                 "Monrovia", "UTC" ],
-       [  3_600, "Belgrade", "Bratislava", "Budapest", "Ljubljana", "Prague",
-                 "Sarajevo", "Skopje", "Warsaw", "Zagreb", "Brussels",
-                 "Copenhagen", "Madrid", "Paris", "Amsterdam", "Berlin",
-                 "Bern", "Rome", "Stockholm", "Vienna",
-                 "West Central Africa" ],
-       [  7_200, "Bucharest", "Cairo", "Helsinki", "Kyiv", "Riga", "Sofia",
-                 "Tallinn", "Vilnius", "Athens", "Istanbul", "Minsk",
-                 "Jerusalem", "Harare", "Pretoria" ],
-       [ 10_800, "Moscow", "St. Petersburg", "Volgograd", "Kuwait", "Riyadh",
-                 "Nairobi", "Baghdad" ],
-       [ 12_600, "Tehran" ],
-       [ 14_400, "Abu Dhabi", "Muscat", "Baku", "Tbilisi", "Yerevan" ],
-       [ 16_200, "Kabul" ],
-       [ 18_000, "Ekaterinburg", "Islamabad", "Karachi", "Tashkent" ],
-       [ 19_800, "Chennai", "Kolkata", "Mumbai", "New Delhi", "Sri Jayawardenepura" ],
-       [ 20_700, "Kathmandu" ],
-       [ 21_600, "Astana", "Dhaka", "Almaty",
-                 "Novosibirsk" ],
-       [ 23_400, "Rangoon" ],
-       [ 25_200, "Bangkok", "Hanoi", "Jakarta", "Krasnoyarsk" ],
-       [ 28_800, "Beijing", "Chongqing", "Hong Kong", "Urumqi",
-                 "Kuala Lumpur", "Singapore", "Taipei", "Perth", "Irkutsk",
-                 "Ulaan Bataar" ],
-       [ 32_400, "Seoul", "Osaka", "Sapporo", "Tokyo", "Yakutsk" ],
-       [ 34_200, "Darwin", "Adelaide" ],
-       [ 36_000, "Canberra", "Melbourne", "Sydney", "Brisbane", "Hobart",
-                 "Vladivostok", "Guam", "Port Moresby" ],
-       [ 39_600, "Magadan", "Solomon Is.", "New Caledonia" ],
-       [ 43_200, "Fiji", "Kamchatka", "Marshall Is.", "Auckland",
-                 "Wellington" ],
-       [ 46_800, "Nuku'alofa" ]].
-      each do |offset, *places|
-        places.each do |place|
-          place.freeze
-          zone = new(place, offset)
-          ZONES << zone
-          ZONES_MAP[place] = zone
-        end
+      MAPPING.each_key do |place|
+        place.freeze
+        zone = new(place)
+        ZONES << zone
+        ZONES_MAP[place] = zone
       end
       ZONES.sort!
       ZONES.freeze