# File activesupport/lib/active_support/values/time_zone.rb, line 350
350:       def [](arg)
351:         case arg
352:           when String
353:           begin
354:             zones_map[arg] ||= lookup(arg).tap { |tz| tz.utc_offset }
355:           rescue TZInfo::InvalidTimezoneIdentifier
356:             nil
357:           end
358:           when Numeric, ActiveSupport::Duration
359:             arg *= 3600 if arg.abs <= 13
360:             all.find { |z| z.utc_offset == arg.to_i }
361:           else
362:             raise ArgumentError, "invalid argument to TimeZone[]: #{arg.inspect}"
363:         end
364:       end

       # File activesupport/lib/active_support/values/time_zone.rb, line 337
337:       def all
338:         @zones ||= zones_map.values.sort
339:       end

       # File activesupport/lib/active_support/values/time_zone.rb, line 319
319:     def self.find_tzinfo(name)
320:       require 'active_support/tzinfo' unless defined?(::TZInfo)
321:       ::TZInfo::TimezoneProxy.new(MAPPING[name] || name)
322:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 197
197:     def initialize(name, utc_offset = nil, tzinfo = nil)
198:       begin
199:         require 'tzinfo'
200:       rescue LoadError => e
201:         $stderr.puts "You don't have tzinfo installed in your application. Please add it to your Gemfile and run bundle install"
202:         raise e
203:       end
204:       @name = name
205:       @utc_offset = utc_offset
206:       @tzinfo = tzinfo || TimeZone.find_tzinfo(name)
207:       @current_period = nil
208:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 330
330:       def new(name)
331:         self[name]
332:       end

       # File activesupport/lib/active_support/values/time_zone.rb, line 181
181:     def self.seconds_to_utc_offset(seconds, colon = true)
182:       format = colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON
183:       sign = (seconds < 0 ? '-' : '+')
184:       hours = seconds.abs / 3600
185:       minutes = (seconds.abs % 3600) / 60
186:       format % [sign, hours, minutes]
187:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 368
368:       def us_zones
369:         @us_zones ||= all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ }
370:       end

       # File activesupport/lib/active_support/values/time_zone.rb, line 341
341:       def zones_map
342:         @zones_map ||= Hash[MAPPING.map { |place, _| [place, create(place)] }]
343:       end

       # File activesupport/lib/active_support/values/time_zone.rb, line 374
374:         def lookup(name)
375:           (tzinfo = find_tzinfo(name)) && create(tzinfo.name.freeze)
376:         end

       # File activesupport/lib/active_support/values/time_zone.rb, line 227
227:     def <=>(zone)
228:       result = (utc_offset <=> zone.utc_offset)
229:       result = (name <=> zone.name) if result == 0
230:       result
231:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 235
235:     def =~(re)
236:       return true if name =~ re || MAPPING[name] =~ re
237:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 258
258:     def at(secs)
259:       utc = Time.at(secs).utc rescue DateTime.civil(1970).since(secs)
260:       utc.in_time_zone(self)
261:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 221
221:     def formatted_offset(colon=true, alternate_utc_string = nil)
222:       utc_offset == 0 && alternate_utc_string || self.class.seconds_to_utc_offset(utc_offset, colon)
223:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 248
248:     def local(*args)
249:       time = Time.utc_time(*args)
250:       ActiveSupport::TimeWithZone.new(nil, self, time)
251:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 304
304:     def local_to_utc(time, dst=true)
305:       tzinfo.local_to_utc(time, dst)
306:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 288
288:     def now
289:       Time.now.utc.in_time_zone(self)
290:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 272
272:     def parse(str, now=now)
273:       date_parts = Date._parse(str)
274:       return if date_parts.blank?
275:       time = Time.parse(str, now) rescue DateTime.parse(str)
276:       if date_parts[:offset].nil?
277:         ActiveSupport::TimeWithZone.new(nil, self, time)
278:       else
279:         time.in_time_zone(self)
280:       end
281:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 314
314:     def period_for_local(time, dst=true)
315:       tzinfo.period_for_local(time, dst)
316:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 309
309:     def period_for_utc(time)
310:       tzinfo.period_for_utc(time)
311:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 240
240:     def to_s
241:       "(GMT#{formatted_offset}) #{name}"
242:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 293
293:     def today
294:       tzinfo.now.to_date
295:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 210
210:     def utc_offset
211:       if @utc_offset
212:         @utc_offset
213:       else
214:         @current_period ||= tzinfo.try(:current_period)
215:         @current_period.try(:utc_offset)
216:       end
217:     end

       # File activesupport/lib/active_support/values/time_zone.rb, line 299
299:     def utc_to_local(time)
300:       tzinfo.utc_to_local(time)
301:     end