класс ActiveSupport::TimeZone

# File activesupport/lib/active_support/values/time_zone.rb, line 395
def [](arg)
  case arg
    when String
    begin
      @lazy_zones_map[arg] ||= create(arg).tap { |tz| tz.utc_offset }
    rescue TZInfo::InvalidTimezoneIdentifier
      nil
    end
    when Numeric, ActiveSupport::Duration
      arg *= 3600 if arg.abs <= 13
      all.find { |z| z.utc_offset == arg.to_i }
    else
      raise ArgumentError, "invalid argument to TimeZone[]: #{arg.inspect}"
  end
end

# File activesupport/lib/active_support/values/time_zone.rb, line 379
def all
  @zones ||= zones_map.values.sort
end

# File activesupport/lib/active_support/values/time_zone.rb, line 362
def self.find_tzinfo(name)
  TZInfo::TimezoneProxy.new(MAPPING[name] || name)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 214
def initialize(name, utc_offset = nil, tzinfo = nil)
  @name = name
  @utc_offset = utc_offset
  @tzinfo = tzinfo || TimeZone.find_tzinfo(name)
  @current_period = nil
end

# File activesupport/lib/active_support/values/time_zone.rb, line 372
def new(name)
  self[name]
end

# File activesupport/lib/active_support/values/time_zone.rb, line 198
def self.seconds_to_utc_offset(seconds, colon = true)
  format = colon ? UTC_OFFSET_WITH_COLON : UTC_OFFSET_WITHOUT_COLON
  sign = (seconds < 0 ? '-' : '+')
  hours = seconds.abs / 3600
  minutes = (seconds.abs % 3600) / 60
  format % [sign, hours, minutes]
end

# File activesupport/lib/active_support/values/time_zone.rb, line 413
def us_zones
  @us_zones ||= all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ }
end

# File activesupport/lib/active_support/values/time_zone.rb, line 383
def zones_map
  @zones_map ||= begin
    MAPPING.each_key {|place| self[place]} # load all the zones
    @lazy_zones_map
  end
end

# File activesupport/lib/active_support/values/time_zone.rb, line 239
def <=>(zone)
  return unless zone.respond_to? :utc_offset
  result = (utc_offset <=> zone.utc_offset)
  result = (name <=> zone.name) if result == 0
  result
end

# File activesupport/lib/active_support/values/time_zone.rb, line 248
def =~(re)
  re === name || re === MAPPING[name]
end

# File activesupport/lib/active_support/values/time_zone.rb, line 273
def at(secs)
  Time.at(secs).utc.in_time_zone(self)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 233
def formatted_offset(colon=true, alternate_utc_string = nil)
  utc_offset == 0 && alternate_utc_string || self.class.seconds_to_utc_offset(utc_offset, colon)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 262
def local(*args)
  time = Time.utc(*args)
  ActiveSupport::TimeWithZone.new(nil, self, time)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 342
def local_to_utc(time, dst=true)
  tzinfo.local_to_utc(time, dst)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 314
def now
  time_now.utc.in_time_zone(self)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 288
def parse(str, now=now())
  parts = Date._parse(str, false)
  return if parts.empty?

  time = Time.new(
    parts.fetch(:year, now.year),
    parts.fetch(:mon, now.month),
    parts.fetch(:mday, now.day),
    parts.fetch(:hour, 0),
    parts.fetch(:min, 0),
    parts.fetch(:sec, 0) + parts.fetch(:sec_fraction, 0),
    parts.fetch(:offset, 0)
  )

  if parts[:offset]
    TimeWithZone.new(time.utc, self)
  else
    TimeWithZone.new(nil, self, time)
  end
end

# File activesupport/lib/active_support/values/time_zone.rb, line 354
def period_for_local(time, dst=true)
  tzinfo.period_for_local(time, dst)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 348
def period_for_utc(time)
  tzinfo.period_for_utc(time)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 253
def to_s
  "(GMT#{formatted_offset}) #{name}"
end

# File activesupport/lib/active_support/values/time_zone.rb, line 319
def today
  tzinfo.now.to_date
end

# File activesupport/lib/active_support/values/time_zone.rb, line 324
def tomorrow
  today + 1
end

# File activesupport/lib/active_support/values/time_zone.rb, line 222
def utc_offset
  if @utc_offset
    @utc_offset
  else
    @current_period ||= tzinfo.try(:current_period)
    @current_period.try(:utc_offset)
  end
end

# File activesupport/lib/active_support/values/time_zone.rb, line 336
def utc_to_local(time)
  tzinfo.utc_to_local(time)
end

# File activesupport/lib/active_support/values/time_zone.rb, line 329
def yesterday
  today - 1
end